diff options
Diffstat (limited to 'x11vnc/sslhelper.c')
| -rw-r--r-- | x11vnc/sslhelper.c | 4345 |
1 files changed, 0 insertions, 4345 deletions
diff --git a/x11vnc/sslhelper.c b/x11vnc/sslhelper.c deleted file mode 100644 index 7057615..0000000 --- a/x11vnc/sslhelper.c +++ /dev/null @@ -1,4345 +0,0 @@ -/* - Copyright (C) 2002-2010 Karl J. Runge <runge@karlrunge.com> - All rights reserved. - -This file is part of x11vnc. - -x11vnc is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 2 of the License, or (at -your option) any later version. - -x11vnc is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -GNU General Public License for more details. - -You should have received a copy of the GNU General Public License -along with x11vnc; if not, write to the Free Software -Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA -or see <http://www.gnu.org/licenses/>. - -In addition, as a special exception, Karl J. Runge -gives permission to link the code of its release of x11vnc with the -OpenSSL project's "OpenSSL" library (or with modified versions of it -that use the same license as the "OpenSSL" library), and distribute -the linked executables. You must obey the GNU General Public License -in all respects for all of the code used other than "OpenSSL". If you -modify this file, you may extend this exception to your version of the -file, but you are not obligated to do so. If you do not wish to do -so, delete this exception statement from your version. -*/ - -/* -- sslhelper.c -- */ - -#include "x11vnc.h" -#include "inet.h" -#include "cleanup.h" -#include "screen.h" -#include "scan.h" -#include "connections.h" -#include "sslcmds.h" -#include "unixpw.h" -#include "user.h" - -#define OPENSSL_INETD 1 -#define OPENSSL_VNC 2 -#define OPENSSL_VNC6 3 -#define OPENSSL_HTTPS 4 -#define OPENSSL_HTTPS6 5 -#define OPENSSL_REVERSE 6 - -#define DO_DH 0 - -#if LIBVNCSERVER_HAVE_FORK -#if LIBVNCSERVER_HAVE_SYS_WAIT_H && LIBVNCSERVER_HAVE_WAITPID -#define FORK_OK -#endif -#endif - -int openssl_sock = -1; -int openssl_sock6 = -1; -int openssl_port_num = 0; -int https_sock = -1; -int https_sock6 = -1; -pid_t openssl_last_helper_pid = 0; -char *openssl_last_ip = NULL; - -static char *certret = NULL; -static int certret_fd = -1; -static mode_t omode; -char *certret_str = NULL; - -static char *dhret = NULL; -static int dhret_fd = -1; -char *dhret_str = NULL; -char *new_dh_params = NULL; - -void raw_xfer(int csock, int s_in, int s_out); - -/* openssl(1) pem related functions: */ -char *get_saved_pem(char *string, int create); -char *find_openssl_bin(void); -char *get_ssl_verify_file(char *str_in); -char *create_tmp_pem(char *path, int prompt); - -static char *get_input(char *tag, char **in); - -char *get_saved_pem(char *save, int create) { - char *s = NULL, *path, *cdir, *tmp; - int prompt = 0, len; - struct stat sbuf; - - if (! save) { - rfbLog("get_saved_pem: save string is null.\n"); - clean_up_exit(1); - } - - if (strstr(save, "SAVE_PROMPT") == save) { - prompt = 1; - s = save + strlen("SAVE_PROMPT"); - } else if (strstr(save, "SAVE_NOPROMPT") == save) { - set_env("GENCERT_NOPROMPT", "1"); - s = save + strlen("SAVE_NOPROMPT"); - } else if (strstr(save, "SAVE") == save) { - s = save + strlen("SAVE"); - } else { - rfbLog("get_saved_pem: invalid save string: %s\n", save); - clean_up_exit(1); - } - if (strchr(s, '/')) { - rfbLog("get_saved_pem: invalid save string: %s\n", s); - clean_up_exit(1); - } - - - cdir = get_Cert_dir(NULL, &tmp); - if (! cdir || ! tmp) { - rfbLog("get_saved_pem: could not find Cert dir.\n"); - clean_up_exit(1); - } - - len = strlen(cdir) + strlen("/server.pem") + strlen(s) + 1; - - path = (char *) malloc(len); - sprintf(path, "%s/server%s.pem", cdir, s); - - if (stat(path, &sbuf) != 0) { - char *new_name = NULL; - if (create) { - if (inetd || opts_bg) { - set_env("GENCERT_NOPROMPT", "1"); - } - new_name = create_tmp_pem(path, prompt); - if (!getenv("X11VNC_SSL_NO_PASSPHRASE") && !inetd && !opts_bg) { - sslEncKey(new_name, 0); - } - } - return new_name; - } - - if (! quiet) { - char line[1024]; - int on = 0; - FILE *in = fopen(path, "r"); - if (in != NULL) { - rfbLog("\n"); - rfbLog("Using SSL Certificate:\n"); - fprintf(stderr, "\n"); - while (fgets(line, 1024, in) != NULL) { - if (strstr(line, "BEGIN CERTIFICATE")) { - on = 1; - } - if (on) { - fprintf(stderr, "%s", line); - } - if (strstr(line, "END CERTIFICATE")) { - on = 0; - } - if (strstr(line, "PRIVATE KEY")) { - on = 0; - } - } - fprintf(stderr, "\n"); - fclose(in); - } - } - return strdup(path); -} - -static char *get_input(char *tag, char **in) { - char line[1024], *str; - - if (! tag || ! in || ! *in) { - return NULL; - } - - fprintf(stderr, "%s:\n [%s] ", tag, *in); - if (fgets(line, 1024, stdin) == NULL) { - rfbLog("could not read stdin!\n"); - rfbLogPerror("fgets"); - clean_up_exit(1); - } - if ((str = strrchr(line, '\n')) != NULL) { - *str = '\0'; - } - str = lblanks(line); - if (!strcmp(str, "")) { - return *in; - } else { - return strdup(line); - } -} - -char *find_openssl_bin(void) { - char *path, *exe, *p, *gp; - struct stat sbuf; - int found_openssl = 0; - char extra[] = ":/usr/bin:/bin:/usr/sbin:/usr/local/bin" - ":/usr/local/sbin:/usr/sfw/bin"; - - gp = getenv("PATH"); - if (! gp) { - fprintf(stderr, "could not find openssl(1) program in PATH. (null)\n"); - return NULL; - } - - path = (char *) malloc(strlen(gp) + strlen(extra) + 1); - strcpy(path, gp); - strcat(path, extra); - - /* find openssl binary: */ - exe = (char *) malloc(strlen(path) + strlen("/openssl") + 1); - p = strtok(path, ":"); - - while (p) { - sprintf(exe, "%s/openssl", p); - if (stat(exe, &sbuf) == 0) { - if (! S_ISDIR(sbuf.st_mode)) { - found_openssl = 1; - break; - } - } - p = strtok(NULL, ":"); - } - free(path); - - if (! found_openssl) { - fprintf(stderr, "could not find openssl(1) program in PATH.\n"); - fprintf(stderr, "PATH=%s\n", gp); - fprintf(stderr, "(also checked: %s)\n", extra); - return NULL; - } - return exe; -} - -/* uses /usr/bin/openssl to create a tmp cert */ - -char *create_tmp_pem(char *pathin, int prompt) { - pid_t pid, pidw; - FILE *in, *out; - char cnf[] = "/tmp/x11vnc-cnf.XXXXXX"; - char pem[] = "/tmp/x11vnc-pem.XXXXXX"; - char str[8*1024], line[1024], *exe; - int cnf_fd, pem_fd, status, show_cert = 1; - char *days; - char *C, *L, *OU, *O, *CN, *EM; - char tmpl[] = -"[ req ]\n" -"prompt = no\n" -"default_bits = 2048\n" -"encrypt_key = yes\n" -"distinguished_name = req_dn\n" -"x509_extensions = cert_type\n" -"\n" -"[ req_dn ]\n" -"countryName=%s\n" -"localityName=%s\n" -"organizationalUnitName=%s\n" -"organizationName=%s\n" -"commonName=%s\n" -"emailAddress=%s\n" -"\n" -"[ cert_type ]\n" -"nsCertType = server\n" -; - - C = strdup("AU"); - L = strdup(UT.sysname ? UT.sysname : "unknown-os"); - snprintf(line, 1024, "%s-%f", UT.nodename ? UT.nodename : - "unknown-node", dnow()); - line[1024-1] = '\0'; - - OU = strdup(line); - O = strdup("x11vnc"); - if (pathin) { - snprintf(line, 1024, "x11vnc-SELF-SIGNED-CERT-%d", getpid()); - } else { - snprintf(line, 1024, "x11vnc-SELF-SIGNED-TEMPORARY-CERT-%d", - getpid()); - } - line[1024-1] = '\0'; - CN = strdup(line); - EM = strdup("x11vnc@server.nowhere"); - - /* ssl */ - if (no_external_cmds || !cmd_ok("ssl")) { - rfbLog("create_tmp_pem: cannot run external commands.\n"); - return NULL; - } - - rfbLog("\n"); - if (pathin) { - rfbLog("Creating a self-signed PEM certificate...\n"); - } else { - rfbLog("Creating a temporary, self-signed PEM certificate...\n"); - } - - rfbLog("\n"); - rfbLog("This will NOT prevent Man-In-The-Middle attacks UNLESS you\n"); - rfbLog("get the certificate information to the VNC viewers SSL\n"); - rfbLog("tunnel configuration or you take the extra steps to sign it\n"); - rfbLog("with a CA key. However, it will prevent passive network\n"); - rfbLog("sniffing.\n"); - rfbLog("\n"); - rfbLog("The cert inside -----BEGIN CERTIFICATE-----\n"); - rfbLog(" ....\n"); - rfbLog(" -----END CERTIFICATE-----\n"); - rfbLog("printed below may be used on the VNC viewer-side to\n"); - rfbLog("authenticate this server for this session. See the -ssl\n"); - rfbLog("help output and the FAQ for how to create a permanent\n"); - rfbLog("server certificate.\n"); - rfbLog("\n"); - - exe = find_openssl_bin(); - if (! exe) { - return NULL; - } - - /* create template file with our made up stuff: */ - if (prompt) { - fprintf(stderr, "\nReply to the following prompts to set" - " your Certificate parameters.\n"); - fprintf(stderr, "(press Enter to accept the default in [...], " - "or type in the value you want)\n\n"); - C = get_input("CountryName", &C); - L = get_input("LocalityName", &L); - OU = get_input("OrganizationalUnitName", &OU); - O = get_input("OrganizationalName", &O); - CN = get_input("CommonName", &CN); - EM = get_input("EmailAddress", &EM); - } - sprintf(str, tmpl, C, L, OU, O, CN, EM); - - cnf_fd = mkstemp(cnf); - if (cnf_fd < 0) { - return NULL; - } - pem_fd = mkstemp(pem); - if (pem_fd < 0) { - close(cnf_fd); - return NULL; - } - - close(pem_fd); - - write(cnf_fd, str, strlen(str)); - close(cnf_fd); - - if (pathin) { - days = "365"; - } else { - days = "30"; - } - -#ifndef FORK_OK - rfbLog("not compiled with fork(2)\n"); - clean_up_exit(1); -#else - /* make RSA key */ - pid = fork(); - if (pid < 0) { - return NULL; - } else if (pid == 0) { - int i; - for (i=0; i<256; i++) { - close(i); - } - execlp(exe, exe, "req", "-new", "-x509", "-nodes", - "-days", days, "-config", cnf, "-out", pem, - "-keyout", pem, (char *)0); - exit(1); - } - pidw = waitpid(pid, &status, 0); - if (pidw != pid) { - return NULL; - } - if (WIFEXITED(status) && WEXITSTATUS(status) == 0) { - ; - } else { - return NULL; - } - -#if DO_DH - /* make DH parameters */ - pid = fork(); - if (pid < 0) { - return NULL; - } else if (pid == 0) { - int i; - for (i=0; i<256; i++) { - close(i); - } - /* rather slow at 1024 */ - execlp(exe, exe, "dhparam", "-out", cnf, "512", (char *)0); - exit(1); - } - pidw = waitpid(pid, &status, 0); - if (pidw != pid) { - return NULL; - } - if (WIFEXITED(status) && WEXITSTATUS(status) == 0) { - ; - } else { - return NULL; - } - - /* append result: */ - in = fopen(cnf, "r"); - if (in == NULL) { - return NULL; - } - out = fopen(pem, "a"); - if (out == NULL) { - fclose(in); - return NULL; - } - while (fgets(line, 1024, in) != NULL) { - fprintf(out, "%s", line); - } - fclose(in); - fclose(out); -#endif - -#endif /* FORK_OK */ - - unlink(cnf); - free(exe); - - if (pathin != NULL) { - char *q, *pathcrt = strdup(pathin); - FILE *crt = NULL; - int on = 0; - - q = strrchr(pathcrt, '/'); - if (q) { - q = strstr(q, ".pem"); - if (q) { - *(q+1) = 'c'; - *(q+2) = 'r'; - *(q+3) = 't'; - crt = fopen(pathcrt, "w"); - } - } - if (crt == NULL) { - rfbLog("could not open: %s\n", pathcrt); - rfbLogPerror("fopen"); - return NULL; - } - - out = fopen(pathin, "w"); - chmod(pathin, 0600); - if (out == NULL) { - rfbLog("could not open: %s\n", pathin); - rfbLogPerror("fopen"); - fclose(crt); - return NULL; - } - - in = fopen(pem, "r"); - if (in == NULL) { - rfbLog("could not open: %s\n", pem); - rfbLogPerror("fopen"); - fclose(out); - fclose(crt); - unlink(pathin); - unlink(pathcrt); - return NULL; - } - while (fgets(line, 1024, in) != NULL) { - if (strstr(line, "BEGIN CERTIFICATE")) { - on = 1; - } - fprintf(out, "%s", line); - if (on) { - fprintf(crt, "%s", line); - if (!quiet) { - fprintf(stderr, "%s", line); - } - } - if (strstr(line, "END CERTIFICATE")) { - on = 0; - } - if (strstr(line, "PRIVATE KEY")) { - on = 0; - } - } - fclose(in); - fclose(out); - fclose(crt); - } - - if (show_cert) { - exe = find_openssl_bin(); - if (!exe) { - exe = strdup("openssl"); - } - if (strlen(pem) + strlen(exe) < 4000) { - char cmd[5000]; - if (inetd) { - sprintf(cmd, "%s x509 -text -in '%s' 1>&2", exe, pem); - } else { - sprintf(cmd, "%s x509 -text -in '%s'", exe, pem); - } - fprintf(stderr, "\n"); - system(cmd); - fprintf(stderr, "\n"); - } - free(exe); - } - - if (pathin) { - unlink(pem); - return strdup(pathin); - } else { - return strdup(pem); - } -} - -static int appendfile(FILE *out, char *infile) { - char line[1024]; - FILE *in; - - if (! infile) { - rfbLog("appendfile: null infile.\n"); - return 0; - } - if (! out) { - rfbLog("appendfile: null out handle.\n"); - return 0; - } - - in = fopen(infile, "r"); - - if (in == NULL) { - rfbLog("appendfile: %s\n", infile); - rfbLogPerror("fopen"); - return 0; - } - - while (fgets(line, 1024, in) != NULL) { - fprintf(out, "%s", line); - } - fclose(in); - return 1; -} - -char *get_ssl_verify_file(char *str_in) { - char *p, *str, *cdir, *tmp; - char *tfile, *tfile2; - FILE *file; - struct stat sbuf; - int count = 0, fd; - - if (! str_in) { - rfbLog("get_ssl_verify_file: no filename\n"); - exit(1); - } - - if (stat(str_in, &sbuf) == 0) { - /* assume he knows what he is doing. */ - return str_in; - } - - cdir = get_Cert_dir(NULL, &tmp); - if (! cdir || ! tmp) { - rfbLog("get_ssl_verify_file: invalid cert-dir.\n"); - exit(1); - } - - tfile = (char *) malloc(strlen(tmp) + 1024); - tfile2 = (char *) malloc(strlen(tmp) + 1024); - - sprintf(tfile, "%s/sslverify-tmp-load-%d.crts.XXXXXX", tmp, getpid()); - - fd = mkstemp(tfile); - if (fd < 0) { - rfbLog("get_ssl_verify_file: %s\n", tfile); - rfbLogPerror("mkstemp"); - exit(1); - } - close(fd); - - file = fopen(tfile, "w"); - chmod(tfile, 0600); - if (file == NULL) { - rfbLog("get_ssl_verify_file: %s\n", tfile); - rfbLogPerror("fopen"); - exit(1); - } - - str = strdup(str_in); - p = strtok(str, ","); - - while (p) { - if (!strcmp(p, "CA")) { - sprintf(tfile2, "%s/CA/cacert.pem", cdir); - if (! appendfile(file, tfile2)) { - unlink(tfile); - exit(1); - } - rfbLog("sslverify: loaded %s\n", tfile2); - count++; - - } else if (!strcmp(p, "clients")) { - DIR *dir; - struct dirent *dp; - - sprintf(tfile2, "%s/clients", cdir); - dir = opendir(tfile2); - if (! dir) { - rfbLog("get_ssl_verify_file: %s\n", tfile2); - rfbLogPerror("opendir"); - unlink(tfile); - exit(1); - } - while ( (dp = readdir(dir)) != NULL) { - char *n = dp->d_name; - char *q = strstr(n, ".crt"); - - if (! q || strlen(q) != strlen(".crt")) { - continue; - } - if (strlen(n) > 512) { - continue; - } - - sprintf(tfile2, "%s/clients/%s", cdir, n); - if (! appendfile(file, tfile2)) { - unlink(tfile); - exit(1); - } - rfbLog("sslverify: loaded %s\n", - tfile2); - count++; - } - closedir(dir); - - } else { - if (strlen(p) > 512) { - unlink(tfile); - exit(1); - } - sprintf(tfile2, "%s/clients/%s.crt", cdir, p); - if (stat(tfile2, &sbuf) != 0) { - sprintf(tfile2, "%s/clients/%s", cdir, p); - } - if (! appendfile(file, tfile2)) { - unlink(tfile); - exit(1); - } - rfbLog("sslverify: loaded %s\n", tfile2); - count++; - } - p = strtok(NULL, ","); - } - fclose(file); - free(tfile2); - free(str); - - rfbLog("sslverify: using %d client certs in\n", count); - rfbLog("sslverify: %s\n", tfile); - - return tfile; -} - -int openssl_present(void); -void openssl_init(int isclient); -void openssl_port(int restart); -void https_port(int restart); -void check_openssl(void); -void check_https(void); -void ssl_helper_pid(pid_t pid, int sock); -void accept_openssl(int mode, int presock); - -static void lose_ram(void); -#define ABSIZE 16384 - -static int vencrypt_selected = 0; -static int anontls_selected = 0; - -/* to test no openssl libssl */ -#if 0 -#undef LIBVNCSERVER_HAVE_LIBSSL -#define LIBVNCSERVER_HAVE_LIBSSL 0 -#endif - -#if !LIBVNCSERVER_HAVE_LIBSSL - -static void badnews(char *name) { - use_openssl = 0; - use_stunnel = 0; - rfbLog("** %s: not compiled with libssl OpenSSL support **\n", name ? name : "???"); - clean_up_exit(1); -} - -int openssl_present(void) {return 0;} -void openssl_init(int isclient) {badnews("openssl_init");} - -#define SSL_ERROR_NONE 0 - -static int ssl_init(int s_in, int s_out, int skip_vnc_tls, double last_https) { - if (enc_str != NULL) { - return 1; - } - badnews("ssl_init"); - return 0; -} - -static void ssl_xfer(int csock, int s_in, int s_out, int is_https) { - if (enc_str != NULL && !strcmp(enc_str, "none")) { - usleep(250*1000); - rfbLog("doing '-enc none' raw transfer (no encryption)\n"); - raw_xfer(csock, s_in, s_out); - } else { - badnews("ssl_xfer"); - } -} - -#else /* LIBVNCSERVER_HAVE_LIBSSL */ - -/* - * This is because on older systems both zlib.h and ssl.h define - * 'free_func' nothing we do below (currently) induces an external - * dependency on 'free_func'. - */ -#define free_func my_jolly_little_free_func - -#include <openssl/ssl.h> -#include <openssl/err.h> -#include <openssl/rand.h> - -static SSL_CTX *ctx = NULL; -static RSA *rsa_512 = NULL; -static RSA *rsa_1024 = NULL; -static SSL *ssl = NULL; -static X509_STORE *revocation_store = NULL; - - -static void init_prng(void); -static void sslerrexit(void); -static int ssl_init(int s_in, int s_out, int skip_vnc_tls, double last_https); -static void ssl_xfer(int csock, int s_in, int s_out, int is_https); - -#ifndef FORK_OK -void openssl_init(int isclient) { - rfbLog("openssl_init: fork is not supported. cannot create" - " ssl helper process.\n"); - clean_up_exit(1); -} -int openssl_present(void) {return 0;} - -#else - -int openssl_present(void) {return 1;} - -static void sslerrexit(void) { - unsigned long err = ERR_get_error(); - - if (err) { - char str[256]; - ERR_error_string(err, str); - fprintf(stderr, "ssl error: %s\n", str); - } - clean_up_exit(1); -} - -static int pem_passwd_callback(char *buf, int size, int rwflag, - void *userdata) { - char *q, line[1024]; - - if (! buf) { - exit(1); - } - - fprintf(stderr, "\nA passphrase is needed to unlock an OpenSSL " - "private key (PEM file).\n"); - fprintf(stderr, "Enter passphrase> "); - system("stty -echo"); - if(fgets(line, 1024, stdin) == NULL) { - fprintf(stdout, "\n"); - system("stty echo"); - exit(1); - } - system("stty echo"); - fprintf(stdout, "\n\n"); - q = strrchr(line, '\n'); - if (q) { - *q = '\0'; - } - line[1024 - 1] = '\0'; - strncpy(buf, line, size); - buf[size - 1] = '\0'; - - if (0) rwflag = 0; /* compiler warning. */ - if (0) userdata = 0; /* compiler warning. */ - - return strlen(buf); -} - -/* based on mod_ssl */ -static int crl_callback(X509_STORE_CTX *callback_ctx) { - X509_STORE_CTX store_ctx; - X509_OBJECT obj; - X509_NAME *subject; - X509_NAME *issuer; - X509 *xs; - X509_CRL *crl; - X509_REVOKED *revoked; - EVP_PKEY *pubkey; - long serial; - BIO *bio; - int i, n, rc; - char *cp, *cp2; - ASN1_TIME *t; - - /* Determine certificate ingredients in advance */ - xs = X509_STORE_CTX_get_current_cert(callback_ctx); - subject = X509_get_subject_name(xs); - issuer = X509_get_issuer_name(xs); - - /* Try to retrieve a CRL corresponding to the _subject_ of - * the current certificate in order to verify it's integrity. */ - memset((char *)&obj, 0, sizeof(obj)); - X509_STORE_CTX_init(&store_ctx, revocation_store, NULL, NULL); - rc=X509_STORE_get_by_subject(&store_ctx, X509_LU_CRL, subject, &obj); - X509_STORE_CTX_cleanup(&store_ctx); - crl=obj.data.crl; - - if(rc>0 && crl) { - /* Log information about CRL - * (A little bit complicated because of ASN.1 and BIOs...) */ - bio=BIO_new(BIO_s_mem()); - BIO_printf(bio, "lastUpdate: "); - ASN1_UTCTIME_print(bio, X509_CRL_get_lastUpdate(crl)); - BIO_printf(bio, ", nextUpdate: "); - ASN1_UTCTIME_print(bio, X509_CRL_get_nextUpdate(crl)); - n=BIO_pending(bio); - cp=malloc(n+1); - n=BIO_read(bio, cp, n); - cp[n]='\0'; - BIO_free(bio); - cp2=X509_NAME_oneline(subject, NULL, 0); - rfbLog("CA CRL: Issuer: %s, %s\n", cp2, cp); - OPENSSL_free(cp2); - free(cp); - - /* Verify the signature on this CRL */ - pubkey=X509_get_pubkey(xs); - if(X509_CRL_verify(crl, pubkey)<=0) { - rfbLog("Invalid signature on CRL\n"); - X509_STORE_CTX_set_error(callback_ctx, - X509_V_ERR_CRL_SIGNATURE_FAILURE); - X509_OBJECT_free_contents(&obj); - if(pubkey) - EVP_PKEY_free(pubkey); - return 0; /* Reject connection */ - } - if(pubkey) - EVP_PKEY_free(pubkey); - - /* Check date of CRL to make sure it's not expired */ - t=X509_CRL_get_nextUpdate(crl); - if(!t) { - rfbLog("Found CRL has invalid nextUpdate field\n"); - X509_STORE_CTX_set_error(callback_ctx, - X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD); - X509_OBJECT_free_contents(&obj); - return 0; /* Reject connection */ - } - if(X509_cmp_current_time(t)<0) { - rfbLog("Found CRL is expired - " - "revoking all certificates until you get updated CRL\n"); - X509_STORE_CTX_set_error(callback_ctx, X509_V_ERR_CRL_HAS_EXPIRED); - X509_OBJECT_free_contents(&obj); - return 0; /* Reject connection */ - } - X509_OBJECT_free_contents(&obj); - } - - /* Try to retrieve a CRL corresponding to the _issuer_ of - * the current certificate in order to check for revocation. */ - memset((char *)&obj, 0, sizeof(obj)); - X509_STORE_CTX_init(&store_ctx, revocation_store, NULL, NULL); - rc=X509_STORE_get_by_subject(&store_ctx, X509_LU_CRL, issuer, &obj); - X509_STORE_CTX_cleanup(&store_ctx); - crl=obj.data.crl; - - if(rc>0 && crl) { - /* Check if the current certificate is revoked by this CRL */ - n=sk_X509_REVOKED_num(X509_CRL_get_REVOKED(crl)); - for(i=0; i<n; i++) { - revoked=sk_X509_REVOKED_value(X509_CRL_get_REVOKED(crl), i); - if(ASN1_INTEGER_cmp(revoked->serialNumber, - X509_get_serialNumber(xs)) == 0) { - serial=ASN1_INTEGER_get(revoked->serialNumber); - cp=X509_NAME_oneline(issuer, NULL, 0); - rfbLog("Certificate with serial %ld (0x%lX) " - "revoked per CRL from issuer %s\n", serial, serial, cp); - OPENSSL_free(cp); - X509_STORE_CTX_set_error(callback_ctx, X509_V_ERR_CERT_REVOKED); - X509_OBJECT_free_contents(&obj); - return 0; /* Reject connection */ - } - } - X509_OBJECT_free_contents(&obj); - } - - return 1; /* Accept connection */ -} - -static int verify_callback(int ok, X509_STORE_CTX *callback_ctx) { - if (!ssl_verify) { - rfbLog("CRL_check: skipped.\n"); - return ok; - } - if (!ssl_crl) { - rfbLog("CRL_check: skipped.\n"); - return ok; - } - if (!ok) { - rfbLog("CRL_check: client cert is already rejected.\n"); - return ok; - } - if (revocation_store) { - if (crl_callback(callback_ctx)) { - rfbLog("CRL_check: succeeded.\n"); - return 1; - } else { - rfbLog("CRL_check: did not pass.\n"); - return 0; - } - } - /* NOTREACHED */ - return 1; -} - -#define rfbSecTypeAnonTls 18 -#define rfbSecTypeVencrypt 19 - -#define rfbVencryptPlain 256 -#define rfbVencryptTlsNone 257 -#define rfbVencryptTlsVnc 258 -#define rfbVencryptTlsPlain 259 -#define rfbVencryptX509None 260 -#define rfbVencryptX509Vnc 261 -#define rfbVencryptX509Plain 262 - -static int ssl_client_mode = 0; - -static int switch_to_anon_dh(void); - -void openssl_init(int isclient) { - int db = 0, tmp_pem = 0, do_dh; - FILE *in; - double ds; - long mode; - static int first = 1; - - do_dh = DO_DH; - - if (enc_str != NULL) { - if (first) { - init_prng(); - } - first = 0; - return; - } - - if (! quiet) { - rfbLog("\n"); - rfbLog("Initializing SSL (%s connect mode).\n", isclient ? "client":"server"); - } - if (first) { - if (db) fprintf(stderr, "\nSSL_load_error_strings()\n"); - - SSL_load_error_strings(); - - if (db) fprintf(stderr, "SSL_library_init()\n"); - - SSL_library_init(); - - if (db) fprintf(stderr, "init_prng()\n"); - - init_prng(); - - first = 0; - } - - if (isclient) { - ssl_client_mode = 1; - } else { - ssl_client_mode = 0; - } - - if (ssl_client_mode) { - if (db) fprintf(stderr, "SSLv23_client_method()\n"); - ctx = SSL_CTX_new( SSLv23_client_method() ); - } else { - if (db) fprintf(stderr, "SSLv23_server_method()\n"); - ctx = SSL_CTX_new( SSLv23_server_method() ); - } - - if (ctx == NULL) { - rfbLog("openssl_init: SSL_CTX_new failed.\n"); - sslerrexit(); - } - - ds = dnow(); - rsa_512 = RSA_generate_key(512, RSA_F4, NULL, NULL); - if (rsa_512 == NULL) { - rfbLog("openssl_init: RSA_generate_key(512) failed.\n"); - sslerrexit(); - } - - rfbLog("created 512 bit temporary RSA key: %.3fs\n", dnow() - ds); - - ds = dnow(); - rsa_1024 = RSA_generate_key(1024, RSA_F4, NULL, NULL); - if (rsa_1024 == NULL) { - rfbLog("openssl_init: RSA_generate_key(1024) failed.\n"); - sslerrexit(); - } - - rfbLog("created 1024 bit temporary RSA key: %.3fs\n", dnow() - ds); - - if (db) fprintf(stderr, "SSL_CTX_set_tmp_rsa()\n"); - - if (! SSL_CTX_set_tmp_rsa(ctx, rsa_1024)) { - rfbLog("openssl_init: SSL_CTX_set_tmp_rsa(1024) failed.\n"); - sslerrexit(); - } - - mode = 0; - mode |= SSL_MODE_ENABLE_PARTIAL_WRITE; - mode |= SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER; - SSL_CTX_set_mode(ctx, mode); - -#define ssl_cache 0 -#if ssl_cache - SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_BOTH); - SSL_CTX_set_timeout(ctx, 300); -#else - SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_OFF); - SSL_CTX_set_timeout(ctx, 1); -#endif - - ds = dnow(); - if (! openssl_pem) { - openssl_pem = create_tmp_pem(NULL, 0); - if (! openssl_pem) { - rfbLog("openssl_init: could not create temporary," - " self-signed PEM.\n"); - clean_up_exit(1); - } - tmp_pem = 1; - - } else if (!strcmp(openssl_pem, "ANON")) { - if (ssl_verify) { - rfbLog("openssl_init: Anonymous Diffie-Hellman cannot" - " be used in -sslverify mode.\n"); - clean_up_exit(1); - } - if (ssl_crl) { - rfbLog("openssl_init: Anonymous Diffie-Hellman cannot" - " be used in -sslCRL mode.\n"); - clean_up_exit(1); - } - /* n.b. new ctx */ - if (!switch_to_anon_dh()) { - rfbLog("openssl_init: Anonymous Diffie-Hellman setup" - " failed.\n"); - clean_up_exit(1); - } - } else if (strstr(openssl_pem, "SAVE") == openssl_pem) { - openssl_pem = get_saved_pem(openssl_pem, 1); - if (! openssl_pem) { - rfbLog("openssl_init: could not create or open" - " saved PEM: %s\n", openssl_pem); - clean_up_exit(1); - } - tmp_pem = 0; - } - - rfbLog("using PEM %s %.3fs\n", openssl_pem, dnow() - ds); - - SSL_CTX_set_default_passwd_cb(ctx, pem_passwd_callback); - - if (do_dh) { - DH *dh; - BIO *bio; - - ds = dnow(); - in = fopen(openssl_pem, "r"); - if (in == NULL) { - rfbLogPerror("fopen"); - clean_up_exit(1); - } - bio = BIO_new_fp(in, BIO_CLOSE|BIO_FP_TEXT); - if (! bio) { - rfbLog("openssl_init: BIO_new_fp() failed.\n"); - sslerrexit(); - } - dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL); - if (dh == NULL) { - rfbLog("openssl_init: PEM_read_bio_DHparams() failed.\n"); - BIO_free(bio); - sslerrexit(); - } - BIO_free(bio); - SSL_CTX_set_tmp_dh(ctx, dh); - rfbLog("loaded Diffie Hellman %d bits, %.3fs\n", - 8*DH_size(dh), dnow()-ds); - DH_free(dh); - } - - if (strcmp(openssl_pem, "ANON")) { - if (! SSL_CTX_use_certificate_chain_file(ctx, openssl_pem)) { - rfbLog("openssl_init: SSL_CTX_use_certificate_chain_file() failed.\n"); - sslerrexit(); - } - if (! SSL_CTX_use_RSAPrivateKey_file(ctx, openssl_pem, - SSL_FILETYPE_PEM)) { - rfbLog("openssl_init: SSL_CTX_set_tmp_rsa(1024) failed.\n"); - sslerrexit(); - } - if (! SSL_CTX_check_private_key(ctx)) { - rfbLog("openssl_init: SSL_CTX_set_tmp_rsa(1024) failed.\n"); - sslerrexit(); - } - } - - if (tmp_pem && ! getenv("X11VNC_KEEP_TMP_PEM")) { - if (getenv("X11VNC_SHOW_TMP_PEM")) { - FILE *in = fopen(openssl_pem, "r"); - if (in != NULL) { - char line[128]; - fprintf(stderr, "\n"); - while (fgets(line, 128, in) != NULL) { - fprintf(stderr, "%s", line); - } - fprintf(stderr, "\n"); - fclose(in); - } - } - unlink(openssl_pem); - free(openssl_pem); - openssl_pem = NULL; - } - - if (ssl_crl) { - struct stat sbuf; - X509_LOOKUP *lookup; - - if (stat(ssl_crl, &sbuf) != 0) { - rfbLog("openssl_init: -sslCRL does not exist %s.\n", - ssl_crl ? ssl_crl : "null"); - rfbLogPerror("stat"); - clean_up_exit(1); - } - - revocation_store = X509_STORE_new(); - if (!revocation_store) { - rfbLog("openssl_init: X509_STORE_new failed.\n"); - sslerrexit(); - } - if (! S_ISDIR(sbuf.st_mode)) { - lookup = X509_STORE_add_lookup(revocation_store, X509_LOOKUP_file()); - if (!lookup) { - rfbLog("openssl_init: X509_STORE_add_lookup failed.\n"); - sslerrexit(); - } - if (!X509_LOOKUP_load_file(lookup, ssl_crl, X509_FILETYPE_PEM)) { - rfbLog("openssl_init: X509_LOOKUP_load_file failed.\n"); - sslerrexit(); - } - } else { - lookup = X509_STORE_add_lookup(revocation_store, X509_LOOKUP_hash_dir()); - if (!lookup) { - rfbLog("openssl_init: X509_STORE_add_lookup failed.\n"); - sslerrexit(); - } - if (!X509_LOOKUP_add_dir(lookup, ssl_crl, X509_FILETYPE_PEM)) { - rfbLog("openssl_init: X509_LOOKUP_add_dir failed.\n"); - sslerrexit(); - } - } - rfbLog("loaded CRL file: %s\n", ssl_crl); - } - - if (ssl_verify) { - struct stat sbuf; - char *file; - int lvl; - - file = get_ssl_verify_file(ssl_verify); - - if (!file || stat(file, &sbuf) != 0) { - rfbLog("openssl_init: -sslverify does not exist %s.\n", - file ? file : "null"); - rfbLogPerror("stat"); - clean_up_exit(1); - } - if (! S_ISDIR(sbuf.st_mode)) { - if (! SSL_CTX_load_verify_locations(ctx, file, NULL)) { - rfbLog("openssl_init: SSL_CTX_load_verify_" - "locations() failed.\n"); - sslerrexit(); - } - } else { - if (! SSL_CTX_load_verify_locations(ctx, NULL, file)) { - rfbLog("openssl_init: SSL_CTX_load_verify_" - "locations() failed.\n"); - sslerrexit(); - } - } - - lvl = SSL_VERIFY_FAIL_IF_NO_PEER_CERT|SSL_VERIFY_PEER; - if (ssl_crl == NULL) { - SSL_CTX_set_verify(ctx, lvl, NULL); - } else { - SSL_CTX_set_verify(ctx, lvl, verify_callback); - } - if (strstr(file, "/sslverify-tmp-load-")) { - /* temporary file */ - unlink(file); - } - } else { - SSL_CTX_set_verify(ctx, SSL_VERIFY_NONE, NULL); - } - - rfbLog("\n"); -} - -static int read_exact(int sock, char *buf, int len) { - int n, fail = 0; - if (sock < 0) { - return 0; - } - while (len > 0) { - n = read(sock, buf, len); - if (n > 0) { - buf += n; - len -= n; - } else if (n == 0) { - fail = 1; - break; - } else if (n < 0 && (errno == EAGAIN || errno == EWOULDBLOCK)) { - usleep(10*1000); - } else if (n < 0 && errno != EINTR) { - fail = 1; - break; - } - } - if (fail) { - return 0; - } else { - return 1; - } -} - -static int write_exact(int sock, char *buf, int len) { - int n, fail = 0; - if (sock < 0) { - return 0; - } - while (len > 0) { - n = write(sock, buf, len); - if (n > 0) { - buf += n; - len -= n; - } else if (n == 0) { - fail = 1; - break; - } else if (n < 0 && (errno == EAGAIN || errno == EWOULDBLOCK)) { - usleep(10*1000); - } else if (n < 0 && errno != EINTR) { - fail = 1; - break; - } - } - if (fail) { - return 0; - } else { - return 1; - } -} - -/* XXX not in rfb.h: */ -void rfbClientSendString(rfbClientPtr cl, char *reason); - -static int finish_auth(rfbClientPtr client, char *type) { - int security_result, ret; - - ret = 0; - -if (getenv("X11VNC_DEBUG_TLSPLAIN")) fprintf(stderr, "finish_auth type=%s\n", type); - - if (!strcmp(type, "None")) { - security_result = 0; /* success */ - if (write_exact(client->sock, (char *) &security_result, 4)) { - ret = 1; - } - rfbLog("finish_auth: using auth 'None'\n"); - client->state = RFB_INITIALISATION; - - } else if (!strcmp(type, "Vnc")) { - RAND_bytes(client->authChallenge, CHALLENGESIZE); - if (write_exact(client->sock, (char *) &client->authChallenge, CHALLENGESIZE)) { - ret = 1; - } - rfbLog("finish_auth: using auth 'Vnc', sent challenge.\n"); - client->state = RFB_AUTHENTICATION; - - } else if (!strcmp(type, "Plain")) { - if (!unixpw) { - rfbLog("finish_auth: *Plain not allowed outside unixpw mode.\n"); - ret = 0; - } else { - char *un, *pw; - int unlen, pwlen; - -if (getenv("X11VNC_DEBUG_TLSPLAIN")) fprintf(stderr, "*Plain begin: onHold=%d client=%p unixpw_client=%p\n", client->onHold, (void *) client, (void *) unixpw_client); - - if (!read_exact(client->sock, (char *)&unlen, 4)) goto fail; - unlen = Swap32IfLE(unlen); - -if (getenv("X11VNC_DEBUG_TLSPLAIN")) fprintf(stderr, "unlen: %d\n", unlen); - - if (!read_exact(client->sock, (char *)&pwlen, 4)) goto fail; - pwlen = Swap32IfLE(pwlen); - -if (getenv("X11VNC_DEBUG_TLSPLAIN")) fprintf(stderr, "pwlen: %d\n", pwlen); - - un = (char *) malloc(unlen+1); - memset(un, 0, unlen+1); - - pw = (char *) malloc(pwlen+2); - memset(pw, 0, pwlen+2); - - if (!read_exact(client->sock, un, unlen)) goto fail; - if (!read_exact(client->sock, pw, pwlen)) goto fail; - -if (getenv("X11VNC_DEBUG_TLSPLAIN")) fprintf(stderr, "*Plain: %d %d '%s' ... \n", unlen, pwlen, un); - strcat(pw, "\n"); - - if (unixpw_verify(un, pw)) { - security_result = 0; /* success */ - if (write_exact(client->sock, (char *) &security_result, 4)) { - ret = 1; - unixpw_verify_screen(un, pw); - } - client->onHold = FALSE; - client->state = RFB_INITIALISATION; - } - if (ret == 0) { - rfbClientSendString(client, "unixpw failed"); - } - - memset(un, 0, unlen+1); - memset(pw, 0, pwlen+2); - free(un); - free(pw); - } - } else { - rfbLog("finish_auth: unknown sub-type: %s\n", type); - ret = 0; - } - - fail: - return ret; -} - -static int finish_vencrypt_auth(rfbClientPtr client, int subtype) { - - if (subtype == rfbVencryptTlsNone || subtype == rfbVencryptX509None) { - return finish_auth(client, "None"); - } else if (subtype == rfbVencryptTlsVnc || subtype == rfbVencryptX509Vnc) { - return finish_auth(client, "Vnc"); - } else if (subtype == rfbVencryptTlsPlain || subtype == rfbVencryptX509Plain) { - return finish_auth(client, "Plain"); - } else { - rfbLog("finish_vencrypt_auth: unknown sub-type: %d\n", subtype); - return 0; - } -} - - -static int add_anon_dh(void) { - pid_t pid, pidw; - char cnf[] = "/tmp/x11vnc-dh.XXXXXX"; - char *infile = NULL; - int status, cnf_fd; - DH *dh; - BIO *bio; - FILE *in; - double ds; - /* - * These are dh parameters (prime, generator), not dh keys. - * Evidently it is ok for them to be publicly known. - * openssl dhparam -out dh.out 1024 - */ - char *fixed_dh_params = -"-----BEGIN DH PARAMETERS-----\n" -"MIGHAoGBAL28w69ZnLYBvp8R2OeqtAIms+oatY19iBL4WhGI/7H1OMmkJjIe+OHs\n" -"PXoJfe5ucrnvno7Xm+HJZYa1jnPGQuWoa/VJKXdVjYdJVNzazJKM2daKKcQA4GDc\n" -"msFS5DxLbzUR5jy1n12K3EcbvpyFqDYVTJJXm7NuNuiWRfz3wTozAgEC\n" -"-----END DH PARAMETERS-----\n"; - - if (dhparams_file != NULL) { - infile = dhparams_file; - rfbLog("add_anon_dh: using %s\n", dhparams_file); - goto readin; - } - - cnf_fd = mkstemp(cnf); - if (cnf_fd < 0) { - return 0; - } - infile = cnf; - - if (create_fresh_dhparams) { - - if (new_dh_params != NULL) { - write(cnf_fd, new_dh_params, strlen(new_dh_params)); - close(cnf_fd); - } else { - char *exe = find_openssl_bin(); - struct stat sbuf; - - if (no_external_cmds || !cmd_ok("ssl")) { - rfbLog("add_anon_dh: cannot run external commands.\n"); - return 0; - } - - close(cnf_fd); - if (exe == NULL) { - return 0; - } - ds = dnow(); - pid = fork(); - if (pid < 0) { - return 0; - } else if (pid == 0) { - int i; - for (i=0; i<256; i++) { - if (i == 2) continue; - close(i); - } - /* rather slow at 1024 */ - execlp(exe, exe, "dhparam", "-out", cnf, "1024", (char *)0); - exit(1); - } - pidw = waitpid(pid, &status, 0); - if (pidw != pid) { - return 0; - } - if (WIFEXITED(status) && WEXITSTATUS(status) == 0) { - ; - } else { - return 0; - } - rfbLog("add_anon_dh: created new DH params in %.3f secs\n", dnow() - ds); - - if (stat(cnf, &sbuf) == 0 && sbuf.st_size > 0) { - /* save it to reuse during our process's lifetime: */ - int d = open(cnf, O_RDONLY); - if (d >= 0) { - int n, len = sbuf.st_size; - new_dh_params = (char *) calloc(len+1, 1); - n = read(d, new_dh_params, len); - close(d); - if (n != len) { - free(new_dh_params); - new_dh_params = NULL; - } else if (dhret != NULL) { - d = open(dhret, O_WRONLY); - if (d >= 0) { - write(d, new_dh_params, strlen(new_dh_params)); - close(d); - } - } - } - } - } - } else { - write(cnf_fd, fixed_dh_params, strlen(fixed_dh_params)); - close(cnf_fd); - } - - readin: - - ds = dnow(); - in = fopen(infile, "r"); - - if (in == NULL) { - rfbLogPerror("fopen"); - unlink(cnf); - return 0; - } - bio = BIO_new_fp(in, BIO_CLOSE|BIO_FP_TEXT); - if (! bio) { - rfbLog("openssl_init: BIO_new_fp() failed.\n"); - unlink(cnf); - return 0; - } - dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL); - if (dh == NULL) { - rfbLog("openssl_init: PEM_read_bio_DHparams() failed.\n"); - unlink(cnf); - BIO_free(bio); - return 0; - } - BIO_free(bio); - SSL_CTX_set_tmp_dh(ctx, dh); - rfbLog("loaded Diffie Hellman %d bits, %.3fs\n", 8*DH_size(dh), dnow()-ds); - DH_free(dh); - - unlink(cnf); - return 1; -} - -static int switch_to_anon_dh(void) { - long mode; - - rfbLog("Using Anonymous Diffie-Hellman mode.\n"); - rfbLog("WARNING: Anonymous Diffie-Hellman uses encryption but is\n"); - rfbLog("WARNING: susceptible to a Man-In-The-Middle attack.\n"); - if (ssl_client_mode) { - ctx = SSL_CTX_new( SSLv23_client_method() ); - } else { - ctx = SSL_CTX_new( SSLv23_server_method() ); - } - if (ctx == NULL) { - return 0; - } - if (ssl_client_mode) { - return 1; - } - if (!SSL_CTX_set_cipher_list(ctx, "ADH:@STRENGTH")) { - return 0; - } - if (!add_anon_dh()) { - return 0; - } - - mode = 0; - mode |= SSL_MODE_ENABLE_PARTIAL_WRITE; - mode |= SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER; - SSL_CTX_set_mode(ctx, mode); - - SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_BOTH); - SSL_CTX_set_timeout(ctx, 300); - SSL_CTX_set_default_passwd_cb(ctx, pem_passwd_callback); - SSL_CTX_set_verify(ctx, SSL_VERIFY_NONE, NULL); - - return 1; -} - -static int anontls_dialog(int s_in, int s_out) { - - if (s_in || s_out) {} - anontls_selected = 1; - - if (!switch_to_anon_dh()) { - rfbLog("anontls: Anonymous Diffie-Hellman failed.\n"); - return 0; - } - - /* continue with SSL/TLS */ - return 1; -} - -/* - * Using spec: - * http://www.mail-archive.com/qemu-devel@nongnu.org/msg08681.html - */ -static int vencrypt_dialog(int s_in, int s_out) { - char buf[256], buf2[256]; - int subtypes[16]; - int n, i, ival, ok, nsubtypes = 0; - - vencrypt_selected = 0; - - /* send version 0.2 */ - buf[0] = 0; - buf[1] = 2; - - if (!write_exact(s_out, buf, 2)) { - close(s_in); close(s_out); - return 0; - } - - /* read client version 0.2 */ - memset(buf, 0, sizeof(buf)); - if (!read_exact(s_in, buf, 2)) { - close(s_in); close(s_out); - return 0; - } - rfbLog("vencrypt: received %d.%d client version.\n", (int) buf[0], (int) buf[1]); - - /* close 0.0 */ - if (buf[0] == 0 && buf[1] == 0) { - rfbLog("vencrypt: received 0.0 version, closing connection.\n"); - close(s_in); close(s_out); - return 0; - } - - /* accept only 0.2 */ - if (buf[0] != 0 || buf[1] != 2) { - rfbLog("vencrypt: unsupported VeNCrypt version, closing connection.\n"); - buf[0] = (char) 255; - write_exact(s_out, buf, 1); - close(s_in); close(s_out); - return 0; - } - - /* tell them OK */ - buf[0] = 0; - if (!write_exact(s_out, buf, 1)) { - close(s_in); close(s_out); - return 0; - } - - if (getenv("X11VNC_ENABLE_VENCRYPT_PLAIN_LOGIN")) { - vencrypt_enable_plain_login = atoi(getenv("X11VNC_ENABLE_VENCRYPT_PLAIN_LOGIN")); - } - - /* load our list of sub-types: */ - n = 0; - if (!ssl_verify && vencrypt_kx != VENCRYPT_NODH) { - if (screen->authPasswdData != NULL) { - subtypes[n++] = rfbVencryptTlsVnc; - } else { - if (vencrypt_enable_plain_login && unixpw) { - subtypes[n++] = rfbVencryptTlsPlain; - } else { - subtypes[n++] = rfbVencryptTlsNone; - } - } - } - if (vencrypt_kx != VENCRYPT_NOX509) { - if (screen->authPasswdData != NULL) { - subtypes[n++] = rfbVencryptX509Vnc; - } else { - if (vencrypt_enable_plain_login && unixpw) { - subtypes[n++] = rfbVencryptX509Plain; - } else { - subtypes[n++] = rfbVencryptX509None; - } - } - } - - nsubtypes = n; - for (i = 0; i < nsubtypes; i++) { - ((uint32_t *)buf)[i] = Swap32IfLE(subtypes[i]); - } - - /* send number first: */ - buf2[0] = (char) nsubtypes; - if (!write_exact(s_out, buf2, 1)) { - close(s_in); close(s_out); - return 0; - } - /* and now the list: */ - if (!write_exact(s_out, buf, 4*n)) { - close(s_in); close(s_out); - return 0; - } - - /* read client's selection: */ - if (!read_exact(s_in, (char *)&ival, 4)) { - close(s_in); close(s_out); - return 0; - } - ival = Swap32IfLE(ival); - - /* zero means no dice: */ - if (ival == 0) { - rfbLog("vencrypt: client selected no sub-type, closing connection.\n"); - close(s_in); close(s_out); - return 0; - } - - /* check if he selected a valid one: */ - ok = 0; - for (i = 0; i < nsubtypes; i++) { - if (ival == subtypes[i]) { - ok = 1; - } - } - - if (!ok) { - rfbLog("vencrypt: client selected invalid sub-type: %d\n", ival); - close(s_in); close(s_out); - return 0; - } else { - char *st = "unknown!!"; - if (ival == rfbVencryptTlsNone) st = "rfbVencryptTlsNone"; - if (ival == rfbVencryptTlsVnc) st = "rfbVencryptTlsVnc"; - if (ival == rfbVencryptTlsPlain) st = "rfbVencryptTlsPlain"; - if (ival == rfbVencryptX509None) st = "rfbVencryptX509None"; - if (ival == rfbVencryptX509Vnc) st = "rfbVencryptX509Vnc"; - if (ival == rfbVencryptX509Plain) st = "rfbVencryptX509Plain"; - rfbLog("vencrypt: client selected sub-type: %d (%s)\n", ival, st); - } - - vencrypt_selected = ival; - - /* not documented in spec, send OK: */ - buf[0] = 1; - if (!write_exact(s_out, buf, 1)) { - close(s_in); close(s_out); - return 0; - } - - if (vencrypt_selected == rfbVencryptTlsNone || - vencrypt_selected == rfbVencryptTlsVnc || - vencrypt_selected == rfbVencryptTlsPlain) { - /* these modes are Anonymous Diffie-Hellman */ - if (!switch_to_anon_dh()) { - rfbLog("vencrypt: Anonymous Diffie-Hellman failed.\n"); - return 0; - } - } - - /* continue with SSL/TLS */ - return 1; -} - -static int check_vnc_tls_mode(int s_in, int s_out, double last_https) { - double waited = 0.0, waitmax = 1.4, dt = 0.01, start = dnow(); - struct timeval tv; - int input = 0, i, n, ok; - int major, minor, sectype = -1; - char *proto = "RFB 003.008\n"; - char *stype = "unknown"; - char buf[256]; - - vencrypt_selected = 0; - anontls_selected = 0; - - if (vencrypt_mode == VENCRYPT_NONE && anontls_mode == ANONTLS_NONE) { - /* only normal SSL */ - return 1; - } - if (ssl_client_mode) { - if (vencrypt_mode == VENCRYPT_FORCE || anontls_mode == ANONTLS_FORCE) { - rfbLog("check_vnc_tls_mode: VENCRYPT_FORCE/ANONTLS_FORCE in client\n"); - rfbLog("check_vnc_tls_mode: connect mode.\n"); - /* this is OK, continue on below for dialog. */ - } else { - /* otherwise we must assume normal SSL (we send client hello) */ - return 1; - } - } - if (ssl_verify && vencrypt_mode != VENCRYPT_FORCE && anontls_mode == ANONTLS_FORCE) { - rfbLog("check_vnc_tls_mode: Cannot use ANONTLS_FORCE with -sslverify (Anon DH only)\n"); - /* fallback to normal SSL */ - return 1; - } - - if (last_https > 0.0) { - double now = dnow(); - if (now < last_https + 5.0) { - waitmax = 20.0; - } else if (now < last_https + 15.0) { - waitmax = 10.0; - } else if (now < last_https + 30.0) { - waitmax = 5.0; - } else if (now < last_https + 60.0) { - waitmax = 2.5; - } - } - - while (waited < waitmax) { - fd_set rfds; - FD_ZERO(&rfds); - FD_SET(s_in, &rfds); - tv.tv_sec = 0; - tv.tv_usec = 0; - select(s_in+1, &rfds, NULL, NULL, &tv); - if (FD_ISSET(s_in, &rfds)) { - input = 1; - break; - } - usleep((int) (1000 * 1000 * dt)); - waited += dt; - } - rfbLog("check_vnc_tls_mode: waited: %f / %.2f input: %s\n", - dnow() - start, waitmax, input ? "SSL Handshake" : "(future) RFB Handshake"); - - if (input) { - /* got SSL client hello, can only assume normal SSL */ - if (vencrypt_mode == VENCRYPT_FORCE || anontls_mode == ANONTLS_FORCE) { - rfbLog("check_vnc_tls_mode: VENCRYPT_FORCE/ANONTLS_FORCE prevents normal SSL\n"); - return 0; - } - return 1; - } - - /* send RFB 003.008 -- there is no turning back from this point... */ - if (!write_exact(s_out, proto, strlen(proto))) { - close(s_in); close(s_out); - return 0; - } - - memset(buf, 0, sizeof(buf)); - if (!read_exact(s_in, buf, 12)) { - close(s_in); close(s_out); - return 0; - } - - if (sscanf(buf, "RFB %03d.%03d\n", &major, &minor) != 2) { - int i; - rfbLog("check_vnc_tls_mode: abnormal handshake: '%s'\nbytes: ", buf); - for (i=0; i < 12; i++) { - fprintf(stderr, "%d.", (unsigned char) buf[i]); - } - fprintf(stderr, "\n"); - close(s_in); close(s_out); - return 0; - } - rfbLog("check_vnc_tls_mode: version: %d.%d\n", major, minor); - if (major != 3 || minor < 8) { - rfbLog("check_vnc_tls_mode: invalid version: '%s'\n", buf); - close(s_in); close(s_out); - return 0; - } - - n = 1; - if (vencrypt_mode == VENCRYPT_FORCE) { - buf[n++] = rfbSecTypeVencrypt; - } else if (anontls_mode == ANONTLS_FORCE && !ssl_verify) { - buf[n++] = rfbSecTypeAnonTls; - } else if (vencrypt_mode == VENCRYPT_SOLE) { - buf[n++] = rfbSecTypeVencrypt; - } else if (anontls_mode == ANONTLS_SOLE && !ssl_verify) { - buf[n++] = rfbSecTypeAnonTls; - } else { - if (vencrypt_mode == VENCRYPT_SUPPORT) { - buf[n++] = rfbSecTypeVencrypt; - } - if (anontls_mode == ANONTLS_SUPPORT && !ssl_verify) { - buf[n++] = rfbSecTypeAnonTls; - } - } - - n--; - buf[0] = (char) n; - if (!write_exact(s_out, buf, n+1)) { - close(s_in); close(s_out); - return 0; - } - if (0) fprintf(stderr, "wrote[%d] %d %d %d\n", n, buf[0], buf[1], buf[2]); - - buf[0] = 0; - if (!read_exact(s_in, buf, 1)) { - close(s_in); close(s_out); - return 0; - } - - if (buf[0] == rfbSecTypeVencrypt) stype = "VeNCrypt"; - if (buf[0] == rfbSecTypeAnonTls) stype = "ANONTLS"; - - rfbLog("check_vnc_tls_mode: reply: %d (%s)\n", (int) buf[0], stype); - - ok = 0; - for (i=1; i < n+1; i++) { - if (buf[0] == buf[i]) { - ok = 1; - } - } - if (!ok) { - char *msg = "check_vnc_tls_mode: invalid security-type"; - int len = strlen(msg); - rfbLog("%s: %d\n", msg, (int) buf[0]); - ((uint32_t *)buf)[0] = Swap32IfLE(len); - write_exact(s_out, buf, 4); - write_exact(s_out, msg, strlen(msg)); - close(s_in); close(s_out); - return 0; - } - - sectype = (int) buf[0]; - - if (sectype == rfbSecTypeVencrypt) { - return vencrypt_dialog(s_in, s_out); - } else if (sectype == rfbSecTypeAnonTls) { - return anontls_dialog(s_in, s_out); - } else { - return 0; - } -} - -static void pr_ssl_info(int verb) { - SSL_CIPHER *c; - SSL_SESSION *s; - char *proto = "unknown"; - - if (verb) {} - - if (ssl == NULL) { - return; - } - c = SSL_get_current_cipher(ssl); - s = SSL_get_session(ssl); - - if (s == NULL) { - proto = "nosession"; - } else if (s->ssl_version == SSL2_VERSION) { - proto = "SSLv2"; - } else if (s->ssl_version == SSL3_VERSION) { - proto = "SSLv3"; - } else if (s->ssl_version == TLS1_VERSION) { - proto = "TLSv1"; - } - if (c != NULL) { - rfbLog("SSL: ssl_helper[%d]: Cipher: %s %s Proto: %s\n", getpid(), - SSL_CIPHER_get_version(c), SSL_CIPHER_get_name(c), proto); - } else { - rfbLog("SSL: ssl_helper[%d]: Proto: %s\n", getpid(), - proto); - } -} - -static void ssl_timeout (int sig) { - int i; - rfbLog("sig: %d, ssl_init[%d] timed out.\n", sig, getpid()); - rfbLog("To increase the SSL initialization timeout use, e.g.:\n"); - rfbLog(" -env SSL_INIT_TIMEOUT=120 (for 120 seconds)\n"); - for (i=0; i < 256; i++) { - close(i); - } - exit(1); -} - -static int ssl_init(int s_in, int s_out, int skip_vnc_tls, double last_https) { - unsigned char *sid = (unsigned char *) "x11vnc SID"; - char *name = NULL; - int peerport = 0; - int db = 0, rc, err; - int ssock = s_in; - double start = dnow(); - int timeout = 20; - - if (enc_str != NULL) { - return 1; - } - if (getenv("SSL_DEBUG")) { - db = atoi(getenv("SSL_DEBUG")); - } - usleep(100 * 1000); - if (getenv("SSL_INIT_TIMEOUT")) { - timeout = atoi(getenv("SSL_INIT_TIMEOUT")); - } else if (client_connect != NULL && strstr(client_connect, "repeater")) { - rfbLog("SSL: ssl_init[%d]: detected 'repeater' in connect string.\n", getpid()); - rfbLog("SSL: setting timeout to 1 hour: -env SSL_INIT_TIMEOUT=3600\n"); - rfbLog("SSL: use that option to set a different timeout value,\n"); - rfbLog("SSL: however note that with Windows UltraVNC repeater it\n"); - rfbLog("SSL: may timeout before your setting due to other reasons.\n"); - timeout = 3600; - } - - if (skip_vnc_tls) { - rfbLog("SSL: ssl_helper[%d]: HTTPS mode, skipping check_vnc_tls_mode()\n", - getpid()); - } else if (!check_vnc_tls_mode(s_in, s_out, last_https)) { - return 0; - } - rfbLog("SSL: ssl_init[%d]: %d/%d initialization timeout: %d secs.\n", - getpid(), s_in, s_out, timeout); - - ssl = SSL_new(ctx); - if (ssl == NULL) { - fprintf(stderr, "SSL_new failed\n"); - return 0; - } - if (db > 1) fprintf(stderr, "ssl_init: 1\n"); - - SSL_set_session_id_context(ssl, sid, strlen((char *)sid)); - - if (s_in == s_out) { - if (! SSL_set_fd(ssl, ssock)) { - fprintf(stderr, "SSL_set_fd failed\n"); - return 0; - } - } else { - if (! SSL_set_rfd(ssl, s_in)) { - fprintf(stderr, "SSL_set_rfd failed\n"); - return 0; - } - if (! SSL_set_wfd(ssl, s_out)) { - fprintf(stderr, "SSL_set_wfd failed\n"); - return 0; - } - } - if (db > 1) fprintf(stderr, "ssl_init: 2\n"); - - if (ssl_client_mode) { - SSL_set_connect_state(ssl); - } else { - SSL_set_accept_state(ssl); - } - - if (db > 1) fprintf(stderr, "ssl_init: 3\n"); - - name = get_remote_host(ssock); - peerport = get_remote_port(ssock); - - if (!strcmp(name, "0.0.0.0") && openssl_last_ip != NULL) { - name = strdup(openssl_last_ip); - } - - if (db > 1) fprintf(stderr, "ssl_init: 4\n"); - - while (1) { - - signal(SIGALRM, ssl_timeout); - alarm(timeout); - - if (ssl_client_mode) { - if (db) fprintf(stderr, "calling SSL_connect...\n"); - rc = SSL_connect(ssl); - } else { - if (db) fprintf(stderr, "calling SSL_accept...\n"); - rc = SSL_accept(ssl); - } - err = SSL_get_error(ssl, rc); - - alarm(0); - signal(SIGALRM, SIG_DFL); - - if (ssl_client_mode) { - if (db) fprintf(stderr, "SSL_connect %d/%d\n", rc, err); - } else { - if (db) fprintf(stderr, "SSL_accept %d/%d\n", rc, err); - } - if (err == SSL_ERROR_NONE) { - break; - } else if (err == SSL_ERROR_WANT_READ) { - - if (db) fprintf(stderr, "got SSL_ERROR_WANT_READ\n"); - rfbLog("SSL: ssl_helper[%d]: %s() failed for: %s:%d 1\n", - getpid(), ssl_client_mode ? "SSL_connect" : "SSL_accept", name, peerport); - pr_ssl_info(1); - return 0; - - } else if (err == SSL_ERROR_WANT_WRITE) { - - if (db) fprintf(stderr, "got SSL_ERROR_WANT_WRITE\n"); - rfbLog("SSL: ssl_helper[%d]: %s() failed for: %s:%d 2\n", - getpid(), ssl_client_mode ? "SSL_connect" : "SSL_accept", name, peerport); - pr_ssl_info(1); - return 0; - - } else if (err == SSL_ERROR_SYSCALL) { - - if (db) fprintf(stderr, "got SSL_ERROR_SYSCALL\n"); - rfbLog("SSL: ssl_helper[%d]: %s() failed for: %s:%d 3\n", - getpid(), ssl_client_mode ? "SSL_connect" : "SSL_accept", name, peerport); - pr_ssl_info(1); - return 0; - - } else if (err == SSL_ERROR_ZERO_RETURN) { - - if (db) fprintf(stderr, "got SSL_ERROR_ZERO_RETURN\n"); - rfbLog("SSL: ssl_helper[%d]: %s() failed for: %s:%d 4\n", - getpid(), ssl_client_mode ? "SSL_connect" : "SSL_accept", name, peerport); - pr_ssl_info(1); - return 0; - - } else if (rc < 0) { - unsigned long err; - int cnt = 0; - - rfbLog("SSL: ssl_helper[%d]: %s() *FATAL: %d SSL FAILED\n", - getpid(), ssl_client_mode ? "SSL_connect" : "SSL_accept", rc); - while ((err = ERR_get_error()) != 0) { - rfbLog("SSL: %s\n", ERR_error_string(err, NULL)); - if (cnt++ > 100) { - break; - } - } - pr_ssl_info(1); - return 0; - - } else if (dnow() > start + 3.0) { - - rfbLog("SSL: ssl_helper[%d]: timeout looping %s() " - "fatal.\n", getpid(), ssl_client_mode ? "SSL_connect" : "SSL_accept"); - pr_ssl_info(1); - return 0; - - } else { - BIO *bio = SSL_get_rbio(ssl); - if (bio == NULL) { - rfbLog("SSL: ssl_helper[%d]: ssl BIO is null. " - "fatal.\n", getpid()); - pr_ssl_info(1); - return 0; - } - if (BIO_eof(bio)) { - rfbLog("SSL: ssl_helper[%d]: ssl BIO is EOF. " - "fatal.\n", getpid()); - pr_ssl_info(1); - return 0; - } - } - usleep(10 * 1000); - } - - if (ssl_client_mode) { - rfbLog("SSL: ssl_helper[%d]: SSL_connect() succeeded for: %s:%d\n", getpid(), name, peerport); - } else { - rfbLog("SSL: ssl_helper[%d]: SSL_accept() succeeded for: %s:%d\n", getpid(), name, peerport); - } - - pr_ssl_info(0); - - if (SSL_get_verify_result(ssl) == X509_V_OK) { - X509 *x; - FILE *cr = NULL; - if (certret != NULL) { - cr = fopen(certret, "w"); - } - - x = SSL_get_peer_certificate(ssl); - if (x == NULL) { - rfbLog("SSL: ssl_helper[%d]: accepted client %s x509 peer cert is null\n", getpid(), name); - if (cr != NULL) { - fprintf(cr, "NOCERT\n"); - fclose(cr); - } - } else { - rfbLog("SSL: ssl_helper[%d]: accepted client %s x509 cert is:\n", getpid(), name); -#if LIBVNCSERVER_HAVE_X509_PRINT_EX_FP - X509_print_ex_fp(stderr, x, 0, XN_FLAG_MULTILINE); -#endif - if (cr != NULL) { -#if LIBVNCSERVER_HAVE_X509_PRINT_EX_FP - X509_print_ex_fp(cr, x, 0, XN_FLAG_MULTILINE); -#else - rfbLog("** not compiled with libssl X509_print_ex_fp() function **\n"); - if (users_list && strstr(users_list, "sslpeer=")) { - rfbLog("** -users sslpeer= will not work! **\n"); - } -#endif - fclose(cr); - } - } - } - free(name); - - return 1; -} - -static void symmetric_encryption_xfer(int csock, int s_in, int s_out); - -static void ssl_xfer(int csock, int s_in, int s_out, int is_https) { - int dbxfer = 0, db = 0, check_pending, fdmax, nfd, n, i, err; - char cbuf[ABSIZE], sbuf[ABSIZE]; - int cptr, sptr, c_rd, c_wr, s_rd, s_wr; - fd_set rd, wr; - struct timeval tv; - int ssock, cnt = 0, ndata = 0; - - /* - * we want to switch to a longer timeout for long term VNC - * connections (in case the network is not working for periods of - * time), but we also want the timeout shorter at the beginning - * in case the client went away. - */ - double start, now; - int tv_https_early = 60; - int tv_https_later = 20; - int tv_vnc_early = 40; - int tv_vnc_later = 43200; /* was 300, stunnel: 43200 */ - int tv_cutover = 70; - int tv_closing = 60; - int tv_use; - - if (dbxfer) { - raw_xfer(csock, s_in, s_out); - return; - } - if (enc_str != NULL) { - if (!strcmp(enc_str, "none")) { - usleep(250*1000); - rfbLog("doing '-enc none' raw transfer (no encryption)\n"); - raw_xfer(csock, s_in, s_out); - } else { - symmetric_encryption_xfer(csock, s_in, s_out); - } - return; - } - - if (getenv("SSL_DEBUG")) { - db = atoi(getenv("SSL_DEBUG")); - } - - if (db) fprintf(stderr, "ssl_xfer begin\n"); - - start = dnow(); - if (is_https) { - tv_use = tv_https_early; - } else { - tv_use = tv_vnc_early; - } - - - /* - * csock: clear text socket with libvncserver. "C" - * ssock: ssl data socket with remote vnc viewer. "S" - * - * to cover inetd mode, we have s_in and s_out, but in non-inetd - * mode they both ssock. - * - * cbuf[] is data from csock that we have read but not passed on to ssl - * sbuf[] is data from ssl that we have read but not passed on to csock - */ - for (i=0; i<ABSIZE; i++) { - cbuf[i] = '\0'; - sbuf[i] = '\0'; - } - - if (s_out > s_in) { - ssock = s_out; - } else { - ssock = s_in; - } - - if (csock > ssock) { - fdmax = csock; - } else { - fdmax = ssock; - } - - c_rd = 1; /* clear text (libvncserver) socket open for reading */ - c_wr = 1; /* clear text (libvncserver) socket open for writing */ - s_rd = 1; /* ssl data (remote client) socket open for reading */ - s_wr = 1; /* ssl data (remote client) socket open for writing */ - - cptr = 0; /* offsets into ABSIZE buffers */ - sptr = 0; - - if (vencrypt_selected > 0 || anontls_selected > 0) { - char tmp[16]; - /* read and discard the extra RFB version */ - memset(tmp, 0, sizeof(tmp)); - read(csock, tmp, 12); - if (0) fprintf(stderr, "extra: %s\n", tmp); - } - - while (1) { - int c_to_s, s_to_c, closing; - - if ( s_wr && (c_rd || cptr > 0) ) { - /* - * S is writable and - * C is readable or some cbuf data remaining - */ - c_to_s = 1; - } else { - c_to_s = 0; - } - - if ( c_wr && (s_rd || sptr > 0) ) { - /* - * C is writable and - * S is readable or some sbuf data remaining - */ - s_to_c = 1; - } else { - s_to_c = 0; - } - - if (! c_to_s && ! s_to_c) { - /* - * nothing can be sent either direction. - * break out of the loop to finish all work. - */ - break; - } - cnt++; - - /* set up the fd sets for the two sockets for read & write: */ - - FD_ZERO(&rd); - - if (c_rd && cptr < ABSIZE) { - /* we could read more from C since cbuf is not full */ - FD_SET(csock, &rd); - } - if (s_rd) { - /* - * we could read more from S since sbuf not full, - * OR ssl is waiting for more BIO to be able to - * read and we have some C data still buffered. - */ - if (sptr < ABSIZE || (cptr > 0 && SSL_want_read(ssl))) { - FD_SET(s_in, &rd); - } - } - - FD_ZERO(&wr); - - if (c_wr && sptr > 0) { - /* we could write more to C since sbuf is not empty */ - FD_SET(csock, &wr); - } - if (s_wr) { - /* - * we could write more to S since cbuf not empty, - * OR ssl is waiting for more BIO to be able - * write and we haven't filled up sbuf yet. - */ - if (cptr > 0 || (sptr < ABSIZE && SSL_want_write(ssl))) { - FD_SET(s_out, &wr); - } - } - - now = dnow(); - if (tv_cutover && now > start + tv_cutover) { - rfbLog("SSL: ssl_xfer[%d]: tv_cutover: %d\n", getpid(), - tv_cutover); - tv_cutover = 0; - if (is_https) { - tv_use = tv_https_later; - } else { - tv_use = tv_vnc_later; - } - /* try to clean out some zombies if we can. */ - ssl_helper_pid(0, -2); - } - if (ssl_timeout_secs > 0) { - tv_use = ssl_timeout_secs; - } - - if ( (s_rd && c_rd) || cptr || sptr) { - closing = 0; - } else { - closing = 1; - tv_use = tv_closing; - } - - tv.tv_sec = tv_use; - tv.tv_usec = 0; - - /* do the select, repeat if interrupted */ - do { - if (ssl_timeout_secs == 0) { - nfd = select(fdmax+1, &rd, &wr, NULL, NULL); - } else { - nfd = select(fdmax+1, &rd, &wr, NULL, &tv); - } - } while (nfd < 0 && errno == EINTR); - - if (db > 1) fprintf(stderr, "nfd: %d\n", nfd); - -if (0) fprintf(stderr, "nfd[%d]: %d w/r csock: %d %d s_in: %d %d\n", getpid(), nfd, FD_ISSET(csock, &wr), FD_ISSET(csock, &rd), FD_ISSET(s_out, &wr), FD_ISSET(s_in, &rd)); - - if (nfd < 0) { - rfbLog("SSL: ssl_xfer[%d]: select error: %d\n", getpid(), nfd); - perror("select"); - /* connection finished */ - goto done; - } - - if (nfd == 0) { - if (!closing && tv_cutover && ndata > 25000) { - static int cn = 0; - /* probably ok, early windows iconify */ - if (cn++ < 2) { - rfbLog("SSL: ssl_xfer[%d]: early time" - "out: %d\n", getpid(), ndata); - } - continue; - } - rfbLog("SSL: ssl_xfer[%d]: connection timedout. %d tv_use: %d\n", - getpid(), ndata, tv_use); - /* connection finished */ - goto done; - } - - /* used to see if SSL_pending() should be checked: */ - check_pending = 0; -/* AUDIT */ - - if (c_wr && FD_ISSET(csock, &wr)) { - - /* try to write some of our sbuf to C: */ - n = write(csock, sbuf, sptr); - - if (n < 0) { - if (errno != EINTR) { - /* connection finished */ - goto done; - } - /* proceed */ - } else if (n == 0) { - /* connection finished XXX double check */ - goto done; - } else { - /* shift over the data in sbuf by n */ - memmove(sbuf, sbuf + n, sptr - n); - if (sptr == ABSIZE) { - check_pending = 1; - } - sptr -= n; - - if (! s_rd && sptr == 0) { - /* finished sending last of sbuf */ - shutdown(csock, SHUT_WR); - c_wr = 0; - } - ndata += n; - } - } - - if (s_wr) { - if ((cptr > 0 && FD_ISSET(s_out, &wr)) || - (SSL_want_read(ssl) && FD_ISSET(s_in, &rd))) { - - /* try to write some of our cbuf to S: */ - - n = SSL_write(ssl, cbuf, cptr); - err = SSL_get_error(ssl, n); - - if (err == SSL_ERROR_NONE) { - /* shift over the data in cbuf by n */ - memmove(cbuf, cbuf + n, cptr - n); - cptr -= n; - - if (! c_rd && cptr == 0 && s_wr) { - /* finished sending last cbuf */ - SSL_shutdown(ssl); - s_wr = 0; - } - ndata += n; - - } else if (err == SSL_ERROR_WANT_WRITE - || err == SSL_ERROR_WANT_READ - || err == SSL_ERROR_WANT_X509_LOOKUP) { - - ; /* proceed */ - - } else if (err == SSL_ERROR_SYSCALL) { - if (n < 0 && errno != EINTR) { - /* connection finished */ - goto done; - } - /* proceed */ - } else if (err == SSL_ERROR_ZERO_RETURN) { - /* S finished */ - s_rd = 0; - s_wr = 0; - } else if (err == SSL_ERROR_SSL) { - /* connection finished */ - goto done; - } - } - } - - if (c_rd && FD_ISSET(csock, &rd)) { - - - /* try to read some data from C into our cbuf */ - - n = read(csock, cbuf + cptr, ABSIZE - cptr); - - if (n < 0) { - if (errno != EINTR) { - /* connection finished */ - goto done; - } - /* proceed */ - } else if (n == 0) { - /* C is EOF */ - c_rd = 0; - if (cptr == 0 && s_wr) { - /* and no more in cbuf to send */ - SSL_shutdown(ssl); - s_wr = 0; - } - } else { - /* good */ - - cptr += n; - ndata += n; - } - } - - if (s_rd) { - if ((sptr < ABSIZE && FD_ISSET(s_in, &rd)) || - (SSL_want_write(ssl) && FD_ISSET(s_out, &wr)) || - (check_pending && SSL_pending(ssl))) { - - /* try to read some data from S into our sbuf */ - - n = SSL_read(ssl, sbuf + sptr, ABSIZE - sptr); - err = SSL_get_error(ssl, n); - - if (err == SSL_ERROR_NONE) { - /* good */ - - sptr += n; - ndata += n; - - } else if (err == SSL_ERROR_WANT_WRITE - || err == SSL_ERROR_WANT_READ - || err == SSL_ERROR_WANT_X509_LOOKUP) { - - ; /* proceed */ - - } else if (err == SSL_ERROR_SYSCALL) { - if (n < 0) { - if(errno != EINTR) { - /* connection finished */ - goto done; - } - /* proceed */ - } else { - /* S finished */ - s_rd = 0; - s_wr = 0; - } - } else if (err == SSL_ERROR_ZERO_RETURN) { - /* S is EOF */ - s_rd = 0; - if (cptr == 0 && s_wr) { - /* and no more in cbuf to send */ - SSL_shutdown(ssl); - s_wr = 0; - } - if (sptr == 0 && c_wr) { - /* and no more in sbuf to send */ - shutdown(csock, SHUT_WR); - c_wr = 0; - } - } else if (err == SSL_ERROR_SSL) { - /* connection finished */ - goto done; - } - } - } - } - - done: - rfbLog("SSL: ssl_xfer[%d]: closing sockets %d, %d, %d\n", - getpid(), csock, s_in, s_out); - close(csock); - close(s_in); - close(s_out); - return; -} - -#define MSZ 4096 -static void init_prng(void) { - int db = 0, bytes, ubytes, fd; - char file[MSZ], dtmp[100]; - unsigned int sr; - - RAND_file_name(file, MSZ); - - rfbLog("RAND_file_name: %s\n", file); - - bytes = RAND_load_file(file, -1); - if (db) fprintf(stderr, "bytes read: %d\n", bytes); - - ubytes = RAND_load_file("/dev/urandom", 64); - bytes += ubytes; - if (db) fprintf(stderr, "bytes read: %d / %d\n", bytes, ubytes); - - /* mix in more predictable stuff as well for fallback */ - sprintf(dtmp, "/tmp/p%.8f.XXXXXX", dnow()); - fd = mkstemp(dtmp); - RAND_add(dtmp, strlen(dtmp), 0); - if (fd >= 0) { - close(fd); - unlink(dtmp); - } - sprintf(dtmp, "%d-%.8f", (int) getpid(), dnow()); - RAND_add(dtmp, strlen(dtmp), 0); - - if (!RAND_status()) { - ubytes = -1; - rfbLog("calling RAND_poll()\n"); - RAND_poll(); - } - - RAND_bytes((unsigned char *)&sr, 4); - srand(sr); - - if (bytes > 0) { - if (! quiet) { - rfbLog("initialized PRNG with %d random bytes.\n", - bytes); - } - if (ubytes > 32 && rnow() < 0.25) { - RAND_write_file(file); - } - return; - } - - bytes += RAND_load_file("/dev/random", 8); - if (db) fprintf(stderr, "bytes read: %d\n", bytes); - RAND_poll(); - - if (! quiet) { - rfbLog("initialized PRNG with %d random bytes.\n", bytes); - } -} -#endif /* FORK_OK */ -#endif /* LIBVNCSERVER_HAVE_LIBSSL */ - -void check_openssl(void) { - fd_set fds; - struct timeval tv; - int nfds, nmax = openssl_sock; - static time_t last_waitall = 0; - static double last_check = 0.0; - double now; - - if (! use_openssl) { - return; - } - - if (time(NULL) > last_waitall + 120) { - last_waitall = time(NULL); - ssl_helper_pid(0, -2); /* waitall */ - } - - if (openssl_sock < 0 && openssl_sock6 < 0) { - return; - } - - now = dnow(); - if (now < last_check + 0.5) { - return; - } - last_check = now; - - FD_ZERO(&fds); - if (openssl_sock >= 0) { - FD_SET(openssl_sock, &fds); - } - if (openssl_sock6 >= 0) { - FD_SET(openssl_sock6, &fds); - if (openssl_sock6 > openssl_sock) { - nmax = openssl_sock6; - } - } - - tv.tv_sec = 0; - tv.tv_usec = 0; - - nfds = select(nmax+1, &fds, NULL, NULL, &tv); - - if (nfds <= 0) { - return; - } - - if (openssl_sock >= 0 && FD_ISSET(openssl_sock, &fds)) { - rfbLog("SSL: accept_openssl(OPENSSL_VNC)\n"); - accept_openssl(OPENSSL_VNC, -1); - } - if (openssl_sock6 >= 0 && FD_ISSET(openssl_sock6, &fds)) { - rfbLog("SSL: accept_openssl(OPENSSL_VNC6)\n"); - accept_openssl(OPENSSL_VNC6, -1); - } -} - -void check_https(void) { - fd_set fds; - struct timeval tv; - int nfds, nmax = https_sock; - static double last_check = 0.0; - double now; - - if (! use_openssl || (https_sock < 0 && https_sock6 < 0)) { - return; - } - - now = dnow(); - if (now < last_check + 0.5) { - return; - } - last_check = now; - - FD_ZERO(&fds); - if (https_sock >= 0) { - FD_SET(https_sock, &fds); - } - if (https_sock6 >= 0) { - FD_SET(https_sock6, &fds); - if (https_sock6 > https_sock) { - nmax = https_sock6; - } - } - - tv.tv_sec = 0; - tv.tv_usec = 0; - - nfds = select(nmax+1, &fds, NULL, NULL, &tv); - - if (nfds <= 0) { - return; - } - - if (https_sock >= 0 && FD_ISSET(https_sock, &fds)) { - rfbLog("SSL: accept_openssl(OPENSSL_HTTPS)\n"); - accept_openssl(OPENSSL_HTTPS, -1); - } - if (https_sock6 >= 0 && FD_ISSET(https_sock6, &fds)) { - rfbLog("SSL: accept_openssl(OPENSSL_HTTPS6)\n"); - accept_openssl(OPENSSL_HTTPS6, -1); - } -} - -void openssl_port(int restart) { - int sock = -1, shutdown = 0; - static int port = -1; - static in_addr_t iface = INADDR_ANY; - int db = 0, fd6 = -1; - - if (! screen) { - rfbLog("openssl_port: no screen!\n"); - clean_up_exit(1); - } - if (inetd) { - ssl_initialized = 1; - return; - } - - if (ipv6_listen && screen->port <= 0) { - if (got_rfbport) { - screen->port = got_rfbport_val; - } else { - int ap = 5900; - if (auto_port > 0) { - ap = auto_port; - } - screen->port = find_free_port6(ap, ap+200); - } - rfbLog("openssl_port: reset port from 0 => %d\n", screen->port); - } - - if (restart) { - port = screen->port; - } else if (screen->listenSock > -1 && screen->port > 0) { - port = screen->port; - shutdown = 1; - } else if (ipv6_listen && screen->port > 0) { - port = screen->port; - } else if (screen->port == 0) { - port = screen->port; - } - - iface = screen->listenInterface; - - if (shutdown) { - if (db) fprintf(stderr, "shutting down %d/%d\n", - port, screen->listenSock); -#if LIBVNCSERVER_HAS_SHUTDOWNSOCKETS - rfbShutdownSockets(screen); -#endif - } - - if (openssl_sock >= 0) { - close(openssl_sock); - openssl_sock = -1; - } - if (openssl_sock6 >= 0) { - close(openssl_sock6); - openssl_sock6 = -1; - } - - if (port < 0) { - rfbLog("openssl_port: could not obtain listening port %d\n", port); - if (!got_rfbport && !got_ipv6_listen) { - rfbLog("openssl_port: if this system is IPv6-only, use the -6 option\n"); - } - clean_up_exit(1); - } else if (port == 0) { - /* no listen case, i.e. -connect */ - sock = -1; - } else { - sock = listen_tcp(port, iface, 0); - if (ipv6_listen) { - fd6 = listen6(port); - } else if (!got_rfbport && !got_ipv6_listen) { - if (sock < 0) { - rfbLog("openssl_port: if this system is IPv6-only, use the -6 option\n"); - } - } - if (sock < 0) { - if (fd6 < 0) { - rfbLog("openssl_port: could not reopen port %d\n", port); - if (!restart) { - clean_up_exit(1); - } - } else { - rfbLog("openssl_port: Info: listening on IPv6 only.\n"); - } - } - } - rfbLog("openssl_port: listen on port/sock %d/%d\n", port, sock); - if (ipv6_listen && port > 0) { - if (fd6 < 0) { - fd6 = listen6(port); - } - if (fd6 < 0) { - ipv6_listen = 0; - } else { - rfbLog("openssl_port: listen on port/sock %d/%d (ipv6)\n", - port, fd6); - openssl_sock6 = fd6; - } - } - if (!quiet && sock >=0) { - announce(port, 1, NULL); - } - openssl_sock = sock; - openssl_port_num = port; - - ssl_initialized = 1; -} - -void https_port(int restart) { - int sock, fd6 = -1; - static int port = 0; - static in_addr_t iface = INADDR_ANY; - - /* as openssl_port above: open a listening socket for pure https: */ - if (https_port_num < 0) { - return; - } - if (! screen) { - rfbLog("https_port: no screen!\n"); - clean_up_exit(1); - } - if (! screen->httpDir) { - return; - } - if (screen->listenInterface) { - iface = screen->listenInterface; - } - - if (https_port_num == 0) { - https_port_num = find_free_port(5801, 5851); - } - if (ipv6_listen && https_port_num <= 0) { - https_port_num = find_free_port6(5801, 5851); - } - if (https_port_num <= 0) { - rfbLog("https_port: could not find port %d\n", https_port_num); - clean_up_exit(1); - } - port = https_port_num; - - if (port <= 0) { - rfbLog("https_port: could not obtain listening port %d\n", port); - if (!restart) { - clean_up_exit(1); - } else { - return; - } - } - if (https_sock >= 0) { - close(https_sock); - https_sock = -1; - } - if (https_sock6 >= 0) { - close(https_sock6); - https_sock6 = -1; - } - sock = listen_tcp(port, iface, 0); - if (sock < 0) { - rfbLog("https_port: could not open port %d\n", port); - if (ipv6_listen) { - fd6 = listen6(port); - } - if (fd6 < 0) { - if (!restart) { - clean_up_exit(1); - } - } - rfbLog("https_port: trying IPv6 only mode.\n"); - } - rfbLog("https_port: listen on port/sock %d/%d\n", port, sock); - https_sock = sock; - - if (ipv6_listen) { - if (fd6 < 0) { - fd6 = listen6(port); - } - if (fd6 < 0) { - ; - } else { - rfbLog("https_port: listen on port/sock %d/%d (ipv6)\n", - port, fd6); - https_sock6 = fd6; - } - if (fd6 < 0 && https_sock < 0) { - rfbLog("https_port: could not listen on either IPv4 or IPv6.\n"); - if (!restart) { - clean_up_exit(1); - } - } - } -} - -static void lose_ram(void) { - /* - * for a forked child that will be around for a long time - * without doing exec(). we really should re-exec, but a pain - * to redo all SSL ctx. - */ - free_old_fb(); - - free_tiles(); -} - -/* utility to keep track of existing helper processes: */ - -void ssl_helper_pid(pid_t pid, int sock) { -# define HPSIZE 256 - static pid_t helpers[HPSIZE]; - static int sockets[HPSIZE], first = 1; - int i, empty, set, status; - static int db = 0; - - if (first) { - for (i=0; i < HPSIZE; i++) { - helpers[i] = 0; - sockets[i] = 0; - } - if (getenv("SSL_HELPER_PID_DB")) { - db = 1; - } - first = 0; - } - - - if (pid == 0) { - /* killall or waitall */ - for (i=0; i < HPSIZE; i++) { - if (helpers[i] == 0) { - sockets[i] = -1; - continue; - } - if (kill(helpers[i], 0) == 0) { - int kret = -2; - pid_t wret; - if (sock != -2) { - if (sockets[i] >= 0) { - close(sockets[i]); - } - kret = kill(helpers[i], SIGTERM); - if (kret == 0) { - usleep(20 * 1000); - } - } - -#if LIBVNCSERVER_HAVE_SYS_WAIT_H && LIBVNCSERVER_HAVE_WAITPID - wret = waitpid(helpers[i], &status, WNOHANG); - -if (db) fprintf(stderr, "waitpid(%d)\n", helpers[i]); -if (db) fprintf(stderr, " waitret1=%d\n", wret); - - if (kret == 0 && wret != helpers[i]) { - int k; - for (k=0; k < 10; k++) { - usleep(100 * 1000); - wret = waitpid(helpers[i], &status, WNOHANG); -if (db) fprintf(stderr, " waitret2=%d\n", wret); - if (wret == helpers[i]) { - break; - } - } - } -#endif - if (sock == -2) { - continue; - } - } - helpers[i] = 0; - sockets[i] = -1; - } - return; - } - -if (db) fprintf(stderr, "ssl_helper_pid(%d, %d)\n", pid, sock); - - /* add (or delete for sock == -1) */ - set = 0; - empty = -1; - for (i=0; i < HPSIZE; i++) { - if (helpers[i] == pid) { - if (sock == -1) { -#if LIBVNCSERVER_HAVE_SYS_WAIT_H && LIBVNCSERVER_HAVE_WAITPID - pid_t wret; - wret = waitpid(helpers[i], &status, WNOHANG); - -if (db) fprintf(stderr, "waitpid(%d) 2\n", helpers[i]); -if (db) fprintf(stderr, " waitret1=%d\n", wret); -#endif - helpers[i] = 0; - } - sockets[i] = sock; - set = 1; - } else if (empty == -1 && helpers[i] == 0) { - empty = i; - } - } - if (set || sock == -1) { - return; /* done */ - } - - /* now try to store */ - if (empty >= 0) { - helpers[empty] = pid; - sockets[empty] = sock; - return; - } - for (i=0; i < HPSIZE; i++) { - if (helpers[i] == 0) { - continue; - } - /* clear out stale pids: */ - if (kill(helpers[i], 0) != 0) { - helpers[i] = 0; - sockets[i] = -1; - - if (empty == -1) { - empty = i; - } - } - } - if (empty >= 0) { - helpers[empty] = pid; - sockets[empty] = sock; - } -} - -static int is_ssl_readable(int s_in, double last_https, char *last_get, - int mode) { - int nfd, db = 0; - struct timeval tv; - fd_set rd; - - if (getenv("ACCEPT_OPENSSL_DEBUG")) { - db = atoi(getenv("ACCEPT_OPENSSL_DEBUG")); - } - - /* - * we'll do a select() on s_in for reading. this is not an - * absolute proof that SSL_read is ready (XXX use SSL utility). - */ - tv.tv_sec = 2; - tv.tv_usec = 0; - - if (mode == OPENSSL_INETD) { - /* - * https via inetd is icky because x11vnc is restarted - * for each socket (and some clients send requests - * rapid fire). - */ - tv.tv_sec = 4; - } - - /* - * increase the timeout if we know HTTP traffic has occurred - * recently: - */ - if (dnow() < last_https + 30.0) { - tv.tv_sec = 10; - if (last_get && strstr(last_get, "VncViewer")) { - tv.tv_sec = 5; - } - } - if (getenv("X11VNC_HTTPS_VS_VNC_TIMEOUT")) { - tv.tv_sec = atoi(getenv("X11VNC_HTTPS_VS_VNC_TIMEOUT")); - } -if (db) fprintf(stderr, "tv_sec: %d - '%s'\n", (int) tv.tv_sec, last_get); - - FD_ZERO(&rd); - FD_SET(s_in, &rd); - - if (db) fprintf(stderr, "is_ssl_readable: begin select(%d secs) %.6f\n", (int) tv.tv_sec, dnow()); - do { - nfd = select(s_in+1, &rd, NULL, NULL, &tv); - } while (nfd < 0 && errno == EINTR); - if (db) fprintf(stderr, "is_ssl_readable: finish select(%d secs) %.6f\n", (int) tv.tv_sec, dnow()); - - if (db) fprintf(stderr, "https nfd: %d\n", nfd); - - if (nfd <= 0 || ! FD_ISSET(s_in, &rd)) { - return 0; - } - return 1; -} - -static int watch_for_http_traffic(char *buf_a, int *n_a, int raw_sock) { - int is_http, err, n, n2; - char *buf; - int db = 0; - /* - * sniff the first couple bytes of the stream and try to see - * if it is http or not. if we read them OK, we must read the - * rest of the available data otherwise we may deadlock. - * what has been read is returned in buf_a and n_a. - * *buf_a is ABSIZE+1 long and zeroed. - */ - if (getenv("ACCEPT_OPENSSL_DEBUG")) { - db = atoi(getenv("ACCEPT_OPENSSL_DEBUG")); - } - if (! buf_a || ! n_a) { - return 0; - } - - buf = (char *) calloc((ABSIZE+1), 1); - *n_a = 0; - - if (enc_str && !strcmp(enc_str, "none")) { - n = read(raw_sock, buf, 2); - err = SSL_ERROR_NONE; - } else { -#if LIBVNCSERVER_HAVE_LIBSSL - n = SSL_read(ssl, buf, 2); - err = SSL_get_error(ssl, n); -#else - err = n = 0; - badnews("1 in watch_for_http_traffic"); -#endif - } - - if (err != SSL_ERROR_NONE || n < 2) { - if (n > 0) { - strncpy(buf_a, buf, n); - *n_a = n; - } - if (db) fprintf(stderr, "watch_for_http_traffic ssl err: %d/%d\n", err, n); - return -1; - } - - /* look for GET, HEAD, POST, CONNECT */ - is_http = 0; - if (!strncmp("GE", buf, 2)) { - is_http = 1; - } else if (!strncmp("HE", buf, 2)) { - is_http = 1; - } else if (!strncmp("PO", buf, 2)) { - is_http = 1; - } else if (!strncmp("CO", buf, 2)) { - is_http = 1; - } - if (db) fprintf(stderr, "watch_for_http_traffic read: '%s' %d\n", buf, n); - - /* - * better read all we can and fwd it along to avoid blocking - * in ssl_xfer(). - */ - - if (enc_str && !strcmp(enc_str, "none")) { - n2 = read(raw_sock, buf + n, ABSIZE - n); - } else { -#if LIBVNCSERVER_HAVE_LIBSSL - n2 = SSL_read(ssl, buf + n, ABSIZE - n); -#else - n2 = 0; - badnews("2 in watch_for_http_traffic"); -#endif - } - if (n2 >= 0) { - n += n2; - } - - *n_a = n; - - if (db) fprintf(stderr, "watch_for_http_traffic readmore: %d\n", n2); - - if (n > 0) { - memcpy(buf_a, buf, n); - } - if (db > 1) { - fprintf(stderr, "watch_for_http_traffic readmore: "); - write(2, buf_a, *n_a); - fprintf(stderr, "\n"); - } - if (db) fprintf(stderr, "watch_for_http_traffic return: %d\n", is_http); - return is_http; -} - -static int csock_timeout_sock = -1; - -static void csock_timeout (int sig) { - rfbLog("sig: %d, csock_timeout.\n", sig); - if (csock_timeout_sock >= 0) { - close(csock_timeout_sock); - csock_timeout_sock = -1; - } -} - -static int check_ssl_access(char *addr) { - static char *save_allow_once = NULL; - static time_t time_allow_once = 0; - - /* due to "Fetch Cert" activities for SSL really need to "allow twice" */ - if (allow_once != NULL) { - save_allow_once = strdup(allow_once); - time_allow_once = time(NULL); - } else if (save_allow_once != NULL) { - if (getenv("X11VNC_NO_SSL_ALLOW_TWICE")) { - ; - } else if (time(NULL) < time_allow_once + 30) { - /* give them 30 secs to check and save the fetched cert. */ - allow_once = save_allow_once; - rfbLog("SSL: Permitting 30 sec grace period for allowonce.\n"); - rfbLog("SSL: Set X11VNC_NO_SSL_ALLOW_TWICE=1 to disable.\n"); - } - save_allow_once = NULL; - time_allow_once = 0; - } - - return check_access(addr); -} - -void accept_openssl(int mode, int presock) { - int sock = -1, listen = -1, cport, csock, vsock; - int peerport = 0; - int status, n, i, db = 0; - struct sockaddr_in addr; -#ifdef __hpux - int addrlen = sizeof(addr); -#else - socklen_t addrlen = sizeof(addr); -#endif - rfbClientPtr client; - pid_t pid; - char uniq[] = "_evilrats_"; - char cookie[256], rcookie[256], *name = NULL; - int vencrypt_sel = 0; - int anontls_sel = 0; - char *ipv6_name = NULL; - static double last_https = 0.0; - static char last_get[256]; - static int first = 1; - unsigned char *rb; - -#if !LIBVNCSERVER_HAVE_LIBSSL - if (enc_str == NULL || strcmp(enc_str, "none")) { - badnews("0 accept_openssl"); - } -#endif - - openssl_last_helper_pid = 0; - - /* zero buffers for use below. */ - for (i=0; i<256; i++) { - if (first) { - last_get[i] = '\0'; - } - cookie[i] = '\0'; - rcookie[i] = '\0'; - } - first = 0; - - if (getenv("ACCEPT_OPENSSL_DEBUG")) { - db = atoi(getenv("ACCEPT_OPENSSL_DEBUG")); - } - - /* do INETD, VNC, or HTTPS cases (result is client socket or pipe) */ - if (mode == OPENSSL_INETD) { - ssl_initialized = 1; - - } else if (mode == OPENSSL_VNC) { - sock = accept(openssl_sock, (struct sockaddr *)&addr, &addrlen); - if (sock < 0) { - rfbLog("SSL: accept_openssl: accept connection failed\n"); - rfbLogPerror("accept"); - if (ssl_no_fail) { - clean_up_exit(1); - } - return; - } - listen = openssl_sock; - - } else if (mode == OPENSSL_VNC6 || mode == OPENSSL_HTTPS6) { -#if X11VNC_IPV6 - struct sockaddr_in6 a6; - socklen_t a6len = sizeof(a6); - int fd = (mode == OPENSSL_VNC6 ? openssl_sock6 : https_sock6); - - sock = accept(fd, (struct sockaddr *)&a6, &a6len); - if (sock < 0) { - rfbLog("SSL: accept_openssl: accept connection failed\n"); - rfbLogPerror("accept"); - if (ssl_no_fail) { - clean_up_exit(1); - } - return; - } - ipv6_name = ipv6_getipaddr((struct sockaddr *)&a6, a6len); - if (!ipv6_name) ipv6_name = strdup("unknown"); - listen = fd; -#endif - } else if (mode == OPENSSL_REVERSE) { - sock = presock; - if (sock < 0) { - rfbLog("SSL: accept_openssl: connection failed\n"); - if (ssl_no_fail) { - clean_up_exit(1); - } - return; - } - if (getenv("OPENSSL_REVERSE_DEBUG")) fprintf(stderr, "OPENSSL_REVERSE: ipv6_client_ip_str: %s\n", ipv6_client_ip_str); - if (ipv6_client_ip_str != NULL) { - ipv6_name = strdup(ipv6_client_ip_str); - } - listen = -1; - - } else if (mode == OPENSSL_HTTPS) { - sock = accept(https_sock, (struct sockaddr *)&addr, &addrlen); - if (sock < 0) { - rfbLog("SSL: accept_openssl: accept connection failed\n"); - rfbLogPerror("accept"); - if (ssl_no_fail) { - clean_up_exit(1); - } - return; - } - listen = https_sock; - } - if (db) fprintf(stderr, "SSL: accept_openssl: sock: %d\n", sock); - - if (openssl_last_ip) { - free(openssl_last_ip); - openssl_last_ip = NULL; - } - if (mode == OPENSSL_INETD) { - openssl_last_ip = get_remote_host(fileno(stdin)); - } else if (mode == OPENSSL_VNC6 || mode == OPENSSL_HTTPS6) { - openssl_last_ip = ipv6_name; - } else if (mode == OPENSSL_REVERSE && ipv6_name != NULL) { - openssl_last_ip = ipv6_name; - } else { - openssl_last_ip = get_remote_host(sock); - } - - if (!check_ssl_access(openssl_last_ip)) { - rfbLog("SSL: accept_openssl: denying client %s\n", openssl_last_ip); - rfbLog("SSL: accept_openssl: does not match -allow or other reason.\n"); - close(sock); - sock = -1; - if (ssl_no_fail) { - clean_up_exit(1); - } - return; - } - - /* now make a listening socket for child to connect back to us by: */ - - cport = find_free_port(20000, 22000); - if (! cport && ipv6_listen) { - rfbLog("SSL: accept_openssl: seeking IPv6 port.\n"); - cport = find_free_port6(20000, 22000); - rfbLog("SSL: accept_openssl: IPv6 port: %d\n", cport); - } - if (! cport) { - rfbLog("SSL: accept_openssl: could not find open port.\n"); - close(sock); - if (mode == OPENSSL_INETD || ssl_no_fail) { - clean_up_exit(1); - } - return; - } - if (db) fprintf(stderr, "accept_openssl: cport: %d\n", cport); - - csock = listen_tcp(cport, htonl(INADDR_LOOPBACK), 1); - - if (csock < 0) { - rfbLog("SSL: accept_openssl: could not listen on port %d.\n", - cport); - close(sock); - if (mode == OPENSSL_INETD || ssl_no_fail) { - clean_up_exit(1); - } - return; - } - if (db) fprintf(stderr, "accept_openssl: csock: %d\n", csock); - - fflush(stderr); - - /* - * make a simple cookie to id the child socket, not foolproof - * but hard to guess exactly (just worrying about local lusers - * here, since we use INADDR_LOOPBACK). - */ - rb = (unsigned char *) calloc(6, 1); -#if LIBVNCSERVER_HAVE_LIBSSL - RAND_bytes(rb, 6); -#endif - sprintf(cookie, "RB=%d%d%d%d%d%d/%f%f/%p", - rb[0], rb[1], rb[2], rb[3], rb[4], rb[5], - dnow() - x11vnc_start, x11vnc_start, (void *)rb); - - if (mode == OPENSSL_VNC6) { - name = strdup(ipv6_name); - peerport = get_remote_port(sock); - } else if (mode == OPENSSL_REVERSE && ipv6_name != NULL) { - name = strdup(ipv6_name); - peerport = get_remote_port(sock); - } else if (mode != OPENSSL_INETD) { - name = get_remote_host(sock); - peerport = get_remote_port(sock); - } else { - openssl_last_ip = get_remote_host(fileno(stdin)); - peerport = get_remote_port(fileno(stdin)); - if (openssl_last_ip) { - name = strdup(openssl_last_ip); - } else { - name = strdup("unknown"); - } - } - if (name) { - if (mode == OPENSSL_INETD) { - rfbLog("SSL: (inetd) spawning helper process " - "to handle: %s:%d\n", name, peerport); - } else { - rfbLog("SSL: spawning helper process to handle: " - "%s:%d\n", name, peerport); - } - free(name); - name = NULL; - } - - if (certret) { - free(certret); - } - if (certret_str) { - free(certret_str); - certret_str = NULL; - } - certret = strdup("/tmp/x11vnc-certret.XXXXXX"); - omode = umask(077); - certret_fd = mkstemp(certret); - umask(omode); - if (certret_fd < 0) { - free(certret); - certret = NULL; - certret_fd = -1; - } - - if (dhret) { - free(dhret); - } - if (dhret_str) { - free(dhret_str); - dhret_str = NULL; - } - dhret = strdup("/tmp/x11vnc-dhret.XXXXXX"); - omode = umask(077); - dhret_fd = mkstemp(dhret); - umask(omode); - if (dhret_fd < 0) { - free(dhret); - dhret = NULL; - dhret_fd = -1; - } - - /* now fork the child to handle the SSL: */ - pid = fork(); - - if (pid > 0) { - rfbLog("SSL: helper for peerport %d is pid %d: \n", - peerport, (int) pid); - } - - if (pid < 0) { - rfbLog("SSL: accept_openssl: could not fork.\n"); - rfbLogPerror("fork"); - close(sock); - close(csock); - if (mode == OPENSSL_INETD || ssl_no_fail) { - clean_up_exit(1); - } - return; - - } else if (pid == 0) { - int s_in, s_out, httpsock = -1; - int vncsock; - int i, have_httpd = 0; - int f_in = fileno(stdin); - int f_out = fileno(stdout); - int skip_vnc_tls = mode == OPENSSL_HTTPS ? 1 : 0; - - if (db) fprintf(stderr, "helper pid in: %d %d %d %d\n", f_in, f_out, sock, listen); - - /* reset all handlers to default (no interrupted() calls) */ - unset_signals(); - - /* close all non-essential fd's */ - for (i=0; i<256; i++) { - if (mode == OPENSSL_INETD) { - if (i == f_in || i == f_out) { - continue; - } - } - if (i == sock) { - continue; - } - if (i == 2) { - continue; - } - close(i); - } - - /* - * sadly, we are a long lived child and so the large - * framebuffer memory areas will soon differ from parent. - * try to free as much as possible. - */ - lose_ram(); - - /* now connect back to parent socket: */ - vncsock = connect_tcp("127.0.0.1", cport); - if (vncsock < 0) { - rfbLog("SSL: ssl_helper[%d]: could not connect" - " back to: %d\n", getpid(), cport); - rfbLog("SSL: ssl_helper[%d]: exit case 1 (no local vncsock)\n", getpid()); - exit(1); - } - if (db) fprintf(stderr, "vncsock %d\n", vncsock); - - /* try to initialize SSL with the remote client */ - - if (mode == OPENSSL_INETD) { - s_in = fileno(stdin); - s_out = fileno(stdout); - } else { - s_in = s_out = sock; - } - - if (! ssl_init(s_in, s_out, skip_vnc_tls, last_https)) { - close(vncsock); - rfbLog("SSL: ssl_helper[%d]: exit case 2 (ssl_init failed)\n", getpid()); - exit(1); - } - - if (vencrypt_selected != 0) { - char *tbuf; - tbuf = (char *) malloc(strlen(cookie) + 100); - sprintf(tbuf, "%s,VENCRYPT=%d,%s", uniq, vencrypt_selected, cookie); - write(vncsock, tbuf, strlen(cookie)); - goto wrote_cookie; - } else if (anontls_selected != 0) { - char *tbuf; - tbuf = (char *) malloc(strlen(cookie) + 100); - sprintf(tbuf, "%s,ANONTLS=%d,%s", uniq, anontls_selected, cookie); - write(vncsock, tbuf, strlen(cookie)); - goto wrote_cookie; - } - - /* - * things get messy below since we are trying to do - * *both* VNC and Java applet httpd through the same - * SSL socket. - */ - - if (! screen) { - close(vncsock); - exit(1); - } - if (screen->httpListenSock >= 0 && screen->httpPort > 0) { - have_httpd = 1; - } else if (ipv6_http_fd >= 0) { - have_httpd = 1; - } else if (screen->httpListenSock == -2) { - have_httpd = 1; - } - if (mode == OPENSSL_HTTPS && ! have_httpd) { - rfbLog("SSL: accept_openssl[%d]: no httpd socket for " - "-https mode\n", getpid()); - close(vncsock); - rfbLog("SSL: ssl_helper[%d]: exit case 3 (no httpd sock)\n", getpid()); - exit(1); - } - - if (have_httpd) { - int n = 0, is_http = 0; - int hport = screen->httpPort; - char *iface = NULL; - char *buf, *tbuf; - - buf = (char *) calloc((ABSIZE+1), 1); - tbuf = (char *) calloc((2*ABSIZE+1), 1); - - if (mode == OPENSSL_HTTPS) { - /* - * for this mode we know it is HTTP traffic - * so we skip trying to guess. - */ - is_http = 1; - n = 0; - goto connect_to_httpd; - } - - /* - * Check if there is stuff to read from remote end - * if so it is likely a GET or HEAD. - */ - if (! is_ssl_readable(s_in, last_https, last_get, - mode)) { - goto write_cookie; - } - - /* - * read first 2 bytes to try to guess. sadly, - * the user is often pondering a "non-verified - * cert" dialog for a long time before the GET - * is ever sent. So often we timeout here. - */ - - if (db) fprintf(stderr, "watch_for_http_traffic\n"); - - is_http = watch_for_http_traffic(buf, &n, s_in); - - if (is_http < 0 || is_http == 0) { - /* - * error or http not detected, fall back - * to normal VNC socket. - */ - if (db) fprintf(stderr, "is_http err: %d n: %d\n", is_http, n); - write(vncsock, cookie, strlen(cookie)); - if (n > 0) { - write(vncsock, buf, n); - } - goto wrote_cookie; - } - - if (db) fprintf(stderr, "is_http: %d n: %d\n", - is_http, n); - if (db) fprintf(stderr, "buf: '%s'\n", buf); - - if (strstr(buf, "/request.https.vnc.connection")) { - char reply[] = "HTTP/1.0 200 OK\r\n" - "Content-Type: octet-stream\r\n" - "Connection: Keep-Alive\r\n" - "VNC-Server: x11vnc\r\n" - "Pragma: no-cache\r\n\r\n"; - /* - * special case proxy coming thru https - * instead of a direct SSL connection. - */ - rfbLog("Handling VNC request via https GET. [%d]\n", getpid()); - rfbLog("-- %s\n", buf); - - if (strstr(buf, "/reverse.proxy")) { - char *buf2; - int n, ptr; -#if !LIBVNCSERVER_HAVE_LIBSSL - write(s_out, reply, strlen(reply)); -#else - SSL_write(ssl, reply, strlen(reply)); -#endif - - buf2 = (char *) calloc((8192+1), 1); - n = 0; - ptr = 0; - while (ptr < 8192) { -#if !LIBVNCSERVER_HAVE_LIBSSL - n = read(s_in, buf2 + ptr, 1); -#else - n = SSL_read(ssl, buf2 + ptr, 1); -#endif - if (n > 0) { - ptr += n; - } - if (db) fprintf(stderr, "buf2: '%s'\n", buf2); - - if (strstr(buf2, "\r\n\r\n")) { - break; - } - } - free(buf2); - } - goto write_cookie; - - } else if (strstr(buf, "/check.https.proxy.connection")) { - char reply[] = "HTTP/1.0 200 OK\r\n" - "Connection: close\r\n" - "Content-Type: octet-stream\r\n" - "VNC-Server: x11vnc\r\n" - "Pragma: no-cache\r\n\r\n"; - - rfbLog("Handling Check HTTPS request via https GET. [%d]\n", getpid()); - rfbLog("-- %s\n", buf); - -#if !LIBVNCSERVER_HAVE_LIBSSL - write(s_out, reply, strlen(reply)); -#else - SSL_write(ssl, reply, strlen(reply)); - SSL_shutdown(ssl); -#endif - - strcpy(tbuf, uniq); - strcat(tbuf, cookie); - write(vncsock, tbuf, strlen(tbuf)); - close(vncsock); - - rfbLog("SSL: ssl_helper[%d]: exit case 4 (check.https.proxy.connection)\n", getpid()); - exit(0); - } - connect_to_httpd: - - /* - * Here we go... no turning back. we have to - * send failure to parent and close socket to have - * http processed at all in a timely fashion... - */ - - /* send the failure tag: */ - strcpy(tbuf, uniq); - - if (https_port_redir < 0 || (strstr(buf, "PORT=") || strstr(buf, "port="))) { - char *q = strstr(buf, "Host:"); - int fport = 443, match = 0; - char num[16]; - - if (q && strstr(q, "\n")) { - q += strlen("Host:") + 1; - while (*q != '\n') { - int p; - if (*q == ':' && sscanf(q, ":%d", &p) == 1) { - if (p > 0 && p < 65536) { - fport = p; - match = 1; - break; - } - } - q++; - } - } - if (!match || !https_port_redir) { - int p; - if (sscanf(buf, "PORT=%d,", &p) == 1) { - if (p > 0 && p < 65536) { - fport = p; - } - } else if (sscanf(buf, "port=%d,", &p) == 1) { - if (p > 0 && p < 65536) { - fport = p; - } - } - } - sprintf(num, "HP=%d,", fport); - strcat(tbuf, num); - } - - if (strstr(buf, "HTTP/") != NULL) { - char *q, *str; - /* - * Also send back the GET line for heuristics. - * (last_https, get file). - */ - str = strdup(buf); - q = strstr(str, "HTTP/"); - if (q != NULL) { - *q = '\0'; - strcat(tbuf, str); - } - free(str); - } - - /* - * Also send the cookie to pad out the number of - * bytes to more than the parent wants to read. - * Since this is the failure case, it does not - * matter that we send more than strlen(cookie). - */ - strcat(tbuf, cookie); - write(vncsock, tbuf, strlen(tbuf)); - - usleep(150*1000); - if (db) fprintf(stderr, "close vncsock: %d\n", vncsock); - close(vncsock); - - /* now, finally, connect to the libvncserver httpd: */ - if (screen->listenInterface == htonl(INADDR_ANY) || - screen->listenInterface == htonl(INADDR_NONE)) { - iface = "127.0.0.1"; - } else { - struct in_addr in; - in.s_addr = screen->listenInterface; - iface = inet_ntoa(in); - } - if (iface == NULL || !strcmp(iface, "")) { - iface = "127.0.0.1"; - } - if (db) fprintf(stderr, "iface: %s:%d\n", iface, hport); - usleep(150*1000); - - httpsock = connect_tcp(iface, hport); - - if (httpsock < 0) { - /* UGH, after all of that! */ - rfbLog("Could not connect to httpd socket!\n"); - rfbLog("SSL: ssl_helper[%d]: exit case 5.\n", getpid()); - exit(1); - } - if (db) fprintf(stderr, "ssl_helper[%d]: httpsock: %d %d\n", - getpid(), httpsock, n); - - /* - * send what we read to httpd, and then connect - * the rest of the SSL session to it: - */ - if (n > 0) { - char *s = getenv("X11VNC_EXTRA_HTTPS_PARAMS"); - int did_extra = 0; - - if (db) fprintf(stderr, "sending http buffer httpsock: %d n=%d\n'%s'\n", httpsock, n, buf); - if (s != NULL) { - char *q = strstr(buf, " HTTP/"); - if (q) { - int m; - *q = '\0'; - m = strlen(buf); - write(httpsock, buf, m); - write(httpsock, s, strlen(s)); - *q = ' '; - write(httpsock, q, n-m); - did_extra = 1; - } - } - if (!did_extra) { - write(httpsock, buf, n); - } - } - ssl_xfer(httpsock, s_in, s_out, is_http); - rfbLog("SSL: ssl_helper[%d]: exit case 6 (https ssl_xfer done)\n", getpid()); - exit(0); - } - - /* - * ok, back from the above https mess, simply send the - * cookie back to the parent (who will attach us to - * libvncserver), and connect the rest of the SSL session - * to it. - */ - write_cookie: - write(vncsock, cookie, strlen(cookie)); - - wrote_cookie: - ssl_xfer(vncsock, s_in, s_out, 0); - rfbLog("SSL: ssl_helper[%d]: exit case 7 (ssl_xfer done)\n", getpid()); - if (0) usleep(50 * 1000); - exit(0); - } - /* parent here */ - - if (mode != OPENSSL_INETD) { - close(sock); - } - if (db) fprintf(stderr, "helper process is: %d\n", pid); - - /* accept connection from our child. */ - signal(SIGALRM, csock_timeout); - csock_timeout_sock = csock; - alarm(20); - - vsock = accept(csock, (struct sockaddr *)&addr, &addrlen); - - alarm(0); - signal(SIGALRM, SIG_DFL); - close(csock); - - - if (vsock < 0) { - rfbLog("SSL: accept_openssl: connection from ssl_helper[%d] FAILED.\n", pid); - rfbLogPerror("accept"); - - kill(pid, SIGTERM); - waitpid(pid, &status, WNOHANG); - if (mode == OPENSSL_INETD || ssl_no_fail) { - clean_up_exit(1); - } - if (certret_fd >= 0) { - close(certret_fd); - certret_fd = -1; - } - if (certret) { - unlink(certret); - } - if (dhret_fd >= 0) { - close(dhret_fd); - dhret_fd = -1; - } - if (dhret) { - unlink(dhret); - } - return; - } - if (db) fprintf(stderr, "accept_openssl: vsock: %d\n", vsock); - - n = read(vsock, rcookie, strlen(cookie)); - if (n < 0 && errno != 0) { - rfbLogPerror("read"); - } - - if (certret) { - struct stat sbuf; - sbuf.st_size = 0; - if (certret_fd >= 0 && stat(certret, &sbuf) == 0 && sbuf.st_size > 0) { - certret_str = (char *) calloc(sbuf.st_size+1, 1); - read(certret_fd, certret_str, sbuf.st_size); - close(certret_fd); - certret_fd = -1; - } - if (certret_fd >= 0) { - close(certret_fd); - certret_fd = -1; - } - unlink(certret); - if (certret_str && strstr(certret_str, "NOCERT") == certret_str) { - free(certret_str); - certret_str = NULL; - } - if (0 && certret_str) { - fprintf(stderr, "certret_str[%d]:\n%s\n", (int) sbuf.st_size, certret_str); - } - } - - if (dhret) { - struct stat sbuf; - sbuf.st_size = 0; - if (dhret_fd >= 0 && stat(dhret, &sbuf) == 0 && sbuf.st_size > 0) { - dhret_str = (char *) calloc(sbuf.st_size+1, 1); - read(dhret_fd, dhret_str, sbuf.st_size); - close(dhret_fd); - dhret_fd = -1; - } - if (dhret_fd >= 0) { - close(dhret_fd); - dhret_fd = -1; - } - unlink(dhret); - if (dhret_str && strstr(dhret_str, "NOCERT") == dhret_str) { - free(dhret_str); - dhret_str = NULL; - } - if (dhret_str) { - if (new_dh_params == NULL) { - fprintf(stderr, "dhret_str[%d]:\n%s\n", (int) sbuf.st_size, dhret_str); - new_dh_params = strdup(dhret_str); - } - } - } - - if (0) { - fprintf(stderr, "rcookie: %s\n", rcookie); - fprintf(stderr, "cookie: %s\n", cookie); - } - - if (strstr(rcookie, uniq) == rcookie) { - char *q = strstr(rcookie, "RB="); - if (q && strstr(cookie, q) == cookie) { - vencrypt_sel = 0; - anontls_sel = 0; - q = strstr(rcookie, "VENCRYPT="); - if (q && sscanf(q, "VENCRYPT=%d,", &vencrypt_sel) == 1) { - if (vencrypt_sel != 0) { - rfbLog("SSL: VENCRYPT mode=%d accepted. helper[%d]\n", vencrypt_sel, pid); - goto accept_client; - } - } - q = strstr(rcookie, "ANONTLS="); - if (q && sscanf(q, "ANONTLS=%d,", &anontls_sel) == 1) { - if (anontls_sel != 0) { - rfbLog("SSL: ANONTLS mode=%d accepted. helper[%d]\n", anontls_sel, pid); - goto accept_client; - } - } - } - } - - if (n != (int) strlen(cookie) || strncmp(cookie, rcookie, n)) { - rfbLog("SSL: accept_openssl: cookie from ssl_helper[%d] FAILED. %d\n", pid, n); - if (db) fprintf(stderr, "'%s'\n'%s'\n", cookie, rcookie); - close(vsock); - - if (strstr(rcookie, uniq) == rcookie) { - int i; - double https_download_wait_time = 15.0; - - if (getenv("X11VNC_HTTPS_DOWNLOAD_WAIT_TIME")) { - https_download_wait_time = atof(getenv("X11VNC_HTTPS_DOWNLOAD_WAIT_TIME")); - } - - rfbLog("SSL: BUT WAIT! HTTPS for helper process[%d] succeeded. Good.\n", pid); - if (mode != OPENSSL_HTTPS) { - last_https = dnow(); - for (i=0; i<256; i++) { - last_get[i] = '\0'; - } - strncpy(last_get, rcookie, 100); - if (db) fprintf(stderr, "last_get: '%s'\n", last_get); - } - if (rcookie && strstr(rcookie, "VncViewer.class")) { - rfbLog("\n"); - rfbLog("helper[%d]:\n", pid); - rfbLog("***********************************************************\n"); - rfbLog("SSL: WARNING CLIENT ASKED FOR NONEXISTENT 'VncViewer.class'\n"); - rfbLog("SSL: USER NEEDS TO MAKE SURE THE JAVA PLUGIN IS INSTALLED\n"); - rfbLog("SSL: AND WORKING PROPERLY (e.g. a test-java-plugin page.)\n"); - rfbLog("SSL: AND/OR USER NEEDS TO **RESTART** HIS WEB BROWSER.\n"); - rfbLog("SSL: SOMETIMES THE BROWSER 'REMEMBERS' FAILED APPLET DOWN-\n"); - rfbLog("SSL: LOADS AND RESTARTING IT IS THE ONLY WAY TO FIX THINGS.\n"); - rfbLog("***********************************************************\n"); - rfbLog("\n"); - } - ssl_helper_pid(pid, -2); - - if (https_port_redir) { - double start; - int origport = screen->port; - int useport = screen->port; - int saw_httpsock = 0; - /* to expand $PORT correctly in index.vnc */ - if (https_port_redir < 0) { - char *q = strstr(rcookie, "HP="); - if (q) { - int p; - if (sscanf(q, "HP=%d,", &p) == 1) { - useport = p; - } - } - } else { - useport = https_port_redir; - } - screen->port = useport; - if (origport != useport) { - rfbLog("SSL: -httpsredir guess port: %d helper[%d]\n", screen->port, pid); - } - - start = dnow(); - while (dnow() < start + https_download_wait_time) { - if (screen->httpSock >= 0) saw_httpsock = 1; - rfbPE(10000); - usleep(10000); - if (screen->httpSock >= 0) saw_httpsock = 1; - waitpid(pid, &status, WNOHANG); - if (kill(pid, 0) != 0) { - rfbLog("SSL: helper[%d] pid finished\n", pid); - break; - } - if (0 && saw_httpsock && screen->httpSock < 0) { - /* this check can kill the helper too soon. */ - rfbLog("SSL: httpSock for helper[%d] went away\n", pid); - break; - } - } - rfbLog("SSL: guessing child helper[%d] https finished. dt=%.6f\n", - pid, dnow() - start); - - rfbPE(10000); - rfbPE(10000); - rfbPE(10000); - - screen->port = origport; - ssl_helper_pid(0, -2); - if (mode == OPENSSL_INETD) { - clean_up_exit(1); - } - } else if (mode == OPENSSL_INETD) { - double start; - int saw_httpsock = 0; - - /* to expand $PORT correctly in index.vnc */ - if (screen->port == 0) { - int fd = fileno(stdin); - if (getenv("X11VNC_INETD_PORT")) { - /* mutex */ - screen->port = atoi(getenv( - "X11VNC_INETD_PORT")); - } else { - int tport = get_local_port(fd); - if (tport > 0) { - screen->port = tport; - } - } - } - rfbLog("SSL: screen->port %d for helper[%d]\n", screen->port, pid); - - /* kludge for https fetch via inetd */ - start = dnow(); - while (dnow() < start + https_download_wait_time) { - if (screen->httpSock >= 0) saw_httpsock = 1; - rfbPE(10000); - usleep(10000); - if (screen->httpSock >= 0) saw_httpsock = 1; - waitpid(pid, &status, WNOHANG); - if (kill(pid, 0) != 0) { - rfbLog("SSL: helper[%d] pid finished\n", pid); - break; - } - if (0 && saw_httpsock && screen->httpSock < 0) { - /* this check can kill the helper too soon. */ - rfbLog("SSL: httpSock for helper[%d] went away\n", pid); - break; - } - } - rfbLog("SSL: OPENSSL_INETD guessing " - "child helper[%d] https finished. dt=%.6f\n", - pid, dnow() - start); - - rfbPE(10000); - rfbPE(10000); - rfbPE(10000); - - ssl_helper_pid(0, -2); - clean_up_exit(1); - } - /* this will actually only get earlier https */ - ssl_helper_pid(0, -2); - return; - } - kill(pid, SIGTERM); - waitpid(pid, &status, WNOHANG); - if (mode == OPENSSL_INETD || ssl_no_fail) { - clean_up_exit(1); - } - return; - } - - accept_client: - - if (db) fprintf(stderr, "accept_openssl: cookie good: %s\n", cookie); - - rfbLog("SSL: handshake with helper process[%d] succeeded.\n", pid); - - openssl_last_helper_pid = pid; - ssl_helper_pid(pid, vsock); - - if (vnc_redirect) { - vnc_redirect_sock = vsock; - openssl_last_helper_pid = 0; - return; - } - - client = create_new_client(vsock, 0); - openssl_last_helper_pid = 0; - - if (client) { - int swt = 0; - if (mode == OPENSSL_VNC6 && openssl_last_ip != NULL) { - swt = 1; - } else if (mode == OPENSSL_REVERSE && ipv6_name != NULL && openssl_last_ip != NULL) { - swt = 1; - } - if (swt) { - if (client->host) { - free(client->host); - } - client->host = strdup(openssl_last_ip); - } - if (db) fprintf(stderr, "accept_openssl: client %p\n", (void *) client); - if (db) fprintf(stderr, "accept_openssl: new_client %p\n", (void *) screen->newClientHook); - if (db) fprintf(stderr, "accept_openssl: new_client %p\n", (void *) new_client); - if (mode == OPENSSL_INETD) { - inetd_client = client; - client->clientGoneHook = client_gone; - } - if (openssl_last_ip && - strpbrk(openssl_last_ip, "0123456789") == openssl_last_ip) { - client->host = strdup(openssl_last_ip); - } - if (vencrypt_sel != 0) { - client->protocolMajorVersion = 3; - client->protocolMinorVersion = 8; -#if LIBVNCSERVER_HAVE_LIBSSL - if (!finish_vencrypt_auth(client, vencrypt_sel)) { - rfbCloseClient(client); - client = NULL; - } -#else - badnews("3 accept_openssl"); -#endif - } else if (anontls_sel != 0) { - client->protocolMajorVersion = 3; - client->protocolMinorVersion = 8; - rfbAuthNewClient(client); - } - if (use_threads && client != NULL) { - rfbStartOnHoldClient(client); - } - /* try to get RFB proto done now. */ - progress_client(); - } else { - rfbLog("SSL: accept_openssl: rfbNewClient failed.\n"); - close(vsock); - - kill(pid, SIGTERM); - waitpid(pid, &status, WNOHANG); - if (mode == OPENSSL_INETD || ssl_no_fail) { - clean_up_exit(1); - } - return; - } -} - -void raw_xfer(int csock, int s_in, int s_out) { - char buf0[8192]; - int sz = 8192, n, m, status, db = 1; - char *buf; -#ifdef FORK_OK - pid_t par = getpid(); - pid_t pid = fork(); - - buf = buf0; - if (vnc_redirect) { - /* change buf size some direction. */ - } - - if (getenv("X11VNC_DEBUG_RAW_XFER")) { - db = atoi(getenv("X11VNC_DEBUG_RAW_XFER")); - } - if (pid < 0) { - exit(1); - } - /* this is for testing or special helper usage, no SSL just socket redir */ - if (pid) { - if (db) rfbLog("raw_xfer start: %d -> %d/%d\n", csock, s_in, s_out); - - while (1) { - n = read(csock, buf, sz); - if (n == 0 || (n < 0 && errno != EINTR) ) { - break; - } else if (n > 0) { - int len = n; - char *src = buf; - if (db > 1) write(2, buf, n); - while (len > 0) { - m = write(s_out, src, len); - if (m > 0) { - src += m; - len -= m; - continue; - } - if (m < 0 && (errno == EINTR || errno == EAGAIN)) { - continue; - } -if (db) rfbLog("raw_xfer bad write: %d -> %d | %d/%d errno=%d\n", csock, s_out, m, n, errno); - break; - } - } - } - usleep(250*1000); - kill(pid, SIGTERM); - waitpid(pid, &status, WNOHANG); - if (db) rfbLog("raw_xfer done: %d -> %d\n", csock, s_out); - - } else { - if (db) usleep(50*1000); - if (db) rfbLog("raw_xfer start: %d <- %d\n", csock, s_in); - - while (1) { - n = read(s_in, buf, sz); - if (n == 0 || (n < 0 && errno != EINTR) ) { - break; - } else if (n > 0) { - int len = n; - char *src = buf; - if (db > 1) write(2, buf, n); - while (len > 0) { - m = write(csock, src, len); - if (m > 0) { - src += m; - len -= m; - continue; - } - if (m < 0 && (errno == EINTR || errno == EAGAIN)) { - continue; - } - if (db) rfbLog("raw_xfer bad write: %d <- %d | %d/%d errno=%d\n", csock, s_in, m, n, errno); - break; - } - } - } - usleep(250*1000); - kill(par, SIGTERM); - waitpid(par, &status, WNOHANG); - if (db) rfbLog("raw_xfer done: %d <- %d\n", csock, s_in); - } - close(csock); - close(s_in); - close(s_out); -#endif /* FORK_OK */ -} - -/* compile with -DENC_HAVE_OPENSSL=0 to disable enc stuff but still have ssl */ - -#define ENC_MODULE - -#if LIBVNCSERVER_HAVE_LIBSSL -#ifndef ENC_HAVE_OPENSSL -#define ENC_HAVE_OPENSSL 1 -#endif -#else -#define ENC_HAVE_OPENSSL 0 -#endif - -#define ENC_DISABLE_SHOW_CERT - -#include "enc.h" - -static void symmetric_encryption_xfer(int csock, int s_in, int s_out) { - char tmp[100]; - char *cipher, *keyfile, *q; - - if (! enc_str) { - return; - } - cipher = (char *) malloc(strlen(enc_str) + 100); - q = strchr(enc_str, ':'); - if (!q) return; - *q = '\0'; - if (getenv("X11VNC_USE_ULTRADSM_IV")) { - sprintf(cipher, "rev:%s", enc_str); - } else { - sprintf(cipher, "noultra:rev:%s", enc_str); - } - keyfile = strdup(q+1); - *q = ':'; - - - /* TBD: s_in != s_out */ - if (s_out) {} - - sprintf(tmp, "fd=%d,%d", s_in, csock); - - enc_do(cipher, keyfile, "-1", tmp); -} - |
