diff options
Diffstat (limited to 'crypto/openssh/ssh-keysign.c')
| -rw-r--r-- | crypto/openssh/ssh-keysign.c | 254 |
1 files changed, 0 insertions, 254 deletions
diff --git a/crypto/openssh/ssh-keysign.c b/crypto/openssh/ssh-keysign.c deleted file mode 100644 index c4bc7e5..0000000 --- a/crypto/openssh/ssh-keysign.c +++ /dev/null @@ -1,254 +0,0 @@ -/* $OpenBSD: ssh-keysign.c,v 1.29 2006/08/03 03:34:42 deraadt Exp $ */ -/* - * Copyright (c) 2002 Markus Friedl. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * - * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR - * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES - * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. - * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, - * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT - * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF - * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -#include "includes.h" - -#include <fcntl.h> -#ifdef HAVE_PATHS_H -#include <paths.h> -#endif -#include <pwd.h> -#include <stdarg.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> - -#include <openssl/evp.h> -#include <openssl/rand.h> -#include <openssl/rsa.h> - -#include "xmalloc.h" -#include "log.h" -#include "key.h" -#include "ssh.h" -#include "ssh2.h" -#include "misc.h" -#include "buffer.h" -#include "authfile.h" -#include "msg.h" -#include "canohost.h" -#include "pathnames.h" -#include "readconf.h" -#include "uidswap.h" - -/* XXX readconf.c needs these */ -uid_t original_real_uid; - -extern char *__progname; - -static int -valid_request(struct passwd *pw, char *host, Key **ret, u_char *data, - u_int datalen) -{ - Buffer b; - Key *key = NULL; - u_char *pkblob; - u_int blen, len; - char *pkalg, *p; - int pktype, fail; - - fail = 0; - - buffer_init(&b); - buffer_append(&b, data, datalen); - - /* session id, currently limited to SHA1 (20 bytes) or SHA256 (32) */ - p = buffer_get_string(&b, &len); - if (len != 20 && len != 32) - fail++; - xfree(p); - - if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) - fail++; - - /* server user */ - buffer_skip_string(&b); - - /* service */ - p = buffer_get_string(&b, NULL); - if (strcmp("ssh-connection", p) != 0) - fail++; - xfree(p); - - /* method */ - p = buffer_get_string(&b, NULL); - if (strcmp("hostbased", p) != 0) - fail++; - xfree(p); - - /* pubkey */ - pkalg = buffer_get_string(&b, NULL); - pkblob = buffer_get_string(&b, &blen); - - pktype = key_type_from_name(pkalg); - if (pktype == KEY_UNSPEC) - fail++; - else if ((key = key_from_blob(pkblob, blen)) == NULL) - fail++; - else if (key->type != pktype) - fail++; - xfree(pkalg); - xfree(pkblob); - - /* client host name, handle trailing dot */ - p = buffer_get_string(&b, &len); - debug2("valid_request: check expect chost %s got %s", host, p); - if (strlen(host) != len - 1) - fail++; - else if (p[len - 1] != '.') - fail++; - else if (strncasecmp(host, p, len - 1) != 0) - fail++; - xfree(p); - - /* local user */ - p = buffer_get_string(&b, NULL); - - if (strcmp(pw->pw_name, p) != 0) - fail++; - xfree(p); - - /* end of message */ - if (buffer_len(&b) != 0) - fail++; - buffer_free(&b); - - debug3("valid_request: fail %d", fail); - - if (fail && key != NULL) - key_free(key); - else - *ret = key; - - return (fail ? -1 : 0); -} - -int -main(int argc, char **argv) -{ - Buffer b; - Options options; - Key *keys[2], *key = NULL; - struct passwd *pw; - int key_fd[2], i, found, version = 2, fd; - u_char *signature, *data; - char *host; - u_int slen, dlen; - u_int32_t rnd[256]; - - /* Ensure that stdin and stdout are connected */ - if ((fd = open(_PATH_DEVNULL, O_RDWR)) < 2) - exit(1); - /* Leave /dev/null fd iff it is attached to stderr */ - if (fd > 2) - close(fd); - - key_fd[0] = open(_PATH_HOST_RSA_KEY_FILE, O_RDONLY); - key_fd[1] = open(_PATH_HOST_DSA_KEY_FILE, O_RDONLY); - - original_real_uid = getuid(); /* XXX readconf.c needs this */ - if ((pw = getpwuid(original_real_uid)) == NULL) - fatal("getpwuid failed"); - pw = pwcopy(pw); - - permanently_set_uid(pw); - - init_rng(); - seed_rng(); - arc4random_stir(); - -#ifdef DEBUG_SSH_KEYSIGN - log_init("ssh-keysign", SYSLOG_LEVEL_DEBUG3, SYSLOG_FACILITY_AUTH, 0); -#endif - - /* verify that ssh-keysign is enabled by the admin */ - initialize_options(&options); - (void)read_config_file(_PATH_HOST_CONFIG_FILE, "", &options, 0); - fill_default_options(&options); - if (options.enable_ssh_keysign != 1) - fatal("ssh-keysign not enabled in %s", - _PATH_HOST_CONFIG_FILE); - - if (key_fd[0] == -1 && key_fd[1] == -1) - fatal("could not open any host key"); - - SSLeay_add_all_algorithms(); - for (i = 0; i < 256; i++) - rnd[i] = arc4random(); - RAND_seed(rnd, sizeof(rnd)); - - found = 0; - for (i = 0; i < 2; i++) { - keys[i] = NULL; - if (key_fd[i] == -1) - continue; - keys[i] = key_load_private_pem(key_fd[i], KEY_UNSPEC, - NULL, NULL); - close(key_fd[i]); - if (keys[i] != NULL) - found = 1; - } - if (!found) - fatal("no hostkey found"); - - buffer_init(&b); - if (ssh_msg_recv(STDIN_FILENO, &b) < 0) - fatal("ssh_msg_recv failed"); - if (buffer_get_char(&b) != version) - fatal("bad version"); - fd = buffer_get_int(&b); - if ((fd == STDIN_FILENO) || (fd == STDOUT_FILENO)) - fatal("bad fd"); - if ((host = get_local_name(fd)) == NULL) - fatal("cannot get sockname for fd"); - - data = buffer_get_string(&b, &dlen); - if (valid_request(pw, host, &key, data, dlen) < 0) - fatal("not a valid request"); - xfree(host); - - found = 0; - for (i = 0; i < 2; i++) { - if (keys[i] != NULL && - key_equal(key, keys[i])) { - found = 1; - break; - } - } - if (!found) - fatal("no matching hostkey found"); - - if (key_sign(keys[i], &signature, &slen, data, dlen) != 0) - fatal("key_sign failed"); - xfree(data); - - /* send reply */ - buffer_clear(&b); - buffer_put_string(&b, signature, slen); - if (ssh_msg_send(STDOUT_FILENO, version, &b) == -1) - fatal("ssh_msg_send failed"); - - return (0); -} |
