diff options
Diffstat (limited to 'crypto/openssh/ssh-add.c')
-rw-r--r-- | crypto/openssh/ssh-add.c | 472 |
1 files changed, 472 insertions, 0 deletions
diff --git a/crypto/openssh/ssh-add.c b/crypto/openssh/ssh-add.c new file mode 100644 index 0000000..125d664 --- /dev/null +++ b/crypto/openssh/ssh-add.c @@ -0,0 +1,472 @@ +/* $OpenBSD: ssh-add.c,v 1.100 2010/08/31 12:33:38 djm Exp $ */ +/* + * Author: Tatu Ylonen <ylo@cs.hut.fi> + * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland + * All rights reserved + * Adds an identity to the authentication server, or removes an identity. + * + * As far as I am concerned, the code I have written for this software + * can be used freely for any purpose. Any derived versions of this + * software must be clearly marked as such, and if the derived work is + * incompatible with the protocol description in the RFC file, it must be + * called by a name other than "ssh" or "Secure Shell". + * + * SSH2 implementation, + * Copyright (c) 2000, 2001 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 <sys/types.h> +#include <sys/stat.h> +#include <sys/param.h> + +#include <openssl/evp.h> +#include "openbsd-compat/openssl-compat.h" + +#include <fcntl.h> +#include <pwd.h> +#include <stdarg.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include "xmalloc.h" +#include "ssh.h" +#include "rsa.h" +#include "log.h" +#include "key.h" +#include "buffer.h" +#include "authfd.h" +#include "authfile.h" +#include "pathnames.h" +#include "misc.h" + +/* argv0 */ +extern char *__progname; + +/* Default files to add */ +static char *default_files[] = { + _PATH_SSH_CLIENT_ID_RSA, + _PATH_SSH_CLIENT_ID_DSA, +#ifdef OPENSSL_HAS_ECC + _PATH_SSH_CLIENT_ID_ECDSA, +#endif + _PATH_SSH_CLIENT_IDENTITY, + NULL +}; + +/* Default lifetime (0 == forever) */ +static int lifetime = 0; + +/* User has to confirm key use */ +static int confirm = 0; + +/* we keep a cache of one passphrases */ +static char *pass = NULL; +static void +clear_pass(void) +{ + if (pass) { + memset(pass, 0, strlen(pass)); + xfree(pass); + pass = NULL; + } +} + +static int +delete_file(AuthenticationConnection *ac, const char *filename) +{ + Key *public; + char *comment = NULL; + int ret = -1; + + public = key_load_public(filename, &comment); + if (public == NULL) { + printf("Bad key file %s\n", filename); + return -1; + } + if (ssh_remove_identity(ac, public)) { + fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment); + ret = 0; + } else + fprintf(stderr, "Could not remove identity: %s\n", filename); + + key_free(public); + xfree(comment); + + return ret; +} + +/* Send a request to remove all identities. */ +static int +delete_all(AuthenticationConnection *ac) +{ + int ret = -1; + + if (ssh_remove_all_identities(ac, 1)) + ret = 0; + /* ignore error-code for ssh2 */ + ssh_remove_all_identities(ac, 2); + + if (ret == 0) + fprintf(stderr, "All identities removed.\n"); + else + fprintf(stderr, "Failed to remove all identities.\n"); + + return ret; +} + +static int +add_file(AuthenticationConnection *ac, const char *filename) +{ + Key *private, *cert; + char *comment = NULL; + char msg[1024], *certpath; + int fd, perms_ok, ret = -1; + + if ((fd = open(filename, O_RDONLY)) < 0) { + perror(filename); + return -1; + } + + /* + * Since we'll try to load a keyfile multiple times, permission errors + * will occur multiple times, so check perms first and bail if wrong. + */ + perms_ok = key_perm_ok(fd, filename); + close(fd); + if (!perms_ok) + return -1; + + /* At first, try empty passphrase */ + private = key_load_private(filename, "", &comment); + if (comment == NULL) + comment = xstrdup(filename); + /* try last */ + if (private == NULL && pass != NULL) + private = key_load_private(filename, pass, NULL); + if (private == NULL) { + /* clear passphrase since it did not work */ + clear_pass(); + snprintf(msg, sizeof msg, "Enter passphrase for %.200s: ", + comment); + for (;;) { + pass = read_passphrase(msg, RP_ALLOW_STDIN); + if (strcmp(pass, "") == 0) { + clear_pass(); + xfree(comment); + return -1; + } + private = key_load_private(filename, pass, &comment); + if (private != NULL) + break; + clear_pass(); + snprintf(msg, sizeof msg, + "Bad passphrase, try again for %.200s: ", comment); + } + } + + if (ssh_add_identity_constrained(ac, private, comment, lifetime, + confirm)) { + fprintf(stderr, "Identity added: %s (%s)\n", filename, comment); + ret = 0; + if (lifetime != 0) + fprintf(stderr, + "Lifetime set to %d seconds\n", lifetime); + if (confirm != 0) + fprintf(stderr, + "The user must confirm each use of the key\n"); + } else { + fprintf(stderr, "Could not add identity: %s\n", filename); + } + + + /* Now try to add the certificate flavour too */ + xasprintf(&certpath, "%s-cert.pub", filename); + if ((cert = key_load_public(certpath, NULL)) == NULL) + goto out; + + if (!key_equal_public(cert, private)) { + error("Certificate %s does not match private key %s", + certpath, filename); + key_free(cert); + goto out; + } + + /* Graft with private bits */ + if (key_to_certified(private, key_cert_is_legacy(cert)) != 0) { + error("%s: key_to_certified failed", __func__); + key_free(cert); + goto out; + } + key_cert_copy(cert, private); + key_free(cert); + + if (!ssh_add_identity_constrained(ac, private, comment, + lifetime, confirm)) { + error("Certificate %s (%s) add failed", certpath, + private->cert->key_id); + } + fprintf(stderr, "Certificate added: %s (%s)\n", certpath, + private->cert->key_id); + if (lifetime != 0) + fprintf(stderr, "Lifetime set to %d seconds\n", lifetime); + if (confirm != 0) + fprintf(stderr, "The user must confirm each use of the key\n"); + out: + xfree(certpath); + xfree(comment); + key_free(private); + + return ret; +} + +static int +update_card(AuthenticationConnection *ac, int add, const char *id) +{ + char *pin; + int ret = -1; + + pin = read_passphrase("Enter passphrase for PKCS#11: ", RP_ALLOW_STDIN); + if (pin == NULL) + return -1; + + if (ssh_update_card(ac, add, id, pin, lifetime, confirm)) { + fprintf(stderr, "Card %s: %s\n", + add ? "added" : "removed", id); + ret = 0; + } else { + fprintf(stderr, "Could not %s card: %s\n", + add ? "add" : "remove", id); + ret = -1; + } + xfree(pin); + return ret; +} + +static int +list_identities(AuthenticationConnection *ac, int do_fp) +{ + Key *key; + char *comment, *fp; + int had_identities = 0; + int version; + + for (version = 1; version <= 2; version++) { + for (key = ssh_get_first_identity(ac, &comment, version); + key != NULL; + key = ssh_get_next_identity(ac, &comment, version)) { + had_identities = 1; + if (do_fp) { + fp = key_fingerprint(key, SSH_FP_MD5, + SSH_FP_HEX); + printf("%d %s %s (%s)\n", + key_size(key), fp, comment, key_type(key)); + xfree(fp); + } else { + if (!key_write(key, stdout)) + fprintf(stderr, "key_write failed"); + fprintf(stdout, " %s\n", comment); + } + key_free(key); + xfree(comment); + } + } + if (!had_identities) { + printf("The agent has no identities.\n"); + return -1; + } + return 0; +} + +static int +lock_agent(AuthenticationConnection *ac, int lock) +{ + char prompt[100], *p1, *p2; + int passok = 1, ret = -1; + + strlcpy(prompt, "Enter lock password: ", sizeof(prompt)); + p1 = read_passphrase(prompt, RP_ALLOW_STDIN); + if (lock) { + strlcpy(prompt, "Again: ", sizeof prompt); + p2 = read_passphrase(prompt, RP_ALLOW_STDIN); + if (strcmp(p1, p2) != 0) { + fprintf(stderr, "Passwords do not match.\n"); + passok = 0; + } + memset(p2, 0, strlen(p2)); + xfree(p2); + } + if (passok && ssh_lock_agent(ac, lock, p1)) { + fprintf(stderr, "Agent %slocked.\n", lock ? "" : "un"); + ret = 0; + } else + fprintf(stderr, "Failed to %slock agent.\n", lock ? "" : "un"); + memset(p1, 0, strlen(p1)); + xfree(p1); + return (ret); +} + +static int +do_file(AuthenticationConnection *ac, int deleting, char *file) +{ + if (deleting) { + if (delete_file(ac, file) == -1) + return -1; + } else { + if (add_file(ac, file) == -1) + return -1; + } + return 0; +} + +static void +usage(void) +{ + fprintf(stderr, "usage: %s [options] [file ...]\n", __progname); + fprintf(stderr, "Options:\n"); + fprintf(stderr, " -l List fingerprints of all identities.\n"); + fprintf(stderr, " -L List public key parameters of all identities.\n"); + fprintf(stderr, " -d Delete identity.\n"); + fprintf(stderr, " -D Delete all identities.\n"); + fprintf(stderr, " -x Lock agent.\n"); + fprintf(stderr, " -X Unlock agent.\n"); + fprintf(stderr, " -t life Set lifetime (in seconds) when adding identities.\n"); + fprintf(stderr, " -c Require confirmation to sign using identities\n"); + fprintf(stderr, " -s pkcs11 Add keys from PKCS#11 provider.\n"); + fprintf(stderr, " -e pkcs11 Remove keys provided by PKCS#11 provider.\n"); +} + +int +main(int argc, char **argv) +{ + extern char *optarg; + extern int optind; + AuthenticationConnection *ac = NULL; + char *pkcs11provider = NULL; + int i, ch, deleting = 0, ret = 0; + + /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ + sanitise_stdfd(); + + __progname = ssh_get_progname(argv[0]); + init_rng(); + seed_rng(); + + OpenSSL_add_all_algorithms(); + + /* At first, get a connection to the authentication agent. */ + ac = ssh_get_authentication_connection(); + if (ac == NULL) { + fprintf(stderr, + "Could not open a connection to your authentication agent.\n"); + exit(2); + } + while ((ch = getopt(argc, argv, "lLcdDxXe:s:t:")) != -1) { + switch (ch) { + case 'l': + case 'L': + if (list_identities(ac, ch == 'l' ? 1 : 0) == -1) + ret = 1; + goto done; + case 'x': + case 'X': + if (lock_agent(ac, ch == 'x' ? 1 : 0) == -1) + ret = 1; + goto done; + case 'c': + confirm = 1; + break; + case 'd': + deleting = 1; + break; + case 'D': + if (delete_all(ac) == -1) + ret = 1; + goto done; + case 's': + pkcs11provider = optarg; + break; + case 'e': + deleting = 1; + pkcs11provider = optarg; + break; + case 't': + if ((lifetime = convtime(optarg)) == -1) { + fprintf(stderr, "Invalid lifetime\n"); + ret = 1; + goto done; + } + break; + default: + usage(); + ret = 1; + goto done; + } + } + argc -= optind; + argv += optind; + if (pkcs11provider != NULL) { + if (update_card(ac, !deleting, pkcs11provider) == -1) + ret = 1; + goto done; + } + if (argc == 0) { + char buf[MAXPATHLEN]; + struct passwd *pw; + struct stat st; + int count = 0; + + if ((pw = getpwuid(getuid())) == NULL) { + fprintf(stderr, "No user found with uid %u\n", + (u_int)getuid()); + ret = 1; + goto done; + } + + for (i = 0; default_files[i]; i++) { + snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir, + default_files[i]); + if (stat(buf, &st) < 0) + continue; + if (do_file(ac, deleting, buf) == -1) + ret = 1; + else + count++; + } + if (count == 0) + ret = 1; + } else { + for (i = 0; i < argc; i++) { + if (do_file(ac, deleting, argv[i]) == -1) + ret = 1; + } + } + clear_pass(); + +done: + ssh_close_authentication_connection(ac); + return ret; +} |