X-Git-Url: http://andersk.mit.edu/gitweb/openssh.git/blobdiff_plain/f095fcc73b54270bf4e7cac5603fb1bb19cb5a4c..HEAD:/ssh-add.c diff --git a/ssh-add.c b/ssh-add.c index 7788f10b..084478d7 100644 --- a/ssh-add.c +++ b/ssh-add.c @@ -1,327 +1,436 @@ +/* $OpenBSD: ssh-add.c,v 1.91 2009/08/27 17:44:52 djm Exp $ */ /* + * Author: Tatu Ylonen + * Copyright (c) 1995 Tatu Ylonen , 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. + */ -ssh-add.c +#include "includes.h" -Author: Tatu Ylonen +#include +#include +#include -Copyright (c) 1995 Tatu Ylonen , Espoo, Finland - All rights reserved +#include +#include "openbsd-compat/openssl-compat.h" -Created: Thu Apr 6 00:52:24 1995 ylo +#include +#include +#include +#include +#include +#include +#include -Adds an identity to the authentication server, or removes an identity. +#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; -#include "includes.h" -RCSID("$Id$"); +/* Default files to add */ +static char *default_files[] = { + _PATH_SSH_CLIENT_ID_RSA, + _PATH_SSH_CLIENT_ID_DSA, + _PATH_SSH_CLIENT_IDENTITY, + NULL +}; -#include "rsa.h" -#include "ssh.h" -#include "xmalloc.h" -#include "authfd.h" -#include "fingerprint.h" +/* Default lifetime (0 == forever) */ +static int lifetime = 0; -#ifdef USE_EXTERNAL_ASKPASS -int askpass(const char *filename, RSA *key, const char *saved_comment, char **comment); -#endif /* USE_EXTERNAL_ASKPASS */ +/* User has to confirm key use */ +static int confirm = 0; -#ifdef HAVE___PROGNAME -extern char *__progname; -#else /* HAVE___PROGNAME */ -const char *__progname = "ssh-add"; -#endif /* HAVE___PROGNAME */ +/* 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; + } +} -void +static int delete_file(AuthenticationConnection *ac, const char *filename) { - RSA *key; - char *comment; - - key = RSA_new(); - if (!load_public_key(filename, key, &comment)) - { - printf("Bad key file %s: %s\n", filename, strerror(errno)); - return; - } - - if (ssh_remove_identity(ac, key)) - fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment); - else - fprintf(stderr, "Could not remove identity: %s\n", filename); - RSA_free(key); - xfree(comment); + 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; } -void +/* Send a request to remove all identities. */ +static int delete_all(AuthenticationConnection *ac) { - /* Send a request to remove all identities. */ - if (ssh_remove_all_identities(ac)) - fprintf(stderr, "All identities removed.\n"); - else - fprintf(stderr, "Failed to remove all identitities.\n"); + 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; } -void +static int add_file(AuthenticationConnection *ac, const char *filename) { - RSA *key; - RSA *public_key; - char *saved_comment, *comment; - int success; - - key = RSA_new(); - public_key = RSA_new(); - if (!load_public_key(filename, public_key, &saved_comment)) - { - printf("Bad key file %s: %s\n", filename, strerror(errno)); - return; - } - RSA_free(public_key); - - /* At first, try empty passphrase */ - success = load_private_key(filename, "", key, &comment); - if (!success) { - printf("Need passphrase for %s (%s).\n", filename, saved_comment); - if (!isatty(STDIN_FILENO)) { -#ifdef USE_EXTERNAL_ASKPASS - int prompts = 3; - - while (prompts && !success) - { - success = askpass(filename, key, saved_comment, &comment); - prompts--; + Key *private; + char *comment = NULL; + char msg[1024]; + 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 has to confirm each use of the key\n"); + } else { + fprintf(stderr, "Could not add identity: %s\n", filename); + } + + 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 smartcard: ", 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 (!success) - { - xfree(saved_comment); - return; + } + 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; } -#else /* !USE_EXTERNAL_ASKPASS */ - xfree(saved_comment); - return; -#endif /* USE_EXTERNAL_ASKPASS */ - } - - while (!success) { - char *pass = read_passphrase("Enter passphrase: ", 1); - if (strcmp(pass, "") == 0){ - xfree(pass); - xfree(saved_comment); - return; - } - success = load_private_key(filename, pass, key, &comment); - memset(pass, 0, strlen(pass)); - xfree(pass); - if (success) - break; - printf("Bad passphrase.\n"); - } - } - xfree(saved_comment); - - if (ssh_add_identity(ac, key, comment)) - fprintf(stderr, "Identity added: %s (%s)\n", filename, comment); - else - fprintf(stderr, "Could not add identity: %s\n", filename); - RSA_free(key); - xfree(comment); + 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); } -void -list_identities(AuthenticationConnection *ac, int fp) +static int +do_file(AuthenticationConnection *ac, int deleting, char *file) { - BIGNUM *e, *n; - int status; - char *comment; - int had_identities; - - e = BN_new(); - n = BN_new(); - had_identities = 0; - for (status = ssh_get_first_identity(ac, e, n, &comment); - status; - status = ssh_get_next_identity(ac, e, n, &comment)) - { - unsigned int bits = BN_num_bits(n); - had_identities = 1; - if (fp) { - printf("%d %s %s\n", bits, fingerprint(e, n), comment); - } else { - char *ebuf, *nbuf; - ebuf = BN_bn2dec(e); - if (ebuf == NULL) { - error("list_identities: BN_bn2dec(e) failed."); - }else{ - nbuf = BN_bn2dec(n); - if (nbuf == NULL) { - error("list_identities: BN_bn2dec(n) failed."); - }else{ - printf("%d %s %s %s\n", bits, ebuf, nbuf, comment); - free(nbuf); - } - free(ebuf); + if (deleting) { + if (delete_file(ac, file) == -1) + return -1; + } else { + if (add_file(ac, file) == -1) + return -1; } - } - xfree(comment); - } - BN_clear_free(e); - BN_clear_free(n); - if (!had_identities) - printf("The agent has no identities.\n"); + 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"); +#ifdef SMARTCARD + fprintf(stderr, " -s reader Add key in smartcard reader.\n"); + fprintf(stderr, " -e reader Remove key in smartcard reader.\n"); +#endif } int main(int argc, char **argv) { - AuthenticationConnection *ac = NULL; - struct passwd *pw; - char buf[1024]; - int no_files = 1; - int i; - int deleting = 0; - - /* check if RSA support exists */ - if (rsa_alive() == 0) { - extern char *__progname; - - fprintf(stderr, - "%s: no RSA support in libssl and libcrypto. See ssl(8).\n", - __progname); - exit(1); - } - - /* 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(1); - } - - for (i = 1; i < argc; i++) - { - if ((strcmp(argv[i], "-l") == 0) || - (strcmp(argv[i], "-L") == 0)) - { - list_identities(ac, argv[i][1] == 'l' ? 1 : 0); - no_files = 0; /* Don't default-add/delete if -l. */ - continue; + extern char *optarg; + extern int optind; + AuthenticationConnection *ac = NULL; + char *sc_reader_id = 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(); + + SSLeay_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); } - if (strcmp(argv[i], "-d") == 0) - { - deleting = 1; - continue; + 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': + sc_reader_id = optarg; + break; + case 'e': + deleting = 1; + sc_reader_id = 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; + } } - if (strcmp(argv[i], "-D") == 0) - { - delete_all(ac); - no_files = 0; - continue; + argc -= optind; + argv += optind; + if (sc_reader_id != NULL) { + if (update_card(ac, !deleting, sc_reader_id) == -1) + ret = 1; + goto done; } - no_files = 0; - if (deleting) - delete_file(ac, argv[i]); - else - add_file(ac, argv[i]); - } - if (no_files) - { - pw = getpwuid(getuid()); - if (!pw) - { - fprintf(stderr, "No user found with uid %d\n", (int)getuid()); - ssh_close_authentication_connection(ac); - exit(1); + 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; + } } - snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir, SSH_CLIENT_IDENTITY); - if (deleting) - delete_file(ac, buf); - else - add_file(ac, buf); - } - ssh_close_authentication_connection(ac); - exit(0); -} + clear_pass(); -#ifdef USE_EXTERNAL_ASKPASS -int askpass(const char *filename, RSA *key, const char *saved_comment, char **comment) -{ - int pipes[2]; - char buf[1024]; - int tmp; - pid_t child; - FILE *pipef; - - /* Check that we are X11-capable */ - if (getenv("DISPLAY") == NULL) - exit(1); - - if (pipe(pipes) == -1) { - fprintf(stderr, "Creating pipes failed: %s\n", strerror(errno)); - exit(1); - } - - if (fflush(NULL) == EOF) { - fprintf(stderr, "Cannot flush buffers: %s\n", strerror(errno)); - exit(1); - } - - child = fork(); - if (child == -1) { - fprintf(stderr, "Cannot fork: %s\n", strerror(errno)); - exit(1); - } - - if (child == 0) { - /* In child */ - - close(pipes[0]); - if (dup2(pipes[1], 1) ==-1) { - fprintf(stderr, "dup2 failed: %s\n", strerror(errno)); - exit(1); - } - - tmp = snprintf(buf, sizeof(buf), "Need passphrase for %s (%s)", filename, saved_comment); - /* skip the prompt if it won't fit */ - if ((tmp < 0) || (tmp >= sizeof(buf))) - tmp = execlp(ASKPASS_PROGRAM, "ssh-askpass", 0); - else - tmp = execlp(ASKPASS_PROGRAM, "ssh-askpass", buf, 0); - - /* Shouldn't get this far */ - fprintf(stderr, "Executing ssh-askpass failed: %s\n", strerror(errno)); - exit(1); - } - - /* In parent */ - close(pipes[1]); - - if ((pipef = fdopen(pipes[0], "r")) == NULL) { - fprintf(stderr, "fdopen failed: %s\n", strerror(errno)); - exit(1); - } - - /* Read passphrase back from child, abort if none presented */ - if(fgets(buf, sizeof(buf), pipef) == NULL) - exit(1); - - fclose(pipef); - - if (strchr(buf, '\n')) - *strchr(buf, '\n') = 0; - - if (waitpid(child, NULL, 0) == -1) { - fprintf(stderr, "Waiting for child failed: %s\n", - strerror(errno)); - exit(1); - } - - /* Try password as it was presented */ - tmp = load_private_key(filename, buf, key, comment); - - memset(buf, 0, sizeof(buf)); - - return(tmp); +done: + ssh_close_authentication_connection(ac); + return ret; } -#endif /* USE_EXTERNAL_ASKPASS */