/* * 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" RCSID("$OpenBSD: ssh-add.c,v 1.70 2004/05/08 00:21:31 djm Exp $"); #include <openssl/evp.h> #include "ssh.h" #include "rsa.h" #include "log.h" #include "xmalloc.h" #include "key.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, _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) { struct stat st; Key *private; char *comment = NULL; char msg[1024]; int ret = -1; if (stat(filename, &st) < 0) { perror(filename); 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 if (ssh_add_identity(ac, private, comment)) { fprintf(stderr, "Identity added: %s (%s)\n", filename, comment); ret = 0; } 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 (!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]\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) { extern char *optarg; extern int optind; AuthenticationConnection *ac = NULL; char *sc_reader_id = NULL; int i, ch, deleting = 0, ret = 0; 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); } 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; break; case 'x': case 'X': if (lock_agent(ac, ch == 'x' ? 1 : 0) == -1) ret = 1; goto done; break; case 'c': confirm = 1; break; case 'd': deleting = 1; break; case 'D': if (delete_all(ac) == -1) ret = 1; goto done; break; 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; } } argc -= optind; argv += optind; if (sc_reader_id != NULL) { if (update_card(ac, !deleting, sc_reader_id) == -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; }