| /* $OpenBSD: ssh-add.c,v 1.167 2023/03/08 00:05:58 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> |
| |
| #ifdef WITH_OPENSSL |
| # include <openssl/evp.h> |
| # include "openbsd-compat/openssl-compat.h" |
| #endif |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <pwd.h> |
| #include <stdarg.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| #include <limits.h> |
| |
| #include "xmalloc.h" |
| #include "ssh.h" |
| #include "log.h" |
| #include "sshkey.h" |
| #include "sshbuf.h" |
| #include "authfd.h" |
| #include "authfile.h" |
| #include "pathnames.h" |
| #include "misc.h" |
| #include "ssherr.h" |
| #include "digest.h" |
| #include "ssh-sk.h" |
| #include "sk-api.h" |
| #include "hostfile.h" |
| |
| /* argv0 */ |
| extern char *__progname; |
| |
| /* Default files to add */ |
| static char *default_files[] = { |
| #ifdef WITH_OPENSSL |
| _PATH_SSH_CLIENT_ID_RSA, |
| #ifdef OPENSSL_HAS_ECC |
| _PATH_SSH_CLIENT_ID_ECDSA, |
| _PATH_SSH_CLIENT_ID_ECDSA_SK, |
| #endif |
| #endif /* WITH_OPENSSL */ |
| _PATH_SSH_CLIENT_ID_ED25519, |
| _PATH_SSH_CLIENT_ID_ED25519_SK, |
| _PATH_SSH_CLIENT_ID_XMSS, |
| _PATH_SSH_CLIENT_ID_DSA, |
| NULL |
| }; |
| |
| static int fingerprint_hash = SSH_FP_HASH_DEFAULT; |
| |
| /* Default lifetime (0 == forever) */ |
| static int lifetime = 0; |
| |
| /* User has to confirm key use */ |
| static int confirm = 0; |
| |
| /* Maximum number of signatures (XMSS) */ |
| static u_int maxsign = 0; |
| static u_int minleft = 0; |
| |
| /* we keep a cache of one passphrase */ |
| static char *pass = NULL; |
| static void |
| clear_pass(void) |
| { |
| if (pass) { |
| freezero(pass, strlen(pass)); |
| pass = NULL; |
| } |
| } |
| |
| static int |
| delete_one(int agent_fd, const struct sshkey *key, const char *comment, |
| const char *path, int qflag) |
| { |
| int r; |
| |
| if ((r = ssh_remove_identity(agent_fd, key)) != 0) { |
| fprintf(stderr, "Could not remove identity \"%s\": %s\n", |
| path, ssh_err(r)); |
| return r; |
| } |
| if (!qflag) { |
| fprintf(stderr, "Identity removed: %s %s (%s)\n", path, |
| sshkey_type(key), comment ? comment : "no comment"); |
| } |
| return 0; |
| } |
| |
| static int |
| delete_stdin(int agent_fd, int qflag) |
| { |
| char *line = NULL, *cp; |
| size_t linesize = 0; |
| struct sshkey *key = NULL; |
| int lnum = 0, r, ret = -1; |
| |
| while (getline(&line, &linesize, stdin) != -1) { |
| lnum++; |
| sshkey_free(key); |
| key = NULL; |
| line[strcspn(line, "\n")] = '\0'; |
| cp = line + strspn(line, " \t"); |
| if (*cp == '#' || *cp == '\0') |
| continue; |
| if ((key = sshkey_new(KEY_UNSPEC)) == NULL) |
| fatal_f("sshkey_new"); |
| if ((r = sshkey_read(key, &cp)) != 0) { |
| error_r(r, "(stdin):%d: invalid key", lnum); |
| continue; |
| } |
| if (delete_one(agent_fd, key, cp, "(stdin)", qflag) == 0) |
| ret = 0; |
| } |
| sshkey_free(key); |
| free(line); |
| return ret; |
| } |
| |
| static int |
| delete_file(int agent_fd, const char *filename, int key_only, int qflag) |
| { |
| struct sshkey *public, *cert = NULL; |
| char *certpath = NULL, *comment = NULL; |
| int r, ret = -1; |
| |
| if (strcmp(filename, "-") == 0) |
| return delete_stdin(agent_fd, qflag); |
| |
| if ((r = sshkey_load_public(filename, &public, &comment)) != 0) { |
| printf("Bad key file %s: %s\n", filename, ssh_err(r)); |
| return -1; |
| } |
| if (delete_one(agent_fd, public, comment, filename, qflag) == 0) |
| ret = 0; |
| |
| if (key_only) |
| goto out; |
| |
| /* Now try to delete the corresponding certificate too */ |
| free(comment); |
| comment = NULL; |
| xasprintf(&certpath, "%s-cert.pub", filename); |
| if ((r = sshkey_load_public(certpath, &cert, &comment)) != 0) { |
| if (r != SSH_ERR_SYSTEM_ERROR || errno != ENOENT) |
| error_r(r, "Failed to load certificate \"%s\"", certpath); |
| goto out; |
| } |
| |
| if (!sshkey_equal_public(cert, public)) |
| fatal("Certificate %s does not match private key %s", |
| certpath, filename); |
| |
| if (delete_one(agent_fd, cert, comment, certpath, qflag) == 0) |
| ret = 0; |
| |
| out: |
| sshkey_free(cert); |
| sshkey_free(public); |
| free(certpath); |
| free(comment); |
| |
| return ret; |
| } |
| |
| /* Send a request to remove all identities. */ |
| static int |
| delete_all(int agent_fd, int qflag) |
| { |
| int ret = -1; |
| |
| /* |
| * Since the agent might be forwarded, old or non-OpenSSH, when asked |
| * to remove all keys, attempt to remove both protocol v.1 and v.2 |
| * keys. |
| */ |
| if (ssh_remove_all_identities(agent_fd, 2) == 0) |
| ret = 0; |
| /* ignore error-code for ssh1 */ |
| ssh_remove_all_identities(agent_fd, 1); |
| |
| if (ret != 0) |
| fprintf(stderr, "Failed to remove all identities.\n"); |
| else if (!qflag) |
| fprintf(stderr, "All identities removed.\n"); |
| |
| return ret; |
| } |
| |
| static int |
| add_file(int agent_fd, const char *filename, int key_only, int qflag, |
| const char *skprovider, struct dest_constraint **dest_constraints, |
| size_t ndest_constraints) |
| { |
| struct sshkey *private, *cert; |
| char *comment = NULL; |
| char msg[1024], *certpath = NULL; |
| int r, fd, ret = -1; |
| size_t i; |
| u_int32_t left; |
| struct sshbuf *keyblob; |
| struct ssh_identitylist *idlist; |
| |
| if (strcmp(filename, "-") == 0) { |
| fd = STDIN_FILENO; |
| filename = "(stdin)"; |
| } else if ((fd = open(filename, O_RDONLY)) == -1) { |
| 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. |
| */ |
| if (fd != STDIN_FILENO) { |
| if (sshkey_perm_ok(fd, filename) != 0) { |
| close(fd); |
| return -1; |
| } |
| } |
| if ((r = sshbuf_load_fd(fd, &keyblob)) != 0) { |
| fprintf(stderr, "Error loading key \"%s\": %s\n", |
| filename, ssh_err(r)); |
| sshbuf_free(keyblob); |
| close(fd); |
| return -1; |
| } |
| close(fd); |
| |
| /* At first, try empty passphrase */ |
| if ((r = sshkey_parse_private_fileblob(keyblob, "", &private, |
| &comment)) != 0 && r != SSH_ERR_KEY_WRONG_PASSPHRASE) { |
| fprintf(stderr, "Error loading key \"%s\": %s\n", |
| filename, ssh_err(r)); |
| goto fail_load; |
| } |
| /* try last */ |
| if (private == NULL && pass != NULL) { |
| if ((r = sshkey_parse_private_fileblob(keyblob, pass, &private, |
| &comment)) != 0 && r != SSH_ERR_KEY_WRONG_PASSPHRASE) { |
| fprintf(stderr, "Error loading key \"%s\": %s\n", |
| filename, ssh_err(r)); |
| goto fail_load; |
| } |
| } |
| if (private == NULL) { |
| /* clear passphrase since it did not work */ |
| clear_pass(); |
| snprintf(msg, sizeof msg, "Enter passphrase for %s%s: ", |
| filename, confirm ? " (will confirm each use)" : ""); |
| for (;;) { |
| pass = read_passphrase(msg, RP_ALLOW_STDIN); |
| if (strcmp(pass, "") == 0) |
| goto fail_load; |
| if ((r = sshkey_parse_private_fileblob(keyblob, pass, |
| &private, &comment)) == 0) |
| break; |
| else if (r != SSH_ERR_KEY_WRONG_PASSPHRASE) { |
| fprintf(stderr, |
| "Error loading key \"%s\": %s\n", |
| filename, ssh_err(r)); |
| fail_load: |
| clear_pass(); |
| sshbuf_free(keyblob); |
| return -1; |
| } |
| clear_pass(); |
| snprintf(msg, sizeof msg, |
| "Bad passphrase, try again for %s%s: ", filename, |
| confirm ? " (will confirm each use)" : ""); |
| } |
| } |
| if (comment == NULL || *comment == '\0') |
| comment = xstrdup(filename); |
| sshbuf_free(keyblob); |
| |
| /* For XMSS */ |
| if ((r = sshkey_set_filename(private, filename)) != 0) { |
| fprintf(stderr, "Could not add filename to private key: %s (%s)\n", |
| filename, comment); |
| goto out; |
| } |
| if (maxsign && minleft && |
| (r = ssh_fetch_identitylist(agent_fd, &idlist)) == 0) { |
| for (i = 0; i < idlist->nkeys; i++) { |
| if (!sshkey_equal_public(idlist->keys[i], private)) |
| continue; |
| left = sshkey_signatures_left(idlist->keys[i]); |
| if (left < minleft) { |
| fprintf(stderr, |
| "Only %d signatures left.\n", left); |
| break; |
| } |
| fprintf(stderr, "Skipping update: "); |
| if (left == minleft) { |
| fprintf(stderr, |
| "required signatures left (%d).\n", left); |
| } else { |
| fprintf(stderr, |
| "more signatures left (%d) than" |
| " required (%d).\n", left, minleft); |
| } |
| ssh_free_identitylist(idlist); |
| goto out; |
| } |
| ssh_free_identitylist(idlist); |
| } |
| |
| if (sshkey_is_sk(private)) { |
| if (skprovider == NULL) { |
| fprintf(stderr, "Cannot load FIDO key %s " |
| "without provider\n", filename); |
| goto out; |
| } |
| } else { |
| /* Don't send provider constraint for other keys */ |
| skprovider = NULL; |
| } |
| |
| if ((r = ssh_add_identity_constrained(agent_fd, private, comment, |
| lifetime, confirm, maxsign, skprovider, |
| dest_constraints, ndest_constraints)) == 0) { |
| ret = 0; |
| if (!qflag) { |
| fprintf(stderr, "Identity added: %s (%s)\n", |
| filename, comment); |
| 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\": %s\n", |
| filename, ssh_err(r)); |
| } |
| |
| /* Skip trying to load the cert if requested */ |
| if (key_only) |
| goto out; |
| |
| /* Now try to add the certificate flavour too */ |
| xasprintf(&certpath, "%s-cert.pub", filename); |
| if ((r = sshkey_load_public(certpath, &cert, NULL)) != 0) { |
| if (r != SSH_ERR_SYSTEM_ERROR || errno != ENOENT) |
| error_r(r, "Failed to load certificate \"%s\"", certpath); |
| goto out; |
| } |
| |
| if (!sshkey_equal_public(cert, private)) { |
| error("Certificate %s does not match private key %s", |
| certpath, filename); |
| sshkey_free(cert); |
| goto out; |
| } |
| |
| /* Graft with private bits */ |
| if ((r = sshkey_to_certified(private)) != 0) { |
| error_fr(r, "sshkey_to_certified"); |
| sshkey_free(cert); |
| goto out; |
| } |
| if ((r = sshkey_cert_copy(cert, private)) != 0) { |
| error_fr(r, "sshkey_cert_copy"); |
| sshkey_free(cert); |
| goto out; |
| } |
| sshkey_free(cert); |
| |
| if ((r = ssh_add_identity_constrained(agent_fd, private, comment, |
| lifetime, confirm, maxsign, skprovider, |
| dest_constraints, ndest_constraints)) != 0) { |
| error_r(r, "Certificate %s (%s) add failed", certpath, |
| private->cert->key_id); |
| goto out; |
| } |
| /* success */ |
| if (!qflag) { |
| 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: |
| free(certpath); |
| free(comment); |
| sshkey_free(private); |
| |
| return ret; |
| } |
| |
| static int |
| update_card(int agent_fd, int add, const char *id, int qflag, |
| struct dest_constraint **dest_constraints, size_t ndest_constraints) |
| { |
| char *pin = NULL; |
| int r, ret = -1; |
| |
| if (add) { |
| if ((pin = read_passphrase("Enter passphrase for PKCS#11: ", |
| RP_ALLOW_STDIN)) == NULL) |
| return -1; |
| } |
| |
| if ((r = ssh_update_card(agent_fd, add, id, pin == NULL ? "" : pin, |
| lifetime, confirm, dest_constraints, ndest_constraints)) == 0) { |
| ret = 0; |
| if (!qflag) { |
| fprintf(stderr, "Card %s: %s\n", |
| add ? "added" : "removed", id); |
| } |
| } else { |
| fprintf(stderr, "Could not %s card \"%s\": %s\n", |
| add ? "add" : "remove", id, ssh_err(r)); |
| ret = -1; |
| } |
| free(pin); |
| return ret; |
| } |
| |
| static int |
| test_key(int agent_fd, const char *filename) |
| { |
| struct sshkey *key = NULL; |
| u_char *sig = NULL; |
| const char *alg = NULL; |
| size_t slen = 0; |
| int r, ret = -1; |
| char data[1024]; |
| |
| if ((r = sshkey_load_public(filename, &key, NULL)) != 0) { |
| error_r(r, "Couldn't read public key %s", filename); |
| return -1; |
| } |
| if (sshkey_type_plain(key->type) == KEY_RSA) |
| alg = "rsa-sha2-256"; |
| arc4random_buf(data, sizeof(data)); |
| if ((r = ssh_agent_sign(agent_fd, key, &sig, &slen, data, sizeof(data), |
| alg, 0)) != 0) { |
| error_r(r, "Agent signature failed for %s", filename); |
| goto done; |
| } |
| if ((r = sshkey_verify(key, sig, slen, data, sizeof(data), |
| alg, 0, NULL)) != 0) { |
| error_r(r, "Signature verification failed for %s", filename); |
| goto done; |
| } |
| /* success */ |
| ret = 0; |
| done: |
| free(sig); |
| sshkey_free(key); |
| return ret; |
| } |
| |
| static int |
| list_identities(int agent_fd, int do_fp) |
| { |
| char *fp; |
| int r; |
| struct ssh_identitylist *idlist; |
| u_int32_t left; |
| size_t i; |
| |
| if ((r = ssh_fetch_identitylist(agent_fd, &idlist)) != 0) { |
| if (r != SSH_ERR_AGENT_NO_IDENTITIES) |
| fprintf(stderr, "error fetching identities: %s\n", |
| ssh_err(r)); |
| else |
| printf("The agent has no identities.\n"); |
| return -1; |
| } |
| for (i = 0; i < idlist->nkeys; i++) { |
| if (do_fp) { |
| fp = sshkey_fingerprint(idlist->keys[i], |
| fingerprint_hash, SSH_FP_DEFAULT); |
| printf("%u %s %s (%s)\n", sshkey_size(idlist->keys[i]), |
| fp == NULL ? "(null)" : fp, idlist->comments[i], |
| sshkey_type(idlist->keys[i])); |
| free(fp); |
| } else { |
| if ((r = sshkey_write(idlist->keys[i], stdout)) != 0) { |
| fprintf(stderr, "sshkey_write: %s\n", |
| ssh_err(r)); |
| continue; |
| } |
| fprintf(stdout, " %s", idlist->comments[i]); |
| left = sshkey_signatures_left(idlist->keys[i]); |
| if (left > 0) |
| fprintf(stdout, |
| " [signatures left %d]", left); |
| fprintf(stdout, "\n"); |
| } |
| } |
| ssh_free_identitylist(idlist); |
| return 0; |
| } |
| |
| static int |
| lock_agent(int agent_fd, int lock) |
| { |
| char prompt[100], *p1, *p2; |
| int r, 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; |
| } |
| freezero(p2, strlen(p2)); |
| } |
| if (passok) { |
| if ((r = ssh_lock_agent(agent_fd, lock, p1)) == 0) { |
| fprintf(stderr, "Agent %slocked.\n", lock ? "" : "un"); |
| ret = 0; |
| } else { |
| fprintf(stderr, "Failed to %slock agent: %s\n", |
| lock ? "" : "un", ssh_err(r)); |
| } |
| } |
| freezero(p1, strlen(p1)); |
| return (ret); |
| } |
| |
| static int |
| load_resident_keys(int agent_fd, const char *skprovider, int qflag, |
| struct dest_constraint **dest_constraints, size_t ndest_constraints) |
| { |
| struct sshsk_resident_key **srks; |
| size_t nsrks, i; |
| struct sshkey *key; |
| int r, ok = 0; |
| char *fp; |
| |
| pass = read_passphrase("Enter PIN for authenticator: ", RP_ALLOW_STDIN); |
| if ((r = sshsk_load_resident(skprovider, NULL, pass, 0, |
| &srks, &nsrks)) != 0) { |
| error_r(r, "Unable to load resident keys"); |
| return r; |
| } |
| for (i = 0; i < nsrks; i++) { |
| key = srks[i]->key; |
| if ((fp = sshkey_fingerprint(key, |
| fingerprint_hash, SSH_FP_DEFAULT)) == NULL) |
| fatal_f("sshkey_fingerprint failed"); |
| if ((r = ssh_add_identity_constrained(agent_fd, key, "", |
| lifetime, confirm, maxsign, skprovider, |
| dest_constraints, ndest_constraints)) != 0) { |
| error("Unable to add key %s %s", |
| sshkey_type(key), fp); |
| free(fp); |
| ok = r; |
| continue; |
| } |
| if (ok == 0) |
| ok = 1; |
| if (!qflag) { |
| fprintf(stderr, "Resident identity added: %s %s\n", |
| sshkey_type(key), fp); |
| 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"); |
| } |
| } |
| free(fp); |
| } |
| sshsk_free_resident_keys(srks, nsrks); |
| if (nsrks == 0) |
| return SSH_ERR_KEY_NOT_FOUND; |
| return ok == 1 ? 0 : ok; |
| } |
| |
| static int |
| do_file(int agent_fd, int deleting, int key_only, char *file, int qflag, |
| const char *skprovider, struct dest_constraint **dest_constraints, |
| size_t ndest_constraints) |
| { |
| if (deleting) { |
| if (delete_file(agent_fd, file, key_only, qflag) == -1) |
| return -1; |
| } else { |
| if (add_file(agent_fd, file, key_only, qflag, skprovider, |
| dest_constraints, ndest_constraints) == -1) |
| return -1; |
| } |
| return 0; |
| } |
| |
| /* Append string 's' to a NULL-terminated array of strings */ |
| static void |
| stringlist_append(char ***listp, const char *s) |
| { |
| size_t i = 0; |
| |
| if (*listp == NULL) |
| *listp = xcalloc(2, sizeof(**listp)); |
| else { |
| for (i = 0; (*listp)[i] != NULL; i++) |
| ; /* count */ |
| *listp = xrecallocarray(*listp, i + 1, i + 2, sizeof(**listp)); |
| } |
| (*listp)[i] = xstrdup(s); |
| } |
| |
| static void |
| parse_dest_constraint_hop(const char *s, struct dest_constraint_hop *dch, |
| char **hostkey_files) |
| { |
| char *user = NULL, *host, *os, *path; |
| size_t i; |
| struct hostkeys *hostkeys; |
| const struct hostkey_entry *hke; |
| int r, want_ca; |
| |
| memset(dch, '\0', sizeof(*dch)); |
| os = xstrdup(s); |
| if ((host = strchr(os, '@')) == NULL) |
| host = os; |
| else { |
| *host++ = '\0'; |
| user = os; |
| } |
| cleanhostname(host); |
| /* Trivial case: username@ (all hosts) */ |
| if (*host == '\0') { |
| if (user == NULL) { |
| fatal("Invalid key destination constraint \"%s\": " |
| "does not specify user or host", s); |
| } |
| dch->user = xstrdup(user); |
| /* other fields left blank */ |
| free(os); |
| return; |
| } |
| if (hostkey_files == NULL) |
| fatal_f("no hostkey files"); |
| /* Otherwise we need to look up the keys for this hostname */ |
| hostkeys = init_hostkeys(); |
| for (i = 0; hostkey_files[i]; i++) { |
| path = tilde_expand_filename(hostkey_files[i], getuid()); |
| debug2_f("looking up host keys for \"%s\" in %s", host, path); |
| load_hostkeys(hostkeys, host, path, 0); |
| free(path); |
| } |
| dch->user = user == NULL ? NULL : xstrdup(user); |
| dch->hostname = xstrdup(host); |
| for (i = 0; i < hostkeys->num_entries; i++) { |
| hke = hostkeys->entries + i; |
| want_ca = hke->marker == MRK_CA; |
| if (hke->marker != MRK_NONE && !want_ca) |
| continue; |
| debug3_f("%s%s%s: adding %s %skey from %s:%lu as key %u", |
| user == NULL ? "": user, user == NULL ? "" : "@", |
| host, sshkey_type(hke->key), want_ca ? "CA " : "", |
| hke->file, hke->line, dch->nkeys); |
| dch->keys = xrecallocarray(dch->keys, dch->nkeys, |
| dch->nkeys + 1, sizeof(*dch->keys)); |
| dch->key_is_ca = xrecallocarray(dch->key_is_ca, dch->nkeys, |
| dch->nkeys + 1, sizeof(*dch->key_is_ca)); |
| if ((r = sshkey_from_private(hke->key, |
| &(dch->keys[dch->nkeys]))) != 0) |
| fatal_fr(r, "sshkey_from_private"); |
| dch->key_is_ca[dch->nkeys] = want_ca; |
| dch->nkeys++; |
| } |
| if (dch->nkeys == 0) |
| fatal("No host keys found for destination \"%s\"", host); |
| free_hostkeys(hostkeys); |
| free(os); |
| return; |
| } |
| |
| static void |
| parse_dest_constraint(const char *s, struct dest_constraint ***dcp, |
| size_t *ndcp, char **hostkey_files) |
| { |
| struct dest_constraint *dc; |
| char *os, *cp; |
| |
| dc = xcalloc(1, sizeof(*dc)); |
| os = xstrdup(s); |
| if ((cp = strchr(os, '>')) == NULL) { |
| /* initial hop; no 'from' hop specified */ |
| parse_dest_constraint_hop(os, &dc->to, hostkey_files); |
| } else { |
| /* two hops specified */ |
| *(cp++) = '\0'; |
| parse_dest_constraint_hop(os, &dc->from, hostkey_files); |
| parse_dest_constraint_hop(cp, &dc->to, hostkey_files); |
| if (dc->from.user != NULL) { |
| fatal("Invalid key constraint %s: cannot specify " |
| "user on 'from' host", os); |
| } |
| } |
| /* XXX eliminate or error on duplicates */ |
| debug2_f("constraint %zu: %s%s%s (%u keys) > %s%s%s (%u keys)", *ndcp, |
| dc->from.user ? dc->from.user : "", dc->from.user ? "@" : "", |
| dc->from.hostname ? dc->from.hostname : "(ORIGIN)", dc->from.nkeys, |
| dc->to.user ? dc->to.user : "", dc->to.user ? "@" : "", |
| dc->to.hostname ? dc->to.hostname : "(ANY)", dc->to.nkeys); |
| *dcp = xrecallocarray(*dcp, *ndcp, *ndcp + 1, sizeof(**dcp)); |
| (*dcp)[(*ndcp)++] = dc; |
| free(os); |
| } |
| |
| |
| static void |
| usage(void) |
| { |
| fprintf(stderr, |
| "usage: ssh-add [-cDdKkLlqvXx] [-E fingerprint_hash] [-H hostkey_file]\n" |
| " [-h destination_constraint] [-S provider] [-t life]\n" |
| #ifdef WITH_XMSS |
| " [-M maxsign] [-m minleft]\n" |
| #endif |
| " [file ...]\n" |
| " ssh-add -s pkcs11\n" |
| " ssh-add -e pkcs11\n" |
| " ssh-add -T pubkey ...\n" |
| ); |
| } |
| |
| int |
| main(int argc, char **argv) |
| { |
| extern char *optarg; |
| extern int optind; |
| int agent_fd; |
| char *pkcs11provider = NULL, *skprovider = NULL; |
| char **dest_constraint_strings = NULL, **hostkey_files = NULL; |
| int r, i, ch, deleting = 0, ret = 0, key_only = 0, do_download = 0; |
| int xflag = 0, lflag = 0, Dflag = 0, qflag = 0, Tflag = 0; |
| SyslogFacility log_facility = SYSLOG_FACILITY_AUTH; |
| LogLevel log_level = SYSLOG_LEVEL_INFO; |
| struct dest_constraint **dest_constraints = NULL; |
| size_t ndest_constraints = 0; |
| |
| /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
| sanitise_stdfd(); |
| |
| __progname = ssh_get_progname(argv[0]); |
| seed_rng(); |
| |
| log_init(__progname, log_level, log_facility, 1); |
| |
| setvbuf(stdout, NULL, _IOLBF, 0); |
| |
| /* First, get a connection to the authentication agent. */ |
| switch (r = ssh_get_authentication_socket(&agent_fd)) { |
| case 0: |
| break; |
| case SSH_ERR_AGENT_NOT_PRESENT: |
| fprintf(stderr, "Could not open a connection to your " |
| "authentication agent.\n"); |
| exit(2); |
| default: |
| fprintf(stderr, "Error connecting to agent: %s\n", ssh_err(r)); |
| exit(2); |
| } |
| |
| skprovider = getenv("SSH_SK_PROVIDER"); |
| |
| while ((ch = getopt(argc, argv, "vkKlLcdDTxXE:e:h:H:M:m:qs:S:t:")) != -1) { |
| switch (ch) { |
| case 'v': |
| if (log_level == SYSLOG_LEVEL_INFO) |
| log_level = SYSLOG_LEVEL_DEBUG1; |
| else if (log_level < SYSLOG_LEVEL_DEBUG3) |
| log_level++; |
| break; |
| case 'E': |
| fingerprint_hash = ssh_digest_alg_by_name(optarg); |
| if (fingerprint_hash == -1) |
| fatal("Invalid hash algorithm \"%s\"", optarg); |
| break; |
| case 'H': |
| stringlist_append(&hostkey_files, optarg); |
| break; |
| case 'h': |
| stringlist_append(&dest_constraint_strings, optarg); |
| break; |
| case 'k': |
| key_only = 1; |
| break; |
| case 'K': |
| do_download = 1; |
| break; |
| case 'l': |
| case 'L': |
| if (lflag != 0) |
| fatal("-%c flag already specified", lflag); |
| lflag = ch; |
| break; |
| case 'x': |
| case 'X': |
| if (xflag != 0) |
| fatal("-%c flag already specified", xflag); |
| xflag = ch; |
| break; |
| case 'c': |
| confirm = 1; |
| break; |
| case 'm': |
| minleft = (int)strtonum(optarg, 1, UINT_MAX, NULL); |
| if (minleft == 0) { |
| usage(); |
| ret = 1; |
| goto done; |
| } |
| break; |
| case 'M': |
| maxsign = (int)strtonum(optarg, 1, UINT_MAX, NULL); |
| if (maxsign == 0) { |
| usage(); |
| ret = 1; |
| goto done; |
| } |
| break; |
| case 'd': |
| deleting = 1; |
| break; |
| case 'D': |
| Dflag = 1; |
| break; |
| case 's': |
| pkcs11provider = optarg; |
| break; |
| case 'S': |
| skprovider = optarg; |
| break; |
| case 'e': |
| deleting = 1; |
| pkcs11provider = optarg; |
| break; |
| case 't': |
| if ((lifetime = convtime(optarg)) == -1 || |
| lifetime < 0 || (u_long)lifetime > UINT32_MAX) { |
| fprintf(stderr, "Invalid lifetime\n"); |
| ret = 1; |
| goto done; |
| } |
| break; |
| case 'q': |
| qflag = 1; |
| break; |
| case 'T': |
| Tflag = 1; |
| break; |
| default: |
| usage(); |
| ret = 1; |
| goto done; |
| } |
| } |
| log_init(__progname, log_level, log_facility, 1); |
| |
| if ((xflag != 0) + (lflag != 0) + (Dflag != 0) > 1) |
| fatal("Invalid combination of actions"); |
| else if (xflag) { |
| if (lock_agent(agent_fd, xflag == 'x' ? 1 : 0) == -1) |
| ret = 1; |
| goto done; |
| } else if (lflag) { |
| if (list_identities(agent_fd, lflag == 'l' ? 1 : 0) == -1) |
| ret = 1; |
| goto done; |
| } else if (Dflag) { |
| if (delete_all(agent_fd, qflag) == -1) |
| ret = 1; |
| goto done; |
| } |
| |
| #ifdef ENABLE_SK_INTERNAL |
| if (skprovider == NULL) |
| skprovider = "internal"; |
| #endif |
| |
| if (hostkey_files == NULL) { |
| /* use defaults from readconf.c */ |
| stringlist_append(&hostkey_files, _PATH_SSH_USER_HOSTFILE); |
| stringlist_append(&hostkey_files, _PATH_SSH_USER_HOSTFILE2); |
| stringlist_append(&hostkey_files, _PATH_SSH_SYSTEM_HOSTFILE); |
| stringlist_append(&hostkey_files, _PATH_SSH_SYSTEM_HOSTFILE2); |
| } |
| if (dest_constraint_strings != NULL) { |
| for (i = 0; dest_constraint_strings[i] != NULL; i++) { |
| parse_dest_constraint(dest_constraint_strings[i], |
| &dest_constraints, &ndest_constraints, hostkey_files); |
| } |
| } |
| |
| argc -= optind; |
| argv += optind; |
| if (Tflag) { |
| if (argc <= 0) |
| fatal("no keys to test"); |
| for (r = i = 0; i < argc; i++) |
| r |= test_key(agent_fd, argv[i]); |
| ret = r == 0 ? 0 : 1; |
| goto done; |
| } |
| if (pkcs11provider != NULL) { |
| if (update_card(agent_fd, !deleting, pkcs11provider, |
| qflag, dest_constraints, ndest_constraints) == -1) |
| ret = 1; |
| goto done; |
| } |
| if (do_download) { |
| if (skprovider == NULL) |
| fatal("Cannot download keys without provider"); |
| if (load_resident_keys(agent_fd, skprovider, qflag, |
| dest_constraints, ndest_constraints) != 0) |
| ret = 1; |
| goto done; |
| } |
| if (argc == 0) { |
| char buf[PATH_MAX]; |
| 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) == -1) |
| continue; |
| if (do_file(agent_fd, deleting, key_only, buf, |
| qflag, skprovider, |
| dest_constraints, ndest_constraints) == -1) |
| ret = 1; |
| else |
| count++; |
| } |
| if (count == 0) |
| ret = 1; |
| } else { |
| for (i = 0; i < argc; i++) { |
| if (do_file(agent_fd, deleting, key_only, |
| argv[i], qflag, skprovider, |
| dest_constraints, ndest_constraints) == -1) |
| ret = 1; |
| } |
| } |
| done: |
| clear_pass(); |
| ssh_close_authentication_socket(agent_fd); |
| return ret; |
| } |