|
- /* $OpenBSD: ssh-add.c,v 1.172 2024/01/11 01:45:36 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,
- #ifdef WITH_DSA
- _PATH_SSH_CLIENT_ID_DSA,
- #endif
- 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, int key_only, int cert_only)
- {
- 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 ((!key_only && !cert_only) ||
- (key_only && !sshkey_is_cert(key)) ||
- (cert_only && sshkey_is_cert(key))) {
- 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 cert_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, key_only, cert_only);
-
- if ((r = sshkey_load_public(filename, &public, &comment)) != 0) {
- printf("Bad key file %s: %s\n", filename, ssh_err(r));
- return -1;
- }
- if ((!key_only && !cert_only) ||
- (key_only && !sshkey_is_cert(public)) ||
- (cert_only && sshkey_is_cert(public))) {
- 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 cert_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 (!cert_only &&
- (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,
- int key_only, int cert_only,
- struct dest_constraint **dest_constraints, size_t ndest_constraints,
- struct sshkey **certs, size_t ncerts)
- {
- char *pin = NULL;
- int r, ret = -1;
-
- if (key_only)
- ncerts = 0;
-
- 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,
- cert_only, certs, ncerts)) == 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, int cert_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,
- cert_only, qflag) == -1)
- return -1;
- } else {
- if (add_file(agent_fd, file, key_only, cert_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 [-CcDdKkLlqvXx] [-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 [-Cv] [certificate ...]\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, cert_only = 0;
- int do_download = 0, xflag = 0, lflag = 0, Dflag = 0;
- int qflag = 0, Tflag = 0;
- SyslogFacility log_facility = SYSLOG_FACILITY_AUTH;
- LogLevel log_level = SYSLOG_LEVEL_INFO;
- struct sshkey *k, **certs = NULL;
- struct dest_constraint **dest_constraints = NULL;
- size_t ndest_constraints = 0, ncerts = 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, "vkKlLCcdDTxXE: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 'C':
- cert_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 = (u_int)strtonum(optarg, 1, UINT_MAX, NULL);
- if (minleft == 0) {
- usage();
- ret = 1;
- goto done;
- }
- break;
- case 'M':
- maxsign = (u_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) {
- for (i = 0; i < argc; i++) {
- if ((r = sshkey_load_public(argv[i], &k, NULL)) != 0)
- fatal_fr(r, "load certificate %s", argv[i]);
- certs = xrecallocarray(certs, ncerts, ncerts + 1,
- sizeof(*certs));
- debug2("%s: %s", argv[i], sshkey_ssh_name(k));
- certs[ncerts++] = k;
- }
- debug2_f("loaded %zu certificates", ncerts);
- if (update_card(agent_fd, !deleting, pkcs11provider,
- qflag, key_only, cert_only,
- dest_constraints, ndest_constraints,
- certs, ncerts) == -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, cert_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, cert_only,
- argv[i], qflag, skprovider,
- dest_constraints, ndest_constraints) == -1)
- ret = 1;
- }
- }
- done:
- clear_pass();
- ssh_close_authentication_socket(agent_fd);
- return ret;
- }
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