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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 14:40:04 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 14:40:04 +0000
commit25505898530a333011f4fd5cbc841ad6b26c089c (patch)
tree333a33fdd60930bcccc3f177ed9467d535e9bac6 /ssh-add.c
parentInitial commit. (diff)
downloadopenssh-25505898530a333011f4fd5cbc841ad6b26c089c.tar.xz
openssh-25505898530a333011f4fd5cbc841ad6b26c089c.zip
Adding upstream version 1:9.2p1.upstream/1%9.2p1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'ssh-add.c')
-rw-r--r--ssh-add.c1014
1 files changed, 1014 insertions, 0 deletions
diff --git a/ssh-add.c b/ssh-add.c
new file mode 100644
index 0000000..777f21e
--- /dev/null
+++ b/ssh-add.c
@@ -0,0 +1,1014 @@
+/* $OpenBSD: ssh-add.c,v 1.166 2022/06/18 02:17:16 dtucker 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;
+ 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;
+ }
+ arc4random_buf(data, sizeof(data));
+ if ((r = ssh_agent_sign(agent_fd, key, &sig, &slen, data, sizeof(data),
+ NULL, 0)) != 0) {
+ error_r(r, "Agent signature failed for %s", filename);
+ goto done;
+ }
+ if ((r = sshkey_verify(key, sig, slen, data, sizeof(data),
+ NULL, 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;
+}