522 lines
13 KiB
C
522 lines
13 KiB
C
/* $OpenBSD: ssh-add.c,v 1.105 2012/12/05 15:42:52 markus Exp $ */
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/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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* All rights reserved
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* Adds an identity to the authentication server, or removes an identity.
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*
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* As far as I am concerned, the code I have written for this software
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* can be used freely for any purpose. Any derived versions of this
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* software must be clearly marked as such, and if the derived work is
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* incompatible with the protocol description in the RFC file, it must be
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* called by a name other than "ssh" or "Secure Shell".
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*
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* SSH2 implementation,
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* Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "includes.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/param.h>
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#include <openssl/evp.h>
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#include "openbsd-compat/openssl-compat.h"
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#include <fcntl.h>
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#include <pwd.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "xmalloc.h"
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#include "ssh.h"
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#include "rsa.h"
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#include "log.h"
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#include "key.h"
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#include "buffer.h"
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#include "authfd.h"
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#include "authfile.h"
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#include "pathnames.h"
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#include "misc.h"
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/* argv0 */
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extern char *__progname;
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/* Default files to add */
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static char *default_files[] = {
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_PATH_SSH_CLIENT_ID_RSA,
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_PATH_SSH_CLIENT_ID_DSA,
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#ifdef OPENSSL_HAS_ECC
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_PATH_SSH_CLIENT_ID_ECDSA,
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#endif
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_PATH_SSH_CLIENT_IDENTITY,
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NULL
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};
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/* Default lifetime (0 == forever) */
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static int lifetime = 0;
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/* User has to confirm key use */
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static int confirm = 0;
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/* we keep a cache of one passphrases */
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static char *pass = NULL;
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static void
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clear_pass(void)
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{
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if (pass) {
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memset(pass, 0, strlen(pass));
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xfree(pass);
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pass = NULL;
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}
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}
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static int
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delete_file(AuthenticationConnection *ac, const char *filename, int key_only)
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{
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Key *public = NULL, *cert = NULL;
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char *certpath = NULL, *comment = NULL;
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int ret = -1;
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public = key_load_public(filename, &comment);
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if (public == NULL) {
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printf("Bad key file %s\n", filename);
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return -1;
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}
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if (ssh_remove_identity(ac, public)) {
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fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment);
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ret = 0;
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} else
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fprintf(stderr, "Could not remove identity: %s\n", filename);
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if (key_only)
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goto out;
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/* Now try to delete the corresponding certificate too */
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free(comment);
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comment = NULL;
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xasprintf(&certpath, "%s-cert.pub", filename);
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if ((cert = key_load_public(certpath, &comment)) == NULL)
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goto out;
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if (!key_equal_public(cert, public))
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fatal("Certificate %s does not match private key %s",
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certpath, filename);
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if (ssh_remove_identity(ac, cert)) {
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fprintf(stderr, "Identity removed: %s (%s)\n", certpath,
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comment);
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ret = 0;
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} else
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fprintf(stderr, "Could not remove identity: %s\n", certpath);
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out:
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if (cert != NULL)
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key_free(cert);
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if (public != NULL)
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key_free(public);
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free(certpath);
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free(comment);
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return ret;
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}
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/* Send a request to remove all identities. */
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static int
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delete_all(AuthenticationConnection *ac)
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{
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int ret = -1;
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if (ssh_remove_all_identities(ac, 1))
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ret = 0;
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/* ignore error-code for ssh2 */
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ssh_remove_all_identities(ac, 2);
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if (ret == 0)
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fprintf(stderr, "All identities removed.\n");
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else
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fprintf(stderr, "Failed to remove all identities.\n");
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return ret;
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}
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static int
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add_file(AuthenticationConnection *ac, const char *filename, int key_only)
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{
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Key *private, *cert;
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char *comment = NULL;
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char msg[1024], *certpath = NULL;
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int fd, perms_ok, ret = -1;
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Buffer keyblob;
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if (strcmp(filename, "-") == 0) {
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fd = STDIN_FILENO;
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filename = "(stdin)";
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} else if ((fd = open(filename, O_RDONLY)) < 0) {
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perror(filename);
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return -1;
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}
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/*
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* Since we'll try to load a keyfile multiple times, permission errors
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* will occur multiple times, so check perms first and bail if wrong.
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*/
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if (fd != STDIN_FILENO) {
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perms_ok = key_perm_ok(fd, filename);
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if (!perms_ok) {
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close(fd);
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return -1;
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}
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}
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buffer_init(&keyblob);
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if (!key_load_file(fd, filename, &keyblob)) {
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buffer_free(&keyblob);
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close(fd);
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return -1;
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}
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close(fd);
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/* At first, try empty passphrase */
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private = key_parse_private(&keyblob, filename, "", &comment);
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if (comment == NULL)
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comment = xstrdup(filename);
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/* try last */
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if (private == NULL && pass != NULL)
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private = key_parse_private(&keyblob, filename, pass, NULL);
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if (private == NULL) {
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/* clear passphrase since it did not work */
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clear_pass();
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snprintf(msg, sizeof msg, "Enter passphrase for %.200s: ",
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comment);
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for (;;) {
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pass = read_passphrase(msg, RP_ALLOW_STDIN);
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if (strcmp(pass, "") == 0) {
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clear_pass();
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xfree(comment);
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buffer_free(&keyblob);
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return -1;
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}
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private = key_parse_private(&keyblob, filename, pass,
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&comment);
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if (private != NULL)
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break;
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clear_pass();
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snprintf(msg, sizeof msg,
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"Bad passphrase, try again for %.200s: ", comment);
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}
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}
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buffer_free(&keyblob);
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if (ssh_add_identity_constrained(ac, private, comment, lifetime,
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confirm)) {
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fprintf(stderr, "Identity added: %s (%s)\n", filename, comment);
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ret = 0;
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if (lifetime != 0)
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fprintf(stderr,
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"Lifetime set to %d seconds\n", lifetime);
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if (confirm != 0)
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fprintf(stderr,
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"The user must confirm each use of the key\n");
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} else {
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fprintf(stderr, "Could not add identity: %s\n", filename);
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}
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/* Skip trying to load the cert if requested */
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if (key_only)
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goto out;
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/* Now try to add the certificate flavour too */
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xasprintf(&certpath, "%s-cert.pub", filename);
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if ((cert = key_load_public(certpath, NULL)) == NULL)
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goto out;
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if (!key_equal_public(cert, private)) {
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error("Certificate %s does not match private key %s",
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certpath, filename);
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key_free(cert);
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goto out;
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}
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/* Graft with private bits */
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if (key_to_certified(private, key_cert_is_legacy(cert)) != 0) {
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error("%s: key_to_certified failed", __func__);
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key_free(cert);
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goto out;
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}
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key_cert_copy(cert, private);
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key_free(cert);
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if (!ssh_add_identity_constrained(ac, private, comment,
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lifetime, confirm)) {
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error("Certificate %s (%s) add failed", certpath,
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private->cert->key_id);
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}
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fprintf(stderr, "Certificate added: %s (%s)\n", certpath,
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private->cert->key_id);
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if (lifetime != 0)
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fprintf(stderr, "Lifetime set to %d seconds\n", lifetime);
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if (confirm != 0)
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fprintf(stderr, "The user must confirm each use of the key\n");
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out:
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if (certpath != NULL)
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xfree(certpath);
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xfree(comment);
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key_free(private);
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return ret;
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}
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static int
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update_card(AuthenticationConnection *ac, int add, const char *id)
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{
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char *pin;
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int ret = -1;
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pin = read_passphrase("Enter passphrase for PKCS#11: ", RP_ALLOW_STDIN);
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if (pin == NULL)
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return -1;
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if (ssh_update_card(ac, add, id, pin, lifetime, confirm)) {
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fprintf(stderr, "Card %s: %s\n",
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add ? "added" : "removed", id);
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ret = 0;
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} else {
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fprintf(stderr, "Could not %s card: %s\n",
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add ? "add" : "remove", id);
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ret = -1;
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}
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xfree(pin);
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return ret;
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}
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static int
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list_identities(AuthenticationConnection *ac, int do_fp)
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{
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Key *key;
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char *comment, *fp;
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int had_identities = 0;
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int version;
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for (version = 1; version <= 2; version++) {
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for (key = ssh_get_first_identity(ac, &comment, version);
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key != NULL;
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key = ssh_get_next_identity(ac, &comment, version)) {
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had_identities = 1;
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if (do_fp) {
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fp = key_fingerprint(key, SSH_FP_MD5,
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SSH_FP_HEX);
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printf("%d %s %s (%s)\n",
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key_size(key), fp, comment, key_type(key));
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xfree(fp);
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} else {
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if (!key_write(key, stdout))
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fprintf(stderr, "key_write failed");
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fprintf(stdout, " %s\n", comment);
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}
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key_free(key);
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xfree(comment);
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}
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}
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if (!had_identities) {
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printf("The agent has no identities.\n");
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return -1;
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}
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return 0;
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}
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static int
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lock_agent(AuthenticationConnection *ac, int lock)
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{
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char prompt[100], *p1, *p2;
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int passok = 1, ret = -1;
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strlcpy(prompt, "Enter lock password: ", sizeof(prompt));
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p1 = read_passphrase(prompt, RP_ALLOW_STDIN);
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if (lock) {
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strlcpy(prompt, "Again: ", sizeof prompt);
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p2 = read_passphrase(prompt, RP_ALLOW_STDIN);
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if (strcmp(p1, p2) != 0) {
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fprintf(stderr, "Passwords do not match.\n");
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passok = 0;
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}
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memset(p2, 0, strlen(p2));
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xfree(p2);
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}
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if (passok && ssh_lock_agent(ac, lock, p1)) {
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fprintf(stderr, "Agent %slocked.\n", lock ? "" : "un");
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ret = 0;
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} else
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fprintf(stderr, "Failed to %slock agent.\n", lock ? "" : "un");
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memset(p1, 0, strlen(p1));
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xfree(p1);
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return (ret);
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}
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static int
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do_file(AuthenticationConnection *ac, int deleting, int key_only, char *file)
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{
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if (deleting) {
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if (delete_file(ac, file, key_only) == -1)
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return -1;
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} else {
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if (add_file(ac, file, key_only) == -1)
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return -1;
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}
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return 0;
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}
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static void
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usage(void)
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{
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fprintf(stderr, "usage: %s [options] [file ...]\n", __progname);
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fprintf(stderr, "Options:\n");
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fprintf(stderr, " -l List fingerprints of all identities.\n");
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fprintf(stderr, " -L List public key parameters of all identities.\n");
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fprintf(stderr, " -k Load only keys and not certificates.\n");
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fprintf(stderr, " -c Require confirmation to sign using identities\n");
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fprintf(stderr, " -t life Set lifetime (in seconds) when adding identities.\n");
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fprintf(stderr, " -d Delete identity.\n");
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fprintf(stderr, " -D Delete all identities.\n");
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fprintf(stderr, " -x Lock agent.\n");
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fprintf(stderr, " -X Unlock agent.\n");
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fprintf(stderr, " -s pkcs11 Add keys from PKCS#11 provider.\n");
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fprintf(stderr, " -e pkcs11 Remove keys provided by PKCS#11 provider.\n");
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}
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int
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main(int argc, char **argv)
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{
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extern char *optarg;
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extern int optind;
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AuthenticationConnection *ac = NULL;
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char *pkcs11provider = NULL;
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int i, ch, deleting = 0, ret = 0, key_only = 0;
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/* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
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sanitise_stdfd();
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__progname = ssh_get_progname(argv[0]);
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seed_rng();
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OpenSSL_add_all_algorithms();
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/* At first, get a connection to the authentication agent. */
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ac = ssh_get_authentication_connection();
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if (ac == NULL) {
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fprintf(stderr,
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"Could not open a connection to your authentication agent.\n");
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exit(2);
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}
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while ((ch = getopt(argc, argv, "klLcdDxXe:s:t:")) != -1) {
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switch (ch) {
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case 'k':
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key_only = 1;
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break;
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case 'l':
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case 'L':
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if (list_identities(ac, ch == 'l' ? 1 : 0) == -1)
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ret = 1;
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goto done;
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case 'x':
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case 'X':
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if (lock_agent(ac, ch == 'x' ? 1 : 0) == -1)
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ret = 1;
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goto done;
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case 'c':
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confirm = 1;
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break;
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case 'd':
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deleting = 1;
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break;
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case 'D':
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if (delete_all(ac) == -1)
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ret = 1;
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goto done;
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case 's':
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pkcs11provider = optarg;
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break;
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case 'e':
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deleting = 1;
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pkcs11provider = optarg;
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break;
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case 't':
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if ((lifetime = convtime(optarg)) == -1) {
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fprintf(stderr, "Invalid lifetime\n");
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ret = 1;
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goto done;
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}
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break;
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default:
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usage();
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ret = 1;
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goto done;
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}
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}
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argc -= optind;
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argv += optind;
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if (pkcs11provider != NULL) {
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if (update_card(ac, !deleting, pkcs11provider) == -1)
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ret = 1;
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goto done;
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}
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if (argc == 0) {
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char buf[MAXPATHLEN];
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struct passwd *pw;
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struct stat st;
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int count = 0;
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if ((pw = getpwuid(getuid())) == NULL) {
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fprintf(stderr, "No user found with uid %u\n",
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(u_int)getuid());
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ret = 1;
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goto done;
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}
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for (i = 0; default_files[i]; i++) {
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snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir,
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default_files[i]);
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if (stat(buf, &st) < 0)
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continue;
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if (do_file(ac, deleting, key_only, buf) == -1)
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ret = 1;
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else
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count++;
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}
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if (count == 0)
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ret = 1;
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} else {
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for (i = 0; i < argc; i++) {
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if (do_file(ac, deleting, key_only, argv[i]) == -1)
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ret = 1;
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}
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}
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clear_pass();
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done:
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ssh_close_authentication_connection(ac);
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return ret;
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}
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