mirror of git://anongit.mindrot.org/openssh.git
322 lines
7.1 KiB
C
322 lines
7.1 KiB
C
/*
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ssh-add.c
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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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Created: Thu Apr 6 00:52:24 1995 ylo
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Adds an identity to the authentication server, or removes an identity.
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*/
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#include "includes.h"
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RCSID("$Id: ssh-add.c,v 1.9 1999/11/16 02:37:16 damien Exp $");
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#include "rsa.h"
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#include "ssh.h"
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#include "xmalloc.h"
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#include "authfd.h"
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#ifdef USE_EXTERNAL_ASKPASS
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int askpass(const char *filename, RSA *key, const char *saved_comment, char **comment);
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#endif /* USE_EXTERNAL_ASKPASS */
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#ifdef HAVE___PROGNAME
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extern char *__progname;
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#else /* HAVE___PROGNAME */
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const char *__progname = "ssh-add";
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#endif /* HAVE___PROGNAME */
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void
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delete_file(AuthenticationConnection *ac, const char *filename)
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{
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RSA *key;
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char *comment;
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key = RSA_new();
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if (!load_public_key(filename, key, &comment))
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{
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printf("Bad key file %s: %s\n", filename, strerror(errno));
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return;
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}
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if (ssh_remove_identity(ac, key))
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fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment);
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else
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fprintf(stderr, "Could not remove identity: %s\n", filename);
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RSA_free(key);
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xfree(comment);
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}
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void
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delete_all(AuthenticationConnection *ac)
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{
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/* Send a request to remove all identities. */
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if (ssh_remove_all_identities(ac))
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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 identitities.\n");
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}
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void
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add_file(AuthenticationConnection *ac, const char *filename)
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{
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RSA *key;
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RSA *public_key;
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char *saved_comment, *comment;
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int success;
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key = RSA_new();
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public_key = RSA_new();
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if (!load_public_key(filename, public_key, &saved_comment))
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{
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printf("Bad key file %s: %s\n", filename, strerror(errno));
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return;
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}
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RSA_free(public_key);
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/* At first, try empty passphrase */
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success = load_private_key(filename, "", key, &comment);
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if (!success) {
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printf("Need passphrase for %s (%s).\n", filename, saved_comment);
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if (!isatty(STDIN_FILENO)) {
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#ifdef USE_EXTERNAL_ASKPASS
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int prompts = 3;
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while (prompts && !success)
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{
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success = askpass(filename, key, saved_comment, &comment);
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prompts--;
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}
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if (!success)
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{
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xfree(saved_comment);
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return;
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}
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#else /* !USE_EXTERNAL_ASKPASS */
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xfree(saved_comment);
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return;
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#endif /* USE_EXTERNAL_ASKPASS */
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}
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while (!success) {
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char *pass = read_passphrase("Enter passphrase: ", 1);
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if (strcmp(pass, "") == 0){
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xfree(pass);
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xfree(saved_comment);
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return;
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}
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success = load_private_key(filename, pass, key, &comment);
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memset(pass, 0, strlen(pass));
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xfree(pass);
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if (success)
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break;
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printf("Bad passphrase.\n");
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}
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}
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xfree(saved_comment);
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if (ssh_add_identity(ac, key, comment))
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fprintf(stderr, "Identity added: %s (%s)\n", filename, comment);
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else
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fprintf(stderr, "Could not add identity: %s\n", filename);
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RSA_free(key);
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xfree(comment);
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}
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void
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list_identities(AuthenticationConnection *ac)
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{
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BIGNUM *e, *n;
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int status;
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char *comment;
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int had_identities;
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e = BN_new();
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n = BN_new();
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had_identities = 0;
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for (status = ssh_get_first_identity(ac, e, n, &comment);
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status;
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status = ssh_get_next_identity(ac, e, n, &comment))
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{
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char *ebuf, *nbuf;
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had_identities = 1;
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ebuf = BN_bn2dec(e);
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if (ebuf == NULL) {
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error("list_identities: BN_bn2dec(e) failed.");
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}else{
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nbuf = BN_bn2dec(n);
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if (nbuf == NULL) {
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error("list_identities: BN_bn2dec(n) failed.");
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}else{
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unsigned int bits = BN_num_bits(n);
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printf("%d %s %s %s\n", bits, ebuf, nbuf, comment);
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free(nbuf);
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}
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free(ebuf);
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}
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xfree(comment);
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}
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BN_clear_free(e);
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BN_clear_free(n);
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if (!had_identities)
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printf("The agent has no identities.\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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AuthenticationConnection *ac = NULL;
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struct passwd *pw;
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char buf[1024];
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int no_files = 1;
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int i;
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int deleting = 0;
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/* check if RSA support exists */
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if (rsa_alive() == 0) {
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fprintf(stderr,
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"%s: no RSA support in libssl and libcrypto. See ssl(8).\n",
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__progname);
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exit(1);
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}
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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, "Could not open a connection to your authentication agent.\n");
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exit(1);
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}
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for (i = 1; i < argc; i++)
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{
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if (strcmp(argv[i], "-l") == 0)
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{
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list_identities(ac);
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no_files = 0; /* Don't default-add/delete if -l. */
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continue;
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}
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if (strcmp(argv[i], "-d") == 0)
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{
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deleting = 1;
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continue;
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}
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if (strcmp(argv[i], "-D") == 0)
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{
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delete_all(ac);
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no_files = 0;
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continue;
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}
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no_files = 0;
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if (deleting)
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delete_file(ac, argv[i]);
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else
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add_file(ac, argv[i]);
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}
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if (no_files)
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{
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pw = getpwuid(getuid());
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if (!pw)
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{
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fprintf(stderr, "No user found with uid %d\n", (int)getuid());
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ssh_close_authentication_connection(ac);
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exit(1);
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}
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snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir, SSH_CLIENT_IDENTITY);
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if (deleting)
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delete_file(ac, buf);
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else
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add_file(ac, buf);
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}
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ssh_close_authentication_connection(ac);
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exit(0);
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}
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#ifdef USE_EXTERNAL_ASKPASS
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int askpass(const char *filename, RSA *key, const char *saved_comment, char **comment)
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{
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int pipes[2];
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char buf[1024];
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int tmp;
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pid_t child;
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FILE *pipef;
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/* Check that we are X11-capable */
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if (getenv("DISPLAY") == NULL)
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exit(1);
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if (pipe(pipes) == -1) {
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fprintf(stderr, "Creating pipes failed: %s\n", strerror(errno));
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exit(1);
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}
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if (fflush(NULL) == EOF) {
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fprintf(stderr, "Cannot flush buffers: %s\n", strerror(errno));
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exit(1);
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}
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child = fork();
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if (child == -1) {
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fprintf(stderr, "Cannot fork: %s\n", strerror(errno));
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exit(1);
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}
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if (child == 0) {
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/* In child */
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close(pipes[0]);
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if (dup2(pipes[1], 1) ==-1) {
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fprintf(stderr, "dup2 failed: %s\n", strerror(errno));
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exit(1);
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}
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tmp = snprintf(buf, sizeof(buf), "Need passphrase for %s (%s)", filename, saved_comment);
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/* skip the prompt if it won't fit */
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if ((tmp < 0) || (tmp >= sizeof(buf)))
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tmp = execlp(ASKPASS_PROGRAM, "ssh-askpass", 0);
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else
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tmp = execlp(ASKPASS_PROGRAM, "ssh-askpass", buf, 0);
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/* Shouldn't get this far */
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fprintf(stderr, "Executing ssh-askpass failed: %s\n", strerror(errno));
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exit(1);
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}
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/* In parent */
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close(pipes[1]);
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if ((pipef = fdopen(pipes[0], "r")) == NULL) {
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fprintf(stderr, "fdopen failed: %s\n", strerror(errno));
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exit(1);
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}
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/* Read passphrase back from child, abort if none presented */
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if(fgets(buf, sizeof(buf), pipef) == NULL)
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exit(1);
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fclose(pipef);
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if (strchr(buf, '\n'))
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*strchr(buf, '\n') = 0;
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if (waitpid(child, NULL, 0) == -1) {
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fprintf(stderr, "Waiting for child failed: %s\n",
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strerror(errno));
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exit(1);
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}
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/* Try password as it was presented */
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tmp = load_private_key(filename, buf, key, comment);
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memset(buf, 0, sizeof(buf));
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return(tmp);
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}
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#endif /* USE_EXTERNAL_ASKPASS */
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