mirror of
git://anongit.mindrot.org/openssh.git
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5428f646ad
- Merged OpenBSD CVS changes: - [channels.c] report from mrwizard@psu.edu via djm@ibs.com.au - [channels.c] set SO_REUSEADDR and SO_LINGER for forwarded ports. chip@valinux.com via damien@ibs.com.au - [nchan.c] it's not an error() if shutdown_write failes in nchan. - [readconf.c] remove dead #ifdef-0-code - [readconf.c servconf.c] strcasecmp instead of tolower - [scp.c] progress meter overflow fix from damien@ibs.com.au - [ssh-add.1 ssh-add.c] SSH_ASKPASS support - [ssh.1 ssh.c] postpone fork_after_authentication until command execution, request/patch from jahakala@cc.jyu.fi via damien@ibs.com.au plus: use daemon() for backgrounding
525 lines
13 KiB
C
525 lines
13 KiB
C
/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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* Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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* All rights reserved
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* Created: Mon Mar 27 02:26:40 1995 ylo
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* Identity and host key generation and maintenance.
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*/
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#include "includes.h"
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RCSID("$Id: ssh-keygen.c,v 1.10 1999/11/25 00:54:59 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 "fingerprint.h"
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/* Generated private key. */
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RSA *private_key;
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/* Generated public key. */
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RSA *public_key;
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/* Number of bits in the RSA key. This value can be changed on the command line. */
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int bits = 1024;
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/*
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* Flag indicating that we just want to change the passphrase. This can be
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* set on the command line.
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*/
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int change_passphrase = 0;
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/*
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* Flag indicating that we just want to change the comment. This can be set
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* on the command line.
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*/
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int change_comment = 0;
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int quiet = 0;
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/* Flag indicating that we just want to see the key fingerprint */
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int print_fingerprint = 0;
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/* The identity file name, given on the command line or entered by the user. */
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char identity_file[1024];
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int have_identity = 0;
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/* This is set to the passphrase if given on the command line. */
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char *identity_passphrase = NULL;
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/* This is set to the new passphrase if given on the command line. */
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char *identity_new_passphrase = NULL;
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/* This is set to the new comment if given on the command line. */
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char *identity_comment = NULL;
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/* argv0 */
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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-keygen";
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#endif /* HAVE___PROGNAME */
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void
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ask_filename(struct passwd *pw, const char *prompt)
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{
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char buf[1024];
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snprintf(identity_file, sizeof(identity_file), "%s/%s",
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pw->pw_dir, SSH_CLIENT_IDENTITY);
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printf("%s (%s): ", prompt, identity_file);
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fflush(stdout);
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if (fgets(buf, sizeof(buf), stdin) == NULL)
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exit(1);
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if (strchr(buf, '\n'))
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*strchr(buf, '\n') = 0;
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if (strcmp(buf, "") != 0)
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strlcpy(identity_file, buf, sizeof(identity_file));
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have_identity = 1;
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}
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void
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do_fingerprint(struct passwd *pw)
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{
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char *comment;
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RSA *public_key;
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struct stat st;
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if (!have_identity)
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ask_filename(pw, "Enter file in which the key is");
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if (stat(identity_file, &st) < 0) {
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perror(identity_file);
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exit(1);
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}
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public_key = RSA_new();
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if (!load_public_key(identity_file, public_key, &comment)) {
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char *cp, line[1024];
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BIGNUM *e, *n;
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int dummy, invalid = 0;
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FILE *f = fopen(identity_file, "r");
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n = BN_new();
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e = BN_new();
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if (f && fgets(line, sizeof(line), f)) {
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cp = line;
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line[strlen(line) - 1] = '\0';
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if (auth_rsa_read_key(&cp, &dummy, e, n)) {
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public_key->e = e;
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public_key->n = n;
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comment = xstrdup(cp ? cp : "no comment");
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} else {
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invalid = 1;
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}
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} else {
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invalid = 1;
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}
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if (invalid) {
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printf("%s is not a valid key file.\n", identity_file);
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BN_free(e);
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BN_free(n);
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exit(1);
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}
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}
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printf("%d %s %s\n", BN_num_bits(public_key->n),
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fingerprint(public_key->e, public_key->n),
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comment);
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RSA_free(public_key);
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exit(0);
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}
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/*
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* Perform changing a passphrase. The argument is the passwd structure
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* for the current user.
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*/
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void
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do_change_passphrase(struct passwd *pw)
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{
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char *comment;
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char *old_passphrase, *passphrase1, *passphrase2;
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struct stat st;
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RSA *private_key;
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if (!have_identity)
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ask_filename(pw, "Enter file in which the key is");
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if (stat(identity_file, &st) < 0) {
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perror(identity_file);
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exit(1);
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}
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public_key = RSA_new();
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if (!load_public_key(identity_file, public_key, NULL)) {
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printf("%s is not a valid key file.\n", identity_file);
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exit(1);
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}
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/* Clear the public key since we are just about to load the whole file. */
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RSA_free(public_key);
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/* Try to load the file with empty passphrase. */
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private_key = RSA_new();
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if (!load_private_key(identity_file, "", private_key, &comment)) {
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if (identity_passphrase)
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old_passphrase = xstrdup(identity_passphrase);
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else
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old_passphrase = read_passphrase("Enter old passphrase: ", 1);
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if (!load_private_key(identity_file, old_passphrase, private_key, &comment)) {
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memset(old_passphrase, 0, strlen(old_passphrase));
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xfree(old_passphrase);
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printf("Bad passphrase.\n");
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exit(1);
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}
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memset(old_passphrase, 0, strlen(old_passphrase));
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xfree(old_passphrase);
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}
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printf("Key has comment '%s'\n", comment);
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/* Ask the new passphrase (twice). */
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if (identity_new_passphrase) {
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passphrase1 = xstrdup(identity_new_passphrase);
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passphrase2 = NULL;
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} else {
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passphrase1 =
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read_passphrase("Enter new passphrase (empty for no passphrase): ", 1);
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passphrase2 = read_passphrase("Enter same passphrase again: ", 1);
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/* Verify that they are the same. */
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if (strcmp(passphrase1, passphrase2) != 0) {
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memset(passphrase1, 0, strlen(passphrase1));
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memset(passphrase2, 0, strlen(passphrase2));
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xfree(passphrase1);
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xfree(passphrase2);
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printf("Pass phrases do not match. Try again.\n");
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exit(1);
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}
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/* Destroy the other copy. */
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memset(passphrase2, 0, strlen(passphrase2));
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xfree(passphrase2);
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}
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/* Save the file using the new passphrase. */
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if (!save_private_key(identity_file, passphrase1, private_key, comment)) {
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printf("Saving the key failed: %s: %s.\n",
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identity_file, strerror(errno));
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memset(passphrase1, 0, strlen(passphrase1));
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xfree(passphrase1);
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RSA_free(private_key);
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xfree(comment);
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exit(1);
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}
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/* Destroy the passphrase and the copy of the key in memory. */
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memset(passphrase1, 0, strlen(passphrase1));
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xfree(passphrase1);
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RSA_free(private_key); /* Destroys contents */
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xfree(comment);
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printf("Your identification has been saved with the new passphrase.\n");
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exit(0);
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}
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/*
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* Change the comment of a private key file.
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*/
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void
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do_change_comment(struct passwd *pw)
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{
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char new_comment[1024], *comment;
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RSA *private_key;
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char *passphrase;
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struct stat st;
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FILE *f;
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char *tmpbuf;
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if (!have_identity)
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ask_filename(pw, "Enter file in which the key is");
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if (stat(identity_file, &st) < 0) {
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perror(identity_file);
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exit(1);
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}
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/*
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* Try to load the public key from the file the verify that it is
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* readable and of the proper format.
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*/
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public_key = RSA_new();
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if (!load_public_key(identity_file, public_key, NULL)) {
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printf("%s is not a valid key file.\n", identity_file);
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exit(1);
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}
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private_key = RSA_new();
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if (load_private_key(identity_file, "", private_key, &comment))
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passphrase = xstrdup("");
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else {
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if (identity_passphrase)
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passphrase = xstrdup(identity_passphrase);
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else if (identity_new_passphrase)
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passphrase = xstrdup(identity_new_passphrase);
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else
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passphrase = read_passphrase("Enter passphrase: ", 1);
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/* Try to load using the passphrase. */
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if (!load_private_key(identity_file, passphrase, private_key, &comment)) {
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memset(passphrase, 0, strlen(passphrase));
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xfree(passphrase);
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printf("Bad passphrase.\n");
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exit(1);
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}
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}
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printf("Key now has comment '%s'\n", comment);
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if (identity_comment) {
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strlcpy(new_comment, identity_comment, sizeof(new_comment));
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} else {
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printf("Enter new comment: ");
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fflush(stdout);
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if (!fgets(new_comment, sizeof(new_comment), stdin)) {
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memset(passphrase, 0, strlen(passphrase));
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RSA_free(private_key);
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exit(1);
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}
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if (strchr(new_comment, '\n'))
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*strchr(new_comment, '\n') = 0;
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}
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/* Save the file using the new passphrase. */
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if (!save_private_key(identity_file, passphrase, private_key, new_comment)) {
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printf("Saving the key failed: %s: %s.\n",
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identity_file, strerror(errno));
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memset(passphrase, 0, strlen(passphrase));
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xfree(passphrase);
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RSA_free(private_key);
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xfree(comment);
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exit(1);
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}
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memset(passphrase, 0, strlen(passphrase));
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xfree(passphrase);
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RSA_free(private_key);
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strlcat(identity_file, ".pub", sizeof(identity_file));
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f = fopen(identity_file, "w");
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if (!f) {
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printf("Could not save your public key in %s\n", identity_file);
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exit(1);
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}
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fprintf(f, "%d ", BN_num_bits(public_key->n));
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tmpbuf = BN_bn2dec(public_key->e);
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fprintf(f, "%s ", tmpbuf);
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free(tmpbuf);
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tmpbuf = BN_bn2dec(public_key->n);
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fprintf(f, "%s %s\n", tmpbuf, new_comment);
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free(tmpbuf);
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fclose(f);
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xfree(comment);
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printf("The comment in your key file has been changed.\n");
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exit(0);
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}
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void
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usage(void)
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{
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printf("ssh-keygen version %s\n", SSH_VERSION);
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printf("Usage: %s [-b bits] [-p] [-c] [-f file] [-P pass] [-N new-pass] [-C comment]\n", __progname);
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exit(1);
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}
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/*
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* Main program for key management.
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*/
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int
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main(int ac, char **av)
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{
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char dotsshdir[16 * 1024], comment[1024], *passphrase1, *passphrase2;
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struct passwd *pw;
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char *tmpbuf;
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int opt;
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struct stat st;
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FILE *f;
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char hostname[MAXHOSTNAMELEN];
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extern int optind;
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extern char *optarg;
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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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/* we need this for the home * directory. */
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pw = getpwuid(getuid());
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if (!pw) {
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printf("You don't exist, go away!\n");
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exit(1);
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}
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while ((opt = getopt(ac, av, "qpclb:f:P:N:C:")) != EOF) {
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switch (opt) {
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case 'b':
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bits = atoi(optarg);
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if (bits < 512 || bits > 32768) {
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printf("Bits has bad value.\n");
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exit(1);
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}
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break;
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case 'l':
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print_fingerprint = 1;
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break;
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case 'p':
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change_passphrase = 1;
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break;
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case 'c':
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change_comment = 1;
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break;
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case 'f':
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strlcpy(identity_file, optarg, sizeof(identity_file));
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have_identity = 1;
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break;
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case 'P':
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identity_passphrase = optarg;
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break;
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case 'N':
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identity_new_passphrase = optarg;
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break;
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case 'C':
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identity_comment = optarg;
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break;
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case 'q':
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quiet = 1;
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break;
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case '?':
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default:
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usage();
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}
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}
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if (optind < ac) {
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printf("Too many arguments.\n");
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usage();
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}
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if (change_passphrase && change_comment) {
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printf("Can only have one of -p and -c.\n");
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usage();
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}
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if (print_fingerprint)
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do_fingerprint(pw);
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if (change_passphrase)
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do_change_passphrase(pw);
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if (change_comment)
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do_change_comment(pw);
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arc4random_stir();
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if (quiet)
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rsa_set_verbose(0);
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/* Generate the rsa key pair. */
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private_key = RSA_new();
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public_key = RSA_new();
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rsa_generate_key(private_key, public_key, bits);
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if (!have_identity)
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ask_filename(pw, "Enter file in which to save the key");
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/* Create ~/.ssh directory if it doesn\'t already exist. */
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snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, SSH_USER_DIR);
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if (strstr(identity_file, dotsshdir) != NULL &&
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stat(dotsshdir, &st) < 0) {
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if (mkdir(dotsshdir, 0755) < 0)
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error("Could not create directory '%s'.", dotsshdir);
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else if (!quiet)
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printf("Created directory '%s'.\n", dotsshdir);
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}
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/* If the file already exists, ask the user to confirm. */
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if (stat(identity_file, &st) >= 0) {
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char yesno[3];
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printf("%s already exists.\n", identity_file);
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printf("Overwrite (y/n)? ");
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fflush(stdout);
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if (fgets(yesno, sizeof(yesno), stdin) == NULL)
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exit(1);
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if (yesno[0] != 'y' && yesno[0] != 'Y')
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exit(1);
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}
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/* Ask for a passphrase (twice). */
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if (identity_passphrase)
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passphrase1 = xstrdup(identity_passphrase);
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else if (identity_new_passphrase)
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passphrase1 = xstrdup(identity_new_passphrase);
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else {
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passphrase_again:
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passphrase1 =
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read_passphrase("Enter passphrase (empty for no passphrase): ", 1);
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passphrase2 = read_passphrase("Enter same passphrase again: ", 1);
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if (strcmp(passphrase1, passphrase2) != 0) {
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/* The passphrases do not match. Clear them and retry. */
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memset(passphrase1, 0, strlen(passphrase1));
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memset(passphrase2, 0, strlen(passphrase2));
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xfree(passphrase1);
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xfree(passphrase2);
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printf("Passphrases do not match. Try again.\n");
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goto passphrase_again;
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}
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/* Clear the other copy of the passphrase. */
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memset(passphrase2, 0, strlen(passphrase2));
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xfree(passphrase2);
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}
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if (identity_comment) {
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strlcpy(comment, identity_comment, sizeof(comment));
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} else {
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/* Create default commend field for the passphrase. */
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if (gethostname(hostname, sizeof(hostname)) < 0) {
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perror("gethostname");
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exit(1);
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}
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snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname);
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}
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/* Save the key with the given passphrase and comment. */
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if (!save_private_key(identity_file, passphrase1, private_key, comment)) {
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printf("Saving the key failed: %s: %s.\n",
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identity_file, strerror(errno));
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memset(passphrase1, 0, strlen(passphrase1));
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xfree(passphrase1);
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exit(1);
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}
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/* Clear the passphrase. */
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memset(passphrase1, 0, strlen(passphrase1));
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xfree(passphrase1);
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/* Clear the private key and the random number generator. */
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RSA_free(private_key);
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arc4random_stir();
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if (!quiet)
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printf("Your identification has been saved in %s.\n", identity_file);
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strlcat(identity_file, ".pub", sizeof(identity_file));
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f = fopen(identity_file, "w");
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if (!f) {
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printf("Could not save your public key in %s\n", identity_file);
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exit(1);
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}
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fprintf(f, "%d ", BN_num_bits(public_key->n));
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tmpbuf = BN_bn2dec(public_key->e);
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fprintf(f, "%s ", tmpbuf);
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free(tmpbuf);
|
|
tmpbuf = BN_bn2dec(public_key->n);
|
|
fprintf(f, "%s %s\n", tmpbuf, comment);
|
|
free(tmpbuf);
|
|
fclose(f);
|
|
|
|
if (!quiet) {
|
|
printf("Your public key has been saved in %s.\n", identity_file);
|
|
printf("The key fingerprint is:\n");
|
|
printf("%d %s %s\n", BN_num_bits(public_key->n),
|
|
fingerprint(public_key->e, public_key->n),
|
|
comment);
|
|
}
|
|
exit(0);
|
|
}
|