version 1.5, 1999/09/29 21:14:16 |
version 1.37, 2000/12/22 16:49:40 |
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/* |
/* |
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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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* Identity and host key generation and maintenance. |
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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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ssh-keygen.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" |
#include "includes.h" |
RCSID("$Id$"); |
RCSID("$OpenBSD$"); |
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#include "rsa.h" |
#include <openssl/evp.h> |
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#include <openssl/pem.h> |
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#include <openssl/rsa.h> |
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#include <openssl/dsa.h> |
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#include "ssh.h" |
#include "ssh.h" |
#include "xmalloc.h" |
#include "xmalloc.h" |
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#include "key.h" |
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#include "rsa.h" |
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#include "authfile.h" |
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#include "uuencode.h" |
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/* Generated private key. */ |
#include "buffer.h" |
RSA *private_key; |
#include "bufaux.h" |
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/* Generated public key. */ |
/* Number of bits in the RSA/DSA key. This value can be changed on the command line. */ |
RSA *public_key; |
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/* Number of bits in the RSA key. This value can be changed on the command |
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line. */ |
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int bits = 1024; |
int bits = 1024; |
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/* Flag indicating that we just want to change the passphrase. This can be |
/* |
set on the command line. */ |
* 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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*/ |
int change_passphrase = 0; |
int change_passphrase = 0; |
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/* Flag indicating that we just want to change the comment. This can be set |
/* |
on the command line. */ |
* 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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*/ |
int change_comment = 0; |
int change_comment = 0; |
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int quiet = 0; |
int quiet = 0; |
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/* This is set to the identity file name if given on the command line. */ |
/* Flag indicating that we just want to see the key fingerprint */ |
char *identity_file = NULL; |
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. */ |
/* This is set to the passphrase if given on the command line. */ |
char *identity_passphrase = NULL; |
char *identity_passphrase = NULL; |
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/* This is set to the new comment if given on the command line. */ |
/* This is set to the new comment if given on the command line. */ |
char *identity_comment = NULL; |
char *identity_comment = NULL; |
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/* Perform changing a passphrase. The argument is the passwd structure |
/* Dump public key file in format used by real and the original SSH 2 */ |
for the current user. */ |
int convert_to_ssh2 = 0; |
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int convert_from_ssh2 = 0; |
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int print_public = 0; |
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/* default to RSA for SSH-1 */ |
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char *key_type_name = "rsa1"; |
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/* argv0 */ |
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extern char *__progname; |
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char hostname[MAXHOSTNAMELEN]; |
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void |
void |
do_change_passphrase(struct passwd *pw) |
ask_filename(struct passwd *pw, const char *prompt) |
{ |
{ |
char buf[1024], *comment; |
char buf[1024]; |
char *old_passphrase, *passphrase1, *passphrase2; |
char *name = NULL; |
struct stat st; |
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RSA *private_key; |
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/* Read key file name. */ |
switch (key_type_from_name(key_type_name)) { |
if (identity_file != NULL) { |
case KEY_RSA1: |
strncpy(buf, identity_file, sizeof(buf)); |
name = SSH_CLIENT_IDENTITY; |
buf[sizeof(buf) - 1] = '\0'; |
break; |
} else { |
case KEY_DSA: |
printf("Enter file in which the key is ($HOME/%s): ", SSH_CLIENT_IDENTITY); |
name = SSH_CLIENT_ID_DSA; |
fflush(stdout); |
break; |
if (fgets(buf, sizeof(buf), stdin) == NULL) |
case KEY_RSA: |
exit(1); |
name = SSH_CLIENT_ID_RSA; |
if (strchr(buf, '\n')) |
break; |
*strchr(buf, '\n') = 0; |
default: |
if (strcmp(buf, "") == 0) |
fprintf(stderr, "bad key type"); |
snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir, SSH_CLIENT_IDENTITY); |
exit(1); |
} |
break; |
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} |
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snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name); |
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fprintf(stderr, "%s (%s): ", prompt, identity_file); |
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fflush(stderr); |
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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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/* Check if the file exists. */ |
int |
if (stat(buf, &st) < 0) |
try_load_key(char *filename, Key *k) |
{ |
{ |
perror(buf); |
int success = 1; |
exit(1); |
if (!load_private_key(filename, "", k, NULL)) { |
} |
char *pass = read_passphrase("Enter passphrase: ", 1); |
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if (!load_private_key(filename, pass, k, NULL)) { |
/* Try to load the public key from the file the verify that it is |
success = 0; |
readable and of the proper format. */ |
} |
public_key = RSA_new(); |
memset(pass, 0, strlen(pass)); |
if (!load_public_key(buf, public_key, NULL)) |
xfree(pass); |
{ |
} |
printf("%s is not a valid key file.\n", buf); |
return success; |
exit(1); |
} |
} |
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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. */ |
#define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" |
private_key = RSA_new(); |
#define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" |
if (!load_private_key(buf, "", private_key, &comment)) { |
#define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" |
/* Read passphrase from the user. */ |
#define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb |
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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/* Try to load using the passphrase. */ |
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if (!load_private_key(buf, old_passphrase, private_key, &comment)) |
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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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printf("Bad passphrase.\n"); |
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exit(1); |
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} |
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/* Destroy the passphrase. */ |
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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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{ |
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passphrase1 = xstrdup(identity_new_passphrase); |
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passphrase2 = NULL; |
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} |
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else |
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{ |
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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. */ |
void |
if (strcmp(passphrase1, passphrase2) != 0) |
do_convert_to_ssh2(struct passwd *pw) |
{ |
{ |
memset(passphrase1, 0, strlen(passphrase1)); |
Key *k; |
memset(passphrase2, 0, strlen(passphrase2)); |
int len; |
xfree(passphrase1); |
u_char *blob; |
xfree(passphrase2); |
struct stat st; |
printf("Pass phrases do not match. Try again.\n"); |
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exit(1); |
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); |
} |
} |
/* Destroy the other copy. */ |
k = key_new(KEY_UNSPEC); |
memset(passphrase2, 0, strlen(passphrase2)); |
if (!try_load_key(identity_file, k)) { |
xfree(passphrase2); |
fprintf(stderr, "load failed\n"); |
} |
exit(1); |
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} |
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key_to_blob(k, &blob, &len); |
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fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); |
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fprintf(stdout, |
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"Comment: \"%d-bit %s, converted from OpenSSH by %s@%s\"\n", |
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key_size(k), key_type(k), |
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pw->pw_name, hostname); |
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dump_base64(stdout, blob, len); |
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fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); |
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key_free(k); |
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xfree(blob); |
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exit(0); |
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} |
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/* Save the file using the new passphrase. */ |
void |
if (!save_private_key(buf, passphrase1, private_key, comment)) |
buffer_get_bignum_bits(Buffer *b, BIGNUM *value) |
{ |
{ |
printf("Saving the key failed: %s: %s.\n", |
int bits = buffer_get_int(b); |
buf, strerror(errno)); |
int bytes = (bits + 7) / 8; |
memset(passphrase1, 0, strlen(passphrase1)); |
if (buffer_len(b) < bytes) |
xfree(passphrase1); |
fatal("buffer_get_bignum_bits: input buffer too small"); |
RSA_free(private_key); |
BN_bin2bn((u_char *)buffer_ptr(b), bytes, value); |
xfree(comment); |
buffer_consume(b, bytes); |
exit(1); |
} |
} |
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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"); |
Key * |
exit(0); |
do_convert_private_ssh2_from_blob(char *blob, int blen) |
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{ |
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Buffer b; |
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DSA *dsa; |
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Key *key = NULL; |
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int ignore, magic, rlen; |
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char *type, *cipher; |
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buffer_init(&b); |
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buffer_append(&b, blob, blen); |
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magic = buffer_get_int(&b); |
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if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { |
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error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC); |
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buffer_free(&b); |
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return NULL; |
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} |
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ignore = buffer_get_int(&b); |
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type = buffer_get_string(&b, NULL); |
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cipher = buffer_get_string(&b, NULL); |
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ignore = buffer_get_int(&b); |
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ignore = buffer_get_int(&b); |
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ignore = buffer_get_int(&b); |
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xfree(type); |
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if (strcmp(cipher, "none") != 0) { |
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error("unsupported cipher %s", cipher); |
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xfree(cipher); |
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buffer_free(&b); |
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return NULL; |
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} |
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xfree(cipher); |
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key = key_new(KEY_DSA); |
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dsa = key->dsa; |
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dsa->priv_key = BN_new(); |
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if (dsa->priv_key == NULL) { |
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error("alloc priv_key failed"); |
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key_free(key); |
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return NULL; |
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} |
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buffer_get_bignum_bits(&b, dsa->p); |
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buffer_get_bignum_bits(&b, dsa->g); |
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buffer_get_bignum_bits(&b, dsa->q); |
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buffer_get_bignum_bits(&b, dsa->pub_key); |
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buffer_get_bignum_bits(&b, dsa->priv_key); |
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rlen = buffer_len(&b); |
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if(rlen != 0) |
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error("do_convert_private_ssh2_from_blob: remaining bytes in key blob %d", rlen); |
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buffer_free(&b); |
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return key; |
} |
} |
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/* Change the comment of a private key file. */ |
void |
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do_convert_from_ssh2(struct passwd *pw) |
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{ |
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Key *k; |
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int blen; |
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char line[1024], *p; |
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char blob[8096]; |
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char encoded[8096]; |
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struct stat st; |
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int escaped = 0, private = 0, ok; |
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FILE *fp; |
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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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fp = fopen(identity_file, "r"); |
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if (fp == NULL) { |
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perror(identity_file); |
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exit(1); |
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} |
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encoded[0] = '\0'; |
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while (fgets(line, sizeof(line), fp)) { |
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if (!(p = strchr(line, '\n'))) { |
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fprintf(stderr, "input line too long.\n"); |
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exit(1); |
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} |
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if (p > line && p[-1] == '\\') |
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escaped++; |
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if (strncmp(line, "----", 4) == 0 || |
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strstr(line, ": ") != NULL) { |
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if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) |
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private = 1; |
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fprintf(stderr, "ignore: %s", line); |
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continue; |
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} |
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if (escaped) { |
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escaped--; |
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fprintf(stderr, "escaped: %s", line); |
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continue; |
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} |
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*p = '\0'; |
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strlcat(encoded, line, sizeof(encoded)); |
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} |
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blen = uudecode(encoded, (u_char *)blob, sizeof(blob)); |
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if (blen < 0) { |
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fprintf(stderr, "uudecode failed.\n"); |
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exit(1); |
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} |
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k = private ? |
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do_convert_private_ssh2_from_blob(blob, blen) : |
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key_from_blob(blob, blen); |
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if (k == NULL) { |
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fprintf(stderr, "decode blob failed.\n"); |
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exit(1); |
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} |
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ok = private ? |
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PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, NULL, 0, NULL, NULL) : |
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key_write(k, stdout); |
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if (!ok) { |
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fprintf(stderr, "key write failed"); |
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exit(1); |
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} |
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key_free(k); |
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fprintf(stdout, "\n"); |
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fclose(fp); |
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exit(0); |
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} |
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void |
void |
do_change_comment(struct passwd *pw) |
do_print_public(struct passwd *pw) |
{ |
{ |
char buf[1024], new_comment[1024], *comment; |
Key *k; |
RSA *private_key; |
struct stat st; |
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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/* Read key file name. */ |
if (!have_identity) |
if (identity_file) |
ask_filename(pw, "Enter file in which the key is"); |
{ |
if (stat(identity_file, &st) < 0) { |
strncpy(buf, identity_file, sizeof(buf)); |
perror(identity_file); |
buf[sizeof(buf) - 1] = '\0'; |
exit(1); |
} |
} |
else |
k = key_new(KEY_UNSPEC); |
{ |
if (!try_load_key(identity_file, k)) { |
printf("Enter file in which the key is ($HOME/%s): ", |
fprintf(stderr, "load failed\n"); |
SSH_CLIENT_IDENTITY); |
exit(1); |
fflush(stdout); |
} |
if (fgets(buf, sizeof(buf), stdin) == NULL) |
if (!key_write(k, stdout)) |
exit(1); |
fprintf(stderr, "key_write failed"); |
if (strchr(buf, '\n')) |
key_free(k); |
*strchr(buf, '\n') = 0; |
fprintf(stdout, "\n"); |
if (strcmp(buf, "") == 0) |
exit(0); |
snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir, SSH_CLIENT_IDENTITY); |
} |
} |
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/* Check if the file exists. */ |
void |
if (stat(buf, &st) < 0) |
do_fingerprint(struct passwd *pw) |
{ |
{ |
perror(buf); |
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exit(1); |
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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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public_key = RSA_new(); |
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if (!load_public_key(buf, public_key, NULL)) |
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{ |
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printf("%s is not a valid key file.\n", buf); |
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exit(1); |
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} |
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private_key = RSA_new(); |
FILE *f; |
/* Try to load the file with empty passphrase. */ |
Key *public; |
if (load_private_key(buf, "", private_key, &comment)) |
char *comment = NULL, *cp, *ep, line[16*1024]; |
passphrase = xstrdup(""); |
int i, skip = 0, num = 1, invalid = 1, success = 0; |
else |
u_int ignore; |
{ |
struct stat st; |
/* Read passphrase from the user. */ |
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if (identity_passphrase) |
if (!have_identity) |
passphrase = xstrdup(identity_passphrase); |
ask_filename(pw, "Enter file in which the key is"); |
else |
if (stat(identity_file, &st) < 0) { |
if (identity_new_passphrase) |
perror(identity_file); |
passphrase = xstrdup(identity_new_passphrase); |
exit(1); |
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(buf, passphrase, private_key, &comment)) |
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{ |
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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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} |
} |
} |
public = key_new(KEY_RSA1); |
printf("Key now has comment '%s'\n", comment); |
if (load_public_key(identity_file, public, &comment)) { |
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success = 1; |
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} else { |
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key_free(public); |
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public = key_new(KEY_UNSPEC); |
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if (try_load_public_key(identity_file, public, &comment)) |
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success = 1; |
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else |
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error("try_load_public_key KEY_UNSPEC failed"); |
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} |
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if (success) { |
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printf("%d %s %s\n", key_size(public), key_fingerprint(public), comment); |
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key_free(public); |
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xfree(comment); |
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exit(0); |
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} |
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if (identity_comment) |
/* XXX RSA1 only */ |
{ |
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strncpy(new_comment, identity_comment, sizeof(new_comment)); |
public = key_new(KEY_RSA1); |
new_comment[sizeof(new_comment) - 1] = '\0'; |
f = fopen(identity_file, "r"); |
} |
if (f != NULL) { |
else |
while (fgets(line, sizeof(line), f)) { |
{ |
i = strlen(line) - 1; |
printf("Enter new comment: "); |
if (line[i] != '\n') { |
fflush(stdout); |
error("line %d too long: %.40s...", num, line); |
if (!fgets(new_comment, sizeof(new_comment), stdin)) |
skip = 1; |
{ |
continue; |
memset(passphrase, 0, strlen(passphrase)); |
} |
RSA_free(private_key); |
num++; |
exit(1); |
if (skip) { |
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skip = 0; |
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continue; |
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} |
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line[i] = '\0'; |
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/* Skip leading whitespace, empty and comment lines. */ |
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for (cp = line; *cp == ' ' || *cp == '\t'; cp++) |
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; |
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if (!*cp || *cp == '\n' || *cp == '#') |
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continue ; |
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i = strtol(cp, &ep, 10); |
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if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) { |
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int quoted = 0; |
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comment = cp; |
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for (; *cp && (quoted || (*cp != ' ' && *cp != '\t')); cp++) { |
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if (*cp == '\\' && cp[1] == '"') |
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cp++; /* Skip both */ |
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else if (*cp == '"') |
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quoted = !quoted; |
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} |
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if (!*cp) |
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continue; |
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*cp++ = '\0'; |
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} |
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ep = cp; |
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if (auth_rsa_read_key(&cp, &ignore, public->rsa->e, public->rsa->n)) { |
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invalid = 0; |
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comment = *cp ? cp : comment; |
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printf("%d %s %s\n", key_size(public), |
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key_fingerprint(public), |
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comment ? comment : "no comment"); |
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} |
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} |
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fclose(f); |
} |
} |
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key_free(public); |
/* Remove terminating newline from comment. */ |
if (invalid) { |
if (strchr(new_comment, '\n')) |
printf("%s is not a valid key file.\n", identity_file); |
*strchr(new_comment, '\n') = 0; |
exit(1); |
} |
} |
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exit(0); |
/* Save the file using the new passphrase. */ |
} |
if (!save_private_key(buf, passphrase, private_key, new_comment)) |
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{ |
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printf("Saving the key failed: %s: %s.\n", |
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buf, 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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|
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/* Destroy the passphrase and the private key in memory. */ |
/* |
memset(passphrase, 0, strlen(passphrase)); |
* Perform changing a passphrase. The argument is the passwd structure |
xfree(passphrase); |
* for the current user. |
RSA_free(private_key); |
*/ |
|
void |
|
do_change_passphrase(struct passwd *pw) |
|
{ |
|
char *comment; |
|
char *old_passphrase, *passphrase1, *passphrase2; |
|
struct stat st; |
|
Key *private; |
|
Key *public; |
|
int type = KEY_RSA1; |
|
|
/* Save the public key in text format in a file with the same name but |
if (!have_identity) |
.pub appended. */ |
ask_filename(pw, "Enter file in which the key is"); |
strcat(buf, ".pub"); |
if (stat(identity_file, &st) < 0) { |
f = fopen(buf, "w"); |
perror(identity_file); |
if (!f) |
exit(1); |
{ |
} |
printf("Could not save your public key in %s\n", buf); |
public = key_new(type); |
exit(1); |
if (!load_public_key(identity_file, public, NULL)) { |
} |
type = KEY_UNSPEC; |
fprintf(f, "%d ", BN_num_bits(public_key->n)); |
} else { |
tmpbuf = BN_bn2dec(public_key->e); |
/* Clear the public key since we are just about to load the whole file. */ |
fprintf(f, "%s ", tmpbuf); |
key_free(public); |
free (tmpbuf); |
} |
tmpbuf = BN_bn2dec(public_key->n); |
/* Try to load the file with empty passphrase. */ |
fprintf(f, "%s %s\n", tmpbuf, new_comment); |
private = key_new(type); |
free (tmpbuf); |
if (!load_private_key(identity_file, "", private, &comment)) { |
fclose(f); |
if (identity_passphrase) |
|
old_passphrase = xstrdup(identity_passphrase); |
|
else |
|
old_passphrase = read_passphrase("Enter old passphrase: ", 1); |
|
if (!load_private_key(identity_file, old_passphrase, private, &comment)) { |
|
memset(old_passphrase, 0, strlen(old_passphrase)); |
|
xfree(old_passphrase); |
|
printf("Bad passphrase.\n"); |
|
exit(1); |
|
} |
|
memset(old_passphrase, 0, strlen(old_passphrase)); |
|
xfree(old_passphrase); |
|
} |
|
printf("Key has comment '%s'\n", comment); |
|
|
xfree(comment); |
/* Ask the new passphrase (twice). */ |
|
if (identity_new_passphrase) { |
|
passphrase1 = xstrdup(identity_new_passphrase); |
|
passphrase2 = NULL; |
|
} else { |
|
passphrase1 = |
|
read_passphrase("Enter new passphrase (empty for no passphrase): ", 1); |
|
passphrase2 = read_passphrase("Enter same passphrase again: ", 1); |
|
|
printf("The comment in your key file has been changed.\n"); |
/* Verify that they are the same. */ |
exit(0); |
if (strcmp(passphrase1, passphrase2) != 0) { |
|
memset(passphrase1, 0, strlen(passphrase1)); |
|
memset(passphrase2, 0, strlen(passphrase2)); |
|
xfree(passphrase1); |
|
xfree(passphrase2); |
|
printf("Pass phrases do not match. Try again.\n"); |
|
exit(1); |
|
} |
|
/* Destroy the other copy. */ |
|
memset(passphrase2, 0, strlen(passphrase2)); |
|
xfree(passphrase2); |
|
} |
|
|
|
/* Save the file using the new passphrase. */ |
|
if (!save_private_key(identity_file, passphrase1, private, comment)) { |
|
printf("Saving the key failed: %s: %s.\n", |
|
identity_file, strerror(errno)); |
|
memset(passphrase1, 0, strlen(passphrase1)); |
|
xfree(passphrase1); |
|
key_free(private); |
|
xfree(comment); |
|
exit(1); |
|
} |
|
/* Destroy the passphrase and the copy of the key in memory. */ |
|
memset(passphrase1, 0, strlen(passphrase1)); |
|
xfree(passphrase1); |
|
key_free(private); /* Destroys contents */ |
|
xfree(comment); |
|
|
|
printf("Your identification has been saved with the new passphrase.\n"); |
|
exit(0); |
} |
} |
|
|
/* Main program for key management. */ |
/* |
|
* Change the comment of a private key file. |
|
*/ |
|
void |
|
do_change_comment(struct passwd *pw) |
|
{ |
|
char new_comment[1024], *comment; |
|
Key *private; |
|
Key *public; |
|
char *passphrase; |
|
struct stat st; |
|
FILE *f; |
|
|
|
if (!have_identity) |
|
ask_filename(pw, "Enter file in which the key is"); |
|
if (stat(identity_file, &st) < 0) { |
|
perror(identity_file); |
|
exit(1); |
|
} |
|
/* |
|
* Try to load the public key from the file the verify that it is |
|
* readable and of the proper format. |
|
*/ |
|
public = key_new(KEY_RSA1); |
|
if (!load_public_key(identity_file, public, NULL)) { |
|
printf("%s is not a valid key file.\n", identity_file); |
|
exit(1); |
|
} |
|
|
|
private = key_new(KEY_RSA1); |
|
if (load_private_key(identity_file, "", private, &comment)) |
|
passphrase = xstrdup(""); |
|
else { |
|
if (identity_passphrase) |
|
passphrase = xstrdup(identity_passphrase); |
|
else if (identity_new_passphrase) |
|
passphrase = xstrdup(identity_new_passphrase); |
|
else |
|
passphrase = read_passphrase("Enter passphrase: ", 1); |
|
/* Try to load using the passphrase. */ |
|
if (!load_private_key(identity_file, passphrase, private, &comment)) { |
|
memset(passphrase, 0, strlen(passphrase)); |
|
xfree(passphrase); |
|
printf("Bad passphrase.\n"); |
|
exit(1); |
|
} |
|
} |
|
printf("Key now has comment '%s'\n", comment); |
|
|
|
if (identity_comment) { |
|
strlcpy(new_comment, identity_comment, sizeof(new_comment)); |
|
} else { |
|
printf("Enter new comment: "); |
|
fflush(stdout); |
|
if (!fgets(new_comment, sizeof(new_comment), stdin)) { |
|
memset(passphrase, 0, strlen(passphrase)); |
|
key_free(private); |
|
exit(1); |
|
} |
|
if (strchr(new_comment, '\n')) |
|
*strchr(new_comment, '\n') = 0; |
|
} |
|
|
|
/* Save the file using the new passphrase. */ |
|
if (!save_private_key(identity_file, passphrase, private, new_comment)) { |
|
printf("Saving the key failed: %s: %s.\n", |
|
identity_file, strerror(errno)); |
|
memset(passphrase, 0, strlen(passphrase)); |
|
xfree(passphrase); |
|
key_free(private); |
|
xfree(comment); |
|
exit(1); |
|
} |
|
memset(passphrase, 0, strlen(passphrase)); |
|
xfree(passphrase); |
|
key_free(private); |
|
|
|
strlcat(identity_file, ".pub", sizeof(identity_file)); |
|
f = fopen(identity_file, "w"); |
|
if (!f) { |
|
printf("Could not save your public key in %s\n", identity_file); |
|
exit(1); |
|
} |
|
if (!key_write(public, f)) |
|
fprintf(stderr, "write key failed"); |
|
key_free(public); |
|
fprintf(f, " %s\n", new_comment); |
|
fclose(f); |
|
|
|
xfree(comment); |
|
|
|
printf("The comment in your key file has been changed.\n"); |
|
exit(0); |
|
} |
|
|
|
void |
|
usage(void) |
|
{ |
|
printf("Usage: %s [-lpqxXyc] [-t type] [-b bits] [-f file] [-C comment] [-N new-pass] [-P pass]\n", __progname); |
|
exit(1); |
|
} |
|
|
|
/* |
|
* Main program for key management. |
|
*/ |
int |
int |
main(int ac, char **av) |
main(int ac, char **av) |
{ |
{ |
char buf[16384], buf2[1024], *passphrase1, *passphrase2; |
char dotsshdir[16 * 1024], comment[1024], *passphrase1, *passphrase2; |
struct passwd *pw; |
struct passwd *pw; |
char *tmpbuf; |
int opt, type; |
int opt; |
struct stat st; |
struct stat st; |
FILE *f; |
FILE *f; |
Key *private; |
char hostname[MAXHOSTNAMELEN]; |
Key *public; |
extern int optind; |
|
extern char *optarg; |
|
|
|
/* check if RSA support exists */ |
extern int optind; |
if (rsa_alive() == 0) { |
extern char *optarg; |
extern char *__progname; |
|
|
|
fprintf(stderr, |
SSLeay_add_all_algorithms(); |
"%s: no RSA support in libssl and libcrypto. See ssl(8).\n", |
|
__progname); |
|
exit(1); |
|
} |
|
|
|
/* Get user\'s passwd structure. We need this for the home directory. */ |
/* we need this for the home * directory. */ |
pw = getpwuid(getuid()); |
pw = getpwuid(getuid()); |
if (!pw) |
if (!pw) { |
{ |
printf("You don't exist, go away!\n"); |
printf("You don't exist, go away!\n"); |
exit(1); |
exit(1); |
} |
} |
if (gethostname(hostname, sizeof(hostname)) < 0) { |
|
perror("gethostname"); |
|
exit(1); |
|
} |
|
|
/* Create ~/.ssh directory if it doesn\'t already exist. */ |
while ((opt = getopt(ac, av, "dqpclRxXyb:f:t:P:N:C:")) != EOF) { |
snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir, SSH_USER_DIR); |
switch (opt) { |
if (stat(buf, &st) < 0) |
case 'b': |
if (mkdir(buf, 0755) < 0) |
bits = atoi(optarg); |
error("Could not create directory '%s'.", buf); |
if (bits < 512 || bits > 32768) { |
|
printf("Bits has bad value.\n"); |
|
exit(1); |
|
} |
|
break; |
|
|
/* Parse command line arguments. */ |
case 'l': |
while ((opt = getopt(ac, av, "qpcb:f:P:N:C:")) != EOF) |
print_fingerprint = 1; |
{ |
break; |
switch (opt) |
|
{ |
|
case 'b': |
|
bits = atoi(optarg); |
|
if (bits < 512 || bits > 32768) |
|
{ |
|
printf("Bits has bad value.\n"); |
|
exit(1); |
|
} |
|
break; |
|
|
|
case 'p': |
case 'p': |
change_passphrase = 1; |
change_passphrase = 1; |
break; |
break; |
|
|
case 'c': |
case 'c': |
change_comment = 1; |
change_comment = 1; |
break; |
break; |
|
|
case 'f': |
case 'f': |
identity_file = optarg; |
strlcpy(identity_file, optarg, sizeof(identity_file)); |
break; |
have_identity = 1; |
|
break; |
case 'P': |
|
identity_passphrase = optarg; |
|
break; |
|
|
|
case 'N': |
case 'P': |
identity_new_passphrase = optarg; |
identity_passphrase = optarg; |
break; |
break; |
|
|
case 'C': |
case 'N': |
identity_comment = optarg; |
identity_new_passphrase = optarg; |
break; |
break; |
|
|
case 'q': |
case 'C': |
quiet = 1; |
identity_comment = optarg; |
break; |
break; |
|
|
case '?': |
case 'q': |
default: |
quiet = 1; |
printf("ssh-keygen version %s\n", SSH_VERSION); |
break; |
printf("Usage: %s [-b bits] [-p] [-c] [-f file] [-P pass] [-N new-pass] [-C comment]\n", av[0]); |
|
exit(1); |
|
} |
|
} |
|
if (optind < ac) |
|
{ |
|
printf("Too many arguments.\n"); |
|
exit(1); |
|
} |
|
if (change_passphrase && change_comment) |
|
{ |
|
printf("Can only have one of -p and -c.\n"); |
|
exit(1); |
|
} |
|
|
|
/* If the user requested to change the passphrase, do it now. This |
case 'R': |
function never returns. */ |
/* unused */ |
if (change_passphrase) |
exit(0); |
do_change_passphrase(pw); |
break; |
|
|
/* If the user requested to change the comment, do it now. This function |
case 'x': |
never returns. */ |
convert_to_ssh2 = 1; |
if (change_comment) |
break; |
do_change_comment(pw); |
|
|
|
/* Initialize random number generator. This may take a while if the |
case 'X': |
user has no seed file, so display a message to the user. */ |
convert_from_ssh2 = 1; |
if (!quiet) |
break; |
printf("Initializing random number generator...\n"); |
|
arc4random_stir(); |
|
|
|
if (quiet) |
case 'y': |
rsa_set_verbose(0); |
print_public = 1; |
|
break; |
|
|
/* Generate the rsa key pair. */ |
case 'd': |
private_key = RSA_new(); |
key_type_name = "dsa"; |
public_key = RSA_new(); |
break; |
rsa_generate_key(private_key, public_key, bits); |
|
|
|
ask_file_again: |
case 't': |
|
key_type_name = optarg; |
|
break; |
|
|
/* Ask for a file to save the key in. */ |
case '?': |
if (identity_file) |
default: |
{ |
usage(); |
strncpy(buf, identity_file, sizeof(buf)); |
} |
buf[sizeof(buf) - 1] = '\0'; |
} |
} |
if (optind < ac) { |
else |
printf("Too many arguments.\n"); |
{ |
usage(); |
printf("Enter file in which to save the key ($HOME/%s): ", |
} |
SSH_CLIENT_IDENTITY); |
if (change_passphrase && change_comment) { |
fflush(stdout); |
printf("Can only have one of -p and -c.\n"); |
if (fgets(buf, sizeof(buf), stdin) == NULL) |
usage(); |
exit(1); |
} |
if (strchr(buf, '\n')) |
if (print_fingerprint) |
*strchr(buf, '\n') = 0; |
do_fingerprint(pw); |
if (strcmp(buf, "") == 0) |
if (change_passphrase) |
snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir, SSH_CLIENT_IDENTITY); |
do_change_passphrase(pw); |
} |
if (change_comment) |
|
do_change_comment(pw); |
|
if (convert_to_ssh2) |
|
do_convert_to_ssh2(pw); |
|
if (convert_from_ssh2) |
|
do_convert_from_ssh2(pw); |
|
if (print_public) |
|
do_print_public(pw); |
|
|
/* If the file aready exists, ask the user to confirm. */ |
arc4random_stir(); |
if (stat(buf, &st) >= 0) |
|
{ |
|
printf("%s already exists.\n", buf); |
|
printf("Overwrite (y/n)? "); |
|
fflush(stdout); |
|
if (fgets(buf2, sizeof(buf2), stdin) == NULL) |
|
exit(1); |
|
if (buf2[0] != 'y' && buf2[0] != 'Y') |
|
exit(1); |
|
} |
|
|
|
/* Ask for a passphrase (twice). */ |
|
if (identity_passphrase) |
|
passphrase1 = xstrdup(identity_passphrase); |
|
else |
|
if (identity_new_passphrase) |
|
passphrase1 = xstrdup(identity_new_passphrase); |
|
else |
|
{ |
|
passphrase_again: |
|
passphrase1 = |
|
read_passphrase("Enter passphrase (empty for no passphrase): ", 1); |
|
passphrase2 = read_passphrase("Enter same passphrase again: ", 1); |
|
if (strcmp(passphrase1, passphrase2) != 0) |
|
{ |
|
/* The passphrases do not match. Clear them and retry. */ |
|
memset(passphrase1, 0, strlen(passphrase1)); |
|
memset(passphrase2, 0, strlen(passphrase2)); |
|
xfree(passphrase1); |
|
xfree(passphrase2); |
|
printf("Passphrases do not match. Try again.\n"); |
|
goto passphrase_again; |
|
} |
|
/* Clear the other copy of the passphrase. */ |
|
memset(passphrase2, 0, strlen(passphrase2)); |
|
xfree(passphrase2); |
|
} |
|
|
|
/* Create default commend field for the passphrase. The user can later |
type = key_type_from_name(key_type_name); |
edit this field. */ |
if (type == KEY_UNSPEC) { |
if (identity_comment) |
fprintf(stderr, "unknown key type %s\n", key_type_name); |
{ |
exit(1); |
strlcpy(buf2, identity_comment, sizeof(buf2)); |
|
} |
|
else |
|
{ |
|
if (gethostname(hostname, sizeof(hostname)) < 0) |
|
{ |
|
perror("gethostname"); |
|
exit(1); |
|
} |
} |
snprintf(buf2, sizeof buf2, "%s@%s", pw->pw_name, hostname); |
if (!quiet) |
} |
printf("Generating public/private %s key pair.\n", key_type_name); |
|
private = key_generate(type, bits); |
|
if (private == NULL) { |
|
fprintf(stderr, "key_generate failed"); |
|
exit(1); |
|
} |
|
public = key_from_private(private); |
|
|
/* Save the key with the given passphrase and comment. */ |
if (!have_identity) |
if (!save_private_key(buf, passphrase1, private_key, buf2)) |
ask_filename(pw, "Enter file in which to save the key"); |
{ |
|
printf("Saving the key failed: %s: %s.\n", |
|
buf, strerror(errno)); |
|
memset(passphrase1, 0, strlen(passphrase1)); |
|
xfree(passphrase1); |
|
goto ask_file_again; |
|
} |
|
/* Clear the passphrase. */ |
|
memset(passphrase1, 0, strlen(passphrase1)); |
|
xfree(passphrase1); |
|
|
|
/* Clear the private key and the random number generator. */ |
/* Create ~/.ssh directory if it doesn\'t already exist. */ |
RSA_free(private_key); |
snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, SSH_USER_DIR); |
arc4random_stir(); |
if (strstr(identity_file, dotsshdir) != NULL && |
|
stat(dotsshdir, &st) < 0) { |
|
if (mkdir(dotsshdir, 0700) < 0) |
|
error("Could not create directory '%s'.", dotsshdir); |
|
else if (!quiet) |
|
printf("Created directory '%s'.\n", dotsshdir); |
|
} |
|
/* If the file already exists, ask the user to confirm. */ |
|
if (stat(identity_file, &st) >= 0) { |
|
char yesno[3]; |
|
printf("%s already exists.\n", identity_file); |
|
printf("Overwrite (y/n)? "); |
|
fflush(stdout); |
|
if (fgets(yesno, sizeof(yesno), stdin) == NULL) |
|
exit(1); |
|
if (yesno[0] != 'y' && yesno[0] != 'Y') |
|
exit(1); |
|
} |
|
/* Ask for a passphrase (twice). */ |
|
if (identity_passphrase) |
|
passphrase1 = xstrdup(identity_passphrase); |
|
else if (identity_new_passphrase) |
|
passphrase1 = xstrdup(identity_new_passphrase); |
|
else { |
|
passphrase_again: |
|
passphrase1 = |
|
read_passphrase("Enter passphrase (empty for no passphrase): ", 1); |
|
passphrase2 = read_passphrase("Enter same passphrase again: ", 1); |
|
if (strcmp(passphrase1, passphrase2) != 0) { |
|
/* The passphrases do not match. Clear them and retry. */ |
|
memset(passphrase1, 0, strlen(passphrase1)); |
|
memset(passphrase2, 0, strlen(passphrase2)); |
|
xfree(passphrase1); |
|
xfree(passphrase2); |
|
printf("Passphrases do not match. Try again.\n"); |
|
goto passphrase_again; |
|
} |
|
/* Clear the other copy of the passphrase. */ |
|
memset(passphrase2, 0, strlen(passphrase2)); |
|
xfree(passphrase2); |
|
} |
|
|
if (!quiet) |
if (identity_comment) { |
printf("Your identification has been saved in %s.\n", buf); |
strlcpy(comment, identity_comment, sizeof(comment)); |
|
} else { |
|
/* Create default commend field for the passphrase. */ |
|
snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); |
|
} |
|
|
/* Display the public key on the screen. */ |
/* Save the key with the given passphrase and comment. */ |
if (!quiet) { |
if (!save_private_key(identity_file, passphrase1, private, comment)) { |
printf("Your public key is:\n"); |
printf("Saving the key failed: %s: %s.\n", |
printf("%d ", BN_num_bits(public_key->n)); |
identity_file, strerror(errno)); |
tmpbuf = BN_bn2dec(public_key->e); |
memset(passphrase1, 0, strlen(passphrase1)); |
printf("%s ", tmpbuf); |
xfree(passphrase1); |
free(tmpbuf); |
exit(1); |
tmpbuf = BN_bn2dec(public_key->n); |
} |
printf("%s %s\n", tmpbuf, buf2); |
/* Clear the passphrase. */ |
free(tmpbuf); |
memset(passphrase1, 0, strlen(passphrase1)); |
} |
xfree(passphrase1); |
|
|
/* Save the public key in text format in a file with the same name but |
/* Clear the private key and the random number generator. */ |
.pub appended. */ |
key_free(private); |
strcat(buf, ".pub"); |
arc4random_stir(); |
f = fopen(buf, "w"); |
|
if (!f) |
|
{ |
|
printf("Could not save your public key in %s\n", buf); |
|
exit(1); |
|
} |
|
fprintf(f, "%d ", BN_num_bits(public_key->n)); |
|
tmpbuf = BN_bn2dec(public_key->e); |
|
fprintf(f, "%s ", tmpbuf); |
|
free(tmpbuf); |
|
tmpbuf = BN_bn2dec(public_key->n); |
|
fprintf(f, "%s %s\n", tmpbuf, buf2); |
|
free(tmpbuf); |
|
fclose(f); |
|
|
|
if (!quiet) |
if (!quiet) |
printf("Your public key has been saved in %s\n", buf); |
printf("Your identification has been saved in %s.\n", identity_file); |
|
|
exit(0); |
strlcat(identity_file, ".pub", sizeof(identity_file)); |
|
f = fopen(identity_file, "w"); |
|
if (!f) { |
|
printf("Could not save your public key in %s\n", identity_file); |
|
exit(1); |
|
} |
|
if (!key_write(public, f)) |
|
fprintf(stderr, "write key failed"); |
|
fprintf(f, " %s\n", comment); |
|
fclose(f); |
|
|
|
if (!quiet) { |
|
printf("Your public key has been saved in %s.\n", |
|
identity_file); |
|
printf("The key fingerprint is:\n"); |
|
printf("%s %s\n", key_fingerprint(public), comment); |
|
} |
|
|
|
key_free(public); |
|
exit(0); |
} |
} |