1 | /* |
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2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
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3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
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4 | * All rights reserved |
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5 | * Adds an identity to the authentication server, or removes an identity. |
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6 | * |
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7 | * As far as I am concerned, the code I have written for this software |
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8 | * can be used freely for any purpose. Any derived versions of this |
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9 | * software must be clearly marked as such, and if the derived work is |
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10 | * incompatible with the protocol description in the RFC file, it must be |
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11 | * called by a name other than "ssh" or "Secure Shell". |
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12 | * |
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13 | * SSH2 implementation, |
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14 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
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15 | * |
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16 | * Redistribution and use in source and binary forms, with or without |
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17 | * modification, are permitted provided that the following conditions |
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18 | * are met: |
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19 | * 1. Redistributions of source code must retain the above copyright |
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20 | * notice, this list of conditions and the following disclaimer. |
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21 | * 2. Redistributions in binary form must reproduce the above copyright |
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22 | * notice, this list of conditions and the following disclaimer in the |
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23 | * documentation and/or other materials provided with the distribution. |
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24 | * |
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25 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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26 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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27 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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28 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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29 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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30 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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31 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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32 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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33 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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34 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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35 | */ |
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36 | |
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37 | #include "includes.h" |
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38 | RCSID("$OpenBSD: ssh-add.c,v 1.45 2001/08/03 10:31:30 jakob Exp $"); |
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39 | |
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40 | #include <openssl/evp.h> |
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41 | |
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42 | #include "ssh.h" |
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43 | #include "rsa.h" |
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44 | #include "log.h" |
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45 | #include "xmalloc.h" |
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46 | #include "key.h" |
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47 | #include "authfd.h" |
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48 | #include "authfile.h" |
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49 | #include "pathnames.h" |
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50 | #include "readpass.h" |
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51 | |
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52 | #ifdef HAVE___PROGNAME |
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53 | extern char *__progname; |
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54 | #else |
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55 | char *__progname; |
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56 | #endif |
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57 | |
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58 | /* argv0 */ |
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59 | extern char *__progname; |
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60 | |
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61 | /* we keep a cache of one passphrases */ |
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62 | static char *pass = NULL; |
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63 | static void |
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64 | clear_pass(void) |
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65 | { |
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66 | if (pass) { |
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67 | memset(pass, 0, strlen(pass)); |
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68 | xfree(pass); |
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69 | pass = NULL; |
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70 | } |
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71 | } |
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72 | |
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73 | static void |
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74 | delete_file(AuthenticationConnection *ac, const char *filename) |
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75 | { |
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76 | Key *public; |
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77 | char *comment = NULL; |
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78 | |
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79 | public = key_load_public(filename, &comment); |
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80 | if (public == NULL) { |
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81 | printf("Bad key file %s\n", filename); |
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82 | return; |
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83 | } |
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84 | if (ssh_remove_identity(ac, public)) |
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85 | fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment); |
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86 | else |
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87 | fprintf(stderr, "Could not remove identity: %s\n", filename); |
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88 | key_free(public); |
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89 | xfree(comment); |
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90 | } |
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91 | |
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92 | /* Send a request to remove all identities. */ |
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93 | static void |
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94 | delete_all(AuthenticationConnection *ac) |
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95 | { |
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96 | int success = 1; |
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97 | |
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98 | if (!ssh_remove_all_identities(ac, 1)) |
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99 | success = 0; |
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100 | /* ignore error-code for ssh2 */ |
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101 | ssh_remove_all_identities(ac, 2); |
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102 | |
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103 | if (success) |
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104 | fprintf(stderr, "All identities removed.\n"); |
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105 | else |
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106 | fprintf(stderr, "Failed to remove all identities.\n"); |
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107 | } |
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108 | |
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109 | static void |
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110 | add_file(AuthenticationConnection *ac, const char *filename) |
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111 | { |
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112 | struct stat st; |
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113 | Key *private; |
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114 | char *comment = NULL; |
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115 | char msg[1024]; |
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116 | |
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117 | if (stat(filename, &st) < 0) { |
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118 | perror(filename); |
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119 | exit(1); |
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120 | } |
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121 | /* At first, try empty passphrase */ |
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122 | private = key_load_private(filename, "", &comment); |
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123 | if (comment == NULL) |
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124 | comment = xstrdup(filename); |
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125 | /* try last */ |
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126 | if (private == NULL && pass != NULL) |
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127 | private = key_load_private(filename, pass, NULL); |
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128 | if (private == NULL) { |
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129 | /* clear passphrase since it did not work */ |
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130 | clear_pass(); |
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131 | snprintf(msg, sizeof msg, "Enter passphrase for %.200s: ", |
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132 | comment); |
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133 | for (;;) { |
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134 | pass = read_passphrase(msg, RP_ALLOW_STDIN); |
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135 | if (strcmp(pass, "") == 0) { |
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136 | clear_pass(); |
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137 | xfree(comment); |
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138 | return; |
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139 | } |
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140 | private = key_load_private(filename, pass, &comment); |
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141 | if (private != NULL) |
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142 | break; |
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143 | clear_pass(); |
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144 | strlcpy(msg, "Bad passphrase, try again: ", sizeof msg); |
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145 | } |
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146 | } |
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147 | if (ssh_add_identity(ac, private, comment)) |
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148 | fprintf(stderr, "Identity added: %s (%s)\n", filename, comment); |
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149 | else |
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150 | fprintf(stderr, "Could not add identity: %s\n", filename); |
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151 | xfree(comment); |
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152 | key_free(private); |
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153 | } |
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154 | |
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155 | static void |
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156 | update_card(AuthenticationConnection *ac, int add, const char *id) |
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157 | { |
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158 | if (ssh_update_card(ac, add, id)) |
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159 | fprintf(stderr, "Card %s: %s\n", |
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160 | add ? "added" : "removed", id); |
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161 | else |
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162 | fprintf(stderr, "Could not %s card: %s\n", |
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163 | add ? "add" : "remove", id); |
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164 | } |
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165 | |
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166 | static void |
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167 | list_identities(AuthenticationConnection *ac, int do_fp) |
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168 | { |
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169 | Key *key; |
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170 | char *comment, *fp; |
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171 | int had_identities = 0; |
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172 | int version; |
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173 | |
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174 | for (version = 1; version <= 2; version++) { |
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175 | for (key = ssh_get_first_identity(ac, &comment, version); |
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176 | key != NULL; |
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177 | key = ssh_get_next_identity(ac, &comment, version)) { |
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178 | had_identities = 1; |
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179 | if (do_fp) { |
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180 | fp = key_fingerprint(key, SSH_FP_MD5, |
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181 | SSH_FP_HEX); |
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182 | printf("%d %s %s (%s)\n", |
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183 | key_size(key), fp, comment, key_type(key)); |
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184 | xfree(fp); |
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185 | } else { |
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186 | if (!key_write(key, stdout)) |
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187 | fprintf(stderr, "key_write failed"); |
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188 | fprintf(stdout, " %s\n", comment); |
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189 | } |
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190 | key_free(key); |
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191 | xfree(comment); |
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192 | } |
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193 | } |
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194 | if (!had_identities) |
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195 | printf("The agent has no identities.\n"); |
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196 | } |
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197 | |
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198 | static void |
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199 | usage(void) |
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200 | { |
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201 | fprintf(stderr, "Usage: %s [options]\n", __progname); |
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202 | fprintf(stderr, "Options:\n"); |
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203 | fprintf(stderr, " -l List fingerprints of all identities.\n"); |
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204 | fprintf(stderr, " -L List public key parameters of all identities.\n"); |
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205 | fprintf(stderr, " -d Delete identity.\n"); |
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206 | fprintf(stderr, " -D Delete all identities.\n"); |
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207 | #ifdef SMARTCARD |
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208 | fprintf(stderr, " -s reader Add key in smartcard reader.\n"); |
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209 | fprintf(stderr, " -e reader Remove key in smartcard reader.\n"); |
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210 | #endif |
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211 | } |
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212 | |
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213 | int |
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214 | main(int argc, char **argv) |
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215 | { |
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216 | extern char *optarg; |
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217 | extern int optind; |
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218 | AuthenticationConnection *ac = NULL; |
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219 | struct passwd *pw; |
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220 | char buf[1024]; |
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221 | char *sc_reader_id = NULL; |
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222 | int i, ch, deleting = 0; |
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223 | |
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224 | __progname = get_progname(argv[0]); |
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225 | init_rng(); |
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226 | seed_rng(); |
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227 | |
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228 | SSLeay_add_all_algorithms(); |
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229 | |
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230 | /* At first, get a connection to the authentication agent. */ |
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231 | ac = ssh_get_authentication_connection(); |
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232 | if (ac == NULL) { |
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233 | fprintf(stderr, "Could not open a connection to your authentication agent.\n"); |
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234 | exit(1); |
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235 | } |
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236 | while ((ch = getopt(argc, argv, "lLdDe:s:")) != -1) { |
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237 | switch (ch) { |
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238 | case 'l': |
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239 | case 'L': |
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240 | list_identities(ac, ch == 'l' ? 1 : 0); |
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241 | goto done; |
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242 | break; |
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243 | case 'd': |
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244 | deleting = 1; |
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245 | break; |
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246 | case 'D': |
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247 | delete_all(ac); |
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248 | goto done; |
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249 | break; |
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250 | case 's': |
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251 | sc_reader_id = optarg; |
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252 | break; |
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253 | case 'e': |
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254 | deleting = 1; |
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255 | sc_reader_id = optarg; |
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256 | break; |
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257 | default: |
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258 | usage(); |
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259 | exit(1); |
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260 | break; |
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261 | } |
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262 | } |
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263 | argc -= optind; |
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264 | argv += optind; |
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265 | if (sc_reader_id != NULL) { |
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266 | update_card(ac, !deleting, sc_reader_id); |
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267 | goto done; |
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268 | } |
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269 | if (argc == 0) { |
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270 | pw = getpwuid(getuid()); |
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271 | if (!pw) { |
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272 | fprintf(stderr, "No user found with uid %u\n", |
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273 | (u_int)getuid()); |
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274 | ssh_close_authentication_connection(ac); |
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275 | exit(1); |
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276 | } |
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277 | snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir, _PATH_SSH_CLIENT_IDENTITY); |
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278 | if (deleting) |
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279 | delete_file(ac, buf); |
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280 | else |
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281 | add_file(ac, buf); |
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282 | } else { |
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283 | for (i = 0; i < argc; i++) { |
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284 | if (deleting) |
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285 | delete_file(ac, argv[i]); |
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286 | else |
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287 | add_file(ac, argv[i]); |
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288 | } |
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289 | } |
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290 | clear_pass(); |
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291 | |
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292 | done: |
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293 | ssh_close_authentication_connection(ac); |
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294 | exit(0); |
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295 | } |
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