Mercurial > hg
annotate mcabber/mcabber/pgp.c @ 2265:b79a34e21076
do_say(): Do not display password value
author | Egor Kovetskiy <e.kovetskiy@gmail.com> |
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date | Wed, 04 May 2016 11:38:19 +0600 |
parents | a34c8b41e0b5 |
children | f5402d705f67 |
rev | line source |
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1 /* |
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2 * pgp.c -- PGP utility functions |
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3 * |
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4 * Copyright (C) 2006-2015 Mikael Berthe <mikael@lilotux.net> |
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5 * Some parts inspired by centericq (impgp.cc) |
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6 * |
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7 * This program is free software; you can redistribute it and/or modify |
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8 * it under the terms of the GNU General Public License as published by |
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9 * the Free Software Foundation; either version 2 of the License, or (at |
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10 * your option) any later version. |
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11 * |
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12 * This program is distributed in the hope that it will be useful, but |
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 * General Public License for more details. |
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16 * |
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17 * You should have received a copy of the GNU General Public License |
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18 * along with this program; if not, write to the Free Software |
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19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
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20 * USA |
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21 */ |
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22 |
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23 #include <config.h> |
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24 |
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25 #ifdef HAVE_GPGME |
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26 |
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27 #include <stdlib.h> |
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28 #include <string.h> |
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29 #include <unistd.h> |
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30 #include <locale.h> |
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31 #include <sys/mman.h> |
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32 #include <glib.h> |
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33 |
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34 #include "pgp.h" |
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35 #include "settings.h" |
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36 #include "utils.h" |
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37 #include "logprint.h" |
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38 |
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39 #define MIN_GPGME_VERSION "1.1.0" |
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40 |
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41 static struct gpg_struct |
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42 { |
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43 int enabled; |
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44 int version1; |
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45 char *private_key; |
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46 char *passphrase; |
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47 } gpg; |
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48 |
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49 |
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50 // gpg_init(priv_key, passphrase) |
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51 // Initialize the GPG sub-systems. This function must be invoked early. |
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52 // Note: priv_key & passphrase are optional, they can be set later. |
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53 // This function returns 0 if gpgme is available and initialized; |
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54 // if not it returns the gpgme error code. |
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55 int gpg_init(const char *priv_key, const char *passphrase) |
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56 { |
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57 gpgme_error_t err; |
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58 |
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59 gpgme_ctx_t ctx; |
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60 gpgme_engine_info_t info; |
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61 const char *gpg_path, *gpg_home; |
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62 |
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63 // Check for version and OpenPGP protocol support. |
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64 if (!gpgme_check_version(MIN_GPGME_VERSION)) { |
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65 scr_LogPrint(LPRINT_LOGNORM, |
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66 "GPGME initialization error: Bad library version"); |
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67 return -1; |
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68 } |
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69 |
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70 err = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP); |
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71 if (err) { |
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72 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8, |
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73 "GPGME initialization error: %s", gpgme_strerror(err)); |
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74 return err; |
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75 } |
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76 |
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77 // Set the locale information. |
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78 gpgme_set_locale(NULL, LC_CTYPE, setlocale(LC_CTYPE, NULL)); |
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79 gpgme_set_locale(NULL, LC_MESSAGES, setlocale(LC_MESSAGES, NULL)); |
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80 |
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81 // The path to the gpg binary can be specified in order to force |
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82 // version 1, for example. |
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83 gpg_path = settings_opt_get("gpg_path"); |
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84 gpg_home = settings_opt_get("gpg_home"); |
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85 if (gpg_path || gpg_home) { |
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86 char *xp_gpg_home = expand_filename(gpg_home); |
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87 err = gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP, gpg_path, xp_gpg_home); |
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88 g_free(xp_gpg_home); |
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89 if (err) return -1; |
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90 } |
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91 |
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92 // Store private data. |
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93 gpg_set_private_key(priv_key); |
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94 gpg_set_passphrase(passphrase); |
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95 |
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96 err = gpgme_new(&ctx); |
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97 if (err) return -1; |
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98 |
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99 // Check OpenPGP engine version; with version 2+ the agent is mandatory |
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100 // and we do not manage the passphrase. |
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101 gpgme_set_protocol(ctx, GPGME_PROTOCOL_OpenPGP); |
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102 if (err) return -1; |
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103 |
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104 err = gpgme_get_engine_info(&info); |
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105 if (!err) { |
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106 while (info && info->protocol != gpgme_get_protocol(ctx)) |
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107 info = info->next; |
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108 |
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109 if (info && info->version) { |
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110 if (!strncmp(info->version, "1.", 2)) |
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111 gpg.version1 = TRUE; |
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112 scr_log_print(LPRINT_DEBUG, "GPGME: Engine version is '%s'.", |
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113 info->version); |
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114 } |
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115 } |
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116 |
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118 gpg.enabled = 1; |
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119 return 0; |
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120 } |
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121 |
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122 // gpg_is_version1() |
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123 // Return TRUE if the GnuPG OpenPGP engine version is 1.x |
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124 int gpg_is_version1(void) |
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125 { |
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126 return gpg.version1; |
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127 } |
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128 |
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129 // gpg_terminate() |
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130 // Destroy data and free memory. |
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131 void gpg_terminate(void) |
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132 { |
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133 gpg.enabled = 0; |
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134 gpg_set_passphrase(NULL); |
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135 gpg_set_private_key(NULL); |
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136 } |
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137 |
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138 // gpg_set_passphrase(passphrase) |
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139 // Set the current passphrase (use NULL to erase it). |
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140 void gpg_set_passphrase(const char *passphrase) |
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141 { |
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142 // Remove current passphrase |
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143 if (gpg.passphrase) { |
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144 ssize_t len = strlen(gpg.passphrase); |
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145 memset(gpg.passphrase, 0, len); |
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146 munlock(gpg.passphrase, len); |
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147 g_free(gpg.passphrase); |
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148 } |
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149 if (passphrase) { |
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150 gpg.passphrase = g_strdup(passphrase); |
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151 mlock(gpg.passphrase, strlen(gpg.passphrase)); |
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152 } else { |
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153 gpg.passphrase = NULL; |
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154 } |
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155 } |
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156 |
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157 // gpg_set_private_key(keyid) |
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158 // Set the current private key id (use NULL to unset it). |
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159 void gpg_set_private_key(const char *priv_keyid) |
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160 { |
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161 g_free(gpg.private_key); |
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162 if (priv_keyid) |
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163 gpg.private_key = g_strdup(priv_keyid); |
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164 else |
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165 gpg.private_key = NULL; |
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166 } |
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167 |
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168 // gpg_get_private_key_id() |
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169 // Return the current private key id (static string). |
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170 const char *gpg_get_private_key_id(void) |
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171 { |
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172 return gpg.private_key; |
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173 } |
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174 |
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175 // strip_header_footer(data) |
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176 // Remove PGP header & footer from data. |
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177 // Return a new string, or NULL. |
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178 // The string must be freed by the caller with g_free() when no longer needed. |
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179 static char *strip_header_footer(const char *data) |
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180 { |
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181 char *p, *q; |
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182 |
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183 if (!data) |
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184 return NULL; |
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185 |
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186 // p: beginning of real data |
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187 // q: end of real data |
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188 |
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189 // Strip header (to the first empty line) |
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190 p = strstr(data, "\n\n"); |
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191 if (!p) |
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192 return g_strdup(data); |
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193 |
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194 // Strip footer |
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195 // We want to remove the last lines, until the line beginning with a '-' |
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196 p += 2; |
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197 for (q = p ; *q; q++) ; |
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198 // (q is at the end of data now) |
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199 for (q--; q > p && (*q != '\n' || *(q+1) != '-'); q--) ; |
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200 |
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201 if (q <= p) |
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202 return NULL; // Shouldn't happen... |
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203 |
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204 return g_strndup(p, q-p); |
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205 } |
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206 |
1598 | 207 // GCC ignores casts to void, thus we need to hack around that |
208 static inline void ignore(void*x) {} | |
209 | |
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210 // passphrase_cb() |
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211 // GPGME passphrase callback function. |
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212 static gpgme_error_t passphrase_cb(void *hook, const char *uid_hint, |
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213 const char *passphrase_info, int prev_was_bad, int fd) |
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214 { |
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215 ssize_t len; |
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216 |
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217 // Abort if we do not have the password. |
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218 if (!gpg.passphrase) { |
1598 | 219 ignore((void*)write(fd, "\n", 1)); // We have an error anyway, thus it does |
220 // not matter if we fail again. | |
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221 return gpg_error(GPG_ERR_CANCELED); |
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222 } |
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223 |
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224 // Write the passphrase to the file descriptor. |
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225 len = strlen(gpg.passphrase); |
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226 if (write(fd, gpg.passphrase, len) != len) |
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227 return gpg_error(GPG_ERR_CANCELED); |
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228 if (write(fd, "\n", 1) != 1) |
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229 return gpg_error(GPG_ERR_CANCELED); |
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230 |
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231 return 0; // Success |
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232 } |
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233 |
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234 // gpg_verify(gpg_data, text, *sigsum) |
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235 // Verify that gpg_data is a correct signature for text. |
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236 // Return the key id (or fingerprint), and set *sigsum to |
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237 // the gpgme signature summary value. |
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238 // The returned string must be freed with g_free() after use. |
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239 char *gpg_verify(const char *gpg_data, const char *text, |
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240 gpgme_sigsum_t *sigsum) |
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241 { |
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242 gpgme_ctx_t ctx; |
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243 gpgme_data_t data_sign, data_text; |
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244 char *data; |
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245 char *verified_key = NULL; |
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246 gpgme_key_t key; |
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247 gpgme_error_t err; |
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248 const char prefix[] = "-----BEGIN PGP SIGNATURE-----\n\n"; |
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249 const char suffix[] = "\n-----END PGP SIGNATURE-----\n"; |
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250 |
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251 // Reset the summary. |
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252 *sigsum = 0; |
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253 |
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254 if (!gpg.enabled) |
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255 return NULL; |
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256 |
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257 err = gpgme_new(&ctx); |
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258 if (err) { |
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259 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8, |
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260 "GPGME error: %s", gpgme_strerror(err)); |
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261 return NULL; |
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262 } |
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263 |
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264 gpgme_set_protocol(ctx, GPGME_PROTOCOL_OpenPGP); |
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265 |
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266 // Surround the given data with the prefix & suffix |
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267 data = g_new(char, sizeof(prefix) + sizeof(suffix) + strlen(gpg_data)); |
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268 strcpy(data, prefix); |
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269 strcat(data, gpg_data); |
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270 strcat(data, suffix); |
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271 |
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272 err = gpgme_data_new_from_mem(&data_sign, data, strlen(data), 0); |
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273 if (!err) { |
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274 err = gpgme_data_new_from_mem(&data_text, text, strlen(text), 0); |
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275 if (!err) { |
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276 err = gpgme_op_verify(ctx, data_sign, data_text, 0); |
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277 if (!err) { |
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278 gpgme_verify_result_t vr = gpgme_op_verify_result(ctx); |
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279 if (vr && vr->signatures) { |
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280 gpgme_signature_t s = NULL; |
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281 // check all signatures and stop if the first could be verified |
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282 for (s = vr->signatures; s && !verified_key; s = s->next) { |
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283 // Found the fingerprint. Let's try to get the key id. |
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284 if (NULL != s->fpr) { |
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285 if (!gpgme_get_key(ctx, s->fpr, &key, 0)) { |
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286 if (key) { |
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287 verified_key = g_strdup(key->subkeys->keyid); |
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288 gpgme_key_release(key); |
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289 } |
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290 } |
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291 } |
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292 *sigsum = s->summary; |
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293 // For some reason summary could be 0 when status is 0 too, |
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294 // which means the signature is valid... |
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295 if ((!*sigsum) && (!s->status)) |
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296 *sigsum = GPGME_SIGSUM_GREEN; |
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297 } |
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298 } |
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299 } |
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300 gpgme_data_release(data_text); |
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301 } |
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302 gpgme_data_release(data_sign); |
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303 } |
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304 if (err) |
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305 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8, |
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306 "GPGME verification error: %s", gpgme_strerror(err)); |
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307 gpgme_release(ctx); |
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308 g_free(data); |
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309 return verified_key; |
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310 } |
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311 |
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312 // gpg_sign(gpg_data) |
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313 // Return a signature of gpg_data (or NULL). |
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314 // The returned string must be freed with g_free() after use. |
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315 char *gpg_sign(const char *gpg_data) |
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316 { |
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317 gpgme_ctx_t ctx; |
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318 gpgme_data_t in, out; |
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319 char *signed_data = NULL; |
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320 size_t nread; |
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321 gpgme_key_t key; |
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322 gpgme_error_t err; |
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323 |
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324 if (!gpg.enabled || !gpg.private_key) |
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325 return NULL; |
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326 |
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327 err = gpgme_new(&ctx); |
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328 if (err) { |
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329 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8, |
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330 "GPGME error: %s", gpgme_strerror(err)); |
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331 return NULL; |
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332 } |
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333 |
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334 gpgme_set_protocol(ctx, GPGME_PROTOCOL_OpenPGP); |
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335 gpgme_set_textmode(ctx, 0); |
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336 gpgme_set_armor(ctx, 1); |
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337 |
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338 if (gpg.version1) { |
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339 // GPG_AGENT_INFO isn't used by GnuPG version 2+ |
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340 char *p = getenv("GPG_AGENT_INFO"); |
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341 if (!(p && strchr(p, ':'))) |
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342 gpgme_set_passphrase_cb(ctx, passphrase_cb, 0); |
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343 } |
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344 |
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345 err = gpgme_get_key(ctx, gpg.private_key, &key, 1); |
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PGP: Improve checks for missing keys
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diff
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346 if (err || !key) { |
1049
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347 scr_LogPrint(LPRINT_LOGNORM, "GPGME error: private key not found"); |
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348 gpgme_release(ctx); |
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349 return NULL; |
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350 } |
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351 |
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352 gpgme_signers_clear(ctx); |
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353 gpgme_signers_add(ctx, key); |
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354 gpgme_key_release(key); |
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355 err = gpgme_data_new_from_mem(&in, gpg_data, strlen(gpg_data), 0); |
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|
356 if (!err) { |
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357 err = gpgme_data_new(&out); |
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|
358 if (!err) { |
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359 err = gpgme_op_sign(ctx, in, out, GPGME_SIG_MODE_DETACH); |
2202
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diff
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360 if (err) { |
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361 gpgme_data_release(out); |
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362 } else { |
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363 signed_data = gpgme_data_release_and_get_mem(out, &nread); |
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|
364 if (signed_data) { |
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365 // We need to add a trailing NULL |
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366 char *dd = g_strndup(signed_data, nread); |
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|
367 free(signed_data); |
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|
368 signed_data = strip_header_footer(dd); |
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|
369 g_free(dd); |
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|
370 } |
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|
371 } |
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|
372 } |
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|
373 gpgme_data_release(in); |
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374 } |
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375 if (err && err != GPG_ERR_CANCELED) |
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376 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8, |
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377 "GPGME signature error: %s", gpgme_strerror(err)); |
1041
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378 gpgme_release(ctx); |
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379 return signed_data; |
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380 } |
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381 |
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382 // gpg_decrypt(gpg_data) |
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383 // Return decrypted gpg_data (or NULL). |
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384 // The returned string must be freed with g_free() after use. |
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385 char *gpg_decrypt(const char *gpg_data) |
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|
386 { |
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|
387 gpgme_ctx_t ctx; |
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388 gpgme_data_t in, out; |
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389 char *data; |
1041
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390 char *decrypted_data = NULL; |
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|
391 size_t nread; |
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392 gpgme_error_t err; |
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393 const char prefix[] = "-----BEGIN PGP MESSAGE-----\n\n"; |
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394 const char suffix[] = "\n-----END PGP MESSAGE-----\n"; |
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395 |
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396 if (!gpg.enabled) |
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397 return NULL; |
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398 |
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399 err = gpgme_new(&ctx); |
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400 if (err) { |
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401 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8, |
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402 "GPGME error: %s", gpgme_strerror(err)); |
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403 return NULL; |
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404 } |
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|
405 |
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406 gpgme_set_protocol(ctx, GPGME_PROTOCOL_OpenPGP); |
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407 |
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408 if (gpg.version1) { |
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409 // GPG_AGENT_INFO isn't used by GnuPG version 2+ |
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410 char *p = getenv("GPG_AGENT_INFO"); |
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411 if (!(p && strchr(p, ':'))) |
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412 gpgme_set_passphrase_cb(ctx, passphrase_cb, 0); |
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413 } |
1041
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414 |
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415 // Surround the given data with the prefix & suffix |
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416 data = g_new(char, sizeof(prefix) + sizeof(suffix) + strlen(gpg_data)); |
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417 strcpy(data, prefix); |
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418 strcat(data, gpg_data); |
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419 strcat(data, suffix); |
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|
420 |
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421 err = gpgme_data_new_from_mem(&in, data, strlen(data), 0); |
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|
422 if (!err) { |
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423 err = gpgme_data_new(&out); |
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|
424 if (!err) { |
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|
425 err = gpgme_op_decrypt(ctx, in, out); |
2202
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426 if (err) { |
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427 gpgme_data_release(out); |
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428 } else { |
1041
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429 decrypted_data = gpgme_data_release_and_get_mem(out, &nread); |
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|
430 if (decrypted_data) { |
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|
431 // We need to add a trailing NULL |
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432 char *dd = g_strndup(decrypted_data, nread); |
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|
433 free(decrypted_data); |
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|
434 decrypted_data = dd; |
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|
435 } |
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|
436 } |
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|
437 } |
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|
438 gpgme_data_release(in); |
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|
439 } |
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|
440 if (err && err != GPG_ERR_CANCELED) |
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|
441 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8, |
1047
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PGP: Better error messages
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1041
diff
changeset
|
442 "GPGME decryption error: %s", gpgme_strerror(err)); |
1041
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|
443 gpgme_release(ctx); |
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|
444 g_free(data); |
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|
445 return decrypted_data; |
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Introduce PGP utility functions
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|
446 } |
d4b97a2423eb
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|
447 |
2187
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PGP: Change gpg_encrypt() so that several encryption keys can be used
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1811
diff
changeset
|
448 // gpg_encrypt(gpg_data, keyids[], n) |
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PGP: Change gpg_encrypt() so that several encryption keys can be used
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diff
changeset
|
449 // Return encrypted gpg_data with the n keys from the keyids array (or NULL). |
1041
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|
450 // The returned string must be freed with g_free() after use. |
2187
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PGP: Change gpg_encrypt() so that several encryption keys can be used
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451 char *gpg_encrypt(const char *gpg_data, const char *keyids[], size_t nkeys) |
1041
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|
452 { |
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|
453 gpgme_ctx_t ctx; |
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|
454 gpgme_data_t in, out; |
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|
455 char *encrypted_data = NULL, *edata; |
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|
456 size_t nread; |
2187
e3b66c8ead4f
PGP: Change gpg_encrypt() so that several encryption keys can be used
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diff
changeset
|
457 gpgme_key_t *keys; |
1041
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458 gpgme_error_t err; |
2187
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PGP: Change gpg_encrypt() so that several encryption keys can be used
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diff
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|
459 unsigned i; |
1041
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|
460 |
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|
461 if (!gpg.enabled) |
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|
462 return NULL; |
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|
463 |
2187
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diff
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|
464 if (!keyids || !nkeys) { |
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|
465 return NULL; |
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|
466 } |
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PGP: Change gpg_encrypt() so that several encryption keys can be used
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1811
diff
changeset
|
467 |
1041
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|
468 err = gpgme_new(&ctx); |
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diff
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|
469 if (err) { |
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|
470 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8, |
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diff
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|
471 "GPGME error: %s", gpgme_strerror(err)); |
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diff
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|
472 return NULL; |
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diff
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|
473 } |
d4b97a2423eb
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diff
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|
474 |
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|
475 gpgme_set_protocol(ctx, GPGME_PROTOCOL_OpenPGP); |
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diff
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|
476 gpgme_set_textmode(ctx, 0); |
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diff
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|
477 gpgme_set_armor(ctx, 1); |
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|
478 |
2187
e3b66c8ead4f
PGP: Change gpg_encrypt() so that several encryption keys can be used
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diff
changeset
|
479 keys = g_new0(gpgme_key_t, 1+nkeys); |
2195
40ddaebeb81e
PGP: Add a memory allocation check and compilation directives
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2188
diff
changeset
|
480 if (!keys) { |
40ddaebeb81e
PGP: Add a memory allocation check and compilation directives
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2188
diff
changeset
|
481 gpgme_release(ctx); |
40ddaebeb81e
PGP: Add a memory allocation check and compilation directives
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2188
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changeset
|
482 return NULL; |
40ddaebeb81e
PGP: Add a memory allocation check and compilation directives
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2188
diff
changeset
|
483 } |
2187
e3b66c8ead4f
PGP: Change gpg_encrypt() so that several encryption keys can be used
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1811
diff
changeset
|
484 |
e3b66c8ead4f
PGP: Change gpg_encrypt() so that several encryption keys can be used
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1811
diff
changeset
|
485 for (i = 0; i < nkeys; i++) { |
e3b66c8ead4f
PGP: Change gpg_encrypt() so that several encryption keys can be used
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parents:
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diff
changeset
|
486 err = gpgme_get_key(ctx, keyids[i], &keys[i], 0); |
e3b66c8ead4f
PGP: Change gpg_encrypt() so that several encryption keys can be used
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diff
changeset
|
487 if (err || !keys[i]) { |
e3b66c8ead4f
PGP: Change gpg_encrypt() so that several encryption keys can be used
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parents:
1811
diff
changeset
|
488 scr_LogPrint(LPRINT_LOGNORM, "GPGME encryption error: cannot use key %s", |
e3b66c8ead4f
PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
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1811
diff
changeset
|
489 keyids[i]); |
e3b66c8ead4f
PGP: Change gpg_encrypt() so that several encryption keys can be used
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1811
diff
changeset
|
490 // We need to have err not null to ensure we won't try to encrypt |
e3b66c8ead4f
PGP: Change gpg_encrypt() so that several encryption keys can be used
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parents:
1811
diff
changeset
|
491 // without this key. |
e3b66c8ead4f
PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents:
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diff
changeset
|
492 if (!err) err = GPG_ERR_UNKNOWN_ERRNO; |
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493 break; |
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494 } |
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495 } |
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496 |
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497 if (!err) { |
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498 err = gpgme_data_new_from_mem(&in, gpg_data, strlen(gpg_data), 0); |
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499 if (!err) { |
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500 err = gpgme_data_new(&out); |
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501 if (!err) { |
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502 err = gpgme_op_encrypt(ctx, keys, GPGME_ENCRYPT_ALWAYS_TRUST, in, out); |
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503 if (err) { |
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504 gpgme_data_release(out); |
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505 } else { |
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506 encrypted_data = gpgme_data_release_and_get_mem(out, &nread); |
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507 if (encrypted_data) { |
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508 // We need to add a trailing NULL |
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509 char *dd = g_strndup(encrypted_data, nread); |
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510 free(encrypted_data); |
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511 encrypted_data = dd; |
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512 } |
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513 } |
1041
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514 } |
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515 gpgme_data_release(in); |
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516 } |
2187
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517 |
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518 if (err && err != GPG_ERR_CANCELED) { |
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519 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8, |
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520 "GPGME encryption error: %s", gpgme_strerror(err)); |
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521 } |
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522 } |
2187
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523 |
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524 for (i = 0; keys[i]; i++) |
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525 gpgme_key_release(keys[i]); |
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526 g_free(keys); |
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527 gpgme_release(ctx); |
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528 edata = strip_header_footer(encrypted_data); |
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529 if (encrypted_data) |
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530 free(encrypted_data); |
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531 return edata; |
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532 } |
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533 |
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534 // gpg_test_passphrase() |
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535 // Test the current gpg.passphrase with gpg.private_key. |
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536 // If the test doesn't succeed, the passphrase is cleared and a non-null |
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537 // value is returned. |
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538 int gpg_test_passphrase(void) |
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539 { |
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540 char *s; |
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541 |
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542 if (!gpg.private_key) |
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543 return -1; // No private key... |
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544 |
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545 s = gpg_sign("test"); |
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546 if (s) { |
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547 free(s); |
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548 return 0; // Ok, test successful |
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549 } |
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550 // The passphrase is wrong (if provided) |
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551 gpg_set_passphrase(NULL); |
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552 return -1; |
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553 } |
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554 |
1413 | 555 int gpg_enabled(void) |
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556 { |
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557 return gpg.enabled; |
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558 } |
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559 |
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560 #else /* not HAVE_GPGME */ |
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561 |
1413 | 562 int gpg_enabled(void) |
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563 { |
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564 return 0; |
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565 } |
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566 |
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567 #endif /* HAVE_GPGME */ |
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568 |
1811 | 569 /* vim: set et cindent cinoptions=>2\:2(0 ts=2 sw=2: For Vim users... */ |