Mercurial > hg
annotate mcabber/src/pgp.c @ 1617:9ca672ee884f
Fix previous commit :)
author | Mikael Berthe <mikael@lilotux.net> |
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date | Sun, 11 Oct 2009 22:47:12 +0200 |
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1 /* |
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2 * pgp.c -- PGP utility functions |
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3 * |
1599 | 4 * Copyright (C) 2006-2009 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 "logprint.h" |
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36 |
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37 #define MIN_GPGME_VERSION "1.0.0" |
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38 |
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39 static struct gpg_struct |
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40 { |
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41 int enabled; |
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42 char *private_key; |
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43 char *passphrase; |
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44 } gpg; |
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45 |
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46 |
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47 // gpg_init(priv_key, passphrase) |
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48 // Initialize the GPG sub-systems. This function must be invoked early. |
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49 // Note: priv_key & passphrase are optional, they can be set later. |
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50 // This function returns 0 if gpgme is available and initialized; |
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51 // if not it returns the gpgme error code. |
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52 int gpg_init(const char *priv_key, const char *passphrase) |
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53 { |
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54 gpgme_error_t err; |
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55 |
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56 // Check for version and OpenPGP protocol support. |
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57 if (!gpgme_check_version(MIN_GPGME_VERSION)) { |
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58 scr_LogPrint(LPRINT_LOGNORM, |
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59 "GPGME initialization error: Bad library version"); |
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60 return -1; |
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61 } |
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62 |
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63 err = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP); |
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64 if (err) { |
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65 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8, |
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66 "GPGME initialization error: %s", gpgme_strerror(err)); |
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67 return err; |
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68 } |
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69 |
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70 // Set the locale information. |
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71 gpgme_set_locale(NULL, LC_CTYPE, setlocale(LC_CTYPE, NULL)); |
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72 gpgme_set_locale(NULL, LC_MESSAGES, setlocale(LC_MESSAGES, NULL)); |
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73 |
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74 // Store private data. |
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75 gpg_set_private_key(priv_key); |
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76 gpg_set_passphrase(passphrase); |
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77 |
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78 gpg.enabled = 1; |
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79 return 0; |
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80 } |
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81 |
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82 // gpg_terminate() |
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83 // Destroy data and free memory. |
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84 void gpg_terminate(void) |
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85 { |
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86 gpg.enabled = 0; |
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87 gpg_set_passphrase(NULL); |
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88 gpg_set_private_key(NULL); |
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89 } |
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90 |
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91 // gpg_set_passphrase(passphrase) |
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92 // Set the current passphrase (use NULL to erase it). |
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93 void gpg_set_passphrase(const char *passphrase) |
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94 { |
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95 // Remove current passphrase |
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96 if (gpg.passphrase) { |
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97 ssize_t len = strlen(gpg.passphrase); |
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98 memset(gpg.passphrase, 0, len); |
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99 munlock(gpg.passphrase, len); |
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100 g_free(gpg.passphrase); |
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101 } |
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102 if (passphrase) { |
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103 gpg.passphrase = g_strdup(passphrase); |
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104 mlock(gpg.passphrase, strlen(gpg.passphrase)); |
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105 } else { |
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106 gpg.passphrase = NULL; |
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107 } |
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108 } |
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109 |
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110 // gpg_set_private_key(keyid) |
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111 // Set the current private key id (use NULL to unset it). |
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112 void gpg_set_private_key(const char *priv_keyid) |
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113 { |
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114 g_free(gpg.private_key); |
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115 if (priv_keyid) |
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116 gpg.private_key = g_strdup(priv_keyid); |
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117 else |
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118 gpg.private_key = NULL; |
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119 } |
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120 |
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121 // strip_header_footer(data) |
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122 // Remove PGP header & footer from data. |
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123 // Return a new string, or NULL. |
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124 // The string must be freed by the caller with g_free() when no longer needed. |
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125 static char *strip_header_footer(const char *data) |
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126 { |
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127 char *p, *q; |
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128 |
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129 if (!data) |
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130 return NULL; |
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131 |
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132 // p: beginning of real data |
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133 // q: end of real data |
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134 |
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135 // Strip header (to the first empty line) |
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136 p = strstr(data, "\n\n"); |
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137 if (!p) |
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138 return g_strdup(data); |
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139 |
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140 // Strip footer |
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141 // We want to remove the last lines, until the line beginning with a '-' |
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142 p += 2; |
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143 for (q = p ; *q; q++) ; |
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144 // (q is at the end of data now) |
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145 for (q--; q > p && (*q != '\n' || *(q+1) != '-'); q--) ; |
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146 |
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147 if (q <= p) |
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148 return NULL; // Shouldn't happen... |
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149 |
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150 return g_strndup(p, q-p); |
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151 } |
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152 |
1598 | 153 // GCC ignores casts to void, thus we need to hack around that |
154 static inline void ignore(void*x) {} | |
155 | |
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156 // passphrase_cb() |
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157 // GPGME passphrase callback function. |
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158 static gpgme_error_t passphrase_cb(void *hook, const char *uid_hint, |
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159 const char *passphrase_info, int prev_was_bad, int fd) |
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160 { |
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161 ssize_t len; |
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162 |
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163 // Abort if we do not have the password. |
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164 if (!gpg.passphrase) { |
1598 | 165 ignore((void*)write(fd, "\n", 1)); // We have an error anyway, thus it does |
166 // not matter if we fail again. | |
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167 return gpg_error(GPG_ERR_CANCELED); |
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168 } |
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169 |
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170 // Write the passphrase to the file descriptor. |
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171 len = strlen(gpg.passphrase); |
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172 if (write(fd, gpg.passphrase, len) != len) |
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173 return gpg_error(GPG_ERR_CANCELED); |
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174 if (write(fd, "\n", 1) != 1) |
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175 return gpg_error(GPG_ERR_CANCELED); |
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176 |
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177 return 0; // Success |
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178 } |
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179 |
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180 // gpg_verify(gpg_data, text, *sigsum) |
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181 // Verify that gpg_data is a correct signature for text. |
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182 // Return the key id (or fingerprint), and set *sigsum to |
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183 // the gpgme signature summary value. |
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184 // The returned string must be freed with g_free() after use. |
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185 char *gpg_verify(const char *gpg_data, const char *text, |
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186 gpgme_sigsum_t *sigsum) |
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187 { |
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188 gpgme_ctx_t ctx; |
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189 gpgme_data_t data_sign, data_text; |
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190 char *data; |
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191 char *verified_key = NULL; |
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192 gpgme_key_t key; |
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193 gpgme_error_t err; |
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194 const char prefix[] = "-----BEGIN PGP SIGNATURE-----\n\n"; |
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195 const char suffix[] = "\n-----END PGP SIGNATURE-----\n"; |
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196 |
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197 // Reset the summary. |
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198 *sigsum = 0; |
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199 |
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200 if (!gpg.enabled) |
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201 return NULL; |
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202 |
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203 err = gpgme_new(&ctx); |
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204 if (err) { |
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205 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8, |
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206 "GPGME error: %s", gpgme_strerror(err)); |
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207 return NULL; |
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208 } |
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209 |
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210 gpgme_set_protocol(ctx, GPGME_PROTOCOL_OpenPGP); |
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211 |
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212 // Surround the given data with the prefix & suffix |
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213 data = g_new(char, sizeof(prefix) + sizeof(suffix) + strlen(gpg_data)); |
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214 strcpy(data, prefix); |
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215 strcat(data, gpg_data); |
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216 strcat(data, suffix); |
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217 |
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218 err = gpgme_data_new_from_mem(&data_sign, data, strlen(data), 0); |
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219 if (!err) { |
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220 err = gpgme_data_new_from_mem(&data_text, text, strlen(text), 0); |
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221 if (!err) { |
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222 err = gpgme_op_verify(ctx, data_sign, data_text, 0); |
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223 if (!err) { |
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224 gpgme_verify_result_t vr = gpgme_op_verify_result(ctx); |
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225 if (vr && vr->signatures) { |
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226 char *r = vr->signatures->fpr; |
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227 // Found the fingerprint. Let's try to get the key id. |
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228 if (!gpgme_get_key(ctx, r, &key, 0) && key) { |
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229 r = key->subkeys->keyid; |
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230 gpgme_key_release(key); |
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231 } |
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232 // r is a static variable, let's copy it. |
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233 verified_key = g_strdup(r); |
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234 *sigsum = vr->signatures->summary; |
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235 // For some reason summary could be 0 when status is 0 too, |
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236 // which means the signature is valid... |
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237 if (!*sigsum && !vr->signatures->status) |
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238 *sigsum = GPGME_SIGSUM_GREEN; |
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239 } |
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240 } |
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241 gpgme_data_release(data_text); |
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242 } |
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243 gpgme_data_release(data_sign); |
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244 } |
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245 if (err) |
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246 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8, |
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247 "GPGME verification error: %s", gpgme_strerror(err)); |
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248 gpgme_release(ctx); |
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249 g_free(data); |
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250 return verified_key; |
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251 } |
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252 |
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253 // gpg_sign(gpg_data) |
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254 // Return a signature of gpg_data (or NULL). |
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255 // The returned string must be freed with g_free() after use. |
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256 char *gpg_sign(const char *gpg_data) |
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257 { |
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258 gpgme_ctx_t ctx; |
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259 gpgme_data_t in, out; |
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260 char *p; |
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261 char *signed_data = NULL; |
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262 size_t nread; |
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263 gpgme_key_t key; |
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264 gpgme_error_t err; |
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265 |
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266 if (!gpg.enabled || !gpg.private_key) |
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267 return NULL; |
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268 |
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269 err = gpgme_new(&ctx); |
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270 if (err) { |
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271 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8, |
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272 "GPGME error: %s", gpgme_strerror(err)); |
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273 return NULL; |
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274 } |
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275 |
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276 gpgme_set_protocol(ctx, GPGME_PROTOCOL_OpenPGP); |
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277 gpgme_set_textmode(ctx, 0); |
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278 gpgme_set_armor(ctx, 1); |
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279 |
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280 p = getenv("GPG_AGENT_INFO"); |
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281 if (!(p && strchr(p, ':'))) |
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282 gpgme_set_passphrase_cb(ctx, passphrase_cb, 0); |
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283 |
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284 err = gpgme_get_key(ctx, gpg.private_key, &key, 1); |
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285 if (err || !key) { |
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286 scr_LogPrint(LPRINT_LOGNORM, "GPGME error: private key not found"); |
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287 gpgme_release(ctx); |
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288 return NULL; |
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289 } |
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290 |
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291 gpgme_signers_clear(ctx); |
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292 gpgme_signers_add(ctx, key); |
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293 gpgme_key_release(key); |
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294 err = gpgme_data_new_from_mem(&in, gpg_data, strlen(gpg_data), 0); |
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295 if (!err) { |
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296 err = gpgme_data_new(&out); |
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297 if (!err) { |
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298 err = gpgme_op_sign(ctx, in, out, GPGME_SIG_MODE_DETACH); |
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299 if (!err) { |
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300 signed_data = gpgme_data_release_and_get_mem(out, &nread); |
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301 if (signed_data) { |
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302 // We need to add a trailing NULL |
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303 char *dd = g_strndup(signed_data, nread); |
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304 free(signed_data); |
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305 signed_data = strip_header_footer(dd); |
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306 g_free(dd); |
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307 } |
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308 } else { |
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309 gpgme_data_release(out); |
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310 } |
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311 } |
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312 gpgme_data_release(in); |
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313 } |
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314 if (err && err != GPG_ERR_CANCELED) |
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315 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8, |
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316 "GPGME signature error: %s", gpgme_strerror(err)); |
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317 gpgme_release(ctx); |
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318 return signed_data; |
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319 } |
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320 |
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321 // gpg_decrypt(gpg_data) |
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322 // Return decrypted gpg_data (or NULL). |
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323 // The returned string must be freed with g_free() after use. |
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324 char *gpg_decrypt(const char *gpg_data) |
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325 { |
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326 gpgme_ctx_t ctx; |
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327 gpgme_data_t in, out; |
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328 char *p, *data; |
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329 char *decrypted_data = NULL; |
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330 size_t nread; |
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331 gpgme_error_t err; |
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332 const char prefix[] = "-----BEGIN PGP MESSAGE-----\n\n"; |
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333 const char suffix[] = "\n-----END PGP MESSAGE-----\n"; |
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334 |
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335 if (!gpg.enabled) |
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336 return NULL; |
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337 |
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338 err = gpgme_new(&ctx); |
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339 if (err) { |
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340 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8, |
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341 "GPGME error: %s", gpgme_strerror(err)); |
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342 return NULL; |
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343 } |
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344 |
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345 gpgme_set_protocol(ctx, GPGME_PROTOCOL_OpenPGP); |
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346 |
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347 p = getenv("GPG_AGENT_INFO"); |
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348 if (!(p && strchr(p, ':'))) |
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349 gpgme_set_passphrase_cb(ctx, passphrase_cb, 0); |
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350 |
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351 // Surround the given data with the prefix & suffix |
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352 data = g_new(char, sizeof(prefix) + sizeof(suffix) + strlen(gpg_data)); |
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353 strcpy(data, prefix); |
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354 strcat(data, gpg_data); |
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355 strcat(data, suffix); |
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356 |
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357 err = gpgme_data_new_from_mem(&in, data, strlen(data), 0); |
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358 if (!err) { |
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359 err = gpgme_data_new(&out); |
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360 if (!err) { |
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361 err = gpgme_op_decrypt(ctx, in, out); |
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362 if (!err) { |
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363 decrypted_data = gpgme_data_release_and_get_mem(out, &nread); |
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364 if (decrypted_data) { |
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365 // We need to add a trailing NULL |
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366 char *dd = g_strndup(decrypted_data, nread); |
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367 free(decrypted_data); |
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368 decrypted_data = dd; |
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369 } |
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370 } else { |
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371 gpgme_data_release(out); |
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372 } |
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373 } |
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374 gpgme_data_release(in); |
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375 } |
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376 if (err && err != GPG_ERR_CANCELED) |
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377 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8, |
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378 "GPGME decryption error: %s", gpgme_strerror(err)); |
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379 gpgme_release(ctx); |
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380 g_free(data); |
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381 return decrypted_data; |
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382 } |
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383 |
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384 // gpg_encrypt(gpg_data, keyid) |
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385 // Return encrypted gpg_data with the key keyid (or NULL). |
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386 // The returned string must be freed with g_free() after use. |
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387 char *gpg_encrypt(const char *gpg_data, const char *keyid) |
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388 { |
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389 gpgme_ctx_t ctx; |
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390 gpgme_data_t in, out; |
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391 char *encrypted_data = NULL, *edata; |
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392 size_t nread; |
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393 gpgme_key_t key; |
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394 gpgme_error_t err; |
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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 gpgme_set_textmode(ctx, 0); |
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408 gpgme_set_armor(ctx, 1); |
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409 |
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410 err = gpgme_get_key(ctx, keyid, &key, 0); |
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411 if (!err && key) { |
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412 gpgme_key_t keys[] = { key, 0 }; |
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413 err = gpgme_data_new_from_mem(&in, gpg_data, strlen(gpg_data), 0); |
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414 if (!err) { |
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415 err = gpgme_data_new(&out); |
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416 if (!err) { |
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417 err = gpgme_op_encrypt(ctx, keys, GPGME_ENCRYPT_ALWAYS_TRUST, in, out); |
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418 if (!err) |
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419 encrypted_data = gpgme_data_release_and_get_mem(out, &nread); |
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420 else |
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421 gpgme_data_release(out); |
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422 } |
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423 gpgme_data_release(in); |
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424 } |
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425 gpgme_key_release(key); |
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426 } else { |
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427 scr_LogPrint(LPRINT_LOGNORM, "GPGME encryption error: key not found"); |
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428 err = 0; |
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429 } |
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430 if (err && err != GPG_ERR_CANCELED) |
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431 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8, |
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432 "GPGME encryption error: %s", gpgme_strerror(err)); |
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433 gpgme_release(ctx); |
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434 edata = strip_header_footer(encrypted_data); |
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435 if (encrypted_data) |
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436 free(encrypted_data); |
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437 return edata; |
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438 } |
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439 |
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440 // gpg_test_passphrase() |
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441 // Test the current gpg.passphrase with gpg.private_key. |
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442 // If the test doesn't succeed, the passphrase is cleared and a non-null |
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443 // value is returned. |
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444 int gpg_test_passphrase(void) |
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445 { |
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446 char *s; |
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447 |
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448 if (!gpg.private_key) |
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449 return -1; // No private key... |
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450 |
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451 s = gpg_sign("test"); |
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452 if (s) { |
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453 free(s); |
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454 return 0; // Ok, test successful |
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455 } |
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456 // The passphrase is wrong (if provided) |
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457 gpg_set_passphrase(NULL); |
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458 return -1; |
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459 } |
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460 |
1413 | 461 int gpg_enabled(void) |
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462 { |
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463 return gpg.enabled; |
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464 } |
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465 |
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466 #else /* not HAVE_GPGME */ |
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467 |
1413 | 468 int gpg_enabled(void) |
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469 { |
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470 return 0; |
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471 } |
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472 |
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473 #endif /* HAVE_GPGME */ |
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474 |
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475 /* vim: set expandtab cindent cinoptions=>2\:2(0: For Vim users... */ |