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annotate mcabber/mcabber/pgp.c @ 2221:3f9988ec21e0

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caps: Add a cast to remove a compilation warning
author Mikael Berthe <mikael@lilotux.net>
date Fri, 06 Nov 2015 19:46:48 +0100
parents 778280b01bcb
children 90c25a29fb35
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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 "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 int version1;
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43 char *private_key;
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44 char *passphrase;
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45 } gpg;
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46
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47
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48 // gpg_init(priv_key, passphrase)
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49 // Initialize the GPG sub-systems. This function must be invoked early.
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50 // Note: priv_key & passphrase are optional, they can be set later.
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51 // This function returns 0 if gpgme is available and initialized;
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52 // if not it returns the gpgme error code.
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53 int gpg_init(const char *priv_key, const char *passphrase)
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54 {
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55 gpgme_error_t err;
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56
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57 gpgme_ctx_t ctx;
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58 gpgme_engine_info_t info;
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59
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60 // Check for version and OpenPGP protocol support.
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61 if (!gpgme_check_version(MIN_GPGME_VERSION)) {
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62 scr_LogPrint(LPRINT_LOGNORM,
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63 "GPGME initialization error: Bad library version");
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64 return -1;
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65 }
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66
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67 err = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
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68 if (err) {
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69 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
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70 "GPGME initialization error: %s", gpgme_strerror(err));
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71 return err;
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72 }
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73
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74 // Set the locale information.
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75 gpgme_set_locale(NULL, LC_CTYPE, setlocale(LC_CTYPE, NULL));
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76 gpgme_set_locale(NULL, LC_MESSAGES, setlocale(LC_MESSAGES, NULL));
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77
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78 // Store private data.
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79 gpg_set_private_key(priv_key);
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80 gpg_set_passphrase(passphrase);
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81
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82 err = gpgme_new(&ctx);
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83 if (err) return -1;
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84
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85 // Check OpenPGP engine version; with version 2+ the agent is mandatory
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86 // and we do not manage the passphrase.
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87 gpgme_set_protocol(ctx, GPGME_PROTOCOL_OpenPGP);
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88 if (err) return -1;
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89
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90 err = gpgme_get_engine_info (&info);
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91 if (!err) {
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92 while (info && info->protocol != gpgme_get_protocol (ctx))
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93 info = info->next;
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94
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95 if (info && info->version) {
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96 if (!strncmp(info->version, "1.", 2))
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97 gpg.version1 = TRUE;
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98 scr_log_print(LPRINT_DEBUG, "GPGME: Engine version is '%s'.",
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99 info->version);
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100 }
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101 }
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102
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103 gpgme_release(ctx);
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104 gpg.enabled = 1;
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105 return 0;
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106 }
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107
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108 // gpg_is_version1()
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109 // Return TRUE if the GnuPG OpenPGP engine version is 1.x
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110 int gpg_is_version1(void)
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111 {
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112 return gpg.version1;
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113 }
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114
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115 // gpg_terminate()
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116 // Destroy data and free memory.
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117 void gpg_terminate(void)
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118 {
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119 gpg.enabled = 0;
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120 gpg_set_passphrase(NULL);
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121 gpg_set_private_key(NULL);
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122 }
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123
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124 // gpg_set_passphrase(passphrase)
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125 // Set the current passphrase (use NULL to erase it).
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126 void gpg_set_passphrase(const char *passphrase)
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127 {
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128 // Remove current passphrase
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129 if (gpg.passphrase) {
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130 ssize_t len = strlen(gpg.passphrase);
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131 memset(gpg.passphrase, 0, len);
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132 munlock(gpg.passphrase, len);
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133 g_free(gpg.passphrase);
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134 }
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135 if (passphrase) {
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136 gpg.passphrase = g_strdup(passphrase);
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137 mlock(gpg.passphrase, strlen(gpg.passphrase));
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138 } else {
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139 gpg.passphrase = NULL;
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140 }
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141 }
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142
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143 // gpg_set_private_key(keyid)
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144 // Set the current private key id (use NULL to unset it).
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145 void gpg_set_private_key(const char *priv_keyid)
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146 {
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147 g_free(gpg.private_key);
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148 if (priv_keyid)
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149 gpg.private_key = g_strdup(priv_keyid);
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150 else
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151 gpg.private_key = NULL;
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152 }
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153
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154 // gpg_get_private_key_id()
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155 // Return the current private key id (static string).
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156 const char *gpg_get_private_key_id(void)
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157 {
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158 return gpg.private_key;
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159 }
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160
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161 // strip_header_footer(data)
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162 // Remove PGP header & footer from data.
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163 // Return a new string, or NULL.
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164 // The string must be freed by the caller with g_free() when no longer needed.
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165 static char *strip_header_footer(const char *data)
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166 {
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167 char *p, *q;
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168
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169 if (!data)
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170 return NULL;
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171
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172 // p: beginning of real data
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173 // q: end of real data
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174
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175 // Strip header (to the first empty line)
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176 p = strstr(data, "\n\n");
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177 if (!p)
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178 return g_strdup(data);
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179
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180 // Strip footer
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181 // We want to remove the last lines, until the line beginning with a '-'
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182 p += 2;
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183 for (q = p ; *q; q++) ;
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184 // (q is at the end of data now)
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185 for (q--; q > p && (*q != '\n' || *(q+1) != '-'); q--) ;
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186
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187 if (q <= p)
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188 return NULL; // Shouldn't happen...
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189
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190 return g_strndup(p, q-p);
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191 }
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192
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193 // GCC ignores casts to void, thus we need to hack around that
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194 static inline void ignore(void*x) {}
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195
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196 // passphrase_cb()
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197 // GPGME passphrase callback function.
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198 static gpgme_error_t passphrase_cb(void *hook, const char *uid_hint,
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199 const char *passphrase_info, int prev_was_bad, int fd)
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200 {
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201 ssize_t len;
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202
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203 // Abort if we do not have the password.
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204 if (!gpg.passphrase) {
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205 ignore((void*)write(fd, "\n", 1)); // We have an error anyway, thus it does
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206 // not matter if we fail again.
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207 return gpg_error(GPG_ERR_CANCELED);
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208 }
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209
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210 // Write the passphrase to the file descriptor.
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211 len = strlen(gpg.passphrase);
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212 if (write(fd, gpg.passphrase, len) != len)
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213 return gpg_error(GPG_ERR_CANCELED);
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214 if (write(fd, "\n", 1) != 1)
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215 return gpg_error(GPG_ERR_CANCELED);
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216
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217 return 0; // Success
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218 }
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219
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220 // gpg_verify(gpg_data, text, *sigsum)
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221 // Verify that gpg_data is a correct signature for text.
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222 // Return the key id (or fingerprint), and set *sigsum to
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223 // the gpgme signature summary value.
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224 // The returned string must be freed with g_free() after use.
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225 char *gpg_verify(const char *gpg_data, const char *text,
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226 gpgme_sigsum_t *sigsum)
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227 {
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228 gpgme_ctx_t ctx;
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229 gpgme_data_t data_sign, data_text;
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230 char *data;
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231 char *verified_key = NULL;
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232 gpgme_key_t key;
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233 gpgme_error_t err;
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234 const char prefix[] = "-----BEGIN PGP SIGNATURE-----\n\n";
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235 const char suffix[] = "\n-----END PGP SIGNATURE-----\n";
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236
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237 // Reset the summary.
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238 *sigsum = 0;
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239
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240 if (!gpg.enabled)
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241 return NULL;
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242
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243 err = gpgme_new(&ctx);
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244 if (err) {
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245 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
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246 "GPGME error: %s", gpgme_strerror(err));
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247 return NULL;
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248 }
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249
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250 gpgme_set_protocol(ctx, GPGME_PROTOCOL_OpenPGP);
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251
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252 // Surround the given data with the prefix & suffix
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253 data = g_new(char, sizeof(prefix) + sizeof(suffix) + strlen(gpg_data));
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254 strcpy(data, prefix);
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255 strcat(data, gpg_data);
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256 strcat(data, suffix);
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257
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258 err = gpgme_data_new_from_mem(&data_sign, data, strlen(data), 0);
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259 if (!err) {
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260 err = gpgme_data_new_from_mem(&data_text, text, strlen(text), 0);
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261 if (!err) {
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262 err = gpgme_op_verify(ctx, data_sign, data_text, 0);
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263 if (!err) {
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264 gpgme_verify_result_t vr = gpgme_op_verify_result(ctx);
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265 if (vr && vr->signatures) {
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266 gpgme_signature_t s = NULL;
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267 // check all signatures and stop if the first could be verified
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268 for (s = vr->signatures; s && !verified_key; s = s->next) {
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269 // Found the fingerprint. Let's try to get the key id.
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270 if (NULL != s->fpr) {
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271 if (!gpgme_get_key(ctx, s->fpr, &key, 0)) {
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272 if (key) {
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273 verified_key = g_strdup(key->subkeys->keyid);
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274 gpgme_key_release(key);
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275 }
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276 }
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277 }
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278 *sigsum = s->summary;
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279 // For some reason summary could be 0 when status is 0 too,
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280 // which means the signature is valid...
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281 if ((!*sigsum) && (!s->status))
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282 *sigsum = GPGME_SIGSUM_GREEN;
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283 }
1041
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284 }
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285 }
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286 gpgme_data_release(data_text);
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287 }
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288 gpgme_data_release(data_sign);
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289 }
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290 if (err)
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parents:
diff changeset
291 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
1047
0dc104d51dce PGP: Better error messages
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parents: 1041
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292 "GPGME verification error: %s", gpgme_strerror(err));
1041
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parents:
diff changeset
293 gpgme_release(ctx);
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parents:
diff changeset
294 g_free(data);
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parents:
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295 return verified_key;
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parents:
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296 }
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parents:
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297
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parents:
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298 // gpg_sign(gpg_data)
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299 // Return a signature of gpg_data (or NULL).
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300 // The returned string must be freed with g_free() after use.
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parents:
diff changeset
301 char *gpg_sign(const char *gpg_data)
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parents:
diff changeset
302 {
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parents:
diff changeset
303 gpgme_ctx_t ctx;
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parents:
diff changeset
304 gpgme_data_t in, out;
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parents:
diff changeset
305 char *signed_data = NULL;
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parents:
diff changeset
306 size_t nread;
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parents:
diff changeset
307 gpgme_key_t key;
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parents:
diff changeset
308 gpgme_error_t err;
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parents:
diff changeset
309
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parents:
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310 if (!gpg.enabled || !gpg.private_key)
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diff changeset
311 return NULL;
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parents:
diff changeset
312
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diff changeset
313 err = gpgme_new(&ctx);
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parents:
diff changeset
314 if (err) {
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parents:
diff changeset
315 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
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parents:
diff changeset
316 "GPGME error: %s", gpgme_strerror(err));
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parents:
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317 return NULL;
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
318 }
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parents:
diff changeset
319
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320 gpgme_set_protocol(ctx, GPGME_PROTOCOL_OpenPGP);
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321 gpgme_set_textmode(ctx, 0);
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322 gpgme_set_armor(ctx, 1);
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323
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diff changeset
324 if (gpg.version1) {
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325 // GPG_AGENT_INFO isn't used by GnuPG version 2+
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diff changeset
326 char *p = getenv("GPG_AGENT_INFO");
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327 if (!(p && strchr(p, ':')))
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diff changeset
328 gpgme_set_passphrase_cb(ctx, passphrase_cb, 0);
8811fe9d6ef0 Improve support for GnuPG v2+
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parents: 2195
diff changeset
329 }
1041
d4b97a2423eb Introduce PGP utility functions
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330
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331 err = gpgme_get_key(ctx, gpg.private_key, &key, 1);
1105
265e1d873d3e PGP: Improve checks for missing keys
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parents: 1057
diff changeset
332 if (err || !key) {
1049
ad5de4d1ee56 PGP: Give a more useful error message when the private key isn't found
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parents: 1047
diff changeset
333 scr_LogPrint(LPRINT_LOGNORM, "GPGME error: private key not found");
ad5de4d1ee56 PGP: Give a more useful error message when the private key isn't found
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parents: 1047
diff changeset
334 gpgme_release(ctx);
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parents: 1047
diff changeset
335 return NULL;
1041
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parents:
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336 }
1049
ad5de4d1ee56 PGP: Give a more useful error message when the private key isn't found
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parents: 1047
diff changeset
337
ad5de4d1ee56 PGP: Give a more useful error message when the private key isn't found
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diff changeset
338 gpgme_signers_clear(ctx);
ad5de4d1ee56 PGP: Give a more useful error message when the private key isn't found
Mikael Berthe <mikael@lilotux.net>
parents: 1047
diff changeset
339 gpgme_signers_add(ctx, key);
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parents: 1047
diff changeset
340 gpgme_key_release(key);
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parents: 1047
diff changeset
341 err = gpgme_data_new_from_mem(&in, gpg_data, strlen(gpg_data), 0);
1041
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parents:
diff changeset
342 if (!err) {
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parents:
diff changeset
343 err = gpgme_data_new(&out);
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
344 if (!err) {
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parents:
diff changeset
345 err = gpgme_op_sign(ctx, in, out, GPGME_SIG_MODE_DETACH);
2202
ff18feb75a6d PGP: Add a trailing NULL after a message is PGP-encrypted
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parents: 2200
diff changeset
346 if (err) {
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diff changeset
347 gpgme_data_release(out);
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parents: 2200
diff changeset
348 } else {
1041
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
349 signed_data = gpgme_data_release_and_get_mem(out, &nread);
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
350 if (signed_data) {
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parents:
diff changeset
351 // We need to add a trailing NULL
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parents:
diff changeset
352 char *dd = g_strndup(signed_data, nread);
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
353 free(signed_data);
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parents:
diff changeset
354 signed_data = strip_header_footer(dd);
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
355 g_free(dd);
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
356 }
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
357 }
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
358 }
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
359 gpgme_data_release(in);
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
360 }
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parents:
diff changeset
361 if (err && err != GPG_ERR_CANCELED)
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
362 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
1047
0dc104d51dce PGP: Better error messages
Mikael Berthe <mikael@lilotux.net>
parents: 1041
diff changeset
363 "GPGME signature error: %s", gpgme_strerror(err));
1041
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
364 gpgme_release(ctx);
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
365 return signed_data;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
366 }
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
367
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
368 // gpg_decrypt(gpg_data)
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
369 // Return decrypted gpg_data (or NULL).
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parents:
diff changeset
370 // The returned string must be freed with g_free() after use.
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
371 char *gpg_decrypt(const char *gpg_data)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
372 {
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
373 gpgme_ctx_t ctx;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
374 gpgme_data_t in, out;
2196
8811fe9d6ef0 Improve support for GnuPG v2+
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parents: 2195
diff changeset
375 char *data;
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
376 char *decrypted_data = NULL;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
377 size_t nread;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
378 gpgme_error_t err;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
379 const char prefix[] = "-----BEGIN PGP MESSAGE-----\n\n";
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
380 const char suffix[] = "\n-----END PGP MESSAGE-----\n";
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
381
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
382 if (!gpg.enabled)
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
383 return NULL;
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
384
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
385 err = gpgme_new(&ctx);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
386 if (err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
387 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
388 "GPGME error: %s", gpgme_strerror(err));
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
389 return NULL;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
390 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
391
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
392 gpgme_set_protocol(ctx, GPGME_PROTOCOL_OpenPGP);
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
393
2196
8811fe9d6ef0 Improve support for GnuPG v2+
Mikael Berthe <mikael@lilotux.net>
parents: 2195
diff changeset
394 if (gpg.version1) {
8811fe9d6ef0 Improve support for GnuPG v2+
Mikael Berthe <mikael@lilotux.net>
parents: 2195
diff changeset
395 // GPG_AGENT_INFO isn't used by GnuPG version 2+
8811fe9d6ef0 Improve support for GnuPG v2+
Mikael Berthe <mikael@lilotux.net>
parents: 2195
diff changeset
396 char *p = getenv("GPG_AGENT_INFO");
8811fe9d6ef0 Improve support for GnuPG v2+
Mikael Berthe <mikael@lilotux.net>
parents: 2195
diff changeset
397 if (!(p && strchr(p, ':')))
8811fe9d6ef0 Improve support for GnuPG v2+
Mikael Berthe <mikael@lilotux.net>
parents: 2195
diff changeset
398 gpgme_set_passphrase_cb(ctx, passphrase_cb, 0);
8811fe9d6ef0 Improve support for GnuPG v2+
Mikael Berthe <mikael@lilotux.net>
parents: 2195
diff changeset
399 }
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
400
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
401 // Surround the given data with the prefix & suffix
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
402 data = g_new(char, sizeof(prefix) + sizeof(suffix) + strlen(gpg_data));
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
403 strcpy(data, prefix);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
404 strcat(data, gpg_data);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
405 strcat(data, suffix);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
406
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
407 err = gpgme_data_new_from_mem(&in, data, strlen(data), 0);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
408 if (!err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
409 err = gpgme_data_new(&out);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
410 if (!err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
411 err = gpgme_op_decrypt(ctx, in, out);
2202
ff18feb75a6d PGP: Add a trailing NULL after a message is PGP-encrypted
Mikael Berthe <mikael@lilotux.net>
parents: 2200
diff changeset
412 if (err) {
ff18feb75a6d PGP: Add a trailing NULL after a message is PGP-encrypted
Mikael Berthe <mikael@lilotux.net>
parents: 2200
diff changeset
413 gpgme_data_release(out);
ff18feb75a6d PGP: Add a trailing NULL after a message is PGP-encrypted
Mikael Berthe <mikael@lilotux.net>
parents: 2200
diff changeset
414 } else {
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
415 decrypted_data = gpgme_data_release_and_get_mem(out, &nread);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
416 if (decrypted_data) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
417 // We need to add a trailing NULL
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
418 char *dd = g_strndup(decrypted_data, nread);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
419 free(decrypted_data);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
420 decrypted_data = dd;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
421 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
422 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
423 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
424 gpgme_data_release(in);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
425 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
426 if (err && err != GPG_ERR_CANCELED)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
427 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
1047
0dc104d51dce PGP: Better error messages
Mikael Berthe <mikael@lilotux.net>
parents: 1041
diff changeset
428 "GPGME decryption error: %s", gpgme_strerror(err));
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
429 gpgme_release(ctx);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
430 g_free(data);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
431 return decrypted_data;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
432 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
433
2187
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
434 // gpg_encrypt(gpg_data, keyids[], n)
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
435 // Return encrypted gpg_data with the n keys from the keyids array (or NULL).
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
436 // The returned string must be freed with g_free() after use.
2187
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
437 char *gpg_encrypt(const char *gpg_data, const char *keyids[], size_t nkeys)
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
438 {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
439 gpgme_ctx_t ctx;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
440 gpgme_data_t in, out;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
441 char *encrypted_data = NULL, *edata;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
442 size_t nread;
2187
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
443 gpgme_key_t *keys;
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
444 gpgme_error_t err;
2187
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
445 unsigned i;
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
446
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
447 if (!gpg.enabled)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
448 return NULL;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
449
2187
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
450 if (!keyids || !nkeys) {
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
451 return NULL;
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
452 }
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
453
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
454 err = gpgme_new(&ctx);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
455 if (err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
456 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
457 "GPGME error: %s", gpgme_strerror(err));
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
458 return NULL;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
459 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
460
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
461 gpgme_set_protocol(ctx, GPGME_PROTOCOL_OpenPGP);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
462 gpgme_set_textmode(ctx, 0);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
463 gpgme_set_armor(ctx, 1);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
464
2187
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
465 keys = g_new0(gpgme_key_t, 1+nkeys);
2195
40ddaebeb81e PGP: Add a memory allocation check and compilation directives
Mikael Berthe <mikael@lilotux.net>
parents: 2188
diff changeset
466 if (!keys) {
40ddaebeb81e PGP: Add a memory allocation check and compilation directives
Mikael Berthe <mikael@lilotux.net>
parents: 2188
diff changeset
467 gpgme_release(ctx);
40ddaebeb81e PGP: Add a memory allocation check and compilation directives
Mikael Berthe <mikael@lilotux.net>
parents: 2188
diff changeset
468 return NULL;
40ddaebeb81e PGP: Add a memory allocation check and compilation directives
Mikael Berthe <mikael@lilotux.net>
parents: 2188
diff changeset
469 }
2187
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
470
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
471 for (i = 0; i < nkeys; i++) {
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
472 err = gpgme_get_key(ctx, keyids[i], &keys[i], 0);
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
473 if (err || !keys[i]) {
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
474 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>
parents: 1811
diff changeset
475 keyids[i]);
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
476 // 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
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
477 // without this key.
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
478 if (!err) err = GPG_ERR_UNKNOWN_ERRNO;
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
479 break;
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
480 }
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
481 }
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
482
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
483 if (!err) {
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
484 err = gpgme_data_new_from_mem(&in, gpg_data, strlen(gpg_data), 0);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
485 if (!err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
486 err = gpgme_data_new(&out);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
487 if (!err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
488 err = gpgme_op_encrypt(ctx, keys, GPGME_ENCRYPT_ALWAYS_TRUST, in, out);
2202
ff18feb75a6d PGP: Add a trailing NULL after a message is PGP-encrypted
Mikael Berthe <mikael@lilotux.net>
parents: 2200
diff changeset
489 if (err) {
ff18feb75a6d PGP: Add a trailing NULL after a message is PGP-encrypted
Mikael Berthe <mikael@lilotux.net>
parents: 2200
diff changeset
490 gpgme_data_release(out);
ff18feb75a6d PGP: Add a trailing NULL after a message is PGP-encrypted
Mikael Berthe <mikael@lilotux.net>
parents: 2200
diff changeset
491 } else {
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
492 encrypted_data = gpgme_data_release_and_get_mem(out, &nread);
2202
ff18feb75a6d PGP: Add a trailing NULL after a message is PGP-encrypted
Mikael Berthe <mikael@lilotux.net>
parents: 2200
diff changeset
493 if (encrypted_data) {
ff18feb75a6d PGP: Add a trailing NULL after a message is PGP-encrypted
Mikael Berthe <mikael@lilotux.net>
parents: 2200
diff changeset
494 // We need to add a trailing NULL
ff18feb75a6d PGP: Add a trailing NULL after a message is PGP-encrypted
Mikael Berthe <mikael@lilotux.net>
parents: 2200
diff changeset
495 char *dd = g_strndup(encrypted_data, nread);
ff18feb75a6d PGP: Add a trailing NULL after a message is PGP-encrypted
Mikael Berthe <mikael@lilotux.net>
parents: 2200
diff changeset
496 free(encrypted_data);
ff18feb75a6d PGP: Add a trailing NULL after a message is PGP-encrypted
Mikael Berthe <mikael@lilotux.net>
parents: 2200
diff changeset
497 encrypted_data = dd;
ff18feb75a6d PGP: Add a trailing NULL after a message is PGP-encrypted
Mikael Berthe <mikael@lilotux.net>
parents: 2200
diff changeset
498 }
ff18feb75a6d PGP: Add a trailing NULL after a message is PGP-encrypted
Mikael Berthe <mikael@lilotux.net>
parents: 2200
diff changeset
499 }
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
500 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
501 gpgme_data_release(in);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
502 }
2187
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
503
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
504 if (err && err != GPG_ERR_CANCELED) {
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
505 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
506 "GPGME encryption error: %s", gpgme_strerror(err));
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
507 }
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
508 }
2187
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
509
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
510 for (i = 0; keys[i]; i++)
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
511 gpgme_key_release(keys[i]);
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
512 g_free(keys);
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
513 gpgme_release(ctx);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
514 edata = strip_header_footer(encrypted_data);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
515 if (encrypted_data)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
516 free(encrypted_data);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
517 return edata;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
518 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
519
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
520 // gpg_test_passphrase()
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
521 // Test the current gpg.passphrase with gpg.private_key.
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
522 // If the test doesn't succeed, the passphrase is cleared and a non-null
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
523 // value is returned.
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
524 int gpg_test_passphrase(void)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
525 {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
526 char *s;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
527
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
528 if (!gpg.private_key)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
529 return -1; // No private key...
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
530
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
531 s = gpg_sign("test");
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
532 if (s) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
533 free(s);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
534 return 0; // Ok, test successful
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
535 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
536 // The passphrase is wrong (if provided)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
537 gpg_set_passphrase(NULL);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
538 return -1;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
539 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
540
1413
f89844a0448a Remove useless inlines
Mikael Berthe <mikael@lilotux.net>
parents: 1238
diff changeset
541 int gpg_enabled(void)
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
542 {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
543 return gpg.enabled;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
544 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
545
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
546 #else /* not HAVE_GPGME */
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
547
1413
f89844a0448a Remove useless inlines
Mikael Berthe <mikael@lilotux.net>
parents: 1238
diff changeset
548 int gpg_enabled(void)
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
549 {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
550 return 0;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
551 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
552
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
553 #endif /* HAVE_GPGME */
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
554
1811
e6d355e50d7a Update Vim modelines
Mikael Berthe <mikael@lilotux.net>
parents: 1668
diff changeset
555 /* vim: set et cindent cinoptions=>2\:2(0 ts=2 sw=2: For Vim users... */