Mercurial > ~mikael > mcabber > hg

annotate mcabber/src/pgp.c @ 1197:6f602d3270a4

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Add /pgp [-]force With this command it becomes possible to enforce PGP encryption without checking if the remote client has PGP support. It can be used to send encrypted offline messages too.
author Mikael Berthe <mikael@lilotux.net>
date Fri, 27 Apr 2007 00:37:57 +0200
parents 265e1d873d3e
children 2de8f8ba1f34
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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 Mikael Berthe <bmikael@lists.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
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153 // passphrase_cb()
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154 // GPGME passphrase callback function.
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155 static gpgme_error_t passphrase_cb(void *hook, const char *uid_hint,
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156 const char *passphrase_info, int prev_was_bad, int fd)
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157 {
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158 ssize_t len;
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159
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160 // Abort if we do not have the password.
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161 if (!gpg.passphrase) {
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162 write(fd, "\n", 1);
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163 return gpg_error(GPG_ERR_CANCELED);
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164 }
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165
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166 // Write the passphrase to the file descriptor.
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167 len = strlen(gpg.passphrase);
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168 if (write(fd, gpg.passphrase, len) != len)
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169 return gpg_error(GPG_ERR_CANCELED);
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170 if (write(fd, "\n", 1) != 1)
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171 return gpg_error(GPG_ERR_CANCELED);
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172
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173 return 0; // Success
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174 }
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175
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176 // gpg_verify(gpg_data, text, *sigsum)
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177 // Verify that gpg_data is a correct signature for text.
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178 // Return the key id (or fingerprint), and set *sigsum to
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179 // the gpgme signature summary value.
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180 // The returned string must be freed with g_free() after use.
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181 char *gpg_verify(const char *gpg_data, const char *text,
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182 gpgme_sigsum_t *sigsum)
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183 {
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184 gpgme_ctx_t ctx;
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185 gpgme_data_t data_sign, data_text;
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186 char *data;
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187 char *verified_key = NULL;
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188 gpgme_key_t key;
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189 gpgme_error_t err;
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190 const char prefix[] = "-----BEGIN PGP SIGNATURE-----\n\n";
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191 const char suffix[] = "\n-----END PGP SIGNATURE-----\n";
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192
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193 // Reset the summary.
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194 *sigsum = 0;
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195
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196 if (!gpg.enabled)
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197 return NULL;
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198
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199 err = gpgme_new(&ctx);
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200 if (err) {
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201 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
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202 "GPGME error: %s", gpgme_strerror(err));
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203 return NULL;
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204 }
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205
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206 gpgme_set_protocol(ctx, GPGME_PROTOCOL_OpenPGP);
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207
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208 // Surround the given data with the prefix & suffix
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209 data = g_new(char, sizeof(prefix) + sizeof(suffix) + strlen(gpg_data));
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210 strcpy(data, prefix);
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211 strcat(data, gpg_data);
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212 strcat(data, suffix);
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213
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214 err = gpgme_data_new_from_mem(&data_sign, data, strlen(data), 0);
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215 if (!err) {
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216 err = gpgme_data_new_from_mem(&data_text, text, strlen(text), 0);
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217 if (!err) {
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218 err = gpgme_op_verify(ctx, data_sign, data_text, 0);
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219 if (!err) {
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220 gpgme_verify_result_t vr = gpgme_op_verify_result(ctx);
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221 if (vr && vr->signatures) {
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222 char *r = vr->signatures->fpr;
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223 // Found the fingerprint. Let's try to get the key id.
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224 if (!gpgme_get_key(ctx, r, &key, 0) && key) {
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225 r = key->subkeys->keyid;
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226 gpgme_key_release(key);
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227 }
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228 // r is a static variable, let's copy it.
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229 verified_key = g_strdup(r);
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230 *sigsum = vr->signatures->summary;
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231 // For some reason summary could be 0 when status is 0 too,
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232 // which means the signature is valid...
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233 if (!*sigsum && !vr->signatures->status)
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234 *sigsum = GPGME_SIGSUM_GREEN;
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235 }
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236 }
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237 gpgme_data_release(data_text);
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238 }
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239 gpgme_data_release(data_sign);
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240 }
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241 if (err)
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242 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
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243 "GPGME verification error: %s", gpgme_strerror(err));
1041
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244 gpgme_release(ctx);
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245 g_free(data);
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246 return verified_key;
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247 }
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248
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249 // gpg_sign(gpg_data)
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250 // Return a signature of gpg_data (or NULL).
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251 // The returned string must be freed with g_free() after use.
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252 char *gpg_sign(const char *gpg_data)
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253 {
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254 gpgme_ctx_t ctx;
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255 gpgme_data_t in, out;
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256 char *p;
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257 char *signed_data = NULL;
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258 size_t nread;
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259 gpgme_key_t key;
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260 gpgme_error_t err;
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261
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262 if (!gpg.enabled || !gpg.private_key)
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263 return NULL;
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264
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265 err = gpgme_new(&ctx);
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266 if (err) {
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267 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
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268 "GPGME error: %s", gpgme_strerror(err));
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269 return NULL;
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270 }
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271
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272 gpgme_set_protocol(ctx, GPGME_PROTOCOL_OpenPGP);
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273 gpgme_set_textmode(ctx, 0);
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274 gpgme_set_armor(ctx, 1);
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275
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276 p = getenv("GPG_AGENT_INFO");
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277 if (!(p && strchr(p, ':')))
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278 gpgme_set_passphrase_cb(ctx, passphrase_cb, 0);
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279
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280 err = gpgme_get_key(ctx, gpg.private_key, &key, 1);
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281 if (err || !key) {
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282 scr_LogPrint(LPRINT_LOGNORM, "GPGME error: private key not found");
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283 gpgme_release(ctx);
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284 return NULL;
1041
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285 }
1049
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286
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287 gpgme_signers_clear(ctx);
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288 gpgme_signers_add(ctx, key);
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289 gpgme_key_release(key);
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290 err = gpgme_data_new_from_mem(&in, gpg_data, strlen(gpg_data), 0);
1041
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291 if (!err) {
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292 err = gpgme_data_new(&out);
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parents:
diff changeset
293 if (!err) {
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parents:
diff changeset
294 err = gpgme_op_sign(ctx, in, out, GPGME_SIG_MODE_DETACH);
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
295 if (!err) {
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parents:
diff changeset
296 signed_data = gpgme_data_release_and_get_mem(out, &nread);
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parents:
diff changeset
297 if (signed_data) {
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parents:
diff changeset
298 // We need to add a trailing NULL
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parents:
diff changeset
299 char *dd = g_strndup(signed_data, nread);
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
300 free(signed_data);
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Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
301 signed_data = strip_header_footer(dd);
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
302 g_free(dd);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
303 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
304 } else {
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parents:
diff changeset
305 gpgme_data_release(out);
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Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
306 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
307 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
308 gpgme_data_release(in);
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Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
309 }
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Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
310 if (err && err != GPG_ERR_CANCELED)
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
311 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
1047
0dc104d51dce PGP: Better error messages
Mikael Berthe <mikael@lilotux.net>
parents: 1041
diff changeset
312 "GPGME signature error: %s", gpgme_strerror(err));
1041
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
313 gpgme_release(ctx);
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parents:
diff changeset
314 return signed_data;
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parents:
diff changeset
315 }
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
316
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
317 // gpg_decrypt(gpg_data)
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parents:
diff changeset
318 // Return decrypted gpg_data (or NULL).
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parents:
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319 // The returned string must be freed with g_free() after use.
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parents:
diff changeset
320 char *gpg_decrypt(const char *gpg_data)
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Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
321 {
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parents:
diff changeset
322 gpgme_ctx_t ctx;
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parents:
diff changeset
323 gpgme_data_t in, out;
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parents:
diff changeset
324 char *p, *data;
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parents:
diff changeset
325 char *decrypted_data = NULL;
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
326 size_t nread;
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parents:
diff changeset
327 gpgme_error_t err;
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parents:
diff changeset
328 const char prefix[] = "-----BEGIN PGP MESSAGE-----\n\n";
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
329 const char suffix[] = "\n-----END PGP MESSAGE-----\n";
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
330
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parents:
diff changeset
331 if (!gpg.enabled)
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Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
332 return NULL;
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parents:
diff changeset
333
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
334 err = gpgme_new(&ctx);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
335 if (err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
336 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
337 "GPGME error: %s", gpgme_strerror(err));
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
338 return NULL;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
339 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
340
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
341 gpgme_set_protocol(ctx, GPGME_PROTOCOL_OpenPGP);
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
342
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Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
343 p = getenv("GPG_AGENT_INFO");
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
344 if (!(p && strchr(p, ':')))
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parents:
diff changeset
345 gpgme_set_passphrase_cb(ctx, passphrase_cb, 0);
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
346
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parents:
diff changeset
347 // Surround the given data with the prefix & suffix
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
348 data = g_new(char, sizeof(prefix) + sizeof(suffix) + strlen(gpg_data));
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
349 strcpy(data, prefix);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
350 strcat(data, gpg_data);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
351 strcat(data, suffix);
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Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
352
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
353 err = gpgme_data_new_from_mem(&in, data, strlen(data), 0);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
354 if (!err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
355 err = gpgme_data_new(&out);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
356 if (!err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
357 err = gpgme_op_decrypt(ctx, in, out);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
358 if (!err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
359 decrypted_data = gpgme_data_release_and_get_mem(out, &nread);
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
360 if (decrypted_data) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
361 // We need to add a trailing NULL
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
362 char *dd = g_strndup(decrypted_data, nread);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
363 free(decrypted_data);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
364 decrypted_data = dd;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
365 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
366 } else {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
367 gpgme_data_release(out);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
368 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
369 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
370 gpgme_data_release(in);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
371 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
372 if (err && err != GPG_ERR_CANCELED)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
373 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
1047
0dc104d51dce PGP: Better error messages
Mikael Berthe <mikael@lilotux.net>
parents: 1041
diff changeset
374 "GPGME decryption error: %s", gpgme_strerror(err));
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
375 gpgme_release(ctx);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
376 g_free(data);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
377 return decrypted_data;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
378 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
379
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
380 // gpg_encrypt(gpg_data, keyid)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
381 // Return encrypted gpg_data with the key keyid (or NULL).
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
382 // The returned string must be freed with g_free() after use.
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
383 char *gpg_encrypt(const char *gpg_data, const char *keyid)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
384 {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
385 gpgme_ctx_t ctx;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
386 gpgme_data_t in, out;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
387 char *encrypted_data = NULL, *edata;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
388 size_t nread;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
389 gpgme_key_t key;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
390 gpgme_error_t err;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
391
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
392 if (!gpg.enabled)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
393 return NULL;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
394
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
395 err = gpgme_new(&ctx);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
396 if (err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
397 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
398 "GPGME error: %s", gpgme_strerror(err));
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
399 return NULL;
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
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
402 gpgme_set_protocol(ctx, GPGME_PROTOCOL_OpenPGP);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
403 gpgme_set_textmode(ctx, 0);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
404 gpgme_set_armor(ctx, 1);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
405
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
406 err = gpgme_get_key(ctx, keyid, &key, 0);
1105
265e1d873d3e PGP: Improve checks for missing keys
Mikael Berthe <mikael@lilotux.net>
parents: 1057
diff changeset
407 if (!err && key) {
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
408 gpgme_key_t keys[] = { key, 0 };
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
409 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
410 if (!err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
411 err = gpgme_data_new(&out);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
412 if (!err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
413 err = gpgme_op_encrypt(ctx, keys, GPGME_ENCRYPT_ALWAYS_TRUST, in, out);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
414 if (!err)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
415 encrypted_data = gpgme_data_release_and_get_mem(out, &nread);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
416 else
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
417 gpgme_data_release(out);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
418 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
419 gpgme_data_release(in);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
420 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
421 gpgme_key_release(key);
1047
0dc104d51dce PGP: Better error messages
Mikael Berthe <mikael@lilotux.net>
parents: 1041
diff changeset
422 } else {
0dc104d51dce PGP: Better error messages
Mikael Berthe <mikael@lilotux.net>
parents: 1041
diff changeset
423 scr_LogPrint(LPRINT_LOGNORM, "GPGME encryption error: key not found");
0dc104d51dce PGP: Better error messages
Mikael Berthe <mikael@lilotux.net>
parents: 1041
diff changeset
424 err = 0;
1041
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 encryption 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 edata = strip_header_footer(encrypted_data);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
431 if (encrypted_data)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
432 free(encrypted_data);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
433 return edata;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
434 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
435
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
436 // gpg_test_passphrase()
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
437 // Test the current gpg.passphrase with gpg.private_key.
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
438 // If the test doesn't succeed, the passphrase is cleared and a non-null
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439 // value is returned.
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440 int gpg_test_passphrase(void)
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441 {
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442 char *s;
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443
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444 if (!gpg.private_key)
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445 return -1; // No private key...
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446
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447 s = gpg_sign("test");
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448 if (s) {
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449 free(s);
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450 return 0; // Ok, test successful
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451 }
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452 // The passphrase is wrong (if provided)
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453 gpg_set_passphrase(NULL);
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454 return -1;
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455 }
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456
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457 inline int gpg_enabled(void)
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458 {
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459 return gpg.enabled;
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460 }
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461
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462 #else /* not HAVE_GPGME */
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463
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464 inline int gpg_enabled(void)
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465 {
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466 return 0;
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467 }
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468
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469 #endif /* HAVE_GPGME */
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470
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471 /* vim: set expandtab cindent cinoptions=>2\:2(0: For Vim users... */