Mercurial > ~mikael > mcabber > hg

annotate mcabber/src/pgp.c @ 1223:591d8b35c881

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Disable gpg-agent Disable gpg-agent as it doesn't seem to work very well.
author Mikael Berthe <mikael@lilotux.net>
date Thu, 17 May 2007 10:55:49 +0200
parents 2de8f8ba1f34
children 80008fe2a4f2
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1 /*
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2 * pgp.c -- PGP utility functions
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3 *
1205
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4 * Copyright (C) 2006-2007 Mikael Berthe <mikael@lilotux.net>
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5 * Some parts inspired by centericq (impgp.cc)
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6 *
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7 * This program is free software; you can redistribute it and/or modify
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8 * it under the terms of the GNU General Public License as published by
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9 * the Free Software Foundation; either version 2 of the License, or (at
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10 * your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU General Public License
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18 * along with this program; if not, write to the Free Software
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19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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20 * USA
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21 */
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22
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23 #include <config.h>
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24
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25 #ifdef HAVE_GPGME
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26
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27 #include <stdlib.h>
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28 #include <string.h>
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29 #include <unistd.h>
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30 #include <locale.h>
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31 #include <sys/mman.h>
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32 #include <glib.h>
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33
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34 #include "pgp.h"
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35 #include "logprint.h"
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36
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37 #define MIN_GPGME_VERSION "1.0.0"
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38
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39 static struct gpg_struct
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40 {
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41 int enabled;
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42 char *private_key;
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43 char *passphrase;
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44 } gpg;
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45
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46
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47 // gpg_init(priv_key, passphrase)
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48 // Initialize the GPG sub-systems. This function must be invoked early.
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49 // Note: priv_key & passphrase are optional, they can be set later.
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50 // This function returns 0 if gpgme is available and initialized;
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51 // if not it returns the gpgme error code.
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52 int gpg_init(const char *priv_key, const char *passphrase)
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53 {
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54 gpgme_error_t err;
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55
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56 // Check for version and OpenPGP protocol support.
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57 if (!gpgme_check_version(MIN_GPGME_VERSION)) {
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58 scr_LogPrint(LPRINT_LOGNORM,
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59 "GPGME initialization error: Bad library version");
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60 return -1;
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61 }
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62
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63 err = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
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64 if (err) {
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65 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
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66 "GPGME initialization error: %s", gpgme_strerror(err));
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67 return err;
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68 }
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69
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70 // Set the locale information.
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71 gpgme_set_locale(NULL, LC_CTYPE, setlocale(LC_CTYPE, NULL));
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72 gpgme_set_locale(NULL, LC_MESSAGES, setlocale(LC_MESSAGES, NULL));
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73
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74 // Store private data.
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75 gpg_set_private_key(priv_key);
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76 gpg_set_passphrase(passphrase);
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77
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78 gpg.enabled = 1;
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79 return 0;
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80 }
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81
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82 // gpg_terminate()
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83 // Destroy data and free memory.
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84 void gpg_terminate(void)
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85 {
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86 gpg.enabled = 0;
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87 gpg_set_passphrase(NULL);
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88 gpg_set_private_key(NULL);
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89 }
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90
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91 // gpg_set_passphrase(passphrase)
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92 // Set the current passphrase (use NULL to erase it).
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93 void gpg_set_passphrase(const char *passphrase)
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94 {
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95 // Remove current passphrase
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96 if (gpg.passphrase) {
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97 ssize_t len = strlen(gpg.passphrase);
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98 memset(gpg.passphrase, 0, len);
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99 munlock(gpg.passphrase, len);
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100 g_free(gpg.passphrase);
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101 }
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102 if (passphrase) {
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103 gpg.passphrase = g_strdup(passphrase);
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104 mlock(gpg.passphrase, strlen(gpg.passphrase));
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105 } else {
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106 gpg.passphrase = NULL;
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107 }
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108 }
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109
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110 // gpg_set_private_key(keyid)
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111 // Set the current private key id (use NULL to unset it).
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112 void gpg_set_private_key(const char *priv_keyid)
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113 {
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114 g_free(gpg.private_key);
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115 if (priv_keyid)
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116 gpg.private_key = g_strdup(priv_keyid);
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117 else
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118 gpg.private_key = NULL;
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119 }
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120
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121 // strip_header_footer(data)
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122 // Remove PGP header & footer from data.
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123 // Return a new string, or NULL.
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124 // The string must be freed by the caller with g_free() when no longer needed.
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125 static char *strip_header_footer(const char *data)
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126 {
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127 char *p, *q;
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128
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129 if (!data)
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130 return NULL;
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131
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132 // p: beginning of real data
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133 // q: end of real data
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134
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135 // Strip header (to the first empty line)
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136 p = strstr(data, "\n\n");
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137 if (!p)
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138 return g_strdup(data);
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139
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140 // Strip footer
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141 // We want to remove the last lines, until the line beginning with a '-'
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142 p += 2;
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143 for (q = p ; *q; q++) ;
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144 // (q is at the end of data now)
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145 for (q--; q > p && (*q != '\n' || *(q+1) != '-'); q--) ;
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146
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147 if (q <= p)
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148 return NULL; // Shouldn't happen...
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149
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150 return g_strndup(p, q-p);
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151 }
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152
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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));
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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 *signed_data = NULL;
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257 size_t nread;
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258 gpgme_key_t key;
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259 gpgme_error_t err;
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260 //char *p;
1041
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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 /*
1041
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277 p = getenv("GPG_AGENT_INFO");
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278 if (!(p && strchr(p, ':')))
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279 gpgme_set_passphrase_cb(ctx, passphrase_cb, 0);
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280 */
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281 gpgme_set_passphrase_cb(ctx, passphrase_cb, 0);
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282
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283 err = gpgme_get_key(ctx, gpg.private_key, &key, 1);
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284 if (err || !key) {
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285 scr_LogPrint(LPRINT_LOGNORM, "GPGME error: private key not found");
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286 gpgme_release(ctx);
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287 return NULL;
1041
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288 }
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289
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290 gpgme_signers_clear(ctx);
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291 gpgme_signers_add(ctx, key);
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292 gpgme_key_release(key);
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Mikael Berthe <mikael@lilotux.net>
parents: 1047
diff changeset
293 err = gpgme_data_new_from_mem(&in, gpg_data, strlen(gpg_data), 0);
1041
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parents:
diff changeset
294 if (!err) {
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parents:
diff changeset
295 err = gpgme_data_new(&out);
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
296 if (!err) {
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Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
297 err = gpgme_op_sign(ctx, in, out, GPGME_SIG_MODE_DETACH);
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parents:
diff changeset
298 if (!err) {
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parents:
diff changeset
299 signed_data = gpgme_data_release_and_get_mem(out, &nread);
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
300 if (signed_data) {
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parents:
diff changeset
301 // We need to add a trailing NULL
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Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
302 char *dd = g_strndup(signed_data, nread);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
303 free(signed_data);
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Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
304 signed_data = strip_header_footer(dd);
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Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
305 g_free(dd);
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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 } else {
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
308 gpgme_data_release(out);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
309 }
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
310 }
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parents:
diff changeset
311 gpgme_data_release(in);
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Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
312 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
313 if (err && err != GPG_ERR_CANCELED)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
314 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
1047
0dc104d51dce PGP: Better error messages
Mikael Berthe <mikael@lilotux.net>
parents: 1041
diff changeset
315 "GPGME signature error: %s", gpgme_strerror(err));
1041
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
316 gpgme_release(ctx);
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Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
317 return signed_data;
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Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
318 }
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
319
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parents:
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320 // gpg_decrypt(gpg_data)
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parents:
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321 // Return decrypted gpg_data (or NULL).
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parents:
diff changeset
322 // The returned string must be freed with g_free() after use.
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Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
323 char *gpg_decrypt(const char *gpg_data)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
324 {
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parents:
diff changeset
325 gpgme_ctx_t ctx;
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parents:
diff changeset
326 gpgme_data_t in, out;
1223
591d8b35c881 Disable gpg-agent
Mikael Berthe <mikael@lilotux.net>
parents: 1205
diff changeset
327 char *data;
1041
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
328 char *decrypted_data = NULL;
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
329 size_t nread;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
330 gpgme_error_t err;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
331 const char prefix[] = "-----BEGIN PGP MESSAGE-----\n\n";
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
332 const char suffix[] = "\n-----END PGP MESSAGE-----\n";
1223
591d8b35c881 Disable gpg-agent
Mikael Berthe <mikael@lilotux.net>
parents: 1205
diff changeset
333 //char *p;
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
334
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
335 if (!gpg.enabled)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
336 return NULL;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
337
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
338 err = gpgme_new(&ctx);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
339 if (err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
340 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
341 "GPGME error: %s", gpgme_strerror(err));
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
342 return NULL;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
343 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
344
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
345 gpgme_set_protocol(ctx, GPGME_PROTOCOL_OpenPGP);
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
346
1223
591d8b35c881 Disable gpg-agent
Mikael Berthe <mikael@lilotux.net>
parents: 1205
diff changeset
347 /*
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
348 p = getenv("GPG_AGENT_INFO");
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
349 if (!(p && strchr(p, ':')))
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
350 gpgme_set_passphrase_cb(ctx, passphrase_cb, 0);
1223
591d8b35c881 Disable gpg-agent
Mikael Berthe <mikael@lilotux.net>
parents: 1205
diff changeset
351 */
591d8b35c881 Disable gpg-agent
Mikael Berthe <mikael@lilotux.net>
parents: 1205
diff changeset
352 gpgme_set_passphrase_cb(ctx, passphrase_cb, 0);
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
353
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
354 // Surround the given data with the prefix & suffix
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
355 data = g_new(char, sizeof(prefix) + sizeof(suffix) + strlen(gpg_data));
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
356 strcpy(data, prefix);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
357 strcat(data, gpg_data);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
358 strcat(data, suffix);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
359
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
360 err = gpgme_data_new_from_mem(&in, data, strlen(data), 0);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
361 if (!err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
362 err = gpgme_data_new(&out);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
363 if (!err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
364 err = gpgme_op_decrypt(ctx, in, out);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
365 if (!err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
366 decrypted_data = gpgme_data_release_and_get_mem(out, &nread);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
367 if (decrypted_data) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
368 // We need to add a trailing NULL
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
369 char *dd = g_strndup(decrypted_data, nread);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
370 free(decrypted_data);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
371 decrypted_data = dd;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
372 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
373 } else {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
374 gpgme_data_release(out);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
375 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
376 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
377 gpgme_data_release(in);
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 if (err && err != GPG_ERR_CANCELED)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
380 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
1047
0dc104d51dce PGP: Better error messages
Mikael Berthe <mikael@lilotux.net>
parents: 1041
diff changeset
381 "GPGME decryption error: %s", gpgme_strerror(err));
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
382 gpgme_release(ctx);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
383 g_free(data);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
384 return decrypted_data;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
385 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
386
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
387 // gpg_encrypt(gpg_data, keyid)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
388 // Return encrypted gpg_data with the key keyid (or NULL).
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
389 // The returned string must be freed with g_free() after use.
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
390 char *gpg_encrypt(const char *gpg_data, const char *keyid)
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 gpgme_ctx_t ctx;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
393 gpgme_data_t in, out;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
394 char *encrypted_data = NULL, *edata;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
395 size_t nread;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
396 gpgme_key_t key;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
397 gpgme_error_t err;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
398
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
399 if (!gpg.enabled)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
400 return NULL;
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 err = gpgme_new(&ctx);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
403 if (err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
404 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
405 "GPGME error: %s", gpgme_strerror(err));
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
406 return NULL;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
407 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
408
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
409 gpgme_set_protocol(ctx, GPGME_PROTOCOL_OpenPGP);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
410 gpgme_set_textmode(ctx, 0);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
411 gpgme_set_armor(ctx, 1);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
412
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
413 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
414 if (!err && key) {
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
415 gpgme_key_t keys[] = { key, 0 };
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
416 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
417 if (!err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
418 err = gpgme_data_new(&out);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
419 if (!err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
420 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
421 if (!err)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
422 encrypted_data = gpgme_data_release_and_get_mem(out, &nread);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
423 else
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
424 gpgme_data_release(out);
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 gpgme_data_release(in);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
427 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
428 gpgme_key_release(key);
1047
0dc104d51dce PGP: Better error messages
Mikael Berthe <mikael@lilotux.net>
parents: 1041
diff changeset
429 } else {
0dc104d51dce PGP: Better error messages
Mikael Berthe <mikael@lilotux.net>
parents: 1041
diff changeset
430 scr_LogPrint(LPRINT_LOGNORM, "GPGME encryption error: key not found");
0dc104d51dce PGP: Better error messages
Mikael Berthe <mikael@lilotux.net>
parents: 1041
diff changeset
431 err = 0;
1041
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 if (err && err != GPG_ERR_CANCELED)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
434 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
1047
0dc104d51dce PGP: Better error messages
Mikael Berthe <mikael@lilotux.net>
parents: 1041
diff changeset
435 "GPGME encryption error: %s", gpgme_strerror(err));
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
436 gpgme_release(ctx);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
437 edata = strip_header_footer(encrypted_data);
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438 if (encrypted_data)
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439 free(encrypted_data);
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440 return edata;
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441 }
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442
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443 // gpg_test_passphrase()
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444 // Test the current gpg.passphrase with gpg.private_key.
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445 // If the test doesn't succeed, the passphrase is cleared and a non-null
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446 // value is returned.
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447 int gpg_test_passphrase(void)
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448 {
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449 char *s;
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450
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451 if (!gpg.private_key)
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452 return -1; // No private key...
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453
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454 s = gpg_sign("test");
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455 if (s) {
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456 free(s);
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457 return 0; // Ok, test successful
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458 }
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459 // The passphrase is wrong (if provided)
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460 gpg_set_passphrase(NULL);
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461 return -1;
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462 }
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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 gpg.enabled;
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467 }
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468
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469 #else /* not HAVE_GPGME */
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470
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471 inline int gpg_enabled(void)
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472 {
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473 return 0;
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474 }
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475
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476 #endif /* HAVE_GPGME */
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477
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478 /* vim: set expandtab cindent cinoptions=>2\:2(0: For Vim users... */