| 1 | /* GnuTLS glue for GNU Emacs. |
| 2 | Copyright (C) 2010-2014 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GNU Emacs. |
| 5 | |
| 6 | GNU Emacs is free software: you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation, either version 3 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | GNU Emacs is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #include <config.h> |
| 20 | #include <errno.h> |
| 21 | |
| 22 | #include "lisp.h" |
| 23 | #include "process.h" |
| 24 | #include "coding.h" |
| 25 | |
| 26 | #ifdef HAVE_GNUTLS |
| 27 | #include <gnutls/gnutls.h> |
| 28 | |
| 29 | #ifdef WINDOWSNT |
| 30 | #include <windows.h> |
| 31 | #include "w32.h" |
| 32 | #endif |
| 33 | |
| 34 | static bool emacs_gnutls_handle_error (gnutls_session_t, int); |
| 35 | |
| 36 | static Lisp_Object Qgnutls_dll; |
| 37 | static Lisp_Object Qgnutls_code; |
| 38 | static Lisp_Object Qgnutls_anon, Qgnutls_x509pki; |
| 39 | static Lisp_Object Qgnutls_e_interrupted, Qgnutls_e_again, |
| 40 | Qgnutls_e_invalid_session, Qgnutls_e_not_ready_for_handshake; |
| 41 | static bool gnutls_global_initialized; |
| 42 | |
| 43 | /* The following are for the property list of `gnutls-boot'. */ |
| 44 | static Lisp_Object QCgnutls_bootprop_priority; |
| 45 | static Lisp_Object QCgnutls_bootprop_trustfiles; |
| 46 | static Lisp_Object QCgnutls_bootprop_keylist; |
| 47 | static Lisp_Object QCgnutls_bootprop_crlfiles; |
| 48 | static Lisp_Object QCgnutls_bootprop_callbacks; |
| 49 | static Lisp_Object QCgnutls_bootprop_loglevel; |
| 50 | static Lisp_Object QCgnutls_bootprop_hostname; |
| 51 | static Lisp_Object QCgnutls_bootprop_min_prime_bits; |
| 52 | static Lisp_Object QCgnutls_bootprop_verify_flags; |
| 53 | static Lisp_Object QCgnutls_bootprop_verify_error; |
| 54 | |
| 55 | /* Callback keys for `gnutls-boot'. Unused currently. */ |
| 56 | static Lisp_Object QCgnutls_bootprop_callbacks_verify; |
| 57 | |
| 58 | static void gnutls_log_function (int, const char *); |
| 59 | static void gnutls_log_function2 (int, const char *, const char *); |
| 60 | #ifdef HAVE_GNUTLS3 |
| 61 | static void gnutls_audit_log_function (gnutls_session_t, const char *); |
| 62 | #endif |
| 63 | |
| 64 | \f |
| 65 | #ifdef WINDOWSNT |
| 66 | |
| 67 | /* Macro for defining functions that will be loaded from the GnuTLS DLL. */ |
| 68 | #define DEF_GNUTLS_FN(rettype,func,args) static rettype (FAR CDECL *fn_##func)args |
| 69 | |
| 70 | /* Macro for loading GnuTLS functions from the library. */ |
| 71 | #define LOAD_GNUTLS_FN(lib,func) { \ |
| 72 | fn_##func = (void *) GetProcAddress (lib, #func); \ |
| 73 | if (!fn_##func) return 0; \ |
| 74 | } |
| 75 | |
| 76 | DEF_GNUTLS_FN (gnutls_alert_description_t, gnutls_alert_get, |
| 77 | (gnutls_session_t)); |
| 78 | DEF_GNUTLS_FN (const char *, gnutls_alert_get_name, |
| 79 | (gnutls_alert_description_t)); |
| 80 | DEF_GNUTLS_FN (int, gnutls_alert_send_appropriate, (gnutls_session_t, int)); |
| 81 | DEF_GNUTLS_FN (int, gnutls_anon_allocate_client_credentials, |
| 82 | (gnutls_anon_client_credentials_t *)); |
| 83 | DEF_GNUTLS_FN (void, gnutls_anon_free_client_credentials, |
| 84 | (gnutls_anon_client_credentials_t)); |
| 85 | DEF_GNUTLS_FN (int, gnutls_bye, (gnutls_session_t, gnutls_close_request_t)); |
| 86 | DEF_GNUTLS_FN (int, gnutls_certificate_allocate_credentials, |
| 87 | (gnutls_certificate_credentials_t *)); |
| 88 | DEF_GNUTLS_FN (void, gnutls_certificate_free_credentials, |
| 89 | (gnutls_certificate_credentials_t)); |
| 90 | DEF_GNUTLS_FN (const gnutls_datum_t *, gnutls_certificate_get_peers, |
| 91 | (gnutls_session_t, unsigned int *)); |
| 92 | DEF_GNUTLS_FN (void, gnutls_certificate_set_verify_flags, |
| 93 | (gnutls_certificate_credentials_t, unsigned int)); |
| 94 | DEF_GNUTLS_FN (int, gnutls_certificate_set_x509_crl_file, |
| 95 | (gnutls_certificate_credentials_t, const char *, |
| 96 | gnutls_x509_crt_fmt_t)); |
| 97 | DEF_GNUTLS_FN (int, gnutls_certificate_set_x509_key_file, |
| 98 | (gnutls_certificate_credentials_t, const char *, const char *, |
| 99 | gnutls_x509_crt_fmt_t)); |
| 100 | DEF_GNUTLS_FN (int, gnutls_certificate_set_x509_trust_file, |
| 101 | (gnutls_certificate_credentials_t, const char *, |
| 102 | gnutls_x509_crt_fmt_t)); |
| 103 | DEF_GNUTLS_FN (gnutls_certificate_type_t, gnutls_certificate_type_get, |
| 104 | (gnutls_session_t)); |
| 105 | DEF_GNUTLS_FN (int, gnutls_certificate_verify_peers2, |
| 106 | (gnutls_session_t, unsigned int *)); |
| 107 | DEF_GNUTLS_FN (int, gnutls_credentials_set, |
| 108 | (gnutls_session_t, gnutls_credentials_type_t, void *)); |
| 109 | DEF_GNUTLS_FN (void, gnutls_deinit, (gnutls_session_t)); |
| 110 | DEF_GNUTLS_FN (void, gnutls_dh_set_prime_bits, |
| 111 | (gnutls_session_t, unsigned int)); |
| 112 | DEF_GNUTLS_FN (int, gnutls_error_is_fatal, (int)); |
| 113 | DEF_GNUTLS_FN (int, gnutls_global_init, (void)); |
| 114 | DEF_GNUTLS_FN (void, gnutls_global_set_log_function, (gnutls_log_func)); |
| 115 | #ifdef HAVE_GNUTLS3 |
| 116 | DEF_GNUTLS_FN (void, gnutls_global_set_audit_log_function, (gnutls_audit_log_func)); |
| 117 | #endif |
| 118 | DEF_GNUTLS_FN (void, gnutls_global_set_log_level, (int)); |
| 119 | DEF_GNUTLS_FN (void, gnutls_global_set_mem_functions, |
| 120 | (gnutls_alloc_function, gnutls_alloc_function, |
| 121 | gnutls_is_secure_function, gnutls_realloc_function, |
| 122 | gnutls_free_function)); |
| 123 | DEF_GNUTLS_FN (int, gnutls_handshake, (gnutls_session_t)); |
| 124 | DEF_GNUTLS_FN (int, gnutls_init, (gnutls_session_t *, gnutls_connection_end_t)); |
| 125 | DEF_GNUTLS_FN (int, gnutls_priority_set_direct, |
| 126 | (gnutls_session_t, const char *, const char **)); |
| 127 | DEF_GNUTLS_FN (size_t, gnutls_record_check_pending, (gnutls_session_t)); |
| 128 | DEF_GNUTLS_FN (ssize_t, gnutls_record_recv, (gnutls_session_t, void *, size_t)); |
| 129 | DEF_GNUTLS_FN (ssize_t, gnutls_record_send, |
| 130 | (gnutls_session_t, const void *, size_t)); |
| 131 | DEF_GNUTLS_FN (const char *, gnutls_strerror, (int)); |
| 132 | DEF_GNUTLS_FN (void, gnutls_transport_set_errno, (gnutls_session_t, int)); |
| 133 | DEF_GNUTLS_FN (const char *, gnutls_check_version, (const char *)); |
| 134 | DEF_GNUTLS_FN (void, gnutls_transport_set_lowat, (gnutls_session_t, int)); |
| 135 | DEF_GNUTLS_FN (void, gnutls_transport_set_ptr2, |
| 136 | (gnutls_session_t, gnutls_transport_ptr_t, |
| 137 | gnutls_transport_ptr_t)); |
| 138 | DEF_GNUTLS_FN (void, gnutls_transport_set_pull_function, |
| 139 | (gnutls_session_t, gnutls_pull_func)); |
| 140 | DEF_GNUTLS_FN (void, gnutls_transport_set_push_function, |
| 141 | (gnutls_session_t, gnutls_push_func)); |
| 142 | DEF_GNUTLS_FN (int, gnutls_x509_crt_check_hostname, |
| 143 | (gnutls_x509_crt_t, const char *)); |
| 144 | DEF_GNUTLS_FN (void, gnutls_x509_crt_deinit, (gnutls_x509_crt_t)); |
| 145 | DEF_GNUTLS_FN (int, gnutls_x509_crt_import, |
| 146 | (gnutls_x509_crt_t, const gnutls_datum_t *, |
| 147 | gnutls_x509_crt_fmt_t)); |
| 148 | DEF_GNUTLS_FN (int, gnutls_x509_crt_init, (gnutls_x509_crt_t *)); |
| 149 | |
| 150 | static bool |
| 151 | init_gnutls_functions (void) |
| 152 | { |
| 153 | HMODULE library; |
| 154 | int max_log_level = 1; |
| 155 | |
| 156 | if (!(library = w32_delayed_load (Qgnutls_dll))) |
| 157 | { |
| 158 | GNUTLS_LOG (1, max_log_level, "GnuTLS library not found"); |
| 159 | return 0; |
| 160 | } |
| 161 | |
| 162 | LOAD_GNUTLS_FN (library, gnutls_alert_get); |
| 163 | LOAD_GNUTLS_FN (library, gnutls_alert_get_name); |
| 164 | LOAD_GNUTLS_FN (library, gnutls_alert_send_appropriate); |
| 165 | LOAD_GNUTLS_FN (library, gnutls_anon_allocate_client_credentials); |
| 166 | LOAD_GNUTLS_FN (library, gnutls_anon_free_client_credentials); |
| 167 | LOAD_GNUTLS_FN (library, gnutls_bye); |
| 168 | LOAD_GNUTLS_FN (library, gnutls_certificate_allocate_credentials); |
| 169 | LOAD_GNUTLS_FN (library, gnutls_certificate_free_credentials); |
| 170 | LOAD_GNUTLS_FN (library, gnutls_certificate_get_peers); |
| 171 | LOAD_GNUTLS_FN (library, gnutls_certificate_set_verify_flags); |
| 172 | LOAD_GNUTLS_FN (library, gnutls_certificate_set_x509_crl_file); |
| 173 | LOAD_GNUTLS_FN (library, gnutls_certificate_set_x509_key_file); |
| 174 | LOAD_GNUTLS_FN (library, gnutls_certificate_set_x509_trust_file); |
| 175 | LOAD_GNUTLS_FN (library, gnutls_certificate_type_get); |
| 176 | LOAD_GNUTLS_FN (library, gnutls_certificate_verify_peers2); |
| 177 | LOAD_GNUTLS_FN (library, gnutls_credentials_set); |
| 178 | LOAD_GNUTLS_FN (library, gnutls_deinit); |
| 179 | LOAD_GNUTLS_FN (library, gnutls_dh_set_prime_bits); |
| 180 | LOAD_GNUTLS_FN (library, gnutls_error_is_fatal); |
| 181 | LOAD_GNUTLS_FN (library, gnutls_global_init); |
| 182 | LOAD_GNUTLS_FN (library, gnutls_global_set_log_function); |
| 183 | #ifdef HAVE_GNUTLS3 |
| 184 | LOAD_GNUTLS_FN (library, gnutls_global_set_audit_log_function); |
| 185 | #endif |
| 186 | LOAD_GNUTLS_FN (library, gnutls_global_set_log_level); |
| 187 | LOAD_GNUTLS_FN (library, gnutls_global_set_mem_functions); |
| 188 | LOAD_GNUTLS_FN (library, gnutls_handshake); |
| 189 | LOAD_GNUTLS_FN (library, gnutls_init); |
| 190 | LOAD_GNUTLS_FN (library, gnutls_priority_set_direct); |
| 191 | LOAD_GNUTLS_FN (library, gnutls_record_check_pending); |
| 192 | LOAD_GNUTLS_FN (library, gnutls_record_recv); |
| 193 | LOAD_GNUTLS_FN (library, gnutls_record_send); |
| 194 | LOAD_GNUTLS_FN (library, gnutls_strerror); |
| 195 | LOAD_GNUTLS_FN (library, gnutls_transport_set_errno); |
| 196 | LOAD_GNUTLS_FN (library, gnutls_check_version); |
| 197 | /* We don't need to call gnutls_transport_set_lowat in GnuTLS 2.11.1 |
| 198 | and later, and the function was removed entirely in 3.0.0. */ |
| 199 | if (!fn_gnutls_check_version ("2.11.1")) |
| 200 | LOAD_GNUTLS_FN (library, gnutls_transport_set_lowat); |
| 201 | LOAD_GNUTLS_FN (library, gnutls_transport_set_ptr2); |
| 202 | LOAD_GNUTLS_FN (library, gnutls_transport_set_pull_function); |
| 203 | LOAD_GNUTLS_FN (library, gnutls_transport_set_push_function); |
| 204 | LOAD_GNUTLS_FN (library, gnutls_x509_crt_check_hostname); |
| 205 | LOAD_GNUTLS_FN (library, gnutls_x509_crt_deinit); |
| 206 | LOAD_GNUTLS_FN (library, gnutls_x509_crt_import); |
| 207 | LOAD_GNUTLS_FN (library, gnutls_x509_crt_init); |
| 208 | |
| 209 | max_log_level = global_gnutls_log_level; |
| 210 | |
| 211 | { |
| 212 | Lisp_Object name = CAR_SAFE (Fget (Qgnutls_dll, QCloaded_from)); |
| 213 | GNUTLS_LOG2 (1, max_log_level, "GnuTLS library loaded:", |
| 214 | STRINGP (name) ? (const char *) SDATA (name) : "unknown"); |
| 215 | } |
| 216 | |
| 217 | return 1; |
| 218 | } |
| 219 | |
| 220 | #else /* !WINDOWSNT */ |
| 221 | |
| 222 | #define fn_gnutls_alert_get gnutls_alert_get |
| 223 | #define fn_gnutls_alert_get_name gnutls_alert_get_name |
| 224 | #define fn_gnutls_alert_send_appropriate gnutls_alert_send_appropriate |
| 225 | #define fn_gnutls_anon_allocate_client_credentials gnutls_anon_allocate_client_credentials |
| 226 | #define fn_gnutls_anon_free_client_credentials gnutls_anon_free_client_credentials |
| 227 | #define fn_gnutls_bye gnutls_bye |
| 228 | #define fn_gnutls_certificate_allocate_credentials gnutls_certificate_allocate_credentials |
| 229 | #define fn_gnutls_certificate_free_credentials gnutls_certificate_free_credentials |
| 230 | #define fn_gnutls_certificate_get_peers gnutls_certificate_get_peers |
| 231 | #define fn_gnutls_certificate_set_verify_flags gnutls_certificate_set_verify_flags |
| 232 | #define fn_gnutls_certificate_set_x509_crl_file gnutls_certificate_set_x509_crl_file |
| 233 | #define fn_gnutls_certificate_set_x509_key_file gnutls_certificate_set_x509_key_file |
| 234 | #define fn_gnutls_certificate_set_x509_trust_file gnutls_certificate_set_x509_trust_file |
| 235 | #define fn_gnutls_certificate_type_get gnutls_certificate_type_get |
| 236 | #define fn_gnutls_certificate_verify_peers2 gnutls_certificate_verify_peers2 |
| 237 | #define fn_gnutls_credentials_set gnutls_credentials_set |
| 238 | #define fn_gnutls_deinit gnutls_deinit |
| 239 | #define fn_gnutls_dh_set_prime_bits gnutls_dh_set_prime_bits |
| 240 | #define fn_gnutls_error_is_fatal gnutls_error_is_fatal |
| 241 | #define fn_gnutls_global_init gnutls_global_init |
| 242 | #define fn_gnutls_global_set_log_function gnutls_global_set_log_function |
| 243 | #ifdef HAVE_GNUTLS3 |
| 244 | #define fn_gnutls_global_set_audit_log_function gnutls_global_set_audit_log_function |
| 245 | #endif |
| 246 | #define fn_gnutls_global_set_log_level gnutls_global_set_log_level |
| 247 | #define fn_gnutls_global_set_mem_functions gnutls_global_set_mem_functions |
| 248 | #define fn_gnutls_handshake gnutls_handshake |
| 249 | #define fn_gnutls_init gnutls_init |
| 250 | #define fn_gnutls_priority_set_direct gnutls_priority_set_direct |
| 251 | #define fn_gnutls_record_check_pending gnutls_record_check_pending |
| 252 | #define fn_gnutls_record_recv gnutls_record_recv |
| 253 | #define fn_gnutls_record_send gnutls_record_send |
| 254 | #define fn_gnutls_strerror gnutls_strerror |
| 255 | #ifdef WINDOWSNT |
| 256 | #define fn_gnutls_transport_set_errno gnutls_transport_set_errno |
| 257 | #endif |
| 258 | #define fn_gnutls_transport_set_ptr2 gnutls_transport_set_ptr2 |
| 259 | #define fn_gnutls_x509_crt_check_hostname gnutls_x509_crt_check_hostname |
| 260 | #define fn_gnutls_x509_crt_deinit gnutls_x509_crt_deinit |
| 261 | #define fn_gnutls_x509_crt_import gnutls_x509_crt_import |
| 262 | #define fn_gnutls_x509_crt_init gnutls_x509_crt_init |
| 263 | |
| 264 | #endif /* !WINDOWSNT */ |
| 265 | |
| 266 | \f |
| 267 | #ifdef HAVE_GNUTLS3 |
| 268 | /* Function to log a simple audit message. */ |
| 269 | static void |
| 270 | gnutls_audit_log_function (gnutls_session_t session, const char *string) |
| 271 | { |
| 272 | if (global_gnutls_log_level >= 1) |
| 273 | { |
| 274 | message ("gnutls.c: [audit] %s", string); |
| 275 | } |
| 276 | } |
| 277 | #endif |
| 278 | |
| 279 | /* Function to log a simple message. */ |
| 280 | static void |
| 281 | gnutls_log_function (int level, const char *string) |
| 282 | { |
| 283 | message ("gnutls.c: [%d] %s", level, string); |
| 284 | } |
| 285 | |
| 286 | /* Function to log a message and a string. */ |
| 287 | static void |
| 288 | gnutls_log_function2 (int level, const char *string, const char *extra) |
| 289 | { |
| 290 | message ("gnutls.c: [%d] %s %s", level, string, extra); |
| 291 | } |
| 292 | |
| 293 | /* Function to log a message and an integer. */ |
| 294 | static void |
| 295 | gnutls_log_function2i (int level, const char *string, int extra) |
| 296 | { |
| 297 | message ("gnutls.c: [%d] %s %d", level, string, extra); |
| 298 | } |
| 299 | |
| 300 | static int |
| 301 | emacs_gnutls_handshake (struct Lisp_Process *proc) |
| 302 | { |
| 303 | gnutls_session_t state = proc->gnutls_state; |
| 304 | int ret; |
| 305 | |
| 306 | if (proc->gnutls_initstage < GNUTLS_STAGE_HANDSHAKE_CANDO) |
| 307 | return -1; |
| 308 | |
| 309 | if (proc->gnutls_initstage < GNUTLS_STAGE_TRANSPORT_POINTERS_SET) |
| 310 | { |
| 311 | #ifdef WINDOWSNT |
| 312 | /* On W32 we cannot transfer socket handles between different runtime |
| 313 | libraries, so we tell GnuTLS to use our special push/pull |
| 314 | functions. */ |
| 315 | fn_gnutls_transport_set_ptr2 (state, |
| 316 | (gnutls_transport_ptr_t) proc, |
| 317 | (gnutls_transport_ptr_t) proc); |
| 318 | fn_gnutls_transport_set_push_function (state, &emacs_gnutls_push); |
| 319 | fn_gnutls_transport_set_pull_function (state, &emacs_gnutls_pull); |
| 320 | |
| 321 | /* For non blocking sockets or other custom made pull/push |
| 322 | functions the gnutls_transport_set_lowat must be called, with |
| 323 | a zero low water mark value. (GnuTLS 2.10.4 documentation) |
| 324 | |
| 325 | (Note: this is probably not strictly necessary as the lowat |
| 326 | value is only used when no custom pull/push functions are |
| 327 | set.) */ |
| 328 | /* According to GnuTLS NEWS file, lowat level has been set to |
| 329 | zero by default in version 2.11.1, and the function |
| 330 | gnutls_transport_set_lowat was removed from the library in |
| 331 | version 2.99.0. */ |
| 332 | if (!fn_gnutls_check_version ("2.11.1")) |
| 333 | fn_gnutls_transport_set_lowat (state, 0); |
| 334 | #else |
| 335 | /* This is how GnuTLS takes sockets: as file descriptors passed |
| 336 | in. For an Emacs process socket, infd and outfd are the |
| 337 | same but we use this two-argument version for clarity. */ |
| 338 | fn_gnutls_transport_set_ptr2 (state, |
| 339 | (gnutls_transport_ptr_t) (long) proc->infd, |
| 340 | (gnutls_transport_ptr_t) (long) proc->outfd); |
| 341 | #endif |
| 342 | |
| 343 | proc->gnutls_initstage = GNUTLS_STAGE_TRANSPORT_POINTERS_SET; |
| 344 | } |
| 345 | |
| 346 | do |
| 347 | { |
| 348 | ret = fn_gnutls_handshake (state); |
| 349 | emacs_gnutls_handle_error (state, ret); |
| 350 | QUIT; |
| 351 | } |
| 352 | while (ret < 0 && fn_gnutls_error_is_fatal (ret) == 0); |
| 353 | |
| 354 | proc->gnutls_initstage = GNUTLS_STAGE_HANDSHAKE_TRIED; |
| 355 | |
| 356 | if (ret == GNUTLS_E_SUCCESS) |
| 357 | { |
| 358 | /* Here we're finally done. */ |
| 359 | proc->gnutls_initstage = GNUTLS_STAGE_READY; |
| 360 | } |
| 361 | else |
| 362 | { |
| 363 | fn_gnutls_alert_send_appropriate (state, ret); |
| 364 | } |
| 365 | return ret; |
| 366 | } |
| 367 | |
| 368 | ptrdiff_t |
| 369 | emacs_gnutls_record_check_pending (gnutls_session_t state) |
| 370 | { |
| 371 | return fn_gnutls_record_check_pending (state); |
| 372 | } |
| 373 | |
| 374 | #ifdef WINDOWSNT |
| 375 | void |
| 376 | emacs_gnutls_transport_set_errno (gnutls_session_t state, int err) |
| 377 | { |
| 378 | fn_gnutls_transport_set_errno (state, err); |
| 379 | } |
| 380 | #endif |
| 381 | |
| 382 | ptrdiff_t |
| 383 | emacs_gnutls_write (struct Lisp_Process *proc, const char *buf, ptrdiff_t nbyte) |
| 384 | { |
| 385 | ssize_t rtnval = 0; |
| 386 | ptrdiff_t bytes_written; |
| 387 | gnutls_session_t state = proc->gnutls_state; |
| 388 | |
| 389 | if (proc->gnutls_initstage != GNUTLS_STAGE_READY) |
| 390 | { |
| 391 | errno = EAGAIN; |
| 392 | return 0; |
| 393 | } |
| 394 | |
| 395 | bytes_written = 0; |
| 396 | |
| 397 | while (nbyte > 0) |
| 398 | { |
| 399 | rtnval = fn_gnutls_record_send (state, buf, nbyte); |
| 400 | |
| 401 | if (rtnval < 0) |
| 402 | { |
| 403 | if (rtnval == GNUTLS_E_INTERRUPTED) |
| 404 | continue; |
| 405 | else |
| 406 | { |
| 407 | /* If we get GNUTLS_E_AGAIN, then set errno |
| 408 | appropriately so that send_process retries the |
| 409 | correct way instead of erroring out. */ |
| 410 | if (rtnval == GNUTLS_E_AGAIN) |
| 411 | errno = EAGAIN; |
| 412 | break; |
| 413 | } |
| 414 | } |
| 415 | |
| 416 | buf += rtnval; |
| 417 | nbyte -= rtnval; |
| 418 | bytes_written += rtnval; |
| 419 | } |
| 420 | |
| 421 | emacs_gnutls_handle_error (state, rtnval); |
| 422 | return (bytes_written); |
| 423 | } |
| 424 | |
| 425 | ptrdiff_t |
| 426 | emacs_gnutls_read (struct Lisp_Process *proc, char *buf, ptrdiff_t nbyte) |
| 427 | { |
| 428 | ssize_t rtnval; |
| 429 | gnutls_session_t state = proc->gnutls_state; |
| 430 | |
| 431 | int log_level = proc->gnutls_log_level; |
| 432 | |
| 433 | if (proc->gnutls_initstage != GNUTLS_STAGE_READY) |
| 434 | { |
| 435 | /* If the handshake count is under the limit, try the handshake |
| 436 | again and increment the handshake count. This count is kept |
| 437 | per process (connection), not globally. */ |
| 438 | if (proc->gnutls_handshakes_tried < GNUTLS_EMACS_HANDSHAKES_LIMIT) |
| 439 | { |
| 440 | proc->gnutls_handshakes_tried++; |
| 441 | emacs_gnutls_handshake (proc); |
| 442 | GNUTLS_LOG2i (5, log_level, "Retried handshake", |
| 443 | proc->gnutls_handshakes_tried); |
| 444 | return -1; |
| 445 | } |
| 446 | |
| 447 | GNUTLS_LOG (2, log_level, "Giving up on handshake; resetting retries"); |
| 448 | proc->gnutls_handshakes_tried = 0; |
| 449 | return 0; |
| 450 | } |
| 451 | rtnval = fn_gnutls_record_recv (state, buf, nbyte); |
| 452 | if (rtnval >= 0) |
| 453 | return rtnval; |
| 454 | else if (rtnval == GNUTLS_E_UNEXPECTED_PACKET_LENGTH) |
| 455 | /* The peer closed the connection. */ |
| 456 | return 0; |
| 457 | else if (emacs_gnutls_handle_error (state, rtnval)) |
| 458 | /* non-fatal error */ |
| 459 | return -1; |
| 460 | else { |
| 461 | /* a fatal error occurred */ |
| 462 | return 0; |
| 463 | } |
| 464 | } |
| 465 | |
| 466 | /* Report a GnuTLS error to the user. |
| 467 | Return true if the error code was successfully handled. */ |
| 468 | static bool |
| 469 | emacs_gnutls_handle_error (gnutls_session_t session, int err) |
| 470 | { |
| 471 | int max_log_level = 0; |
| 472 | |
| 473 | bool ret; |
| 474 | const char *str; |
| 475 | |
| 476 | /* TODO: use a Lisp_Object generated by gnutls_make_error? */ |
| 477 | if (err >= 0) |
| 478 | return 1; |
| 479 | |
| 480 | max_log_level = global_gnutls_log_level; |
| 481 | |
| 482 | /* TODO: use gnutls-error-fatalp and gnutls-error-string. */ |
| 483 | |
| 484 | str = fn_gnutls_strerror (err); |
| 485 | if (!str) |
| 486 | str = "unknown"; |
| 487 | |
| 488 | if (fn_gnutls_error_is_fatal (err)) |
| 489 | { |
| 490 | ret = 0; |
| 491 | GNUTLS_LOG2 (0, max_log_level, "fatal error:", str); |
| 492 | } |
| 493 | else |
| 494 | { |
| 495 | ret = 1; |
| 496 | |
| 497 | switch (err) |
| 498 | { |
| 499 | case GNUTLS_E_AGAIN: |
| 500 | GNUTLS_LOG2 (3, |
| 501 | max_log_level, |
| 502 | "retry:", |
| 503 | str); |
| 504 | default: |
| 505 | GNUTLS_LOG2 (1, |
| 506 | max_log_level, |
| 507 | "non-fatal error:", |
| 508 | str); |
| 509 | } |
| 510 | } |
| 511 | |
| 512 | if (err == GNUTLS_E_WARNING_ALERT_RECEIVED |
| 513 | || err == GNUTLS_E_FATAL_ALERT_RECEIVED) |
| 514 | { |
| 515 | int alert = fn_gnutls_alert_get (session); |
| 516 | int level = (err == GNUTLS_E_FATAL_ALERT_RECEIVED) ? 0 : 1; |
| 517 | str = fn_gnutls_alert_get_name (alert); |
| 518 | if (!str) |
| 519 | str = "unknown"; |
| 520 | |
| 521 | GNUTLS_LOG2 (level, max_log_level, "Received alert: ", str); |
| 522 | } |
| 523 | return ret; |
| 524 | } |
| 525 | |
| 526 | /* convert an integer error to a Lisp_Object; it will be either a |
| 527 | known symbol like `gnutls_e_interrupted' and `gnutls_e_again' or |
| 528 | simply the integer value of the error. GNUTLS_E_SUCCESS is mapped |
| 529 | to Qt. */ |
| 530 | static Lisp_Object |
| 531 | gnutls_make_error (int err) |
| 532 | { |
| 533 | switch (err) |
| 534 | { |
| 535 | case GNUTLS_E_SUCCESS: |
| 536 | return Qt; |
| 537 | case GNUTLS_E_AGAIN: |
| 538 | return Qgnutls_e_again; |
| 539 | case GNUTLS_E_INTERRUPTED: |
| 540 | return Qgnutls_e_interrupted; |
| 541 | case GNUTLS_E_INVALID_SESSION: |
| 542 | return Qgnutls_e_invalid_session; |
| 543 | } |
| 544 | |
| 545 | return make_number (err); |
| 546 | } |
| 547 | |
| 548 | Lisp_Object |
| 549 | emacs_gnutls_deinit (Lisp_Object proc) |
| 550 | { |
| 551 | int log_level; |
| 552 | |
| 553 | CHECK_PROCESS (proc); |
| 554 | |
| 555 | if (XPROCESS (proc)->gnutls_p == 0) |
| 556 | return Qnil; |
| 557 | |
| 558 | log_level = XPROCESS (proc)->gnutls_log_level; |
| 559 | |
| 560 | if (XPROCESS (proc)->gnutls_x509_cred) |
| 561 | { |
| 562 | GNUTLS_LOG (2, log_level, "Deallocating x509 credentials"); |
| 563 | fn_gnutls_certificate_free_credentials (XPROCESS (proc)->gnutls_x509_cred); |
| 564 | XPROCESS (proc)->gnutls_x509_cred = NULL; |
| 565 | } |
| 566 | |
| 567 | if (XPROCESS (proc)->gnutls_anon_cred) |
| 568 | { |
| 569 | GNUTLS_LOG (2, log_level, "Deallocating anon credentials"); |
| 570 | fn_gnutls_anon_free_client_credentials (XPROCESS (proc)->gnutls_anon_cred); |
| 571 | XPROCESS (proc)->gnutls_anon_cred = NULL; |
| 572 | } |
| 573 | |
| 574 | if (XPROCESS (proc)->gnutls_state) |
| 575 | { |
| 576 | fn_gnutls_deinit (XPROCESS (proc)->gnutls_state); |
| 577 | XPROCESS (proc)->gnutls_state = NULL; |
| 578 | if (GNUTLS_INITSTAGE (proc) >= GNUTLS_STAGE_INIT) |
| 579 | GNUTLS_INITSTAGE (proc) = GNUTLS_STAGE_INIT - 1; |
| 580 | } |
| 581 | |
| 582 | XPROCESS (proc)->gnutls_p = 0; |
| 583 | return Qt; |
| 584 | } |
| 585 | |
| 586 | DEFUN ("gnutls-get-initstage", Fgnutls_get_initstage, Sgnutls_get_initstage, 1, 1, 0, |
| 587 | doc: /* Return the GnuTLS init stage of process PROC. |
| 588 | See also `gnutls-boot'. */) |
| 589 | (Lisp_Object proc) |
| 590 | { |
| 591 | CHECK_PROCESS (proc); |
| 592 | |
| 593 | return make_number (GNUTLS_INITSTAGE (proc)); |
| 594 | } |
| 595 | |
| 596 | DEFUN ("gnutls-errorp", Fgnutls_errorp, Sgnutls_errorp, 1, 1, 0, |
| 597 | doc: /* Return t if ERROR indicates a GnuTLS problem. |
| 598 | ERROR is an integer or a symbol with an integer `gnutls-code' property. |
| 599 | usage: (gnutls-errorp ERROR) */) |
| 600 | (Lisp_Object err) |
| 601 | { |
| 602 | if (EQ (err, Qt)) return Qnil; |
| 603 | |
| 604 | return Qt; |
| 605 | } |
| 606 | |
| 607 | DEFUN ("gnutls-error-fatalp", Fgnutls_error_fatalp, Sgnutls_error_fatalp, 1, 1, 0, |
| 608 | doc: /* Check if ERROR is fatal. |
| 609 | ERROR is an integer or a symbol with an integer `gnutls-code' property. |
| 610 | usage: (gnutls-error-fatalp ERROR) */) |
| 611 | (Lisp_Object err) |
| 612 | { |
| 613 | Lisp_Object code; |
| 614 | |
| 615 | if (EQ (err, Qt)) return Qnil; |
| 616 | |
| 617 | if (SYMBOLP (err)) |
| 618 | { |
| 619 | code = Fget (err, Qgnutls_code); |
| 620 | if (NUMBERP (code)) |
| 621 | { |
| 622 | err = code; |
| 623 | } |
| 624 | else |
| 625 | { |
| 626 | error ("Symbol has no numeric gnutls-code property"); |
| 627 | } |
| 628 | } |
| 629 | |
| 630 | if (! TYPE_RANGED_INTEGERP (int, err)) |
| 631 | error ("Not an error symbol or code"); |
| 632 | |
| 633 | if (0 == fn_gnutls_error_is_fatal (XINT (err))) |
| 634 | return Qnil; |
| 635 | |
| 636 | return Qt; |
| 637 | } |
| 638 | |
| 639 | DEFUN ("gnutls-error-string", Fgnutls_error_string, Sgnutls_error_string, 1, 1, 0, |
| 640 | doc: /* Return a description of ERROR. |
| 641 | ERROR is an integer or a symbol with an integer `gnutls-code' property. |
| 642 | usage: (gnutls-error-string ERROR) */) |
| 643 | (Lisp_Object err) |
| 644 | { |
| 645 | Lisp_Object code; |
| 646 | |
| 647 | if (EQ (err, Qt)) return build_string ("Not an error"); |
| 648 | |
| 649 | if (SYMBOLP (err)) |
| 650 | { |
| 651 | code = Fget (err, Qgnutls_code); |
| 652 | if (NUMBERP (code)) |
| 653 | { |
| 654 | err = code; |
| 655 | } |
| 656 | else |
| 657 | { |
| 658 | return build_string ("Symbol has no numeric gnutls-code property"); |
| 659 | } |
| 660 | } |
| 661 | |
| 662 | if (! TYPE_RANGED_INTEGERP (int, err)) |
| 663 | return build_string ("Not an error symbol or code"); |
| 664 | |
| 665 | return build_string (fn_gnutls_strerror (XINT (err))); |
| 666 | } |
| 667 | |
| 668 | DEFUN ("gnutls-deinit", Fgnutls_deinit, Sgnutls_deinit, 1, 1, 0, |
| 669 | doc: /* Deallocate GnuTLS resources associated with process PROC. |
| 670 | See also `gnutls-init'. */) |
| 671 | (Lisp_Object proc) |
| 672 | { |
| 673 | return emacs_gnutls_deinit (proc); |
| 674 | } |
| 675 | |
| 676 | DEFUN ("gnutls-available-p", Fgnutls_available_p, Sgnutls_available_p, 0, 0, 0, |
| 677 | doc: /* Return t if GnuTLS is available in this instance of Emacs. */) |
| 678 | (void) |
| 679 | { |
| 680 | #ifdef WINDOWSNT |
| 681 | Lisp_Object found = Fassq (Qgnutls_dll, Vlibrary_cache); |
| 682 | if (CONSP (found)) |
| 683 | return XCDR (found); |
| 684 | else |
| 685 | { |
| 686 | Lisp_Object status; |
| 687 | status = init_gnutls_functions () ? Qt : Qnil; |
| 688 | Vlibrary_cache = Fcons (Fcons (Qgnutls_dll, status), Vlibrary_cache); |
| 689 | return status; |
| 690 | } |
| 691 | #else |
| 692 | return Qt; |
| 693 | #endif |
| 694 | } |
| 695 | |
| 696 | |
| 697 | /* Initializes global GnuTLS state to defaults. |
| 698 | Call `gnutls-global-deinit' when GnuTLS usage is no longer needed. |
| 699 | Returns zero on success. */ |
| 700 | static Lisp_Object |
| 701 | emacs_gnutls_global_init (void) |
| 702 | { |
| 703 | int ret = GNUTLS_E_SUCCESS; |
| 704 | |
| 705 | if (!gnutls_global_initialized) |
| 706 | { |
| 707 | fn_gnutls_global_set_mem_functions (xmalloc, xmalloc, NULL, |
| 708 | xrealloc, xfree); |
| 709 | ret = fn_gnutls_global_init (); |
| 710 | } |
| 711 | gnutls_global_initialized = 1; |
| 712 | |
| 713 | return gnutls_make_error (ret); |
| 714 | } |
| 715 | |
| 716 | #if 0 |
| 717 | /* Deinitializes global GnuTLS state. |
| 718 | See also `gnutls-global-init'. */ |
| 719 | static Lisp_Object |
| 720 | emacs_gnutls_global_deinit (void) |
| 721 | { |
| 722 | if (gnutls_global_initialized) |
| 723 | gnutls_global_deinit (); |
| 724 | |
| 725 | gnutls_global_initialized = 0; |
| 726 | |
| 727 | return gnutls_make_error (GNUTLS_E_SUCCESS); |
| 728 | } |
| 729 | #endif |
| 730 | |
| 731 | DEFUN ("gnutls-boot", Fgnutls_boot, Sgnutls_boot, 3, 3, 0, |
| 732 | doc: /* Initialize GnuTLS client for process PROC with TYPE+PROPLIST. |
| 733 | Currently only client mode is supported. Return a success/failure |
| 734 | value you can check with `gnutls-errorp'. |
| 735 | |
| 736 | TYPE is a symbol, either `gnutls-anon' or `gnutls-x509pki'. |
| 737 | PROPLIST is a property list with the following keys: |
| 738 | |
| 739 | :hostname is a string naming the remote host. |
| 740 | |
| 741 | :priority is a GnuTLS priority string, defaults to "NORMAL". |
| 742 | |
| 743 | :trustfiles is a list of PEM-encoded trust files for `gnutls-x509pki'. |
| 744 | |
| 745 | :crlfiles is a list of PEM-encoded CRL lists for `gnutls-x509pki'. |
| 746 | |
| 747 | :keylist is an alist of PEM-encoded key files and PEM-encoded |
| 748 | certificates for `gnutls-x509pki'. |
| 749 | |
| 750 | :callbacks is an alist of callback functions, see below. |
| 751 | |
| 752 | :loglevel is the debug level requested from GnuTLS, try 4. |
| 753 | |
| 754 | :verify-flags is a bitset as per GnuTLS' |
| 755 | gnutls_certificate_set_verify_flags. |
| 756 | |
| 757 | :verify-hostname-error is ignored. Pass :hostname in :verify-error |
| 758 | instead. |
| 759 | |
| 760 | :verify-error is a list of symbols to express verification checks or |
| 761 | `t' to do all checks. Currently it can contain `:trustfiles' and |
| 762 | `:hostname' to verify the certificate or the hostname respectively. |
| 763 | |
| 764 | :min-prime-bits is the minimum accepted number of bits the client will |
| 765 | accept in Diffie-Hellman key exchange. |
| 766 | |
| 767 | The debug level will be set for this process AND globally for GnuTLS. |
| 768 | So if you set it higher or lower at any point, it affects global |
| 769 | debugging. |
| 770 | |
| 771 | Note that the priority is set on the client. The server does not use |
| 772 | the protocols's priority except for disabling protocols that were not |
| 773 | specified. |
| 774 | |
| 775 | Processes must be initialized with this function before other GnuTLS |
| 776 | functions are used. This function allocates resources which can only |
| 777 | be deallocated by calling `gnutls-deinit' or by calling it again. |
| 778 | |
| 779 | The callbacks alist can have a `verify' key, associated with a |
| 780 | verification function (UNUSED). |
| 781 | |
| 782 | Each authentication type may need additional information in order to |
| 783 | work. For X.509 PKI (`gnutls-x509pki'), you probably need at least |
| 784 | one trustfile (usually a CA bundle). */) |
| 785 | (Lisp_Object proc, Lisp_Object type, Lisp_Object proplist) |
| 786 | { |
| 787 | int ret = GNUTLS_E_SUCCESS; |
| 788 | int max_log_level = 0; |
| 789 | bool verify_error_all = 0; |
| 790 | |
| 791 | gnutls_session_t state; |
| 792 | gnutls_certificate_credentials_t x509_cred = NULL; |
| 793 | gnutls_anon_client_credentials_t anon_cred = NULL; |
| 794 | Lisp_Object global_init; |
| 795 | char const *priority_string_ptr = "NORMAL"; /* default priority string. */ |
| 796 | unsigned int peer_verification; |
| 797 | char *c_hostname; |
| 798 | |
| 799 | /* Placeholders for the property list elements. */ |
| 800 | Lisp_Object priority_string; |
| 801 | Lisp_Object trustfiles; |
| 802 | Lisp_Object crlfiles; |
| 803 | Lisp_Object keylist; |
| 804 | /* Lisp_Object callbacks; */ |
| 805 | Lisp_Object loglevel; |
| 806 | Lisp_Object hostname; |
| 807 | Lisp_Object verify_error; |
| 808 | Lisp_Object prime_bits; |
| 809 | |
| 810 | CHECK_PROCESS (proc); |
| 811 | CHECK_SYMBOL (type); |
| 812 | CHECK_LIST (proplist); |
| 813 | |
| 814 | if (NILP (Fgnutls_available_p ())) |
| 815 | error ("GnuTLS not available"); |
| 816 | |
| 817 | if (!EQ (type, Qgnutls_x509pki) && !EQ (type, Qgnutls_anon)) |
| 818 | error ("Invalid GnuTLS credential type"); |
| 819 | |
| 820 | hostname = Fplist_get (proplist, QCgnutls_bootprop_hostname); |
| 821 | priority_string = Fplist_get (proplist, QCgnutls_bootprop_priority); |
| 822 | trustfiles = Fplist_get (proplist, QCgnutls_bootprop_trustfiles); |
| 823 | keylist = Fplist_get (proplist, QCgnutls_bootprop_keylist); |
| 824 | crlfiles = Fplist_get (proplist, QCgnutls_bootprop_crlfiles); |
| 825 | loglevel = Fplist_get (proplist, QCgnutls_bootprop_loglevel); |
| 826 | verify_error = Fplist_get (proplist, QCgnutls_bootprop_verify_error); |
| 827 | prime_bits = Fplist_get (proplist, QCgnutls_bootprop_min_prime_bits); |
| 828 | |
| 829 | if (EQ (verify_error, Qt)) |
| 830 | { |
| 831 | verify_error_all = 1; |
| 832 | } |
| 833 | else if (NILP (Flistp (verify_error))) |
| 834 | { |
| 835 | error ("gnutls-boot: invalid :verify_error parameter (not a list)"); |
| 836 | } |
| 837 | |
| 838 | if (!STRINGP (hostname)) |
| 839 | error ("gnutls-boot: invalid :hostname parameter (not a string)"); |
| 840 | c_hostname = SSDATA (hostname); |
| 841 | |
| 842 | state = XPROCESS (proc)->gnutls_state; |
| 843 | |
| 844 | if (TYPE_RANGED_INTEGERP (int, loglevel)) |
| 845 | { |
| 846 | fn_gnutls_global_set_log_function (gnutls_log_function); |
| 847 | #ifdef HAVE_GNUTLS3 |
| 848 | fn_gnutls_global_set_audit_log_function (gnutls_audit_log_function); |
| 849 | #endif |
| 850 | fn_gnutls_global_set_log_level (XINT (loglevel)); |
| 851 | max_log_level = XINT (loglevel); |
| 852 | XPROCESS (proc)->gnutls_log_level = max_log_level; |
| 853 | } |
| 854 | |
| 855 | /* always initialize globals. */ |
| 856 | global_init = emacs_gnutls_global_init (); |
| 857 | if (! NILP (Fgnutls_errorp (global_init))) |
| 858 | return global_init; |
| 859 | |
| 860 | /* Before allocating new credentials, deallocate any credentials |
| 861 | that PROC might already have. */ |
| 862 | emacs_gnutls_deinit (proc); |
| 863 | |
| 864 | /* Mark PROC as a GnuTLS process. */ |
| 865 | XPROCESS (proc)->gnutls_state = NULL; |
| 866 | XPROCESS (proc)->gnutls_x509_cred = NULL; |
| 867 | XPROCESS (proc)->gnutls_anon_cred = NULL; |
| 868 | pset_gnutls_cred_type (XPROCESS (proc), type); |
| 869 | GNUTLS_INITSTAGE (proc) = GNUTLS_STAGE_EMPTY; |
| 870 | |
| 871 | GNUTLS_LOG (1, max_log_level, "allocating credentials"); |
| 872 | if (EQ (type, Qgnutls_x509pki)) |
| 873 | { |
| 874 | Lisp_Object verify_flags; |
| 875 | unsigned int gnutls_verify_flags = GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT; |
| 876 | |
| 877 | GNUTLS_LOG (2, max_log_level, "allocating x509 credentials"); |
| 878 | fn_gnutls_certificate_allocate_credentials (&x509_cred); |
| 879 | XPROCESS (proc)->gnutls_x509_cred = x509_cred; |
| 880 | |
| 881 | verify_flags = Fplist_get (proplist, QCgnutls_bootprop_verify_flags); |
| 882 | if (NUMBERP (verify_flags)) |
| 883 | { |
| 884 | gnutls_verify_flags = XINT (verify_flags); |
| 885 | GNUTLS_LOG (2, max_log_level, "setting verification flags"); |
| 886 | } |
| 887 | else if (NILP (verify_flags)) |
| 888 | GNUTLS_LOG (2, max_log_level, "using default verification flags"); |
| 889 | else |
| 890 | GNUTLS_LOG (2, max_log_level, "ignoring invalid verify-flags"); |
| 891 | |
| 892 | fn_gnutls_certificate_set_verify_flags (x509_cred, gnutls_verify_flags); |
| 893 | } |
| 894 | else /* Qgnutls_anon: */ |
| 895 | { |
| 896 | GNUTLS_LOG (2, max_log_level, "allocating anon credentials"); |
| 897 | fn_gnutls_anon_allocate_client_credentials (&anon_cred); |
| 898 | XPROCESS (proc)->gnutls_anon_cred = anon_cred; |
| 899 | } |
| 900 | |
| 901 | GNUTLS_INITSTAGE (proc) = GNUTLS_STAGE_CRED_ALLOC; |
| 902 | |
| 903 | if (EQ (type, Qgnutls_x509pki)) |
| 904 | { |
| 905 | /* TODO: GNUTLS_X509_FMT_DER is also an option. */ |
| 906 | int file_format = GNUTLS_X509_FMT_PEM; |
| 907 | Lisp_Object tail; |
| 908 | |
| 909 | for (tail = trustfiles; CONSP (tail); tail = XCDR (tail)) |
| 910 | { |
| 911 | Lisp_Object trustfile = XCAR (tail); |
| 912 | if (STRINGP (trustfile)) |
| 913 | { |
| 914 | GNUTLS_LOG2 (1, max_log_level, "setting the trustfile: ", |
| 915 | SSDATA (trustfile)); |
| 916 | trustfile = ENCODE_FILE (trustfile); |
| 917 | #ifdef WINDOWSNT |
| 918 | /* Since GnuTLS doesn't support UTF-8 or UTF-16 encoded |
| 919 | file names on Windows, we need to re-encode the file |
| 920 | name using the current ANSI codepage. */ |
| 921 | trustfile = ansi_encode_filename (trustfile); |
| 922 | #endif |
| 923 | ret = fn_gnutls_certificate_set_x509_trust_file |
| 924 | (x509_cred, |
| 925 | SSDATA (trustfile), |
| 926 | file_format); |
| 927 | |
| 928 | if (ret < GNUTLS_E_SUCCESS) |
| 929 | return gnutls_make_error (ret); |
| 930 | } |
| 931 | else |
| 932 | { |
| 933 | emacs_gnutls_deinit (proc); |
| 934 | error ("Invalid trustfile"); |
| 935 | } |
| 936 | } |
| 937 | |
| 938 | for (tail = crlfiles; CONSP (tail); tail = XCDR (tail)) |
| 939 | { |
| 940 | Lisp_Object crlfile = XCAR (tail); |
| 941 | if (STRINGP (crlfile)) |
| 942 | { |
| 943 | GNUTLS_LOG2 (1, max_log_level, "setting the CRL file: ", |
| 944 | SSDATA (crlfile)); |
| 945 | crlfile = ENCODE_FILE (crlfile); |
| 946 | #ifdef WINDOWSNT |
| 947 | crlfile = ansi_encode_filename (crlfile); |
| 948 | #endif |
| 949 | ret = fn_gnutls_certificate_set_x509_crl_file |
| 950 | (x509_cred, SSDATA (crlfile), file_format); |
| 951 | |
| 952 | if (ret < GNUTLS_E_SUCCESS) |
| 953 | return gnutls_make_error (ret); |
| 954 | } |
| 955 | else |
| 956 | { |
| 957 | emacs_gnutls_deinit (proc); |
| 958 | error ("Invalid CRL file"); |
| 959 | } |
| 960 | } |
| 961 | |
| 962 | for (tail = keylist; CONSP (tail); tail = XCDR (tail)) |
| 963 | { |
| 964 | Lisp_Object keyfile = Fcar (XCAR (tail)); |
| 965 | Lisp_Object certfile = Fcar (Fcdr (XCAR (tail))); |
| 966 | if (STRINGP (keyfile) && STRINGP (certfile)) |
| 967 | { |
| 968 | GNUTLS_LOG2 (1, max_log_level, "setting the client key file: ", |
| 969 | SSDATA (keyfile)); |
| 970 | GNUTLS_LOG2 (1, max_log_level, "setting the client cert file: ", |
| 971 | SSDATA (certfile)); |
| 972 | keyfile = ENCODE_FILE (keyfile); |
| 973 | certfile = ENCODE_FILE (certfile); |
| 974 | #ifdef WINDOWSNT |
| 975 | keyfile = ansi_encode_filename (keyfile); |
| 976 | certfile = ansi_encode_filename (certfile); |
| 977 | #endif |
| 978 | ret = fn_gnutls_certificate_set_x509_key_file |
| 979 | (x509_cred, SSDATA (certfile), SSDATA (keyfile), file_format); |
| 980 | |
| 981 | if (ret < GNUTLS_E_SUCCESS) |
| 982 | return gnutls_make_error (ret); |
| 983 | } |
| 984 | else |
| 985 | { |
| 986 | emacs_gnutls_deinit (proc); |
| 987 | error (STRINGP (keyfile) ? "Invalid client cert file" |
| 988 | : "Invalid client key file"); |
| 989 | } |
| 990 | } |
| 991 | } |
| 992 | |
| 993 | GNUTLS_INITSTAGE (proc) = GNUTLS_STAGE_FILES; |
| 994 | GNUTLS_LOG (1, max_log_level, "gnutls callbacks"); |
| 995 | GNUTLS_INITSTAGE (proc) = GNUTLS_STAGE_CALLBACKS; |
| 996 | |
| 997 | /* Call gnutls_init here: */ |
| 998 | |
| 999 | GNUTLS_LOG (1, max_log_level, "gnutls_init"); |
| 1000 | ret = fn_gnutls_init (&state, GNUTLS_CLIENT); |
| 1001 | XPROCESS (proc)->gnutls_state = state; |
| 1002 | if (ret < GNUTLS_E_SUCCESS) |
| 1003 | return gnutls_make_error (ret); |
| 1004 | GNUTLS_INITSTAGE (proc) = GNUTLS_STAGE_INIT; |
| 1005 | |
| 1006 | if (STRINGP (priority_string)) |
| 1007 | { |
| 1008 | priority_string_ptr = SSDATA (priority_string); |
| 1009 | GNUTLS_LOG2 (1, max_log_level, "got non-default priority string:", |
| 1010 | priority_string_ptr); |
| 1011 | } |
| 1012 | else |
| 1013 | { |
| 1014 | GNUTLS_LOG2 (1, max_log_level, "using default priority string:", |
| 1015 | priority_string_ptr); |
| 1016 | } |
| 1017 | |
| 1018 | GNUTLS_LOG (1, max_log_level, "setting the priority string"); |
| 1019 | ret = fn_gnutls_priority_set_direct (state, |
| 1020 | priority_string_ptr, |
| 1021 | NULL); |
| 1022 | if (ret < GNUTLS_E_SUCCESS) |
| 1023 | return gnutls_make_error (ret); |
| 1024 | |
| 1025 | GNUTLS_INITSTAGE (proc) = GNUTLS_STAGE_PRIORITY; |
| 1026 | |
| 1027 | if (INTEGERP (prime_bits)) |
| 1028 | fn_gnutls_dh_set_prime_bits (state, XUINT (prime_bits)); |
| 1029 | |
| 1030 | ret = EQ (type, Qgnutls_x509pki) |
| 1031 | ? fn_gnutls_credentials_set (state, GNUTLS_CRD_CERTIFICATE, x509_cred) |
| 1032 | : fn_gnutls_credentials_set (state, GNUTLS_CRD_ANON, anon_cred); |
| 1033 | if (ret < GNUTLS_E_SUCCESS) |
| 1034 | return gnutls_make_error (ret); |
| 1035 | |
| 1036 | GNUTLS_INITSTAGE (proc) = GNUTLS_STAGE_CRED_SET; |
| 1037 | ret = emacs_gnutls_handshake (XPROCESS (proc)); |
| 1038 | if (ret < GNUTLS_E_SUCCESS) |
| 1039 | return gnutls_make_error (ret); |
| 1040 | |
| 1041 | /* Now verify the peer, following |
| 1042 | http://www.gnu.org/software/gnutls/manual/html_node/Verifying-peer_0027s-certificate.html. |
| 1043 | The peer should present at least one certificate in the chain; do a |
| 1044 | check of the certificate's hostname with |
| 1045 | gnutls_x509_crt_check_hostname() against :hostname. */ |
| 1046 | |
| 1047 | ret = fn_gnutls_certificate_verify_peers2 (state, &peer_verification); |
| 1048 | if (ret < GNUTLS_E_SUCCESS) |
| 1049 | return gnutls_make_error (ret); |
| 1050 | |
| 1051 | if (XINT (loglevel) > 0 && peer_verification & GNUTLS_CERT_INVALID) |
| 1052 | message ("%s certificate could not be verified.", c_hostname); |
| 1053 | |
| 1054 | if (peer_verification & GNUTLS_CERT_REVOKED) |
| 1055 | GNUTLS_LOG2 (1, max_log_level, "certificate was revoked (CRL):", |
| 1056 | c_hostname); |
| 1057 | |
| 1058 | if (peer_verification & GNUTLS_CERT_SIGNER_NOT_FOUND) |
| 1059 | GNUTLS_LOG2 (1, max_log_level, "certificate signer was not found:", |
| 1060 | c_hostname); |
| 1061 | |
| 1062 | if (peer_verification & GNUTLS_CERT_SIGNER_NOT_CA) |
| 1063 | GNUTLS_LOG2 (1, max_log_level, "certificate signer is not a CA:", |
| 1064 | c_hostname); |
| 1065 | |
| 1066 | if (peer_verification & GNUTLS_CERT_INSECURE_ALGORITHM) |
| 1067 | GNUTLS_LOG2 (1, max_log_level, |
| 1068 | "certificate was signed with an insecure algorithm:", |
| 1069 | c_hostname); |
| 1070 | |
| 1071 | if (peer_verification & GNUTLS_CERT_NOT_ACTIVATED) |
| 1072 | GNUTLS_LOG2 (1, max_log_level, "certificate is not yet activated:", |
| 1073 | c_hostname); |
| 1074 | |
| 1075 | if (peer_verification & GNUTLS_CERT_EXPIRED) |
| 1076 | GNUTLS_LOG2 (1, max_log_level, "certificate has expired:", |
| 1077 | c_hostname); |
| 1078 | |
| 1079 | if (peer_verification != 0) |
| 1080 | { |
| 1081 | if (verify_error_all |
| 1082 | || !NILP (Fmember (QCgnutls_bootprop_trustfiles, verify_error))) |
| 1083 | { |
| 1084 | emacs_gnutls_deinit (proc); |
| 1085 | error ("Certificate validation failed %s, verification code %d", |
| 1086 | c_hostname, peer_verification); |
| 1087 | } |
| 1088 | else |
| 1089 | { |
| 1090 | GNUTLS_LOG2 (1, max_log_level, "certificate validation failed:", |
| 1091 | c_hostname); |
| 1092 | } |
| 1093 | } |
| 1094 | |
| 1095 | /* Up to here the process is the same for X.509 certificates and |
| 1096 | OpenPGP keys. From now on X.509 certificates are assumed. This |
| 1097 | can be easily extended to work with openpgp keys as well. */ |
| 1098 | if (fn_gnutls_certificate_type_get (state) == GNUTLS_CRT_X509) |
| 1099 | { |
| 1100 | gnutls_x509_crt_t gnutls_verify_cert; |
| 1101 | const gnutls_datum_t *gnutls_verify_cert_list; |
| 1102 | unsigned int gnutls_verify_cert_list_size; |
| 1103 | |
| 1104 | ret = fn_gnutls_x509_crt_init (&gnutls_verify_cert); |
| 1105 | if (ret < GNUTLS_E_SUCCESS) |
| 1106 | return gnutls_make_error (ret); |
| 1107 | |
| 1108 | gnutls_verify_cert_list = |
| 1109 | fn_gnutls_certificate_get_peers (state, &gnutls_verify_cert_list_size); |
| 1110 | |
| 1111 | if (gnutls_verify_cert_list == NULL) |
| 1112 | { |
| 1113 | fn_gnutls_x509_crt_deinit (gnutls_verify_cert); |
| 1114 | emacs_gnutls_deinit (proc); |
| 1115 | error ("No x509 certificate was found\n"); |
| 1116 | } |
| 1117 | |
| 1118 | /* We only check the first certificate in the given chain. */ |
| 1119 | ret = fn_gnutls_x509_crt_import (gnutls_verify_cert, |
| 1120 | &gnutls_verify_cert_list[0], |
| 1121 | GNUTLS_X509_FMT_DER); |
| 1122 | |
| 1123 | if (ret < GNUTLS_E_SUCCESS) |
| 1124 | { |
| 1125 | fn_gnutls_x509_crt_deinit (gnutls_verify_cert); |
| 1126 | return gnutls_make_error (ret); |
| 1127 | } |
| 1128 | |
| 1129 | if (!fn_gnutls_x509_crt_check_hostname (gnutls_verify_cert, c_hostname)) |
| 1130 | { |
| 1131 | if (verify_error_all |
| 1132 | || !NILP (Fmember (QCgnutls_bootprop_hostname, verify_error))) |
| 1133 | { |
| 1134 | fn_gnutls_x509_crt_deinit (gnutls_verify_cert); |
| 1135 | emacs_gnutls_deinit (proc); |
| 1136 | error ("The x509 certificate does not match \"%s\"", c_hostname); |
| 1137 | } |
| 1138 | else |
| 1139 | { |
| 1140 | GNUTLS_LOG2 (1, max_log_level, "x509 certificate does not match:", |
| 1141 | c_hostname); |
| 1142 | } |
| 1143 | } |
| 1144 | fn_gnutls_x509_crt_deinit (gnutls_verify_cert); |
| 1145 | } |
| 1146 | |
| 1147 | /* Set this flag only if the whole initialization succeeded. */ |
| 1148 | XPROCESS (proc)->gnutls_p = 1; |
| 1149 | |
| 1150 | return gnutls_make_error (ret); |
| 1151 | } |
| 1152 | |
| 1153 | DEFUN ("gnutls-bye", Fgnutls_bye, |
| 1154 | Sgnutls_bye, 2, 2, 0, |
| 1155 | doc: /* Terminate current GnuTLS connection for process PROC. |
| 1156 | The connection should have been initiated using `gnutls-handshake'. |
| 1157 | |
| 1158 | If CONT is not nil the TLS connection gets terminated and further |
| 1159 | receives and sends will be disallowed. If the return value is zero you |
| 1160 | may continue using the connection. If CONT is nil, GnuTLS actually |
| 1161 | sends an alert containing a close request and waits for the peer to |
| 1162 | reply with the same message. In order to reuse the connection you |
| 1163 | should wait for an EOF from the peer. |
| 1164 | |
| 1165 | This function may also return `gnutls-e-again', or |
| 1166 | `gnutls-e-interrupted'. */) |
| 1167 | (Lisp_Object proc, Lisp_Object cont) |
| 1168 | { |
| 1169 | gnutls_session_t state; |
| 1170 | int ret; |
| 1171 | |
| 1172 | CHECK_PROCESS (proc); |
| 1173 | |
| 1174 | state = XPROCESS (proc)->gnutls_state; |
| 1175 | |
| 1176 | ret = fn_gnutls_bye (state, |
| 1177 | NILP (cont) ? GNUTLS_SHUT_RDWR : GNUTLS_SHUT_WR); |
| 1178 | |
| 1179 | return gnutls_make_error (ret); |
| 1180 | } |
| 1181 | |
| 1182 | void |
| 1183 | syms_of_gnutls (void) |
| 1184 | { |
| 1185 | #include "gnutls.x" |
| 1186 | |
| 1187 | gnutls_global_initialized = 0; |
| 1188 | |
| 1189 | DEFSYM (Qgnutls_dll, "gnutls"); |
| 1190 | DEFSYM (Qgnutls_code, "gnutls-code"); |
| 1191 | DEFSYM (Qgnutls_anon, "gnutls-anon"); |
| 1192 | DEFSYM (Qgnutls_x509pki, "gnutls-x509pki"); |
| 1193 | DEFSYM (QCgnutls_bootprop_hostname, ":hostname"); |
| 1194 | DEFSYM (QCgnutls_bootprop_priority, ":priority"); |
| 1195 | DEFSYM (QCgnutls_bootprop_trustfiles, ":trustfiles"); |
| 1196 | DEFSYM (QCgnutls_bootprop_keylist, ":keylist"); |
| 1197 | DEFSYM (QCgnutls_bootprop_crlfiles, ":crlfiles"); |
| 1198 | DEFSYM (QCgnutls_bootprop_callbacks, ":callbacks"); |
| 1199 | DEFSYM (QCgnutls_bootprop_callbacks_verify, "verify"); |
| 1200 | DEFSYM (QCgnutls_bootprop_min_prime_bits, ":min-prime-bits"); |
| 1201 | DEFSYM (QCgnutls_bootprop_loglevel, ":loglevel"); |
| 1202 | DEFSYM (QCgnutls_bootprop_verify_flags, ":verify-flags"); |
| 1203 | DEFSYM (QCgnutls_bootprop_verify_error, ":verify-error"); |
| 1204 | |
| 1205 | DEFSYM (Qgnutls_e_interrupted, "gnutls-e-interrupted"); |
| 1206 | Fput (Qgnutls_e_interrupted, Qgnutls_code, |
| 1207 | make_number (GNUTLS_E_INTERRUPTED)); |
| 1208 | |
| 1209 | DEFSYM (Qgnutls_e_again, "gnutls-e-again"); |
| 1210 | Fput (Qgnutls_e_again, Qgnutls_code, |
| 1211 | make_number (GNUTLS_E_AGAIN)); |
| 1212 | |
| 1213 | DEFSYM (Qgnutls_e_invalid_session, "gnutls-e-invalid-session"); |
| 1214 | Fput (Qgnutls_e_invalid_session, Qgnutls_code, |
| 1215 | make_number (GNUTLS_E_INVALID_SESSION)); |
| 1216 | |
| 1217 | DEFSYM (Qgnutls_e_not_ready_for_handshake, "gnutls-e-not-ready-for-handshake"); |
| 1218 | Fput (Qgnutls_e_not_ready_for_handshake, Qgnutls_code, |
| 1219 | make_number (GNUTLS_E_APPLICATION_ERROR_MIN)); |
| 1220 | |
| 1221 | DEFVAR_INT ("gnutls-log-level", global_gnutls_log_level, |
| 1222 | doc: /* Logging level used by the GnuTLS functions. |
| 1223 | Set this larger than 0 to get debug output in the *Messages* buffer. |
| 1224 | 1 is for important messages, 2 is for debug data, and higher numbers |
| 1225 | are as per the GnuTLS logging conventions. */); |
| 1226 | global_gnutls_log_level = 0; |
| 1227 | } |
| 1228 | |
| 1229 | #endif /* HAVE_GNUTLS */ |