crypto/trace.c

   1 /*
   2  * Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include <string.h>
  12
  13 #include <openssl/bio.h>
  14 #include <openssl/crypto.h>
  15 #include <openssl/trace.h>
  16 #include "internal/bio.h"
  17 #include "internal/nelem.h"
  18 #include "internal/cryptlib_int.h"
  19
  20 #include "e_os.h"                /* strcasecmp for Windows */
  21
  22 #ifndef OPENSSL_NO_TRACE
  23
  24 static CRYPTO_RWLOCK *trace_lock = NULL;
  25
  26 static const BIO  *current_channel = NULL;
  27
  28 /*-
  29  * INTERNAL TRACE CHANNEL IMPLEMENTATION
  30  *
  31  * For our own flexibility, all trace categories are associated with a
  32  * BIO sink object, also called the trace channel. Instead of a BIO object,
  33  * the application can also provide a callback function, in which case an
  34  * internal trace channel is attached, which simply calls the registered
  35  * callback function.
  36  */
  37 static int trace_write(BIO *b, const char *buf,
  38                                size_t num, size_t *written);
  39 static int trace_puts(BIO *b, const char *str);
  40 static long trace_ctrl(BIO *channel, int cmd, long argl, void *argp);
  41 static int trace_free(BIO *b);
  42
  43 static const BIO_METHOD trace_method = {
  44     BIO_TYPE_SOURCE_SINK,
  45     "trace",
  46     trace_write,
  47     NULL,                        /* old write */
  48     NULL,                        /* read_ex */
  49     NULL,                        /* read */
  50     trace_puts,
  51     NULL,                        /* gets */
  52     trace_ctrl,                  /* ctrl */
  53     NULL,                        /* create */
  54     trace_free,                  /* free */
  55     NULL,                        /* callback_ctrl */
  56 };
  57
  58 struct trace_data_st {
  59     OSSL_trace_cb callback;
  60     int category;
  61     void *data;
  62 };
  63
  64 static int trace_write(BIO *channel,
  65                        const char *buf, size_t num, size_t *written)
  66 {
  67     struct trace_data_st *ctx = BIO_get_data(channel);
  68     size_t cnt = ctx->callback(buf, num, ctx->category, OSSL_TRACE_CTRL_WRITE,
  69                                ctx->data);
  70
  71     *written = cnt;
  72     return cnt != 0;
  73 }
  74
  75 static int trace_puts(BIO *channel, const char *str)
  76 {
  77     size_t written;
  78
  79     if (trace_write(channel, str, strlen(str), &written))
  80         return (int)written;
  81
  82     return EOF;
  83 }
  84
  85 static long trace_ctrl(BIO *channel, int cmd, long argl, void *argp)
  86 {
  87     struct trace_data_st *ctx = BIO_get_data(channel);
  88
  89     switch (cmd) {
  90     case OSSL_TRACE_CTRL_BEGIN:
  91     case OSSL_TRACE_CTRL_END:
  92         /* We know that the callback is likely to return 0 here */
  93         ctx->callback("", 0, ctx->category, cmd, ctx->data);
  94         return 1;
  95     default:
  96         break;
  97     }
  98     return -2;                   /* Unsupported */
  99 }
 100
 101 static int trace_free(BIO *channel)
 102 {
 103     if (channel == NULL)
 104         return 0;
 105     OPENSSL_free(BIO_get_data(channel));
 106     return 1;
 107 }
 108 #endif
 109
 110 /*-
 111  * TRACE
 112  */
 113
 114 /* Helper struct and macro to get name string to number mapping */
 115 struct trace_category_st {
 116     const char * const name;
 117     const int num;
 118 };
 119 #define TRACE_CATEGORY_(name)       { #name, OSSL_TRACE_CATEGORY_##name }
 120
 121 static const struct trace_category_st trace_categories[] = {
 122     TRACE_CATEGORY_(ALL),
 123     TRACE_CATEGORY_(TRACE),
 124     TRACE_CATEGORY_(INIT),
 125     TRACE_CATEGORY_(TLS),
 126     TRACE_CATEGORY_(TLS_CIPHER),
 127     TRACE_CATEGORY_(CONF),
 128     TRACE_CATEGORY_(ENGINE_TABLE),
 129     TRACE_CATEGORY_(ENGINE_REF_COUNT),
 130     TRACE_CATEGORY_(PKCS5V2),
 131     TRACE_CATEGORY_(PKCS12_KEYGEN),
 132     TRACE_CATEGORY_(PKCS12_DECRYPT),
 133     TRACE_CATEGORY_(X509V3_POLICY),
 134     TRACE_CATEGORY_(BN_CTX),
 135     TRACE_CATEGORY_(PROV),
 136     TRACE_CATEGORY_(FETCH),
 137 };
 138
 139 const char *OSSL_trace_get_category_name(int num)
 140 {
 141     size_t i;
 142
 143     for (i = 0; i < OSSL_NELEM(trace_categories); i++)
 144         if (trace_categories[i].num == num)
 145             return trace_categories[i].name;
 146     return NULL; /* not found */
 147 }
 148
 149 int OSSL_trace_get_category_num(const char *name)
 150 {
 151     size_t i;
 152
 153     for (i = 0; i < OSSL_NELEM(trace_categories); i++)
 154         if (strcasecmp(name, trace_categories[i].name) == 0)
 155             return trace_categories[i].num;
 156     return -1; /* not found */
 157 }
 158
 159 #ifndef OPENSSL_NO_TRACE
 160
 161 /* We use one trace channel for each trace category */
 162 static struct {
 163     enum { SIMPLE_CHANNEL, CALLBACK_CHANNEL } type;
 164     BIO *bio;
 165     char *prefix;
 166     char *suffix;
 167 } trace_channels[OSSL_TRACE_CATEGORY_NUM] = {
 168     { 0, NULL, NULL, NULL },
 169 };
 170
 171 #endif
 172
 173 #ifndef OPENSSL_NO_TRACE
 174
 175 enum {
 176     CHANNEL,
 177     PREFIX,
 178     SUFFIX
 179 };
 180
 181 static int trace_attach_cb(int category, int type, const void *data)
 182 {
 183     switch (type) {
 184     case CHANNEL:
 185         OSSL_TRACE2(TRACE, "Attach channel %p to category '%s'\n",
 186                     data, trace_categories[category].name);
 187         break;
 188     case PREFIX:
 189         OSSL_TRACE2(TRACE, "Attach prefix \"%s\" to category '%s'\n",
 190                     (const char *)data, trace_categories[category].name);
 191         break;
 192     case SUFFIX:
 193         OSSL_TRACE2(TRACE, "Attach suffix \"%s\" to category '%s'\n",
 194                     (const char *)data, trace_categories[category].name);
 195         break;
 196     default:                     /* No clue */
 197         break;
 198     }
 199     return 1;
 200 }
 201
 202 static int trace_detach_cb(int category, int type, const void *data)
 203 {
 204     switch (type) {
 205     case CHANNEL:
 206         OSSL_TRACE2(TRACE, "Detach channel %p from category '%s'\n",
 207                     data, trace_categories[category].name);
 208         break;
 209     case PREFIX:
 210         OSSL_TRACE2(TRACE, "Detach prefix \"%s\" from category '%s'\n",
 211                     (const char *)data, trace_categories[category].name);
 212         break;
 213     case SUFFIX:
 214         OSSL_TRACE2(TRACE, "Detach suffix \"%s\" from category '%s'\n",
 215                     (const char *)data, trace_categories[category].name);
 216         break;
 217     default:                     /* No clue */
 218         break;
 219     }
 220     return 1;
 221 }
 222
 223 static int set_trace_data(int category, int type, BIO **channel,
 224                           const char **prefix, const char **suffix,
 225                           int (*attach_cb)(int, int, const void *),
 226                           int (*detach_cb)(int, int, const void *))
 227 {
 228     BIO *curr_channel = NULL;
 229     char *curr_prefix = NULL;
 230     char *curr_suffix = NULL;
 231
 232     /* Ensure ossl_trace_init() is called */
 233     OPENSSL_init_crypto(0, NULL);
 234
 235     curr_channel = trace_channels[category].bio;
 236     curr_prefix = trace_channels[category].prefix;
 237     curr_suffix = trace_channels[category].suffix;
 238
 239     /* Make sure to run the detach callback first on all data */
 240     if (prefix != NULL && curr_prefix != NULL) {
 241         detach_cb(category, PREFIX, curr_prefix);
 242     }
 243
 244     if (suffix != NULL && curr_suffix != NULL) {
 245         detach_cb(category, SUFFIX, curr_suffix);
 246     }
 247
 248     if (channel != NULL && curr_channel != NULL) {
 249         detach_cb(category, CHANNEL, curr_channel);
 250     }
 251
 252     /* After detach callbacks are done, clear data where appropriate */
 253     if (prefix != NULL && curr_prefix != NULL) {
 254         OPENSSL_free(curr_prefix);
 255         trace_channels[category].prefix = NULL;
 256     }
 257
 258     if (suffix != NULL && curr_suffix != NULL) {
 259         OPENSSL_free(curr_suffix);
 260         trace_channels[category].suffix = NULL;
 261     }
 262
 263     if (channel != NULL && curr_channel != NULL) {
 264         BIO_free(curr_channel);
 265         trace_channels[category].type = 0;
 266         trace_channels[category].bio = NULL;
 267     }
 268
 269     /* Before running callbacks are done, set new data where appropriate */
 270     if (channel != NULL && *channel != NULL) {
 271         trace_channels[category].type = type;
 272         trace_channels[category].bio = *channel;
 273     }
 274
 275     if (prefix != NULL && *prefix != NULL) {
 276         if ((curr_prefix = OPENSSL_strdup(*prefix)) == NULL)
 277             return 0;
 278         trace_channels[category].prefix = curr_prefix;
 279     }
 280
 281     if (suffix != NULL && *suffix != NULL) {
 282         if ((curr_suffix = OPENSSL_strdup(*suffix)) == NULL)
 283             return 0;
 284         trace_channels[category].suffix = curr_suffix;
 285     }
 286
 287     /* Finally, run the attach callback on the new data */
 288     if (channel != NULL && *channel != NULL) {
 289         attach_cb(category, CHANNEL, *channel);
 290     }
 291
 292     if (prefix != NULL && *prefix != NULL) {
 293         attach_cb(category, PREFIX, *prefix);
 294     }
 295
 296     if (suffix != NULL && *suffix != NULL) {
 297         attach_cb(category, SUFFIX, *suffix);
 298     }
 299
 300     return 1;
 301 }
 302 #endif
 303
 304 int ossl_trace_init(void)
 305 {
 306 #ifndef OPENSSL_NO_TRACE
 307     trace_lock = CRYPTO_THREAD_lock_new();
 308     if (trace_lock == NULL)
 309         return 0;
 310 #endif
 311
 312     return 1;
 313 }
 314
 315 void ossl_trace_cleanup(void)
 316 {
 317 #ifndef OPENSSL_NO_TRACE
 318     int category;
 319     BIO *channel = NULL;
 320     const char *prefix = NULL;
 321     const char *suffix = NULL;
 322
 323     for (category = 0; category < OSSL_TRACE_CATEGORY_NUM; category++) {
 324         /* We force the TRACE category to be treated last */
 325         if (category == OSSL_TRACE_CATEGORY_TRACE)
 326             continue;
 327         set_trace_data(category, 0, &channel, &prefix, &suffix,
 328                        trace_attach_cb, trace_detach_cb);
 329     }
 330     set_trace_data(OSSL_TRACE_CATEGORY_TRACE, 0, &channel,
 331                    &prefix, &suffix,
 332                    trace_attach_cb, trace_detach_cb);
 333     CRYPTO_THREAD_lock_free(trace_lock);
 334 #endif
 335 }
 336
 337 int OSSL_trace_set_channel(int category, BIO *channel)
 338 {
 339 #ifndef OPENSSL_NO_TRACE
 340     if (category >= 0 && category < OSSL_TRACE_CATEGORY_NUM)
 341         return set_trace_data(category, SIMPLE_CHANNEL, &channel, NULL, NULL,
 342                               trace_attach_cb, trace_detach_cb);
 343 #endif
 344     return 0;
 345 }
 346
 347 #ifndef OPENSSL_NO_TRACE
 348 static int trace_attach_w_callback_cb(int category, int type, const void *data)
 349 {
 350     switch (type) {
 351     case CHANNEL:
 352         OSSL_TRACE2(TRACE,
 353                     "Attach channel %p to category '%s' (with callback)\n",
 354                     data, trace_categories[category].name);
 355         break;
 356     case PREFIX:
 357         OSSL_TRACE2(TRACE, "Attach prefix \"%s\" to category '%s'\n",
 358                     (const char *)data, trace_categories[category].name);
 359         break;
 360     case SUFFIX:
 361         OSSL_TRACE2(TRACE, "Attach suffix \"%s\" to category '%s'\n",
 362                     (const char *)data, trace_categories[category].name);
 363         break;
 364     default:                     /* No clue */
 365         break;
 366     }
 367     return 1;
 368 }
 369 #endif
 370
 371 int OSSL_trace_set_callback(int category, OSSL_trace_cb callback, void *data)
 372 {
 373 #ifndef OPENSSL_NO_TRACE
 374     BIO *channel = NULL;
 375     struct trace_data_st *trace_data = NULL;
 376
 377     if (category < 0 || category >= OSSL_TRACE_CATEGORY_NUM)
 378         return 0;
 379
 380     if (callback != NULL) {
 381         if ((channel = BIO_new(&trace_method)) == NULL
 382             || (trace_data =
 383                 OPENSSL_zalloc(sizeof(struct trace_data_st))) == NULL)
 384             goto err;
 385
 386         trace_data->callback = callback;
 387         trace_data->category = category;
 388         trace_data->data = data;
 389
 390         BIO_set_data(channel, trace_data);
 391     }
 392
 393     if (!set_trace_data(category, CALLBACK_CHANNEL, &channel, NULL, NULL,
 394                         trace_attach_w_callback_cb, trace_detach_cb))
 395         goto err;
 396
 397     return 1;
 398
 399  err:
 400     BIO_free(channel);
 401     OPENSSL_free(trace_data);
 402 #endif
 403
 404     return 0;
 405 }
 406
 407 int OSSL_trace_set_prefix(int category, const char *prefix)
 408 {
 409 #ifndef OPENSSL_NO_TRACE
 410     if (category >= 0 && category < OSSL_TRACE_CATEGORY_NUM)
 411         return set_trace_data(category, 0, NULL, &prefix, NULL,
 412                               trace_attach_cb, trace_detach_cb);
 413 #endif
 414     return 0;
 415 }
 416
 417 int OSSL_trace_set_suffix(int category, const char *suffix)
 418 {
 419 #ifndef OPENSSL_NO_TRACE
 420     if (category >= 0 && category < OSSL_TRACE_CATEGORY_NUM)
 421         return set_trace_data(category, 0, NULL, NULL, &suffix,
 422                               trace_attach_cb, trace_detach_cb);
 423 #endif
 424     return 0;
 425 }
 426
 427 #ifndef OPENSSL_NO_TRACE
 428 static int ossl_trace_get_category(int category)
 429 {
 430     if (category < 0 || category >= OSSL_TRACE_CATEGORY_NUM)
 431         return -1;
 432     if (trace_channels[category].bio != NULL)
 433         return category;
 434     return OSSL_TRACE_CATEGORY_ALL;
 435 }
 436 #endif
 437
 438 int OSSL_trace_enabled(int category)
 439 {
 440     int ret = 0;
 441 #ifndef OPENSSL_NO_TRACE
 442     category = ossl_trace_get_category(category);
 443     if (category >= 0)
 444         ret = trace_channels[category].bio != NULL;
 445 #endif
 446     return ret;
 447 }
 448
 449 BIO *OSSL_trace_begin(int category)
 450 {
 451     BIO *channel = NULL;
 452 #ifndef OPENSSL_NO_TRACE
 453     char *prefix = NULL;
 454
 455     category = ossl_trace_get_category(category);
 456     if (category < 0)
 457         return NULL;
 458
 459     channel = trace_channels[category].bio;
 460     prefix = trace_channels[category].prefix;
 461
 462     if (channel != NULL) {
 463         CRYPTO_THREAD_write_lock(trace_lock);
 464         current_channel = channel;
 465         switch (trace_channels[category].type) {
 466         case SIMPLE_CHANNEL:
 467             if (prefix != NULL) {
 468                 (void)BIO_puts(channel, prefix);
 469                 (void)BIO_puts(channel, "\n");
 470             }
 471             break;
 472         case CALLBACK_CHANNEL:
 473             (void)BIO_ctrl(channel, OSSL_TRACE_CTRL_BEGIN,
 474                            prefix == NULL ? 0 : strlen(prefix), prefix);
 475             break;
 476         }
 477     }
 478 #endif
 479     return channel;
 480 }
 481
 482 void OSSL_trace_end(int category, BIO * channel)
 483 {
 484 #ifndef OPENSSL_NO_TRACE
 485     char *suffix = NULL;
 486
 487     category = ossl_trace_get_category(category);
 488     suffix = trace_channels[category].suffix;
 489     if (channel != NULL
 490         && ossl_assert(channel == current_channel)) {
 491         (void)BIO_flush(channel);
 492         switch (trace_channels[category].type) {
 493         case SIMPLE_CHANNEL:
 494             if (suffix != NULL) {
 495                 (void)BIO_puts(channel, suffix);
 496                 (void)BIO_puts(channel, "\n");
 497             }
 498             break;
 499         case CALLBACK_CHANNEL:
 500             (void)BIO_ctrl(channel, OSSL_TRACE_CTRL_END,
 501                            suffix == NULL ? 0 : strlen(suffix), suffix);
 502             break;
 503         }
 504         current_channel = NULL;
 505         CRYPTO_THREAD_unlock(trace_lock);
 506     }
 507 #endif
 508 }