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 "internal/thread_once.h"
  14 #include <openssl/bio.h>
  15 #include <openssl/crypto.h>
  16 #include <openssl/trace.h>
  17 #include "internal/bio.h"
  18 #include "internal/nelem.h"
  19 #include "crypto/cryptlib.h"
  20
  21 #include "e_os.h"                /* strcasecmp for Windows */
  22
  23 #ifndef OPENSSL_NO_TRACE
  24
  25 static CRYPTO_RWLOCK *trace_lock = NULL;
  26
  27 static const BIO  *current_channel = NULL;
  28
  29 /*-
  30  * INTERNAL TRACE CHANNEL IMPLEMENTATION
  31  *
  32  * For our own flexibility, all trace categories are associated with a
  33  * BIO sink object, also called the trace channel. Instead of a BIO object,
  34  * the application can also provide a callback function, in which case an
  35  * internal trace channel is attached, which simply calls the registered
  36  * callback function.
  37  */
  38 static int trace_write(BIO *b, const char *buf,
  39                                size_t num, size_t *written);
  40 static int trace_puts(BIO *b, const char *str);
  41 static long trace_ctrl(BIO *channel, int cmd, long argl, void *argp);
  42 static int trace_free(BIO *b);
  43
  44 static const BIO_METHOD trace_method = {
  45     BIO_TYPE_SOURCE_SINK,
  46     "trace",
  47     trace_write,
  48     NULL,                        /* old write */
  49     NULL,                        /* read_ex */
  50     NULL,                        /* read */
  51     trace_puts,
  52     NULL,                        /* gets */
  53     trace_ctrl,                  /* ctrl */
  54     NULL,                        /* create */
  55     trace_free,                  /* free */
  56     NULL,                        /* callback_ctrl */
  57 };
  58
  59 struct trace_data_st {
  60     OSSL_trace_cb callback;
  61     int category;
  62     void *data;
  63 };
  64
  65 static int trace_write(BIO *channel,
  66                        const char *buf, size_t num, size_t *written)
  67 {
  68     struct trace_data_st *ctx = BIO_get_data(channel);
  69     size_t cnt = ctx->callback(buf, num, ctx->category, OSSL_TRACE_CTRL_WRITE,
  70                                ctx->data);
  71
  72     *written = cnt;
  73     return cnt != 0;
  74 }
  75
  76 static int trace_puts(BIO *channel, const char *str)
  77 {
  78     size_t written;
  79
  80     if (trace_write(channel, str, strlen(str), &written))
  81         return (int)written;
  82
  83     return EOF;
  84 }
  85
  86 static long trace_ctrl(BIO *channel, int cmd, long argl, void *argp)
  87 {
  88     struct trace_data_st *ctx = BIO_get_data(channel);
  89
  90     switch (cmd) {
  91     case OSSL_TRACE_CTRL_BEGIN:
  92     case OSSL_TRACE_CTRL_END:
  93         /* We know that the callback is likely to return 0 here */
  94         ctx->callback("", 0, ctx->category, cmd, ctx->data);
  95         return 1;
  96     default:
  97         break;
  98     }
  99     return -2;                   /* Unsupported */
 100 }
 101
 102 static int trace_free(BIO *channel)
 103 {
 104     if (channel == NULL)
 105         return 0;
 106     OPENSSL_free(BIO_get_data(channel));
 107     return 1;
 108 }
 109 #endif
 110
 111 /*-
 112  * TRACE
 113  */
 114
 115 /* Helper struct and macro to get name string to number mapping */
 116 struct trace_category_st {
 117     const char * const name;
 118     const int num;
 119 };
 120 #define TRACE_CATEGORY_(name)       { #name, OSSL_TRACE_CATEGORY_##name }
 121
 122 static const struct trace_category_st trace_categories[] = {
 123     TRACE_CATEGORY_(ALL),
 124     TRACE_CATEGORY_(TRACE),
 125     TRACE_CATEGORY_(INIT),
 126     TRACE_CATEGORY_(TLS),
 127     TRACE_CATEGORY_(TLS_CIPHER),
 128     TRACE_CATEGORY_(CONF),
 129 #ifndef OPENSSL_NO_ENGINE
 130     TRACE_CATEGORY_(ENGINE_TABLE),
 131     TRACE_CATEGORY_(ENGINE_REF_COUNT),
 132 #endif
 133     TRACE_CATEGORY_(PKCS5V2),
 134     TRACE_CATEGORY_(PKCS12_KEYGEN),
 135     TRACE_CATEGORY_(PKCS12_DECRYPT),
 136     TRACE_CATEGORY_(X509V3_POLICY),
 137     TRACE_CATEGORY_(BN_CTX),
 138     TRACE_CATEGORY_(STORE),
 139 };
 140
 141 const char *OSSL_trace_get_category_name(int num)
 142 {
 143     size_t i;
 144
 145     for (i = 0; i < OSSL_NELEM(trace_categories); i++)
 146         if (trace_categories[i].num == num)
 147             return trace_categories[i].name;
 148     return NULL; /* not found */
 149 }
 150
 151 int OSSL_trace_get_category_num(const char *name)
 152 {
 153     size_t i;
 154
 155     for (i = 0; i < OSSL_NELEM(trace_categories); i++)
 156         if (strcasecmp(name, trace_categories[i].name) == 0)
 157             return trace_categories[i].num;
 158     return -1; /* not found */
 159 }
 160
 161 #ifndef OPENSSL_NO_TRACE
 162
 163 /* We use one trace channel for each trace category */
 164 static struct {
 165     enum { SIMPLE_CHANNEL, CALLBACK_CHANNEL } type;
 166     BIO *bio;
 167     char *prefix;
 168     char *suffix;
 169 } trace_channels[OSSL_TRACE_CATEGORY_NUM] = {
 170     { 0, NULL, NULL, NULL },
 171 };
 172
 173 #endif
 174
 175 #ifndef OPENSSL_NO_TRACE
 176
 177 enum {
 178     CHANNEL,
 179     PREFIX,
 180     SUFFIX
 181 };
 182
 183 static int trace_attach_cb(int category, int type, const void *data)
 184 {
 185     switch (type) {
 186     case CHANNEL:
 187         OSSL_TRACE2(TRACE, "Attach channel %p to category '%s'\n",
 188                     data, trace_categories[category].name);
 189         break;
 190     case PREFIX:
 191         OSSL_TRACE2(TRACE, "Attach prefix \"%s\" to category '%s'\n",
 192                     (const char *)data, trace_categories[category].name);
 193         break;
 194     case SUFFIX:
 195         OSSL_TRACE2(TRACE, "Attach suffix \"%s\" to category '%s'\n",
 196                     (const char *)data, trace_categories[category].name);
 197         break;
 198     default:                     /* No clue */
 199         break;
 200     }
 201     return 1;
 202 }
 203
 204 static int trace_detach_cb(int category, int type, const void *data)
 205 {
 206     switch (type) {
 207     case CHANNEL:
 208         OSSL_TRACE2(TRACE, "Detach channel %p from category '%s'\n",
 209                     data, trace_categories[category].name);
 210         break;
 211     case PREFIX:
 212         OSSL_TRACE2(TRACE, "Detach prefix \"%s\" from category '%s'\n",
 213                     (const char *)data, trace_categories[category].name);
 214         break;
 215     case SUFFIX:
 216         OSSL_TRACE2(TRACE, "Detach suffix \"%s\" from category '%s'\n",
 217                     (const char *)data, trace_categories[category].name);
 218         break;
 219     default:                     /* No clue */
 220         break;
 221     }
 222     return 1;
 223 }
 224
 225 static int do_ossl_trace_init(void);
 226 static CRYPTO_ONCE trace_inited = CRYPTO_ONCE_STATIC_INIT;
 227 DEFINE_RUN_ONCE_STATIC(ossl_trace_init)
 228 {
 229     return do_ossl_trace_init();
 230 }
 231
 232 static int set_trace_data(int category, int type, BIO **channel,
 233                           const char **prefix, const char **suffix,
 234                           int (*attach_cb)(int, int, const void *),
 235                           int (*detach_cb)(int, int, const void *))
 236 {
 237     BIO *curr_channel = NULL;
 238     char *curr_prefix = NULL;
 239     char *curr_suffix = NULL;
 240
 241     /* Ensure do_ossl_trace_init() is called once */
 242     if (!RUN_ONCE(&trace_inited, ossl_trace_init))
 243         return 0;
 244
 245     curr_channel = trace_channels[category].bio;
 246     curr_prefix = trace_channels[category].prefix;
 247     curr_suffix = trace_channels[category].suffix;
 248
 249     /* Make sure to run the detach callback first on all data */
 250     if (prefix != NULL && curr_prefix != NULL) {
 251         detach_cb(category, PREFIX, curr_prefix);
 252     }
 253
 254     if (suffix != NULL && curr_suffix != NULL) {
 255         detach_cb(category, SUFFIX, curr_suffix);
 256     }
 257
 258     if (channel != NULL && curr_channel != NULL) {
 259         detach_cb(category, CHANNEL, curr_channel);
 260     }
 261
 262     /* After detach callbacks are done, clear data where appropriate */
 263     if (prefix != NULL && curr_prefix != NULL) {
 264         OPENSSL_free(curr_prefix);
 265         trace_channels[category].prefix = NULL;
 266     }
 267
 268     if (suffix != NULL && curr_suffix != NULL) {
 269         OPENSSL_free(curr_suffix);
 270         trace_channels[category].suffix = NULL;
 271     }
 272
 273     if (channel != NULL && curr_channel != NULL) {
 274         BIO_free(curr_channel);
 275         trace_channels[category].type = 0;
 276         trace_channels[category].bio = NULL;
 277     }
 278
 279     /* Before running callbacks are done, set new data where appropriate */
 280     if (channel != NULL && *channel != NULL) {
 281         trace_channels[category].type = type;
 282         trace_channels[category].bio = *channel;
 283     }
 284
 285     if (prefix != NULL && *prefix != NULL) {
 286         if ((curr_prefix = OPENSSL_strdup(*prefix)) == NULL)
 287             return 0;
 288         trace_channels[category].prefix = curr_prefix;
 289     }
 290
 291     if (suffix != NULL && *suffix != NULL) {
 292         if ((curr_suffix = OPENSSL_strdup(*suffix)) == NULL)
 293             return 0;
 294         trace_channels[category].suffix = curr_suffix;
 295     }
 296
 297     /* Finally, run the attach callback on the new data */
 298     if (channel != NULL && *channel != NULL) {
 299         attach_cb(category, CHANNEL, *channel);
 300     }
 301
 302     if (prefix != NULL && *prefix != NULL) {
 303         attach_cb(category, PREFIX, *prefix);
 304     }
 305
 306     if (suffix != NULL && *suffix != NULL) {
 307         attach_cb(category, SUFFIX, *suffix);
 308     }
 309
 310     return 1;
 311 }
 312
 313 static int do_ossl_trace_init(void)
 314 {
 315     trace_lock = CRYPTO_THREAD_lock_new();
 316     return trace_lock != NULL;
 317 }
 318
 319 #endif
 320
 321 void ossl_trace_cleanup(void)
 322 {
 323 #ifndef OPENSSL_NO_TRACE
 324     int category;
 325     BIO *channel = NULL;
 326     const char *prefix = NULL;
 327     const char *suffix = NULL;
 328
 329     for (category = 0; category < OSSL_TRACE_CATEGORY_NUM; category++) {
 330         /* We force the TRACE category to be treated last */
 331         if (category == OSSL_TRACE_CATEGORY_TRACE)
 332             continue;
 333         set_trace_data(category, 0, &channel, &prefix, &suffix,
 334                        trace_attach_cb, trace_detach_cb);
 335     }
 336     set_trace_data(OSSL_TRACE_CATEGORY_TRACE, 0, &channel,
 337                    &prefix, &suffix,
 338                    trace_attach_cb, trace_detach_cb);
 339     CRYPTO_THREAD_lock_free(trace_lock);
 340 #endif
 341 }
 342
 343 int OSSL_trace_set_channel(int category, BIO *channel)
 344 {
 345 #ifndef OPENSSL_NO_TRACE
 346     if (category >= 0 && category < OSSL_TRACE_CATEGORY_NUM)
 347         return set_trace_data(category, SIMPLE_CHANNEL, &channel, NULL, NULL,
 348                               trace_attach_cb, trace_detach_cb);
 349 #endif
 350     return 0;
 351 }
 352
 353 #ifndef OPENSSL_NO_TRACE
 354 static int trace_attach_w_callback_cb(int category, int type, const void *data)
 355 {
 356     switch (type) {
 357     case CHANNEL:
 358         OSSL_TRACE2(TRACE,
 359                     "Attach channel %p to category '%s' (with callback)\n",
 360                     data, trace_categories[category].name);
 361         break;
 362     case PREFIX:
 363         OSSL_TRACE2(TRACE, "Attach prefix \"%s\" to category '%s'\n",
 364                     (const char *)data, trace_categories[category].name);
 365         break;
 366     case SUFFIX:
 367         OSSL_TRACE2(TRACE, "Attach suffix \"%s\" to category '%s'\n",
 368                     (const char *)data, trace_categories[category].name);
 369         break;
 370     default:                     /* No clue */
 371         break;
 372     }
 373     return 1;
 374 }
 375 #endif
 376
 377 int OSSL_trace_set_callback(int category, OSSL_trace_cb callback, void *data)
 378 {
 379 #ifndef OPENSSL_NO_TRACE
 380     BIO *channel = NULL;
 381     struct trace_data_st *trace_data = NULL;
 382
 383     if (category < 0 || category >= OSSL_TRACE_CATEGORY_NUM)
 384         return 0;
 385
 386     if (callback != NULL) {
 387         if ((channel = BIO_new(&trace_method)) == NULL
 388             || (trace_data =
 389                 OPENSSL_zalloc(sizeof(struct trace_data_st))) == NULL)
 390             goto err;
 391
 392         trace_data->callback = callback;
 393         trace_data->category = category;
 394         trace_data->data = data;
 395
 396         BIO_set_data(channel, trace_data);
 397     }
 398
 399     if (!set_trace_data(category, CALLBACK_CHANNEL, &channel, NULL, NULL,
 400                         trace_attach_w_callback_cb, trace_detach_cb))
 401         goto err;
 402
 403     return 1;
 404
 405  err:
 406     BIO_free(channel);
 407     OPENSSL_free(trace_data);
 408 #endif
 409
 410     return 0;
 411 }
 412
 413 int OSSL_trace_set_prefix(int category, const char *prefix)
 414 {
 415 #ifndef OPENSSL_NO_TRACE
 416     if (category >= 0 && category < OSSL_TRACE_CATEGORY_NUM)
 417         return set_trace_data(category, 0, NULL, &prefix, NULL,
 418                               trace_attach_cb, trace_detach_cb);
 419 #endif
 420     return 0;
 421 }
 422
 423 int OSSL_trace_set_suffix(int category, const char *suffix)
 424 {
 425 #ifndef OPENSSL_NO_TRACE
 426     if (category >= 0 && category < OSSL_TRACE_CATEGORY_NUM)
 427         return set_trace_data(category, 0, NULL, NULL, &suffix,
 428                               trace_attach_cb, trace_detach_cb);
 429 #endif
 430     return 0;
 431 }
 432
 433 #ifndef OPENSSL_NO_TRACE
 434 static int ossl_trace_get_category(int category)
 435 {
 436     if (category < 0 || category >= OSSL_TRACE_CATEGORY_NUM)
 437         return -1;
 438     if (trace_channels[category].bio != NULL)
 439         return category;
 440     return OSSL_TRACE_CATEGORY_ALL;
 441 }
 442 #endif
 443
 444 int OSSL_trace_enabled(int category)
 445 {
 446     int ret = 0;
 447 #ifndef OPENSSL_NO_TRACE
 448     category = ossl_trace_get_category(category);
 449     if (category >= 0)
 450         ret = trace_channels[category].bio != NULL;
 451 #endif
 452     return ret;
 453 }
 454
 455 BIO *OSSL_trace_begin(int category)
 456 {
 457     BIO *channel = NULL;
 458 #ifndef OPENSSL_NO_TRACE
 459     char *prefix = NULL;
 460
 461     category = ossl_trace_get_category(category);
 462     if (category < 0)
 463         return NULL;
 464
 465     channel = trace_channels[category].bio;
 466     prefix = trace_channels[category].prefix;
 467
 468     if (channel != NULL) {
 469         CRYPTO_THREAD_write_lock(trace_lock);
 470         current_channel = channel;
 471         switch (trace_channels[category].type) {
 472         case SIMPLE_CHANNEL:
 473             if (prefix != NULL) {
 474                 (void)BIO_puts(channel, prefix);
 475                 (void)BIO_puts(channel, "\n");
 476             }
 477             break;
 478         case CALLBACK_CHANNEL:
 479             (void)BIO_ctrl(channel, OSSL_TRACE_CTRL_BEGIN,
 480                            prefix == NULL ? 0 : strlen(prefix), prefix);
 481             break;
 482         }
 483     }
 484 #endif
 485     return channel;
 486 }
 487
 488 void OSSL_trace_end(int category, BIO * channel)
 489 {
 490 #ifndef OPENSSL_NO_TRACE
 491     char *suffix = NULL;
 492
 493     category = ossl_trace_get_category(category);
 494     suffix = trace_channels[category].suffix;
 495     if (channel != NULL
 496         && ossl_assert(channel == current_channel)) {
 497         (void)BIO_flush(channel);
 498         switch (trace_channels[category].type) {
 499         case SIMPLE_CHANNEL:
 500             if (suffix != NULL) {
 501                 (void)BIO_puts(channel, suffix);
 502                 (void)BIO_puts(channel, "\n");
 503             }
 504             break;
 505         case CALLBACK_CHANNEL:
 506             (void)BIO_ctrl(channel, OSSL_TRACE_CTRL_END,
 507                            suffix == NULL ? 0 : strlen(suffix), suffix);
 508             break;
 509         }
 510         current_channel = NULL;
 511         CRYPTO_THREAD_unlock(trace_lock);
 512     }
 513 #endif
 514 }