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_DURING,
  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_(ANY),
 123     TRACE_CATEGORY_(INIT),
 124     TRACE_CATEGORY_(TLS),
 125     TRACE_CATEGORY_(TLS_CIPHER),
 126     TRACE_CATEGORY_(ENGINE_CONF),
 127     TRACE_CATEGORY_(ENGINE_TABLE),
 128     TRACE_CATEGORY_(ENGINE_REF_COUNT),
 129     TRACE_CATEGORY_(PKCS5V2),
 130     TRACE_CATEGORY_(PKCS12_KEYGEN),
 131     TRACE_CATEGORY_(PKCS12_DECRYPT),
 132     TRACE_CATEGORY_(X509V3_POLICY),
 133     TRACE_CATEGORY_(BN_CTX),
 134 };
 135
 136 const char *OSSL_trace_get_category_name(int num)
 137 {
 138     size_t i;
 139
 140     for (i = 0; i < OSSL_NELEM(trace_categories); i++)
 141         if (trace_categories[i].num == num)
 142             return trace_categories[i].name;
 143     return NULL; /* not found */
 144 }
 145
 146 int OSSL_trace_get_category_num(const char *name)
 147 {
 148     size_t i;
 149
 150     for (i = 0; i < OSSL_NELEM(trace_categories); i++)
 151         if (strcasecmp(name, trace_categories[i].name) == 0)
 152             return trace_categories[i].num;
 153     return -1; /* not found */
 154 }
 155
 156 #ifndef OPENSSL_NO_TRACE
 157
 158 /* We use one trace channel for each trace category */
 159 static struct {
 160     enum { t_channel, t_callback } type;
 161     BIO *bio;
 162     char *prefix;
 163     char *suffix;
 164 } trace_channels[OSSL_TRACE_CATEGORY_NUM] = {
 165     { 0, NULL, NULL, NULL },
 166 };
 167
 168 #endif
 169
 170 int ossl_trace_init(void)
 171 {
 172 #ifndef OPENSSL_NO_TRACE
 173     trace_lock = CRYPTO_THREAD_lock_new();
 174     if (trace_lock != NULL)
 175         return 1;
 176 #endif
 177
 178     return 0;
 179 }
 180
 181 void ossl_trace_cleanup(void)
 182 {
 183 #ifndef OPENSSL_NO_TRACE
 184     int category;
 185
 186     for (category = 0; category < OSSL_TRACE_CATEGORY_NUM; category++)
 187         OSSL_trace_set_channel(category, NULL);
 188     CRYPTO_THREAD_lock_free(trace_lock);
 189 #endif
 190 }
 191
 192 int OSSL_trace_set_channel(int category, BIO *channel)
 193 {
 194 #ifndef OPENSSL_NO_TRACE
 195     BIO *prev_channel;
 196
 197     if (category < 0 || category >= OSSL_TRACE_CATEGORY_NUM)
 198         goto err;
 199
 200     prev_channel = trace_channels[category].bio;
 201
 202     if (prev_channel != NULL) {
 203         BIO_free(prev_channel);
 204         trace_channels[category].bio = NULL;
 205     }
 206
 207     if (channel == NULL)
 208         return 1;                /* Done */
 209
 210     trace_channels[category].bio = channel;
 211     trace_channels[category].type = t_channel;
 212
 213     return 1;
 214
 215  err:
 216 #endif
 217
 218     return 0;
 219 }
 220
 221 int OSSL_trace_set_callback(int category, OSSL_trace_cb callback, void *data)
 222 {
 223 #ifndef OPENSSL_NO_TRACE
 224     BIO *channel = trace_channels[category].bio;
 225     struct trace_data_st *trace_data = NULL;
 226
 227     if (channel != NULL) {
 228         BIO_free(channel);
 229         trace_channels[category].bio = NULL;
 230     }
 231
 232     if (callback == NULL)
 233         return 1; /* done */
 234
 235     channel = BIO_new(&trace_method);
 236     if (channel == NULL)
 237         goto err;
 238
 239     trace_data = OPENSSL_zalloc(sizeof(struct trace_data_st));
 240     if (trace_data == NULL)
 241         goto err;
 242
 243     trace_data->callback = callback;
 244     trace_data->category = category;
 245     trace_data->data = data;
 246
 247     BIO_set_data(channel, trace_data);
 248
 249     trace_channels[category].bio = channel;
 250     trace_channels[category].type = t_callback;
 251
 252     return 1;
 253
 254  err:
 255     BIO_free(channel);
 256     OPENSSL_free(trace_data);
 257 #endif
 258
 259     return 0;
 260 }
 261
 262 int OSSL_trace_set_prefix(int category, const char *prefix)
 263 {
 264 #ifndef OPENSSL_NO_TRACE
 265     char *curr_prefix = trace_channels[category].prefix;
 266
 267     if (curr_prefix != NULL) {
 268         OPENSSL_free(curr_prefix);
 269         trace_channels[category].prefix = NULL;
 270     }
 271
 272     if (prefix == NULL)
 273         return 1;                /* Done */
 274
 275     curr_prefix = OPENSSL_strdup(prefix);
 276     if (curr_prefix == NULL)
 277         goto err;
 278
 279     trace_channels[category].prefix = curr_prefix;
 280
 281     return 1;
 282
 283  err:
 284 #endif
 285
 286     return 0;
 287 }
 288
 289 int OSSL_trace_set_suffix(int category, const char *suffix)
 290 {
 291 #ifndef OPENSSL_NO_TRACE
 292     char *curr_suffix = trace_channels[category].suffix;
 293
 294     if (curr_suffix != NULL) {
 295         OPENSSL_free(curr_suffix);
 296         trace_channels[category].suffix = NULL;
 297     }
 298
 299     if (suffix == NULL)
 300         return 1; /* done */
 301
 302     curr_suffix = OPENSSL_strdup(suffix);
 303     if (curr_suffix == NULL)
 304         goto err;
 305
 306     trace_channels[category].suffix = curr_suffix;
 307
 308     return 1;
 309
 310  err:
 311 #endif
 312
 313     return 0;
 314 }
 315
 316 #ifndef OPENSSL_NO_TRACE
 317 static int ossl_trace_get_category(int category)
 318 {
 319     if (category < 0 || category >= OSSL_TRACE_CATEGORY_NUM)
 320         return -1;
 321     if (trace_channels[category].bio != NULL)
 322         return category;
 323     return OSSL_TRACE_CATEGORY_ANY;
 324 }
 325 #endif
 326
 327 int OSSL_trace_enabled(int category)
 328 {
 329     int ret = 0;
 330 #ifndef OPENSSL_NO_TRACE
 331     category = ossl_trace_get_category(category);
 332     ret = trace_channels[category].bio != NULL;
 333 #endif
 334     return ret;
 335 }
 336
 337 BIO *OSSL_trace_begin(int category)
 338 {
 339     BIO *channel = NULL;
 340 #ifndef OPENSSL_NO_TRACE
 341     char *prefix = NULL;
 342
 343     category = ossl_trace_get_category(category);
 344     channel = trace_channels[category].bio;
 345     prefix = trace_channels[category].prefix;
 346
 347     if (channel != NULL) {
 348         CRYPTO_THREAD_write_lock(trace_lock);
 349         current_channel = channel;
 350         switch (trace_channels[category].type) {
 351         case t_channel:
 352             if (prefix != NULL) {
 353                 (void)BIO_puts(channel, prefix);
 354                 (void)BIO_puts(channel, "\n");
 355             }
 356             break;
 357         case t_callback:
 358             (void)BIO_ctrl(channel, OSSL_TRACE_CTRL_BEGIN,
 359                            prefix == NULL ? 0 : strlen(prefix), prefix);
 360             break;
 361         }
 362     }
 363 #endif
 364     return channel;
 365 }
 366
 367 void OSSL_trace_end(int category, BIO * channel)
 368 {
 369 #ifndef OPENSSL_NO_TRACE
 370     char *suffix = NULL;
 371
 372     category = ossl_trace_get_category(category);
 373     suffix = trace_channels[category].suffix;
 374     if (channel != NULL
 375         && ossl_assert(channel == current_channel)) {
 376         (void)BIO_flush(channel);
 377         switch (trace_channels[category].type) {
 378         case t_channel:
 379             if (suffix != NULL) {
 380                 (void)BIO_puts(channel, suffix);
 381                 (void)BIO_puts(channel, "\n");
 382             }
 383             break;
 384         case t_callback:
 385             (void)BIO_ctrl(channel, OSSL_TRACE_CTRL_END,
 386                            suffix == NULL ? 0 : strlen(suffix), suffix);
 387             break;
 388         }
 389         current_channel = NULL;
 390         CRYPTO_THREAD_unlock(trace_lock);
 391     }
 392 #endif
 393 }