2 * Copyright 2019-2022 The OpenSSL Project Authors. All Rights Reserved.
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
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 "internal/refcount.h"
20 #include "crypto/cryptlib.h"
22 #ifndef OPENSSL_NO_TRACE
24 static CRYPTO_RWLOCK *trace_lock = NULL;
26 static const BIO *current_channel = NULL;
29 * INTERNAL TRACE CHANNEL IMPLEMENTATION
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
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);
43 static const BIO_METHOD trace_method = {
52 trace_ctrl, /* ctrl */
54 trace_free, /* free */
55 NULL, /* callback_ctrl */
58 struct trace_data_st {
59 OSSL_trace_cb callback;
64 static int trace_write(BIO *channel,
65 const char *buf, size_t num, size_t *written)
67 struct trace_data_st *ctx = BIO_get_data(channel);
68 size_t cnt = ctx->callback(buf, num, ctx->category, OSSL_TRACE_CTRL_WRITE,
75 static int trace_puts(BIO *channel, const char *str)
79 if (trace_write(channel, str, strlen(str), &written))
85 static long trace_ctrl(BIO *channel, int cmd, long argl, void *argp)
87 struct trace_data_st *ctx = BIO_get_data(channel);
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);
98 return -2; /* Unsupported */
101 static int trace_free(BIO *channel)
105 OPENSSL_free(BIO_get_data(channel));
114 /* Helper struct and macro to get name string to number mapping */
115 struct trace_category_st {
116 const char * const name;
119 #define TRACE_CATEGORY_(name) { #name, OSSL_TRACE_CATEGORY_##name }
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 #ifndef OPENSSL_NO_ENGINE
129 TRACE_CATEGORY_(ENGINE_TABLE),
130 TRACE_CATEGORY_(ENGINE_REF_COUNT),
132 TRACE_CATEGORY_(PKCS5V2),
133 TRACE_CATEGORY_(PKCS12_KEYGEN),
134 TRACE_CATEGORY_(PKCS12_DECRYPT),
135 TRACE_CATEGORY_(X509V3_POLICY),
136 TRACE_CATEGORY_(BN_CTX),
137 TRACE_CATEGORY_(CMP),
138 TRACE_CATEGORY_(STORE),
139 TRACE_CATEGORY_(DECODER),
140 TRACE_CATEGORY_(ENCODER),
141 TRACE_CATEGORY_(REF_COUNT),
142 TRACE_CATEGORY_(HTTP),
143 }; /* KEEP THIS LIST IN SYNC with #define OSSL_TRACE_CATEGORY_... in trace.h */
145 const char *OSSL_trace_get_category_name(int num)
150 * Partial check that OSSL_TRACE_CATEGORY_... macros
151 * are synced with trace_categories array
153 #ifndef OPENSSL_NO_ENGINE
154 if (!ossl_assert(OSSL_TRACE_CATEGORY_NUM == OSSL_NELEM(trace_categories)))
158 for (i = 0; i < OSSL_NELEM(trace_categories); i++)
159 if (trace_categories[i].num == num)
160 return trace_categories[i].name;
162 return NULL; /* not found */
165 int OSSL_trace_get_category_num(const char *name)
172 for (i = 0; i < OSSL_NELEM(trace_categories); i++)
173 if (OPENSSL_strcasecmp(name, trace_categories[i].name) == 0)
174 return trace_categories[i].num;
176 return -1; /* not found */
179 #ifndef OPENSSL_NO_TRACE
181 /* We use one trace channel for each trace category */
183 enum { SIMPLE_CHANNEL, CALLBACK_CHANNEL } type;
187 } trace_channels[OSSL_TRACE_CATEGORY_NUM] = {
188 { 0, NULL, NULL, NULL },
193 #ifndef OPENSSL_NO_TRACE
201 static int trace_attach_cb(int category, int type, const void *data)
205 OSSL_TRACE2(TRACE, "Attach channel %p to category '%s'\n",
206 data, trace_categories[category].name);
209 OSSL_TRACE2(TRACE, "Attach prefix \"%s\" to category '%s'\n",
210 (const char *)data, trace_categories[category].name);
213 OSSL_TRACE2(TRACE, "Attach suffix \"%s\" to category '%s'\n",
214 (const char *)data, trace_categories[category].name);
216 default: /* No clue */
222 static int trace_detach_cb(int category, int type, const void *data)
226 OSSL_TRACE2(TRACE, "Detach channel %p from category '%s'\n",
227 data, trace_categories[category].name);
230 OSSL_TRACE2(TRACE, "Detach prefix \"%s\" from category '%s'\n",
231 (const char *)data, trace_categories[category].name);
234 OSSL_TRACE2(TRACE, "Detach suffix \"%s\" from category '%s'\n",
235 (const char *)data, trace_categories[category].name);
237 default: /* No clue */
243 static int do_ossl_trace_init(void);
244 static CRYPTO_ONCE trace_inited = CRYPTO_ONCE_STATIC_INIT;
245 DEFINE_RUN_ONCE_STATIC(ossl_trace_init)
247 return do_ossl_trace_init();
250 static int set_trace_data(int category, int type, BIO **channel,
251 const char **prefix, const char **suffix,
252 int (*attach_cb)(int, int, const void *),
253 int (*detach_cb)(int, int, const void *))
255 BIO *curr_channel = NULL;
256 char *curr_prefix = NULL;
257 char *curr_suffix = NULL;
259 /* Ensure do_ossl_trace_init() is called once */
260 if (!RUN_ONCE(&trace_inited, ossl_trace_init))
263 curr_channel = trace_channels[category].bio;
264 curr_prefix = trace_channels[category].prefix;
265 curr_suffix = trace_channels[category].suffix;
267 /* Make sure to run the detach callback first on all data */
268 if (prefix != NULL && curr_prefix != NULL) {
269 detach_cb(category, PREFIX, curr_prefix);
272 if (suffix != NULL && curr_suffix != NULL) {
273 detach_cb(category, SUFFIX, curr_suffix);
276 if (channel != NULL && curr_channel != NULL) {
277 detach_cb(category, CHANNEL, curr_channel);
280 /* After detach callbacks are done, clear data where appropriate */
281 if (prefix != NULL && curr_prefix != NULL) {
282 OPENSSL_free(curr_prefix);
283 trace_channels[category].prefix = NULL;
286 if (suffix != NULL && curr_suffix != NULL) {
287 OPENSSL_free(curr_suffix);
288 trace_channels[category].suffix = NULL;
291 if (channel != NULL && curr_channel != NULL) {
292 BIO_free(curr_channel);
293 trace_channels[category].type = 0;
294 trace_channels[category].bio = NULL;
297 /* Before running callbacks are done, set new data where appropriate */
298 if (channel != NULL && *channel != NULL) {
299 trace_channels[category].type = type;
300 trace_channels[category].bio = *channel;
303 if (prefix != NULL && *prefix != NULL) {
304 if ((curr_prefix = OPENSSL_strdup(*prefix)) == NULL)
306 trace_channels[category].prefix = curr_prefix;
309 if (suffix != NULL && *suffix != NULL) {
310 if ((curr_suffix = OPENSSL_strdup(*suffix)) == NULL)
312 trace_channels[category].suffix = curr_suffix;
315 /* Finally, run the attach callback on the new data */
316 if (channel != NULL && *channel != NULL) {
317 attach_cb(category, CHANNEL, *channel);
320 if (prefix != NULL && *prefix != NULL) {
321 attach_cb(category, PREFIX, *prefix);
324 if (suffix != NULL && *suffix != NULL) {
325 attach_cb(category, SUFFIX, *suffix);
331 static int do_ossl_trace_init(void)
333 trace_lock = CRYPTO_THREAD_lock_new();
334 return trace_lock != NULL;
339 void ossl_trace_cleanup(void)
341 #ifndef OPENSSL_NO_TRACE
344 const char *prefix = NULL;
345 const char *suffix = NULL;
347 for (category = 0; category < OSSL_TRACE_CATEGORY_NUM; category++) {
348 /* We force the TRACE category to be treated last */
349 if (category == OSSL_TRACE_CATEGORY_TRACE)
351 set_trace_data(category, 0, &channel, &prefix, &suffix,
352 trace_attach_cb, trace_detach_cb);
354 set_trace_data(OSSL_TRACE_CATEGORY_TRACE, 0, &channel,
356 trace_attach_cb, trace_detach_cb);
357 CRYPTO_THREAD_lock_free(trace_lock);
361 int OSSL_trace_set_channel(int category, BIO *channel)
363 #ifndef OPENSSL_NO_TRACE
364 if (category >= 0 && category < OSSL_TRACE_CATEGORY_NUM)
365 return set_trace_data(category, SIMPLE_CHANNEL, &channel, NULL, NULL,
366 trace_attach_cb, trace_detach_cb);
371 #ifndef OPENSSL_NO_TRACE
372 static int trace_attach_w_callback_cb(int category, int type, const void *data)
377 "Attach channel %p to category '%s' (with callback)\n",
378 data, trace_categories[category].name);
381 OSSL_TRACE2(TRACE, "Attach prefix \"%s\" to category '%s'\n",
382 (const char *)data, trace_categories[category].name);
385 OSSL_TRACE2(TRACE, "Attach suffix \"%s\" to category '%s'\n",
386 (const char *)data, trace_categories[category].name);
388 default: /* No clue */
395 int OSSL_trace_set_callback(int category, OSSL_trace_cb callback, void *data)
397 #ifndef OPENSSL_NO_TRACE
399 struct trace_data_st *trace_data = NULL;
401 if (category < 0 || category >= OSSL_TRACE_CATEGORY_NUM)
404 if (callback != NULL) {
405 if ((channel = BIO_new(&trace_method)) == NULL
407 OPENSSL_zalloc(sizeof(struct trace_data_st))) == NULL)
410 trace_data->callback = callback;
411 trace_data->category = category;
412 trace_data->data = data;
414 BIO_set_data(channel, trace_data);
417 if (!set_trace_data(category, CALLBACK_CHANNEL, &channel, NULL, NULL,
418 trace_attach_w_callback_cb, trace_detach_cb))
425 OPENSSL_free(trace_data);
431 int OSSL_trace_set_prefix(int category, const char *prefix)
433 #ifndef OPENSSL_NO_TRACE
434 if (category >= 0 && category < OSSL_TRACE_CATEGORY_NUM)
435 return set_trace_data(category, 0, NULL, &prefix, NULL,
436 trace_attach_cb, trace_detach_cb);
441 int OSSL_trace_set_suffix(int category, const char *suffix)
443 #ifndef OPENSSL_NO_TRACE
444 if (category >= 0 && category < OSSL_TRACE_CATEGORY_NUM)
445 return set_trace_data(category, 0, NULL, NULL, &suffix,
446 trace_attach_cb, trace_detach_cb);
451 #ifndef OPENSSL_NO_TRACE
452 static int ossl_trace_get_category(int category)
454 if (category < 0 || category >= OSSL_TRACE_CATEGORY_NUM)
456 if (trace_channels[category].bio != NULL)
458 return OSSL_TRACE_CATEGORY_ALL;
462 int OSSL_trace_enabled(int category)
465 #ifndef OPENSSL_NO_TRACE
466 category = ossl_trace_get_category(category);
468 ret = trace_channels[category].bio != NULL;
473 BIO *OSSL_trace_begin(int category)
476 #ifndef OPENSSL_NO_TRACE
479 category = ossl_trace_get_category(category);
483 channel = trace_channels[category].bio;
484 prefix = trace_channels[category].prefix;
486 if (channel != NULL) {
487 if (!CRYPTO_THREAD_write_lock(trace_lock))
489 current_channel = channel;
490 switch (trace_channels[category].type) {
492 if (prefix != NULL) {
493 (void)BIO_puts(channel, prefix);
494 (void)BIO_puts(channel, "\n");
497 case CALLBACK_CHANNEL:
498 (void)BIO_ctrl(channel, OSSL_TRACE_CTRL_BEGIN,
499 prefix == NULL ? 0 : strlen(prefix), prefix);
507 void OSSL_trace_end(int category, BIO * channel)
509 #ifndef OPENSSL_NO_TRACE
512 category = ossl_trace_get_category(category);
515 suffix = trace_channels[category].suffix;
517 && ossl_assert(channel == current_channel)) {
518 (void)BIO_flush(channel);
519 switch (trace_channels[category].type) {
521 if (suffix != NULL) {
522 (void)BIO_puts(channel, suffix);
523 (void)BIO_puts(channel, "\n");
526 case CALLBACK_CHANNEL:
527 (void)BIO_ctrl(channel, OSSL_TRACE_CTRL_END,
528 suffix == NULL ? 0 : strlen(suffix), suffix);
531 current_channel = NULL;
532 CRYPTO_THREAD_unlock(trace_lock);