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
122 trace_categories[OSSL_TRACE_CATEGORY_NUM] = {
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 TRACE_CATEGORY_(ENGINE_TABLE),
130 TRACE_CATEGORY_(ENGINE_REF_COUNT),
131 TRACE_CATEGORY_(PKCS5V2),
132 TRACE_CATEGORY_(PKCS12_KEYGEN),
133 TRACE_CATEGORY_(PKCS12_DECRYPT),
134 TRACE_CATEGORY_(X509V3_POLICY),
135 TRACE_CATEGORY_(BN_CTX),
136 TRACE_CATEGORY_(CMP),
137 TRACE_CATEGORY_(STORE),
138 TRACE_CATEGORY_(DECODER),
139 TRACE_CATEGORY_(ENCODER),
140 TRACE_CATEGORY_(REF_COUNT),
141 TRACE_CATEGORY_(HTTP),
142 }; /* KEEP THIS LIST IN SYNC with #define OSSL_TRACE_CATEGORY_... in trace.h */
144 const char *OSSL_trace_get_category_name(int num)
146 if (num < 0 || (size_t)num >= OSSL_NELEM(trace_categories))
149 * Partial check that OSSL_TRACE_CATEGORY_... macros
150 * are synced with trace_categories array
152 if (!ossl_assert(trace_categories[num].name != NULL)
153 || !ossl_assert(trace_categories[num].num == num))
155 return trace_categories[num].name;
158 int OSSL_trace_get_category_num(const char *name)
165 for (i = 0; i < OSSL_NELEM(trace_categories); i++)
166 if (OPENSSL_strcasecmp(name, trace_categories[i].name) == 0)
167 return trace_categories[i].num;
169 return -1; /* not found */
172 #ifndef OPENSSL_NO_TRACE
174 /* We use one trace channel for each trace category */
176 enum { SIMPLE_CHANNEL, CALLBACK_CHANNEL } type;
180 } trace_channels[OSSL_TRACE_CATEGORY_NUM] = {
181 { 0, NULL, NULL, NULL },
186 #ifndef OPENSSL_NO_TRACE
194 static int trace_attach_cb(int category, int type, const void *data)
198 OSSL_TRACE2(TRACE, "Attach channel %p to category '%s'\n",
199 data, trace_categories[category].name);
202 OSSL_TRACE2(TRACE, "Attach prefix \"%s\" to category '%s'\n",
203 (const char *)data, trace_categories[category].name);
206 OSSL_TRACE2(TRACE, "Attach suffix \"%s\" to category '%s'\n",
207 (const char *)data, trace_categories[category].name);
209 default: /* No clue */
215 static int trace_detach_cb(int category, int type, const void *data)
219 OSSL_TRACE2(TRACE, "Detach channel %p from category '%s'\n",
220 data, trace_categories[category].name);
223 OSSL_TRACE2(TRACE, "Detach prefix \"%s\" from category '%s'\n",
224 (const char *)data, trace_categories[category].name);
227 OSSL_TRACE2(TRACE, "Detach suffix \"%s\" from category '%s'\n",
228 (const char *)data, trace_categories[category].name);
230 default: /* No clue */
236 static int do_ossl_trace_init(void);
237 static CRYPTO_ONCE trace_inited = CRYPTO_ONCE_STATIC_INIT;
238 DEFINE_RUN_ONCE_STATIC(ossl_trace_init)
240 return do_ossl_trace_init();
243 static int set_trace_data(int category, int type, BIO **channel,
244 const char **prefix, const char **suffix,
245 int (*attach_cb)(int, int, const void *),
246 int (*detach_cb)(int, int, const void *))
248 BIO *curr_channel = NULL;
249 char *curr_prefix = NULL;
250 char *curr_suffix = NULL;
252 /* Ensure do_ossl_trace_init() is called once */
253 if (!RUN_ONCE(&trace_inited, ossl_trace_init))
256 curr_channel = trace_channels[category].bio;
257 curr_prefix = trace_channels[category].prefix;
258 curr_suffix = trace_channels[category].suffix;
260 /* Make sure to run the detach callback first on all data */
261 if (prefix != NULL && curr_prefix != NULL) {
262 detach_cb(category, PREFIX, curr_prefix);
265 if (suffix != NULL && curr_suffix != NULL) {
266 detach_cb(category, SUFFIX, curr_suffix);
269 if (channel != NULL && curr_channel != NULL) {
270 detach_cb(category, CHANNEL, curr_channel);
273 /* After detach callbacks are done, clear data where appropriate */
274 if (prefix != NULL && curr_prefix != NULL) {
275 OPENSSL_free(curr_prefix);
276 trace_channels[category].prefix = NULL;
279 if (suffix != NULL && curr_suffix != NULL) {
280 OPENSSL_free(curr_suffix);
281 trace_channels[category].suffix = NULL;
284 if (channel != NULL && curr_channel != NULL) {
285 BIO_free(curr_channel);
286 trace_channels[category].type = 0;
287 trace_channels[category].bio = NULL;
290 /* Before running callbacks are done, set new data where appropriate */
291 if (channel != NULL && *channel != NULL) {
292 trace_channels[category].type = type;
293 trace_channels[category].bio = *channel;
296 if (prefix != NULL && *prefix != NULL) {
297 if ((curr_prefix = OPENSSL_strdup(*prefix)) == NULL)
299 trace_channels[category].prefix = curr_prefix;
302 if (suffix != NULL && *suffix != NULL) {
303 if ((curr_suffix = OPENSSL_strdup(*suffix)) == NULL)
305 trace_channels[category].suffix = curr_suffix;
308 /* Finally, run the attach callback on the new data */
309 if (channel != NULL && *channel != NULL) {
310 attach_cb(category, CHANNEL, *channel);
313 if (prefix != NULL && *prefix != NULL) {
314 attach_cb(category, PREFIX, *prefix);
317 if (suffix != NULL && *suffix != NULL) {
318 attach_cb(category, SUFFIX, *suffix);
324 static int do_ossl_trace_init(void)
326 trace_lock = CRYPTO_THREAD_lock_new();
327 return trace_lock != NULL;
332 void ossl_trace_cleanup(void)
334 #ifndef OPENSSL_NO_TRACE
337 const char *prefix = NULL;
338 const char *suffix = NULL;
340 for (category = 0; category < OSSL_TRACE_CATEGORY_NUM; category++) {
341 /* We force the TRACE category to be treated last */
342 if (category == OSSL_TRACE_CATEGORY_TRACE)
344 set_trace_data(category, 0, &channel, &prefix, &suffix,
345 trace_attach_cb, trace_detach_cb);
347 set_trace_data(OSSL_TRACE_CATEGORY_TRACE, 0, &channel,
349 trace_attach_cb, trace_detach_cb);
350 CRYPTO_THREAD_lock_free(trace_lock);
354 int OSSL_trace_set_channel(int category, BIO *channel)
356 #ifndef OPENSSL_NO_TRACE
357 if (category >= 0 && category < OSSL_TRACE_CATEGORY_NUM)
358 return set_trace_data(category, SIMPLE_CHANNEL, &channel, NULL, NULL,
359 trace_attach_cb, trace_detach_cb);
364 #ifndef OPENSSL_NO_TRACE
365 static int trace_attach_w_callback_cb(int category, int type, const void *data)
370 "Attach channel %p to category '%s' (with callback)\n",
371 data, trace_categories[category].name);
374 OSSL_TRACE2(TRACE, "Attach prefix \"%s\" to category '%s'\n",
375 (const char *)data, trace_categories[category].name);
378 OSSL_TRACE2(TRACE, "Attach suffix \"%s\" to category '%s'\n",
379 (const char *)data, trace_categories[category].name);
381 default: /* No clue */
388 int OSSL_trace_set_callback(int category, OSSL_trace_cb callback, void *data)
390 #ifndef OPENSSL_NO_TRACE
392 struct trace_data_st *trace_data = NULL;
394 if (category < 0 || category >= OSSL_TRACE_CATEGORY_NUM)
397 if (callback != NULL) {
398 if ((channel = BIO_new(&trace_method)) == NULL
400 OPENSSL_zalloc(sizeof(struct trace_data_st))) == NULL)
403 trace_data->callback = callback;
404 trace_data->category = category;
405 trace_data->data = data;
407 BIO_set_data(channel, trace_data);
410 if (!set_trace_data(category, CALLBACK_CHANNEL, &channel, NULL, NULL,
411 trace_attach_w_callback_cb, trace_detach_cb))
418 OPENSSL_free(trace_data);
424 int OSSL_trace_set_prefix(int category, const char *prefix)
426 #ifndef OPENSSL_NO_TRACE
427 if (category >= 0 && category < OSSL_TRACE_CATEGORY_NUM)
428 return set_trace_data(category, 0, NULL, &prefix, NULL,
429 trace_attach_cb, trace_detach_cb);
434 int OSSL_trace_set_suffix(int category, const char *suffix)
436 #ifndef OPENSSL_NO_TRACE
437 if (category >= 0 && category < OSSL_TRACE_CATEGORY_NUM)
438 return set_trace_data(category, 0, NULL, NULL, &suffix,
439 trace_attach_cb, trace_detach_cb);
444 #ifndef OPENSSL_NO_TRACE
445 static int ossl_trace_get_category(int category)
447 if (category < 0 || category >= OSSL_TRACE_CATEGORY_NUM)
449 if (trace_channels[category].bio != NULL)
451 return OSSL_TRACE_CATEGORY_ALL;
455 int OSSL_trace_enabled(int category)
458 #ifndef OPENSSL_NO_TRACE
459 category = ossl_trace_get_category(category);
461 ret = trace_channels[category].bio != NULL;
466 BIO *OSSL_trace_begin(int category)
469 #ifndef OPENSSL_NO_TRACE
472 category = ossl_trace_get_category(category);
476 channel = trace_channels[category].bio;
477 prefix = trace_channels[category].prefix;
479 if (channel != NULL) {
480 if (!CRYPTO_THREAD_write_lock(trace_lock))
482 current_channel = channel;
483 switch (trace_channels[category].type) {
485 if (prefix != NULL) {
486 (void)BIO_puts(channel, prefix);
487 (void)BIO_puts(channel, "\n");
490 case CALLBACK_CHANNEL:
491 (void)BIO_ctrl(channel, OSSL_TRACE_CTRL_BEGIN,
492 prefix == NULL ? 0 : strlen(prefix), prefix);
500 void OSSL_trace_end(int category, BIO * channel)
502 #ifndef OPENSSL_NO_TRACE
505 category = ossl_trace_get_category(category);
508 suffix = trace_channels[category].suffix;
510 && ossl_assert(channel == current_channel)) {
511 (void)BIO_flush(channel);
512 switch (trace_channels[category].type) {
514 if (suffix != NULL) {
515 (void)BIO_puts(channel, suffix);
516 (void)BIO_puts(channel, "\n");
519 case CALLBACK_CHANNEL:
520 (void)BIO_ctrl(channel, OSSL_TRACE_CTRL_END,
521 suffix == NULL ? 0 : strlen(suffix), suffix);
524 current_channel = NULL;
525 CRYPTO_THREAD_unlock(trace_lock);