2 * Copyright 2019 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 <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"
20 #include "e_os.h" /* strcasecmp for Windows */
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 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),
137 const char *OSSL_trace_get_category_name(int num)
141 for (i = 0; i < OSSL_NELEM(trace_categories); i++)
142 if (trace_categories[i].num == num)
143 return trace_categories[i].name;
144 return NULL; /* not found */
147 int OSSL_trace_get_category_num(const char *name)
151 for (i = 0; i < OSSL_NELEM(trace_categories); i++)
152 if (strcasecmp(name, trace_categories[i].name) == 0)
153 return trace_categories[i].num;
154 return -1; /* not found */
157 #ifndef OPENSSL_NO_TRACE
159 /* We use one trace channel for each trace category */
161 enum { SIMPLE_CHANNEL, CALLBACK_CHANNEL } type;
165 } trace_channels[OSSL_TRACE_CATEGORY_NUM] = {
166 { 0, NULL, NULL, NULL },
171 #ifndef OPENSSL_NO_TRACE
179 static int trace_attach_cb(int category, int type, const void *data)
183 OSSL_TRACE2(TRACE, "Attach channel %p to category '%s'\n",
184 data, trace_categories[category].name);
187 OSSL_TRACE2(TRACE, "Attach prefix \"%s\" to category '%s'\n",
188 (const char *)data, trace_categories[category].name);
191 OSSL_TRACE2(TRACE, "Attach suffix \"%s\" to category '%s'\n",
192 (const char *)data, trace_categories[category].name);
194 default: /* No clue */
200 static int trace_detach_cb(int category, int type, const void *data)
204 OSSL_TRACE2(TRACE, "Detach channel %p from category '%s'\n",
205 data, trace_categories[category].name);
208 OSSL_TRACE2(TRACE, "Detach prefix \"%s\" from category '%s'\n",
209 (const char *)data, trace_categories[category].name);
212 OSSL_TRACE2(TRACE, "Detach suffix \"%s\" from category '%s'\n",
213 (const char *)data, trace_categories[category].name);
215 default: /* No clue */
221 static int set_trace_data(int category, int type, BIO **channel,
222 const char **prefix, const char **suffix,
223 int (*attach_cb)(int, int, const void *),
224 int (*detach_cb)(int, int, const void *))
226 BIO *curr_channel = NULL;
227 char *curr_prefix = NULL;
228 char *curr_suffix = NULL;
230 /* Ensure ossl_trace_init() is called */
231 OPENSSL_init_crypto(0, NULL);
233 curr_channel = trace_channels[category].bio;
234 curr_prefix = trace_channels[category].prefix;
235 curr_suffix = trace_channels[category].suffix;
237 /* Make sure to run the detach callback first on all data */
238 if (prefix != NULL && curr_prefix != NULL) {
239 detach_cb(category, PREFIX, curr_prefix);
242 if (suffix != NULL && curr_suffix != NULL) {
243 detach_cb(category, SUFFIX, curr_suffix);
246 if (channel != NULL && curr_channel != NULL) {
247 detach_cb(category, CHANNEL, curr_channel);
250 /* After detach callbacks are done, clear data where appropriate */
251 if (prefix != NULL && curr_prefix != NULL) {
252 OPENSSL_free(curr_prefix);
253 trace_channels[category].prefix = NULL;
256 if (suffix != NULL && curr_suffix != NULL) {
257 OPENSSL_free(curr_suffix);
258 trace_channels[category].suffix = NULL;
261 if (channel != NULL && curr_channel != NULL) {
262 BIO_free(curr_channel);
263 trace_channels[category].type = 0;
264 trace_channels[category].bio = NULL;
267 /* Before running callbacks are done, set new data where appropriate */
268 if (channel != NULL && *channel != NULL) {
269 trace_channels[category].type = type;
270 trace_channels[category].bio = *channel;
273 if (prefix != NULL && *prefix != NULL) {
274 if ((curr_prefix = OPENSSL_strdup(*prefix)) == NULL)
276 trace_channels[category].prefix = curr_prefix;
279 if (suffix != NULL && *suffix != NULL) {
280 if ((curr_suffix = OPENSSL_strdup(*suffix)) == NULL)
282 trace_channels[category].suffix = curr_suffix;
285 /* Finally, run the attach callback on the new data */
286 if (channel != NULL && *channel != NULL) {
287 attach_cb(category, CHANNEL, *channel);
290 if (prefix != NULL && *prefix != NULL) {
291 attach_cb(category, PREFIX, *prefix);
294 if (suffix != NULL && *suffix != NULL) {
295 attach_cb(category, SUFFIX, *suffix);
302 int ossl_trace_init(void)
304 #ifndef OPENSSL_NO_TRACE
305 trace_lock = CRYPTO_THREAD_lock_new();
306 if (trace_lock == NULL)
313 void ossl_trace_cleanup(void)
315 #ifndef OPENSSL_NO_TRACE
318 const char *prefix = NULL;
319 const char *suffix = NULL;
321 for (category = 0; category < OSSL_TRACE_CATEGORY_NUM; category++) {
322 /* We force the TRACE category to be treated last */
323 if (category == OSSL_TRACE_CATEGORY_TRACE)
325 set_trace_data(category, 0, &channel, &prefix, &suffix,
326 trace_attach_cb, trace_detach_cb);
328 set_trace_data(OSSL_TRACE_CATEGORY_TRACE, 0, &channel,
330 trace_attach_cb, trace_detach_cb);
331 CRYPTO_THREAD_lock_free(trace_lock);
335 int OSSL_trace_set_channel(int category, BIO *channel)
337 #ifndef OPENSSL_NO_TRACE
338 if (category >= 0 && category < OSSL_TRACE_CATEGORY_NUM)
339 return set_trace_data(category, SIMPLE_CHANNEL, &channel, NULL, NULL,
340 trace_attach_cb, trace_detach_cb);
345 #ifndef OPENSSL_NO_TRACE
346 static int trace_attach_w_callback_cb(int category, int type, const void *data)
351 "Attach channel %p to category '%s' (with callback)\n",
352 data, trace_categories[category].name);
355 OSSL_TRACE2(TRACE, "Attach prefix \"%s\" to category '%s'\n",
356 (const char *)data, trace_categories[category].name);
359 OSSL_TRACE2(TRACE, "Attach suffix \"%s\" to category '%s'\n",
360 (const char *)data, trace_categories[category].name);
362 default: /* No clue */
369 int OSSL_trace_set_callback(int category, OSSL_trace_cb callback, void *data)
371 #ifndef OPENSSL_NO_TRACE
373 struct trace_data_st *trace_data = NULL;
375 if (category < 0 || category >= OSSL_TRACE_CATEGORY_NUM)
378 if (callback != NULL) {
379 if ((channel = BIO_new(&trace_method)) == NULL
381 OPENSSL_zalloc(sizeof(struct trace_data_st))) == NULL)
384 trace_data->callback = callback;
385 trace_data->category = category;
386 trace_data->data = data;
388 BIO_set_data(channel, trace_data);
391 if (!set_trace_data(category, CALLBACK_CHANNEL, &channel, NULL, NULL,
392 trace_attach_w_callback_cb, trace_detach_cb))
399 OPENSSL_free(trace_data);
405 int OSSL_trace_set_prefix(int category, const char *prefix)
407 #ifndef OPENSSL_NO_TRACE
408 if (category >= 0 && category < OSSL_TRACE_CATEGORY_NUM)
409 return set_trace_data(category, 0, NULL, &prefix, NULL,
410 trace_attach_cb, trace_detach_cb);
415 int OSSL_trace_set_suffix(int category, const char *suffix)
417 #ifndef OPENSSL_NO_TRACE
418 if (category >= 0 && category < OSSL_TRACE_CATEGORY_NUM)
419 return set_trace_data(category, 0, NULL, NULL, &suffix,
420 trace_attach_cb, trace_detach_cb);
425 #ifndef OPENSSL_NO_TRACE
426 static int ossl_trace_get_category(int category)
428 if (category < 0 || category >= OSSL_TRACE_CATEGORY_NUM)
430 if (trace_channels[category].bio != NULL)
432 return OSSL_TRACE_CATEGORY_ALL;
436 int OSSL_trace_enabled(int category)
439 #ifndef OPENSSL_NO_TRACE
440 category = ossl_trace_get_category(category);
442 ret = trace_channels[category].bio != NULL;
447 BIO *OSSL_trace_begin(int category)
450 #ifndef OPENSSL_NO_TRACE
453 category = ossl_trace_get_category(category);
457 channel = trace_channels[category].bio;
458 prefix = trace_channels[category].prefix;
460 if (channel != NULL) {
461 CRYPTO_THREAD_write_lock(trace_lock);
462 current_channel = channel;
463 switch (trace_channels[category].type) {
465 if (prefix != NULL) {
466 (void)BIO_puts(channel, prefix);
467 (void)BIO_puts(channel, "\n");
470 case CALLBACK_CHANNEL:
471 (void)BIO_ctrl(channel, OSSL_TRACE_CTRL_BEGIN,
472 prefix == NULL ? 0 : strlen(prefix), prefix);
480 void OSSL_trace_end(int category, BIO * channel)
482 #ifndef OPENSSL_NO_TRACE
485 category = ossl_trace_get_category(category);
486 suffix = trace_channels[category].suffix;
488 && ossl_assert(channel == current_channel)) {
489 (void)BIO_flush(channel);
490 switch (trace_channels[category].type) {
492 if (suffix != NULL) {
493 (void)BIO_puts(channel, suffix);
494 (void)BIO_puts(channel, "\n");
497 case CALLBACK_CHANNEL:
498 (void)BIO_ctrl(channel, OSSL_TRACE_CTRL_END,
499 suffix == NULL ? 0 : strlen(suffix), suffix);
502 current_channel = NULL;
503 CRYPTO_THREAD_unlock(trace_lock);