397 lines
12 KiB
C
397 lines
12 KiB
C
/*
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* Debugging routines
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*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "common.h"
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#if defined(MBEDTLS_DEBUG_C)
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#include "mbedtls/platform.h"
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#include "mbedtls/debug.h"
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#include "mbedtls/error.h"
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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/* DEBUG_BUF_SIZE must be at least 2 */
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#define DEBUG_BUF_SIZE 512
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static int debug_threshold = 0;
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void mbedtls_debug_set_threshold(int threshold)
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{
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debug_threshold = threshold;
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}
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/*
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* All calls to f_dbg must be made via this function
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*/
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static inline void debug_send_line(const mbedtls_ssl_context *ssl, int level,
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const char *file, int line,
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const char *str)
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{
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/*
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* If in a threaded environment, we need a thread identifier.
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* Since there is no portable way to get one, use the address of the ssl
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* context instead, as it shouldn't be shared between threads.
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*/
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#if defined(MBEDTLS_THREADING_C)
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char idstr[20 + DEBUG_BUF_SIZE]; /* 0x + 16 nibbles + ': ' */
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mbedtls_snprintf(idstr, sizeof(idstr), "%p: %s", (void *) ssl, str);
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ssl->conf->f_dbg(ssl->conf->p_dbg, level, file, line, idstr);
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#else
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ssl->conf->f_dbg(ssl->conf->p_dbg, level, file, line, str);
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#endif
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}
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MBEDTLS_PRINTF_ATTRIBUTE(5, 6)
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void mbedtls_debug_print_msg(const mbedtls_ssl_context *ssl, int level,
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const char *file, int line,
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const char *format, ...)
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{
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va_list argp;
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char str[DEBUG_BUF_SIZE];
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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MBEDTLS_STATIC_ASSERT(DEBUG_BUF_SIZE >= 2, "DEBUG_BUF_SIZE too small");
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if (NULL == ssl ||
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NULL == ssl->conf ||
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NULL == ssl->conf->f_dbg ||
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level > debug_threshold) {
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return;
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}
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va_start(argp, format);
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ret = mbedtls_vsnprintf(str, DEBUG_BUF_SIZE, format, argp);
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va_end(argp);
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if (ret < 0) {
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ret = 0;
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} else {
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if (ret >= DEBUG_BUF_SIZE - 1) {
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ret = DEBUG_BUF_SIZE - 2;
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}
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}
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str[ret] = '\n';
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str[ret + 1] = '\0';
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debug_send_line(ssl, level, file, line, str);
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}
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void mbedtls_debug_print_ret(const mbedtls_ssl_context *ssl, int level,
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const char *file, int line,
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const char *text, int ret)
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{
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char str[DEBUG_BUF_SIZE];
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if (NULL == ssl ||
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NULL == ssl->conf ||
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NULL == ssl->conf->f_dbg ||
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level > debug_threshold) {
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return;
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}
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/*
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* With non-blocking I/O and examples that just retry immediately,
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* the logs would be quickly flooded with WANT_READ, so ignore that.
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* Don't ignore WANT_WRITE however, since is is usually rare.
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*/
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if (ret == MBEDTLS_ERR_SSL_WANT_READ) {
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return;
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}
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mbedtls_snprintf(str, sizeof(str), "%s() returned %d (-0x%04x)\n",
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text, ret, (unsigned int) -ret);
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debug_send_line(ssl, level, file, line, str);
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}
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void mbedtls_debug_print_buf(const mbedtls_ssl_context *ssl, int level,
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const char *file, int line, const char *text,
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const unsigned char *buf, size_t len)
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{
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char str[DEBUG_BUF_SIZE];
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char txt[17];
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size_t i, idx = 0;
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if (NULL == ssl ||
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NULL == ssl->conf ||
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NULL == ssl->conf->f_dbg ||
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level > debug_threshold) {
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return;
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}
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mbedtls_snprintf(str + idx, sizeof(str) - idx, "dumping '%s' (%u bytes)\n",
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text, (unsigned int) len);
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debug_send_line(ssl, level, file, line, str);
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idx = 0;
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memset(txt, 0, sizeof(txt));
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for (i = 0; i < len; i++) {
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if (i >= 4096) {
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break;
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}
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if (i % 16 == 0) {
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if (i > 0) {
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mbedtls_snprintf(str + idx, sizeof(str) - idx, " %s\n", txt);
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debug_send_line(ssl, level, file, line, str);
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idx = 0;
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memset(txt, 0, sizeof(txt));
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}
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idx += mbedtls_snprintf(str + idx, sizeof(str) - idx, "%04x: ",
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(unsigned int) i);
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}
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idx += mbedtls_snprintf(str + idx, sizeof(str) - idx, " %02x",
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(unsigned int) buf[i]);
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txt[i % 16] = (buf[i] > 31 && buf[i] < 127) ? buf[i] : '.';
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}
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if (len > 0) {
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for (/* i = i */; i % 16 != 0; i++) {
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idx += mbedtls_snprintf(str + idx, sizeof(str) - idx, " ");
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}
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mbedtls_snprintf(str + idx, sizeof(str) - idx, " %s\n", txt);
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debug_send_line(ssl, level, file, line, str);
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}
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}
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#if defined(MBEDTLS_ECP_C)
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void mbedtls_debug_print_ecp(const mbedtls_ssl_context *ssl, int level,
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const char *file, int line,
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const char *text, const mbedtls_ecp_point *X)
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{
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char str[DEBUG_BUF_SIZE];
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if (NULL == ssl ||
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NULL == ssl->conf ||
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NULL == ssl->conf->f_dbg ||
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level > debug_threshold) {
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return;
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}
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mbedtls_snprintf(str, sizeof(str), "%s(X)", text);
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mbedtls_debug_print_mpi(ssl, level, file, line, str, &X->X);
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mbedtls_snprintf(str, sizeof(str), "%s(Y)", text);
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mbedtls_debug_print_mpi(ssl, level, file, line, str, &X->Y);
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}
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#endif /* MBEDTLS_ECP_C */
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#if defined(MBEDTLS_BIGNUM_C)
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void mbedtls_debug_print_mpi(const mbedtls_ssl_context *ssl, int level,
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const char *file, int line,
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const char *text, const mbedtls_mpi *X)
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{
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char str[DEBUG_BUF_SIZE];
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size_t bitlen;
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size_t idx = 0;
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if (NULL == ssl ||
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NULL == ssl->conf ||
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NULL == ssl->conf->f_dbg ||
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NULL == X ||
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level > debug_threshold) {
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return;
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}
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bitlen = mbedtls_mpi_bitlen(X);
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mbedtls_snprintf(str, sizeof(str), "value of '%s' (%u bits) is:\n",
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text, (unsigned) bitlen);
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debug_send_line(ssl, level, file, line, str);
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if (bitlen == 0) {
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str[0] = ' '; str[1] = '0'; str[2] = '0';
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idx = 3;
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} else {
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int n;
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for (n = (int) ((bitlen - 1) / 8); n >= 0; n--) {
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size_t limb_offset = n / sizeof(mbedtls_mpi_uint);
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size_t offset_in_limb = n % sizeof(mbedtls_mpi_uint);
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unsigned char octet =
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(X->p[limb_offset] >> (offset_in_limb * 8)) & 0xff;
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mbedtls_snprintf(str + idx, sizeof(str) - idx, " %02x", octet);
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idx += 3;
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/* Wrap lines after 16 octets that each take 3 columns */
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if (idx >= 3 * 16) {
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mbedtls_snprintf(str + idx, sizeof(str) - idx, "\n");
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debug_send_line(ssl, level, file, line, str);
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idx = 0;
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}
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}
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}
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if (idx != 0) {
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mbedtls_snprintf(str + idx, sizeof(str) - idx, "\n");
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debug_send_line(ssl, level, file, line, str);
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}
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}
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#endif /* MBEDTLS_BIGNUM_C */
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#if defined(MBEDTLS_X509_CRT_PARSE_C)
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static void debug_print_pk(const mbedtls_ssl_context *ssl, int level,
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const char *file, int line,
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const char *text, const mbedtls_pk_context *pk)
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{
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size_t i;
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mbedtls_pk_debug_item items[MBEDTLS_PK_DEBUG_MAX_ITEMS];
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char name[16];
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memset(items, 0, sizeof(items));
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if (mbedtls_pk_debug(pk, items) != 0) {
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debug_send_line(ssl, level, file, line,
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"invalid PK context\n");
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return;
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}
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for (i = 0; i < MBEDTLS_PK_DEBUG_MAX_ITEMS; i++) {
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if (items[i].type == MBEDTLS_PK_DEBUG_NONE) {
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return;
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}
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mbedtls_snprintf(name, sizeof(name), "%s%s", text, items[i].name);
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name[sizeof(name) - 1] = '\0';
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if (items[i].type == MBEDTLS_PK_DEBUG_MPI) {
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mbedtls_debug_print_mpi(ssl, level, file, line, name, items[i].value);
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} else
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#if defined(MBEDTLS_ECP_C)
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if (items[i].type == MBEDTLS_PK_DEBUG_ECP) {
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mbedtls_debug_print_ecp(ssl, level, file, line, name, items[i].value);
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} else
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#endif
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{ debug_send_line(ssl, level, file, line,
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"should not happen\n"); }
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}
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}
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static void debug_print_line_by_line(const mbedtls_ssl_context *ssl, int level,
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const char *file, int line, const char *text)
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{
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char str[DEBUG_BUF_SIZE];
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const char *start, *cur;
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start = text;
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for (cur = text; *cur != '\0'; cur++) {
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if (*cur == '\n') {
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size_t len = cur - start + 1;
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if (len > DEBUG_BUF_SIZE - 1) {
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len = DEBUG_BUF_SIZE - 1;
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}
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memcpy(str, start, len);
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str[len] = '\0';
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debug_send_line(ssl, level, file, line, str);
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start = cur + 1;
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}
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}
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}
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void mbedtls_debug_print_crt(const mbedtls_ssl_context *ssl, int level,
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const char *file, int line,
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const char *text, const mbedtls_x509_crt *crt)
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{
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char str[DEBUG_BUF_SIZE];
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int i = 0;
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if (NULL == ssl ||
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NULL == ssl->conf ||
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NULL == ssl->conf->f_dbg ||
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NULL == crt ||
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level > debug_threshold) {
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return;
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}
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while (crt != NULL) {
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char buf[1024];
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mbedtls_snprintf(str, sizeof(str), "%s #%d:\n", text, ++i);
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debug_send_line(ssl, level, file, line, str);
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mbedtls_x509_crt_info(buf, sizeof(buf) - 1, "", crt);
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debug_print_line_by_line(ssl, level, file, line, buf);
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debug_print_pk(ssl, level, file, line, "crt->", &crt->pk);
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crt = crt->next;
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}
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}
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#endif /* MBEDTLS_X509_CRT_PARSE_C */
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#if defined(MBEDTLS_ECDH_C)
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static void mbedtls_debug_printf_ecdh_internal(const mbedtls_ssl_context *ssl,
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int level, const char *file,
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int line,
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const mbedtls_ecdh_context *ecdh,
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mbedtls_debug_ecdh_attr attr)
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{
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#if defined(MBEDTLS_ECDH_LEGACY_CONTEXT)
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const mbedtls_ecdh_context *ctx = ecdh;
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#else
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const mbedtls_ecdh_context_mbed *ctx = &ecdh->ctx.mbed_ecdh;
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#endif
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switch (attr) {
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case MBEDTLS_DEBUG_ECDH_Q:
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mbedtls_debug_print_ecp(ssl, level, file, line, "ECDH: Q",
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&ctx->Q);
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break;
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case MBEDTLS_DEBUG_ECDH_QP:
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mbedtls_debug_print_ecp(ssl, level, file, line, "ECDH: Qp",
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&ctx->Qp);
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break;
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case MBEDTLS_DEBUG_ECDH_Z:
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mbedtls_debug_print_mpi(ssl, level, file, line, "ECDH: z",
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&ctx->z);
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break;
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default:
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break;
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}
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}
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void mbedtls_debug_printf_ecdh(const mbedtls_ssl_context *ssl, int level,
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const char *file, int line,
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const mbedtls_ecdh_context *ecdh,
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mbedtls_debug_ecdh_attr attr)
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{
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#if defined(MBEDTLS_ECDH_LEGACY_CONTEXT)
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mbedtls_debug_printf_ecdh_internal(ssl, level, file, line, ecdh, attr);
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#else
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switch (ecdh->var) {
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default:
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mbedtls_debug_printf_ecdh_internal(ssl, level, file, line, ecdh,
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attr);
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}
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#endif
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}
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#endif /* MBEDTLS_ECDH_C */
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#endif /* MBEDTLS_DEBUG_C */
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