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proxmark3/common/mbedtls/debug.c
Philippe Teuwen b1d6eaf2f7 mbedtls: make style
2021-05-14 14:07:59 +02:00

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/*
* Debugging routines
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "common.h"
#if defined(MBEDTLS_DEBUG_C)
#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#include <stdlib.h>
#define mbedtls_calloc calloc
#define mbedtls_free free
#define mbedtls_time_t time_t
#define mbedtls_snprintf snprintf
#define mbedtls_vsnprintf vsnprintf
#endif
#include "mbedtls/debug.h"
#include "mbedtls/error.h"
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && \
!defined(inline) && !defined(__cplusplus)
#define inline __inline
#endif
#define DEBUG_BUF_SIZE 512
static int debug_threshold = 0;
void mbedtls_debug_set_threshold(int threshold) {
debug_threshold = threshold;
}
/*
* All calls to f_dbg must be made via this function
*/
static inline void debug_send_line(const mbedtls_ssl_context *ssl, int level,
const char *file, int line,
const char *str) {
/*
* If in a threaded environment, we need a thread identifier.
* Since there is no portable way to get one, use the address of the ssl
* context instead, as it shouldn't be shared between threads.
*/
#if defined(MBEDTLS_THREADING_C)
char idstr[20 + DEBUG_BUF_SIZE]; /* 0x + 16 nibbles + ': ' */
mbedtls_snprintf(idstr, sizeof(idstr), "%p: %s", (void *)ssl, str);
ssl->conf->f_dbg(ssl->conf->p_dbg, level, file, line, idstr);
#else
ssl->conf->f_dbg(ssl->conf->p_dbg, level, file, line, str);
#endif
}
MBEDTLS_PRINTF_ATTRIBUTE(5, 6)
void mbedtls_debug_print_msg(const mbedtls_ssl_context *ssl, int level,
const char *file, int line,
const char *format, ...) {
va_list argp;
char str[DEBUG_BUF_SIZE];
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
if (NULL == ssl ||
NULL == ssl->conf ||
NULL == ssl->conf->f_dbg ||
level > debug_threshold) {
return;
}
va_start(argp, format);
ret = mbedtls_vsnprintf(str, DEBUG_BUF_SIZE, format, argp);
va_end(argp);
if (ret >= 0 && ret < DEBUG_BUF_SIZE - 1) {
str[ret] = '\n';
str[ret + 1] = '\0';
}
debug_send_line(ssl, level, file, line, str);
}
void mbedtls_debug_print_ret(const mbedtls_ssl_context *ssl, int level,
const char *file, int line,
const char *text, int ret) {
char str[DEBUG_BUF_SIZE];
if (NULL == ssl ||
NULL == ssl->conf ||
NULL == ssl->conf->f_dbg ||
level > debug_threshold) {
return;
}
/*
* With non-blocking I/O and examples that just retry immediately,
* the logs would be quickly flooded with WANT_READ, so ignore that.
* Don't ignore WANT_WRITE however, since is is usually rare.
*/
if (ret == MBEDTLS_ERR_SSL_WANT_READ)
return;
mbedtls_snprintf(str, sizeof(str), "%s() returned %d (-0x%04x)\n",
text, ret, (unsigned int) - ret);
debug_send_line(ssl, level, file, line, str);
}
void mbedtls_debug_print_buf(const mbedtls_ssl_context *ssl, int level,
const char *file, int line, const char *text,
const unsigned char *buf, size_t len) {
char str[DEBUG_BUF_SIZE];
char txt[17];
size_t i, idx = 0;
if (NULL == ssl ||
NULL == ssl->conf ||
NULL == ssl->conf->f_dbg ||
level > debug_threshold) {
return;
}
mbedtls_snprintf(str + idx, sizeof(str) - idx, "dumping '%s' (%u bytes)\n",
text, (unsigned int) len);
debug_send_line(ssl, level, file, line, str);
idx = 0;
memset(txt, 0, sizeof(txt));
for (i = 0; i < len; i++) {
if (i >= 4096)
break;
if (i % 16 == 0) {
if (i > 0) {
mbedtls_snprintf(str + idx, sizeof(str) - idx, " %s\n", txt);
debug_send_line(ssl, level, file, line, str);
idx = 0;
memset(txt, 0, sizeof(txt));
}
idx += mbedtls_snprintf(str + idx, sizeof(str) - idx, "%04x: ",
(unsigned int) i);
}
idx += mbedtls_snprintf(str + idx, sizeof(str) - idx, " %02x",
(unsigned int) buf[i]);
txt[i % 16] = (buf[i] > 31 && buf[i] < 127) ? buf[i] : '.' ;
}
if (len > 0) {
for (/* i = i */; i % 16 != 0; i++)
idx += mbedtls_snprintf(str + idx, sizeof(str) - idx, " ");
mbedtls_snprintf(str + idx, sizeof(str) - idx, " %s\n", txt);
debug_send_line(ssl, level, file, line, str);
}
}
#if defined(MBEDTLS_ECP_C)
void mbedtls_debug_print_ecp(const mbedtls_ssl_context *ssl, int level,
const char *file, int line,
const char *text, const mbedtls_ecp_point *X) {
char str[DEBUG_BUF_SIZE];
if (NULL == ssl ||
NULL == ssl->conf ||
NULL == ssl->conf->f_dbg ||
level > debug_threshold) {
return;
}
mbedtls_snprintf(str, sizeof(str), "%s(X)", text);
mbedtls_debug_print_mpi(ssl, level, file, line, str, &X->X);
mbedtls_snprintf(str, sizeof(str), "%s(Y)", text);
mbedtls_debug_print_mpi(ssl, level, file, line, str, &X->Y);
}
#endif /* MBEDTLS_ECP_C */
#if defined(MBEDTLS_BIGNUM_C)
void mbedtls_debug_print_mpi(const mbedtls_ssl_context *ssl, int level,
const char *file, int line,
const char *text, const mbedtls_mpi *X) {
char str[DEBUG_BUF_SIZE];
int j, k, zeros = 1;
size_t i, n, idx = 0;
if (NULL == ssl ||
NULL == ssl->conf ||
NULL == ssl->conf->f_dbg ||
NULL == X ||
level > debug_threshold) {
return;
}
for (n = X->n - 1; n > 0; n--)
if (X->p[n] != 0)
break;
for (j = (sizeof(mbedtls_mpi_uint) << 3) - 1; j >= 0; j--)
if (((X->p[n] >> j) & 1) != 0)
break;
mbedtls_snprintf(str + idx, sizeof(str) - idx, "value of '%s' (%d bits) is:\n",
text, (int)((n * (sizeof(mbedtls_mpi_uint) << 3)) + j + 1));
debug_send_line(ssl, level, file, line, str);
idx = 0;
for (i = n + 1, j = 0; i > 0; i--) {
if (zeros && X->p[i - 1] == 0)
continue;
for (k = sizeof(mbedtls_mpi_uint) - 1; k >= 0; k--) {
if (zeros && ((X->p[i - 1] >> (k << 3)) & 0xFF) == 0)
continue;
else
zeros = 0;
if (j % 16 == 0) {
if (j > 0) {
mbedtls_snprintf(str + idx, sizeof(str) - idx, "\n");
debug_send_line(ssl, level, file, line, str);
idx = 0;
}
}
idx += mbedtls_snprintf(str + idx, sizeof(str) - idx, " %02x", (unsigned int)
(X->p[i - 1] >> (k << 3)) & 0xFF);
j++;
}
}
if (zeros == 1)
idx += mbedtls_snprintf(str + idx, sizeof(str) - idx, " 00");
mbedtls_snprintf(str + idx, sizeof(str) - idx, "\n");
debug_send_line(ssl, level, file, line, str);
}
#endif /* MBEDTLS_BIGNUM_C */
#if defined(MBEDTLS_X509_CRT_PARSE_C)
static void debug_print_pk(const mbedtls_ssl_context *ssl, int level,
const char *file, int line,
const char *text, const mbedtls_pk_context *pk) {
size_t i;
mbedtls_pk_debug_item items[MBEDTLS_PK_DEBUG_MAX_ITEMS];
char name[16];
memset(items, 0, sizeof(items));
if (mbedtls_pk_debug(pk, items) != 0) {
debug_send_line(ssl, level, file, line,
"invalid PK context\n");
return;
}
for (i = 0; i < MBEDTLS_PK_DEBUG_MAX_ITEMS; i++) {
if (items[i].type == MBEDTLS_PK_DEBUG_NONE)
return;
mbedtls_snprintf(name, sizeof(name), "%s%s", text, items[i].name);
name[sizeof(name) - 1] = '\0';
if (items[i].type == MBEDTLS_PK_DEBUG_MPI)
mbedtls_debug_print_mpi(ssl, level, file, line, name, items[i].value);
else
#if defined(MBEDTLS_ECP_C)
if (items[i].type == MBEDTLS_PK_DEBUG_ECP)
mbedtls_debug_print_ecp(ssl, level, file, line, name, items[i].value);
else
#endif
debug_send_line(ssl, level, file, line,
"should not happen\n");
}
}
static void debug_print_line_by_line(const mbedtls_ssl_context *ssl, int level,
const char *file, int line, const char *text) {
char str[DEBUG_BUF_SIZE];
const char *start, *cur;
start = text;
for (cur = text; *cur != '\0'; cur++) {
if (*cur == '\n') {
size_t len = cur - start + 1;
if (len > DEBUG_BUF_SIZE - 1)
len = DEBUG_BUF_SIZE - 1;
memcpy(str, start, len);
str[len] = '\0';
debug_send_line(ssl, level, file, line, str);
start = cur + 1;
}
}
}
void mbedtls_debug_print_crt(const mbedtls_ssl_context *ssl, int level,
const char *file, int line,
const char *text, const mbedtls_x509_crt *crt) {
char str[DEBUG_BUF_SIZE];
int i = 0;
if (NULL == ssl ||
NULL == ssl->conf ||
NULL == ssl->conf->f_dbg ||
NULL == crt ||
level > debug_threshold) {
return;
}
while (crt != NULL) {
char buf[1024];
mbedtls_snprintf(str, sizeof(str), "%s #%d:\n", text, ++i);
debug_send_line(ssl, level, file, line, str);
mbedtls_x509_crt_info(buf, sizeof(buf) - 1, "", crt);
debug_print_line_by_line(ssl, level, file, line, buf);
debug_print_pk(ssl, level, file, line, "crt->", &crt->pk);
crt = crt->next;
}
}
#endif /* MBEDTLS_X509_CRT_PARSE_C */
#if defined(MBEDTLS_ECDH_C)
static void mbedtls_debug_printf_ecdh_internal(const mbedtls_ssl_context *ssl,
int level, const char *file,
int line,
const mbedtls_ecdh_context *ecdh,
mbedtls_debug_ecdh_attr attr) {
#if defined(MBEDTLS_ECDH_LEGACY_CONTEXT)
const mbedtls_ecdh_context *ctx = ecdh;
#else
const mbedtls_ecdh_context_mbed *ctx = &ecdh->ctx.mbed_ecdh;
#endif
switch (attr) {
case MBEDTLS_DEBUG_ECDH_Q:
mbedtls_debug_print_ecp(ssl, level, file, line, "ECDH: Q",
&ctx->Q);
break;
case MBEDTLS_DEBUG_ECDH_QP:
mbedtls_debug_print_ecp(ssl, level, file, line, "ECDH: Qp",
&ctx->Qp);
break;
case MBEDTLS_DEBUG_ECDH_Z:
mbedtls_debug_print_mpi(ssl, level, file, line, "ECDH: z",
&ctx->z);
break;
default:
break;
}
}
void mbedtls_debug_printf_ecdh(const mbedtls_ssl_context *ssl, int level,
const char *file, int line,
const mbedtls_ecdh_context *ecdh,
mbedtls_debug_ecdh_attr attr) {
#if defined(MBEDTLS_ECDH_LEGACY_CONTEXT)
mbedtls_debug_printf_ecdh_internal(ssl, level, file, line, ecdh, attr);
#else
switch (ecdh->var) {
default:
mbedtls_debug_printf_ecdh_internal(ssl, level, file, line, ecdh,
attr);
}
#endif
}
#endif /* MBEDTLS_ECDH_C */
#endif /* MBEDTLS_DEBUG_C */
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