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gecko-dev/third_party/sipcc/sdp_utils.c

726 строки
20 KiB
C
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <errno.h>
#include <limits.h>
#include <ctype.h>
#include "sdp_os_defs.h"
#include "sipcc_sdp.h"
#include "sdp_private.h"
#include "sdp_log.h"
#define MKI_BUF_LEN 4
static const char* logTag = "sdp_utils";
// Actually checks for ASCII only unlike isdigit() on Windows.
// Also avoids UB issues with isdigit() sign extension when
// char is signed.
int sdp_is_ascii_digit(const char c) {
return '0' <= c && c <= '9';
}
sdp_mca_t *sdp_alloc_mca (uint32_t line) {
sdp_mca_t *mca_p;
/* Allocate resource for new media stream. */
mca_p = (sdp_mca_t *)SDP_MALLOC(sizeof(sdp_mca_t));
if (mca_p == NULL) {
return (NULL);
}
/* Initialize mca structure */
mca_p->media = SDP_MEDIA_INVALID;
mca_p->conn.nettype = SDP_NT_INVALID;
mca_p->conn.addrtype = SDP_AT_INVALID;
mca_p->conn.conn_addr[0] = '\0';
mca_p->conn.is_multicast = FALSE;
mca_p->conn.ttl = 0;
mca_p->conn.num_of_addresses = 0;
mca_p->transport = SDP_TRANSPORT_INVALID;
mca_p->port = SDP_INVALID_VALUE;
mca_p->num_ports = SDP_INVALID_VALUE;
mca_p->vpi = SDP_INVALID_VALUE;
mca_p->vci = 0;
mca_p->vcci = SDP_INVALID_VALUE;
mca_p->cid = SDP_INVALID_VALUE;
mca_p->num_payloads = 0;
mca_p->sessinfo_found = FALSE;
mca_p->encrypt.encrypt_type = SDP_ENCRYPT_INVALID;
mca_p->media_attrs_p = NULL;
mca_p->next_p = NULL;
mca_p->mid = 0;
mca_p->bw.bw_data_count = 0;
mca_p->bw.bw_data_list = NULL;
mca_p->line_number = line;
mca_p->sctp_fmt = SDP_SCTP_MEDIA_FMT_UNKNOWN;
return (mca_p);
}
/*
* next_token
*
* copy token param with chars from str until null, cr, lf, or one of the delimiters is found.
* delimiters at the beginning will be skipped.
* The pointer *string_of_tokens is moved forward to the next token on sucess.
*
*/
static sdp_result_e next_token(const char **string_of_tokens, char *token, unsigned token_max_len, const char *delim)
{
int flag2moveon = 0;
const char *str;
const char *token_end;
const char *next_delim;
if (!string_of_tokens || !*string_of_tokens || !token || !delim) {
return SDP_FAILURE;
}
str = *string_of_tokens;
token_end = token + token_max_len - 1;
/* Locate front of token, skipping any delimiters */
for ( ; ((*str != '\0') && (*str != '\n') && (*str != '\r')); str++) {
flag2moveon = 1; /* Default to move on unless we find a delimiter */
for (next_delim=delim; *next_delim; next_delim++) {
if (*str == *next_delim) {
flag2moveon = 0;
break;
}
}
if( flag2moveon ) {
break; /* We're at the beginning of the token */
}
}
/* Make sure there's really a token present. */
if ((*str == '\0') || (*str == '\n') || (*str == '\r')) {
return SDP_EMPTY_TOKEN;
}
/* Now locate end of token */
flag2moveon = 0;
while ((token < token_end) &&
(*str != '\0') && (*str != '\n') && (*str != '\r')) {
for (next_delim=delim; *next_delim; next_delim++) {
if (*str == *next_delim) {
flag2moveon = 1;
break;
}
}
if( flag2moveon ) {
break;
} else {
*token++ = *str++;
}
}
/* mark end of token */
*token = '\0';
/* set the string of tokens to the next token */
*string_of_tokens = str;
return SDP_SUCCESS;
}
/*
* verify_sdescriptions_mki
*
* Verifies the syntax of the MKI parameter.
*
* mki = mki-value ":" mki-length
* mki-value = 1*DIGIT
* mki-length = 1*3DIGIT ; range 1..128
*
* Inputs:
* buf - ptr to start of MKI string assumes NULL
* terminated string
* mkiValue - buffer to store the MKI value, assumes calling
* function has provided memory for this.
* mkiLen - integer to store the MKI length
*
* Outputs:
* Returns TRUE if syntax is correct and stores the
* MKI value in mkiVal and stores the length in mkiLen.
* Returns FALSE otherwise.
*/
tinybool
verify_sdescriptions_mki (char *buf, char *mkiVal, uint16_t *mkiLen)
{
char *ptr,
mkiValBuf[SDP_SRTP_MAX_MKI_SIZE_BYTES],
mkiLenBuf[MKI_BUF_LEN];
int idx = 0;
unsigned long strtoul_result;
char *strtoul_end;
ptr = buf;
/* MKI must begin with a digit */
if (!ptr || (!sdp_is_ascii_digit(*ptr))) {
return FALSE;
}
/* scan until we reach a non-digit or colon */
while (*ptr) {
if (*ptr == ':') {
/* terminate the MKI value */
mkiValBuf[idx] = 0;
ptr++;
break;
} else if ((sdp_is_ascii_digit(*ptr) && (idx < SDP_SRTP_MAX_MKI_SIZE_BYTES-1))) {
mkiValBuf[idx++] = *ptr;
} else {
return FALSE;
}
ptr++;
}
/* there has to be a mki length */
if (*ptr == 0) {
return FALSE;
}
idx = 0;
/* verify the mki length (max 3 digits) */
while (*ptr) {
if (sdp_is_ascii_digit(*ptr) && (idx < 3)) {
mkiLenBuf[idx++] = *ptr;
} else {
return FALSE;
}
ptr++;
}
mkiLenBuf[idx] = 0;
errno = 0;
strtoul_result = strtoul(mkiLenBuf, &strtoul_end, 10);
/* mki len must be between 1..128 */
if (errno || mkiLenBuf == strtoul_end || strtoul_result < 1 || strtoul_result > 128) {
*mkiLen = 0;
return FALSE;
}
*mkiLen = (uint16_t) strtoul_result;
sstrncpy(mkiVal, mkiValBuf, MKI_BUF_LEN);
return TRUE;
}
/*
* verify_srtp_lifetime
*
* Verifies the Lifetime parameter syntax.
*
* lifetime = ["2^"] 1*(DIGIT)
*
* Inputs:
* buf - pointer to start of lifetime string. Assumes string is
* NULL terminated.
* Outputs:
* Returns TRUE if syntax is correct. Returns FALSE otherwise.
*/
tinybool
verify_sdescriptions_lifetime (char *buf)
{
char *ptr;
tinybool tokenFound = FALSE;
ptr = buf;
if (!ptr || *ptr == 0) {
return FALSE;
}
while (*ptr) {
if (*ptr == '^') {
if (tokenFound) {
/* make sure we don't have multiple ^ */
return FALSE;
} else {
tokenFound = TRUE;
/* Lifetime is in power of 2 format, make sure first and second
* chars are 2^
*/
if (buf[0] != '2' || buf[1] != '^') {
return FALSE;
}
}
} else if (!sdp_is_ascii_digit(*ptr)) {
return FALSE;
}
ptr++;
}
/* Make sure if the format is 2^ that there is a number after the ^. */
if (tokenFound) {
if (strlen(buf) <= 2) {
return FALSE;
}
}
return TRUE;
}
/*
* sdp_validate_maxprate
*
* This function validates that the string passed in is of the form:
* packet-rate = 1*DIGIT ["." 1*DIGIT]
*/
tinybool
sdp_validate_maxprate(const char *string_parm)
{
tinybool retval = FALSE;
if (string_parm && (*string_parm)) {
while (sdp_is_ascii_digit(*string_parm)) {
string_parm++;
}
if (*string_parm == '.') {
string_parm++;
while (sdp_is_ascii_digit(*string_parm)) {
string_parm++;
}
}
if (*string_parm == '\0') {
retval = TRUE;
} else {
retval = FALSE;
}
}
return retval;
}
char *sdp_findchar (const char *ptr, char *char_list)
{
int i;
for (;*ptr != '\0'; ptr++) {
for (i=0; char_list[i] != '\0'; i++) {
if (*ptr == char_list[i]) {
return ((char *)ptr);
}
}
}
return ((char *)ptr);
}
/* Locate the next token in a line. The delim characters are passed in
* as a param. The token also will not go past a new line char or the
* end of the string. Skip any delimiters before the token.
*/
const char *sdp_getnextstrtok (const char *str, char *tokenstr, unsigned tokenstr_len,
const char *delim, sdp_result_e *result)
{
const char *token_list = str;
if (!str || !tokenstr || !delim || !result) {
if (result) {
*result = SDP_FAILURE;
}
return str;
}
*result = next_token(&token_list, tokenstr, tokenstr_len, delim);
return token_list;
}
/* Locate the next null ("-") or numeric token in a string. The delim
* characters are passed in as a param. The token also will not go past
* a new line char or the end of the string. Skip any delimiters before
* the token.
*/
uint32_t sdp_getnextnumtok_or_null (const char *str, const char **str_end,
const char *delim, tinybool *null_ind,
sdp_result_e *result)
{
const char *token_list = str;
char temp_token[SDP_MAX_STRING_LEN];
char *strtoul_end;
unsigned long numval;
if (null_ind) {
*null_ind = FALSE;
}
if (!str || !str_end || !delim || !null_ind || !result) {
if (result) {
*result = SDP_FAILURE;
}
return 0;
}
*result = next_token(&token_list, temp_token, sizeof(temp_token), delim);
if (*result != SDP_SUCCESS) {
return 0;
}
/* First see if its the null char ("-") */
if (temp_token[0] == '-') {
*null_ind = TRUE;
*result = SDP_SUCCESS;
*str_end = str;
return 0;
}
errno = 0;
numval = strtoul(temp_token, &strtoul_end, 10);
if (errno || strtoul_end == temp_token || numval > UINT_MAX) {
*result = SDP_FAILURE;
return 0;
}
*result = SDP_SUCCESS;
*str_end = token_list;
return (uint32_t) numval;
}
/* Locate the next numeric token in a string. The delim characters are
* passed in as a param. The token also will not go past a new line char
* or the end of the string. Skip any delimiters before the token.
*/
uint32_t sdp_getnextnumtok (const char *str, const char **str_end,
const char *delim, sdp_result_e *result)
{
const char *token_list = str;
char temp_token[SDP_MAX_STRING_LEN];
char *strtoul_end;
unsigned long numval;
if (!str || !str_end || !delim || !result) {
if (result) {
*result = SDP_FAILURE;
}
return 0;
}
*result = next_token(&token_list, temp_token, sizeof(temp_token), delim);
if (*result != SDP_SUCCESS) {
return 0;
}
errno = 0;
numval = strtoul(temp_token, &strtoul_end, 10);
if (errno || strtoul_end == temp_token || numval > UINT_MAX) {
*result = SDP_FAILURE;
return 0;
}
*result = SDP_SUCCESS;
*str_end = token_list;
return (uint32_t) numval;
}
/*
* SDP Crypto Utility Functions.
*
* First a few common definitions.
*/
/*
* Constants
*
* crypto_string = The string used to identify the start of sensative
* crypto data.
*
* inline_string = The string used to identify the start of key/salt
* crypto data.
*
* star_string = The string used to overwrite sensative data.
*
* '*_strlen' = The length of '*_string' in bytes (not including '\0')
*/
static const char crypto_string[] = "X-crypto:";
static const int crypto_strlen = sizeof(crypto_string) - 1;
static const char inline_string[] = "inline:";
static const int inline_strlen = sizeof(inline_string) - 1;
/* 40 characters is the current maximum for a Base64 encoded key/salt */
static const char star_string[] = "****************************************";
static const int star_strlen = sizeof(star_string) - 1;
/*
* MIN_CRYPTO_STRING_SIZE_BYTES = This value defines the minimum
* size of a string that could contain a key/salt. This value
* is used to skip out of parsing when there is no reasonable
* assumption that sensative data will be found. The general
* format of a SRTP Key Salt in SDP looks like:
*
* X-crypto:<crypto_suite_name> inline:<master_key_salt>||
*
* if <crypto_suite_name> and <master_key_salt> is at least
* one character and one space is used before the "inline:",
* then this translates to a size of (aligned by collumn from
* the format shown above):
*
* 9+ 1+ 1+7+ 1+ 2 = 21
*
*/
#define MIN_CRYPTO_STRING_SIZE_BYTES 21
/*
* Utility macros
*
* CHAR_IS_WHITESPACE = macro to determine if the passed _test_char
* is whitespace.
*
* SKIP_WHITESPACE = Macro to advance _cptr to the next non-whitespace
* character. _cptr will not be advanced past _max_cptr.
*
* FIND_WHITESPACE = Macro to advance _cptr until whitespace is found.
* _cptr will not be advanced past _max_cptr.
*/
#define CHAR_IS_WHITESPACE(_test_char) \
((((_test_char)==' ')||((_test_char)=='\t'))?1:0)
#define SKIP_WHITESPACE(_cptr, _max_cptr) \
while ((_cptr)<=(_max_cptr)) { \
if (!CHAR_IS_WHITESPACE(*(_cptr))) break; \
(_cptr)++; \
}
#define FIND_WHITESPACE(_cptr, _max_cptr) \
while ((_cptr)<=(_max_cptr)) { \
if (CHAR_IS_WHITESPACE(*(_cptr))) break; \
(_cptr)++; \
}
/* Function: sdp_crypto_debug
* Description: Check the passed buffer for sensitive data that should
* not be output (such as SRTP Master Key/Salt) and output
* the buffer as debug. Sensitive data will be replaced
* with the '*' character(s). This function may be used
* to display very large buffers so this function ensures
* that buginf is not overloaded.
* Parameters: buffer pointer to the message buffer to filter.
* length_bytes size of message buffer in bytes.
* Returns: Nothing.
*/
void sdp_crypto_debug (char *buffer, ulong length_bytes)
{
char *current, *start;
char *last = buffer + length_bytes;
int result;
/*
* For SRTP Master Key/Salt has the form:
* X-crypto:<crypto_suite_name> inline:<master_key_salt>||
* Where <master_key_salt> is the data to elide (filter).
*/
for (start=current=buffer;
current<=last-MIN_CRYPTO_STRING_SIZE_BYTES;
current++) {
if ((*current == 'x') || (*current == 'X')) {
result = cpr_strncasecmp(current, crypto_string, crypto_strlen);
if (!result) {
current += crypto_strlen;
if (current > last) break;
/* Skip over crypto suite name */
FIND_WHITESPACE(current, last);
/* Skip over whitespace */
SKIP_WHITESPACE(current, last);
/* identify inline keyword */
result = cpr_strncasecmp(current, inline_string, inline_strlen);
if (!result) {
int star_count = 0;
current += inline_strlen;
if (current > last) break;
sdp_dump_buffer(start, current - start);
/* Hide sensitive key/salt data */
while (current<=last) {
if (*current == '|' || *current == '\n') {
/* Done, print the stars */
while (star_count > star_strlen) {
/*
* This code is only for the case where
* too much base64 data was supplied
*/
sdp_dump_buffer((char*)star_string, star_strlen);
star_count -= star_strlen;
}
sdp_dump_buffer((char*)star_string, star_count);
break;
} else {
star_count++;
current++;
}
}
/* Update start pointer */
start=current;
}
}
}
}
if (last > start) {
/* Display remainder of buffer */
sdp_dump_buffer(start, last - start);
}
}
/*
* sdp_debug_msg_filter
*
* DESCRIPTION
* Check the passed message buffer for sensitive data that should
* not be output (such as SRTP Master Key/Salt). Sensitive data
* will be replaced with the '*' character(s).
*
* PARAMETERS
* buffer: pointer to the message buffer to filter.
*
* length_bytes: size of message buffer in bytes.
*
* RETURN VALUE
* The buffer modified.
*/
char * sdp_debug_msg_filter (char *buffer, ulong length_bytes)
{
char *current;
char *last = buffer + length_bytes;
int result;
SDP_PRINT("\n%s:%d: Eliding sensitive data from debug output",
__FILE__, __LINE__);
/*
* For SRTP Master Key/Salt has the form:
* X-crypto:<crypto_suite_name> inline:<master_key_salt>||
* Where <master_key_salt> is the data to elide (filter).
*/
for (current=buffer;
current<=last-MIN_CRYPTO_STRING_SIZE_BYTES;
current++) {
if ((*current == 'x') || (*current == 'X')) {
result = cpr_strncasecmp(current, crypto_string, crypto_strlen);
if (!result) {
current += crypto_strlen;
if (current > last) break;
/* Skip over crypto suite name */
FIND_WHITESPACE(current, last);
/* Skip over whitespace */
SKIP_WHITESPACE(current, last);
/* identify inline keyword */
result = cpr_strncasecmp(current, inline_string, inline_strlen);
if (!result) {
current += inline_strlen;
if (current > last) break;
/* Hide sensitive key/salt data */
while (current<=last) {
if (*current == '|' || *current == '\n') {
/* Done */
break;
} else {
*current = '*';
current++;
}
}
}
}
}
}
return buffer;
}
/* Function: sdp_checkrange
* Description: This checks the range of a ulong value to make sure its
* within the range of 0 and 4Gig. stroul cannot be used since
* for values greater greater than 4G, stroul will either wrap
* around or return ULONG_MAX.
* Parameters: sdp_p Pointer to the sdp structure
* num The number to check the range for
* u_val This variable get populated with the ulong value
* if the number is within the range.
* Returns: tinybool - returns TRUE if the number passed is within the
* range, FALSE otherwise
*/
tinybool sdp_checkrange (sdp_t *sdp_p, char *num, ulong *u_val)
{
ulong l_val;
char *endP = NULL;
*u_val = 0;
if (!num || !*num) {
return FALSE;
}
if (*num == '-') {
if (sdp_p->debug_flag[SDP_DEBUG_ERRORS]) {
SDPLogError(logTag, "%s ERROR: Parameter value is a negative number: %s",
sdp_p->debug_str, num);
}
return FALSE;
}
l_val = strtoul(num, &endP, 10);
if (*endP == '\0') {
if (l_val > 4294967295UL) {
if (sdp_p->debug_flag[SDP_DEBUG_ERRORS]) {
SDPLogError(logTag, "%s ERROR: Parameter value: %s is greater than 4294967295",
sdp_p->debug_str, num);
}
return FALSE;
}
if (l_val == 4294967295UL) {
/*
* On certain platforms where ULONG_MAX is equivalent to
* 4294967295, strtoul will return ULONG_MAX even if the the
* value of the string is greater than 4294967295. To detect
* that scenario we make an explicit check here.
*/
if (strcmp("4294967295", num)) {
if (sdp_p->debug_flag[SDP_DEBUG_ERRORS]) {
SDPLogError(logTag, "%s ERROR: Parameter value: %s is greater than 4294967295",
sdp_p->debug_str, num);
}
return FALSE;
}
}
}
*u_val = l_val;
return TRUE;
}
#undef CHAR_IS_WHITESPACE
#undef SKIP_WHITESPACE
#undef FIND_WHITESPACE
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