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S/MIME: Canonicalize multi-part messages before hashing. Improve error checking in wc_MIME_parse_headers.

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This commit is contained in:
Kareem Abuobeid
2021-04-30 12:46:44 -07:00
parent e97692c521
commit 573d51966a
3 changed files with 89 additions and 14 deletions
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45
src/ssl.c
View File

@@ -54354,11 +54354,14 @@ WOLFSSL_API PKCS7* wolfSSL_SMIME_read_PKCS7(WOLFSSL_BIO* in,
int sectionLen = 0;
int ret = -1;
char* section = NULL;
char* canonLine = NULL;
char* canonSection = NULL;
PKCS7* pkcs7 = NULL;
word32 outLen = 0;
byte* out = NULL;
byte* outHead = NULL;
int canonPos = 0;
int lineLen = 0;
int remainLen = 0;
byte isEnd = 0;
@@ -54461,38 +54464,60 @@ WOLFSSL_API PKCS7* wolfSSL_SMIME_read_PKCS7(WOLFSSL_BIO* in,
section[0] = '\0';
sectionLen = 0;
canonSection = XMALLOC((remainLen+1)*sizeof(char), NULL,
DYNAMIC_TYPE_PKCS7);
if (canonSection == NULL) {
goto error;
}
lineLen = wolfSSL_BIO_gets(in, section, remainLen);
while(XSTRNCMP(&section[sectionLen], boundary, boundLen) &&
remainLen > 0) {
canonLine = wc_MIME_canonicalize(&section[sectionLen]);
if (canonLine == NULL) {
XFREE(canonSection, NULL, DYNAMIC_TYPE_PKCS7);
goto error;
}
XMEMCPY(&canonSection[canonPos], canonLine,
(int)XSTRLEN(canonLine));
canonPos += XSTRLEN(canonLine);
XFREE(canonLine, NULL, DYNAMIC_TYPE_PKCS7);
sectionLen += lineLen;
remainLen -= lineLen;
lineLen = wolfSSL_BIO_gets(in, &section[sectionLen],
remainLen);
if (lineLen <= 0) {
XFREE(canonSection, NULL, DYNAMIC_TYPE_PKCS7);
goto error;
}
}
sectionLen--;
canonPos--;
/* Strip the final trailing newline. Support \r, \n or \r\n. */
if (section[sectionLen] == '\n') {
sectionLen--;
if (section[sectionLen] == '\r') {
sectionLen--;
if (canonSection[canonPos] == '\n') {
canonPos--;
if (canonSection[canonPos] == '\r') {
canonPos--;
}
}
else if (section[sectionLen] == '\r') {
sectionLen--;
else if (canonSection[canonPos] == '\r') {
canonPos--;
}
section[sectionLen+1] = '\0';
canonSection[canonPos+1] = '\0';
*bcont = wolfSSL_BIO_new(wolfSSL_BIO_s_mem());
ret = wolfSSL_BIO_write(*bcont, section, (int)XSTRLEN(section));
if (ret != (int)XSTRLEN(section)) {
ret = wolfSSL_BIO_write(*bcont, canonSection,
(int)XSTRLEN(canonSection));
if (ret != (int)XSTRLEN(canonSection)) {
XFREE(canonSection, NULL, DYNAMIC_TYPE_PKCS7);
goto error;
}
if ((bcontMemSz = wolfSSL_BIO_get_mem_data(*bcont, &bcontMem)) < 0) {
goto error;
}
XFREE(canonSection, NULL, DYNAMIC_TYPE_PKCS7);
wc_MIME_free_hdrs(allHdrs);

57
wolfcrypt/src/asn.c
View File

@@ -18547,13 +18547,17 @@ int wc_MIME_parse_headers(char* in, int inLen, MimeHdr** headers)
}
start = end = 0;
lineLen = XSTRLEN(curLine);
if (lineLen == 0) {
ret = BAD_FUNC_ARG;
goto error;
}
for (pos = 0; pos < lineLen; pos++) {
char cur = curLine[pos];
if (mimeStatus == MIME_NAMEATTR && ((cur == ':' &&
mimeType == MIME_HDR) || (cur == '=' &&
mimeType == MIME_PARAM))) {
mimeType == MIME_PARAM)) && pos >= 1) {
mimeStatus = MIME_BODYVAL;
end = pos-1;
ret = wc_MIME_header_strip(curLine, &nameAttr, start, end);
@@ -18562,7 +18566,7 @@ int wc_MIME_parse_headers(char* in, int inLen, MimeHdr** headers)
}
start = pos+1;
}
else if (mimeStatus == MIME_BODYVAL && cur == ';') {
else if (mimeStatus == MIME_BODYVAL && cur == ';' && pos >= 1) {
end = pos-1;
ret = wc_MIME_header_strip(curLine, &bodyVal, start, end);
if (ret) {
@@ -18570,7 +18574,9 @@ int wc_MIME_parse_headers(char* in, int inLen, MimeHdr** headers)
}
if (mimeType == MIME_HDR) {
nextHdr->name = nameAttr;
nameAttr = NULL;
nextHdr->body = bodyVal;
bodyVal = NULL;
nextHdr->next = curHdr;
curHdr = nextHdr;
nextHdr = (MimeHdr*)XMALLOC(sizeof(MimeHdr), NULL,
@@ -18583,7 +18589,9 @@ int wc_MIME_parse_headers(char* in, int inLen, MimeHdr** headers)
}
else {
nextParam->attribute = nameAttr;
nameAttr = NULL;
nextParam->value = bodyVal;
bodyVal = NULL;
nextParam->next = curHdr->params;
curHdr->params = nextParam;
nextParam = (MimeParam*)XMALLOC(sizeof(MimeParam), NULL,
@@ -18612,7 +18620,9 @@ int wc_MIME_parse_headers(char* in, int inLen, MimeHdr** headers)
}
if (mimeType == MIME_HDR) {
nextHdr->name = nameAttr;
nameAttr = NULL;
nextHdr->body = bodyVal;
bodyVal = NULL;
nextHdr->next = curHdr;
curHdr = nextHdr;
nextHdr = (MimeHdr*)XMALLOC(sizeof(MimeHdr), NULL,
@@ -18624,7 +18634,9 @@ int wc_MIME_parse_headers(char* in, int inLen, MimeHdr** headers)
XMEMSET(nextHdr, 0, (word32)sizeof(MimeHdr));
} else {
nextParam->attribute = nameAttr;
nameAttr = NULL;
nextParam->value = bodyVal;
bodyVal = NULL;
nextParam->next = curHdr->params;
curHdr->params = nextParam;
nextParam = (MimeParam*)XMALLOC(sizeof(MimeParam), NULL,
@@ -18650,8 +18662,10 @@ int wc_MIME_parse_headers(char* in, int inLen, MimeHdr** headers)
error:
wc_MIME_free_hdrs(curHdr);
wc_MIME_free_hdrs(nextHdr);
XFREE(nameAttr, NULL, DYNAMIC_TYPE_PKCS7);
XFREE(bodyVal, NULL, DYNAMIC_TYPE_PKCS7);
if (nameAttr != NULL)
XFREE(nameAttr, NULL, DYNAMIC_TYPE_PKCS7);
if (bodyVal != NULL)
XFREE(bodyVal, NULL, DYNAMIC_TYPE_PKCS7);
XFREE(nextParam, NULL, DYNAMIC_TYPE_PKCS7);
return ret;
@@ -18742,6 +18756,41 @@ MimeParam* wc_MIME_find_param_attr(const char* attribute,
return param;
}
/*****************************************************************************
* wc_MIME_canonicalize - Canonicalize a line by converting all line endings
* to CRLF.
*
* RETURNS:
* returns a pointer to a canonicalized line on success, NULL on error.
*/
char* wc_MIME_canonicalize(const char* line)
{
size_t end = 0;
char* canonLine = NULL;
if (line == NULL || XSTRLEN(line) == 0) {
return NULL;
}
end = XSTRLEN(line);
while (end >= 1 && ((line[end-1] == '\r') || (line[end-1] == '\n'))) {
end--;
}
/* Need 2 chars for \r\n and 1 for EOL */
canonLine = (char*)XMALLOC((end+3)*sizeof(char), NULL, DYNAMIC_TYPE_PKCS7);
if (canonLine == NULL) {
return NULL;
}
XSTRNCPY(canonLine, line, end);
canonLine[end] = '\r';
canonLine[end+1] = '\n';
canonLine[end+2] = '\0';
return canonLine;
}
/*****************************************************************************
* wc_MIME_free_hdrs - Frees all MIME headers, parameters and strings starting from
* the provided header pointer.

1
wolfssl/wolfcrypt/asn.h
View File

@@ -1295,6 +1295,7 @@ WOLFSSL_LOCAL int wc_MIME_create_header(char* name, char* body, MimeHdr** hdr);
WOLFSSL_LOCAL int wc_MIME_create_parameter(char* attribute, char* value, MimeParam** param);
WOLFSSL_LOCAL MimeHdr* wc_MIME_find_header_name(const char* name, MimeHdr* hdr);
WOLFSSL_LOCAL MimeParam* wc_MIME_find_param_attr(const char* attribute, MimeParam* param);
WOLFSSL_LOCAL char* wc_MIME_canonicalize(const char* line);
WOLFSSL_LOCAL int wc_MIME_free_hdrs(MimeHdr* head);
#endif /* HAVE_SMIME */