/*
* Curl_auth_decode_digest_http_message()
*
* This is used to decode a HTTP DIGEST challenge message into the seperate
* attributes.
*
* Parameters:
*
* chlg [in] - The challenge message.
* digest [in/out] - The digest data struct being used and modified.
*
* Returns CURLE_OK on success.
*/
CURLcode Curl_auth_decode_digest_http_message(const char *chlg,
struct digestdata *digest)
{
bool before = FALSE; /* got a nonce before */
bool foundAuth = FALSE;
bool foundAuthInt = FALSE;
char *token = NULL;
char *tmp = NULL;
/* If we already have received a nonce, keep that in mind */
if(digest->nonce)
before = TRUE;
/* Clean up any former leftovers and initialise to defaults */
Curl_auth_digest_cleanup(digest);
for(;;) {
char value[DIGEST_MAX_VALUE_LENGTH];
char content[DIGEST_MAX_CONTENT_LENGTH];
/* Pass all additional spaces here */
while(*chlg && ISSPACE(*chlg))
chlg++;
/* Extract a value=content pair */
if(Curl_auth_digest_get_pair(chlg, value, content, &chlg)) {
if(Curl_raw_equal(value, "nonce")) {
free(digest->nonce);
digest->nonce = strdup(content);
if(!digest->nonce)
return CURLE_OUT_OF_MEMORY;
}
else if(Curl_raw_equal(value, "stale")) {
if(Curl_raw_equal(content, "true")) {
digest->stale = TRUE;
digest->nc = 1; /* we make a new nonce now */
}
}
else if(Curl_raw_equal(value, "realm")) {
free(digest->realm);
digest->realm = strdup(content);
if(!digest->realm)
return CURLE_OUT_OF_MEMORY;
}
else if(Curl_raw_equal(value, "opaque")) {
free(digest->opaque);
digest->opaque = strdup(content);
if(!digest->opaque)
return CURLE_OUT_OF_MEMORY;
}
else if(Curl_raw_equal(value, "qop")) {
char *tok_buf;
/* Tokenize the list and choose auth if possible, use a temporary
clone of the buffer since strtok_r() ruins it */
tmp = strdup(content);
if(!tmp)
return CURLE_OUT_OF_MEMORY;
token = strtok_r(tmp, ",", &tok_buf);
while(token != NULL) {
if(Curl_raw_equal(token, DIGEST_QOP_VALUE_STRING_AUTH)) {
foundAuth = TRUE;
}
else if(Curl_raw_equal(token, DIGEST_QOP_VALUE_STRING_AUTH_INT)) {
foundAuthInt = TRUE;
}
token = strtok_r(NULL, ",", &tok_buf);
}
free(tmp);
/* Select only auth or auth-int. Otherwise, ignore */
if(foundAuth) {
free(digest->qop);
digest->qop = strdup(DIGEST_QOP_VALUE_STRING_AUTH);
if(!digest->qop)
return CURLE_OUT_OF_MEMORY;
}
else if(foundAuthInt) {
free(digest->qop);
digest->qop = strdup(DIGEST_QOP_VALUE_STRING_AUTH_INT);
if(!digest->qop)
return CURLE_OUT_OF_MEMORY;
}
}
else if(Curl_raw_equal(value, "algorithm")) {
free(digest->algorithm);
digest->algorithm = strdup(content);
if(!digest->algorithm)
return CURLE_OUT_OF_MEMORY;
if(Curl_raw_equal(content, "MD5-sess"))
digest->algo = CURLDIGESTALGO_MD5SESS;
else if(Curl_raw_equal(content, "MD5"))
digest->algo = CURLDIGESTALGO_MD5;
else
return CURLE_BAD_CONTENT_ENCODING;
}
else {
/* Unknown specifier, ignore it! */
}
}
else
break; /* We're done here */
/* Pass all additional spaces here */
while(*chlg && ISSPACE(*chlg))
chlg++;
/* Allow the list to be comma-separated */
if(',' == *chlg)
chlg++;
}
/* We had a nonce since before, and we got another one now without
'stale=true'. This means we provided bad credentials in the previous
request */
if(before && !digest->stale)
return CURLE_BAD_CONTENT_ENCODING;
/* We got this header without a nonce, that's a bad Digest line! */
if(!digest->nonce)
return CURLE_BAD_CONTENT_ENCODING;
return CURLE_OK;
}
void Curl_digest_cleanup(struct Curl_easy *data)
{
Curl_auth_digest_cleanup(&data->state.digest);
Curl_auth_digest_cleanup(&data->state.proxydigest);
}