/*
* Curl_sasl_create_digest_md5_message()
*
* This is used to generate an already encoded DIGEST-MD5 response message
* ready for sending to the recipient.
*
* Parameters:
*
* data [in] - The session handle.
* chlg64 [in] - Pointer to the base64 encoded challenge message.
* userp [in] - The user name.
* passdwp [in] - The user's password.
* service [in] - The service type such as www, smtp, pop or imap.
* outptr [in/out] - The address where a pointer to newly allocated memory
* holding the result will be stored upon completion.
* outlen [out] - The length of the output message.
*
* Returns CURLE_OK on success.
*/
CURLcode Curl_sasl_create_digest_md5_message(struct SessionHandle *data,
const char *chlg64,
const char *userp,
const char *passwdp,
const char *service,
char **outptr, size_t *outlen)
{
CURLcode result = CURLE_OK;
size_t i;
MD5_context *ctxt;
char *response = NULL;
unsigned char digest[MD5_DIGEST_LEN];
char HA1_hex[2 * MD5_DIGEST_LEN + 1];
char HA2_hex[2 * MD5_DIGEST_LEN + 1];
char resp_hash_hex[2 * MD5_DIGEST_LEN + 1];
char nonce[64];
char realm[128];
char algorithm[64];
char qop_options[64];
int qop_values;
char cnonce[33];
unsigned int entropy[4];
char nonceCount[] = "00000001";
char method[] = "AUTHENTICATE";
char qop[] = DIGEST_QOP_VALUE_STRING_AUTH;
char *spn = NULL;
/* Decode the challange message */
result = sasl_decode_digest_md5_message(chlg64, nonce, sizeof(nonce),
realm, sizeof(realm),
algorithm, sizeof(algorithm),
qop_options, sizeof(qop_options));
if(result)
return result;
/* We only support md5 sessions */
if(strcmp(algorithm, "md5-sess") != 0)
return CURLE_BAD_CONTENT_ENCODING;
/* Get the qop-values from the qop-options */
result = sasl_digest_get_qop_values(qop_options, &qop_values);
if(result)
return result;
/* We only support auth quality-of-protection */
if(!(qop_values & DIGEST_QOP_VALUE_AUTH))
return CURLE_BAD_CONTENT_ENCODING;
/* Generate 16 bytes of random data */
entropy[0] = Curl_rand(data);
entropy[1] = Curl_rand(data);
entropy[2] = Curl_rand(data);
entropy[3] = Curl_rand(data);
/* Convert the random data into a 32 byte hex string */
snprintf(cnonce, sizeof(cnonce), "%08x%08x%08x%08x",
entropy[0], entropy[1], entropy[2], entropy[3]);
/* So far so good, now calculate A1 and H(A1) according to RFC 2831 */
ctxt = Curl_MD5_init(Curl_DIGEST_MD5);
if(!ctxt)
return CURLE_OUT_OF_MEMORY;
Curl_MD5_update(ctxt, (const unsigned char *) userp,
curlx_uztoui(strlen(userp)));
Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
Curl_MD5_update(ctxt, (const unsigned char *) realm,
curlx_uztoui(strlen(realm)));
Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
Curl_MD5_update(ctxt, (const unsigned char *) passwdp,
curlx_uztoui(strlen(passwdp)));
Curl_MD5_final(ctxt, digest);
ctxt = Curl_MD5_init(Curl_DIGEST_MD5);
if(!ctxt)
return CURLE_OUT_OF_MEMORY;
Curl_MD5_update(ctxt, (const unsigned char *) digest, MD5_DIGEST_LEN);
Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
Curl_MD5_update(ctxt, (const unsigned char *) nonce,
curlx_uztoui(strlen(nonce)));
Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
Curl_MD5_update(ctxt, (const unsigned char *) cnonce,
curlx_uztoui(strlen(cnonce)));
Curl_MD5_final(ctxt, digest);
/* Convert calculated 16 octet hex into 32 bytes string */
for(i = 0; i < MD5_DIGEST_LEN; i++)
snprintf(&HA1_hex[2 * i], 3, "%02x", digest[i]);
/* Generate our SPN */
spn = Curl_sasl_build_spn(service, realm);
if(!spn)
return CURLE_OUT_OF_MEMORY;
/* Calculate H(A2) */
ctxt = Curl_MD5_init(Curl_DIGEST_MD5);
if(!ctxt) {
Curl_safefree(spn);
return CURLE_OUT_OF_MEMORY;
}
Curl_MD5_update(ctxt, (const unsigned char *) method,
curlx_uztoui(strlen(method)));
Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
Curl_MD5_update(ctxt, (const unsigned char *) spn,
curlx_uztoui(strlen(spn)));
Curl_MD5_final(ctxt, digest);
for(i = 0; i < MD5_DIGEST_LEN; i++)
snprintf(&HA2_hex[2 * i], 3, "%02x", digest[i]);
/* Now calculate the response hash */
ctxt = Curl_MD5_init(Curl_DIGEST_MD5);
if(!ctxt) {
Curl_safefree(spn);
return CURLE_OUT_OF_MEMORY;
}
Curl_MD5_update(ctxt, (const unsigned char *) HA1_hex, 2 * MD5_DIGEST_LEN);
Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
Curl_MD5_update(ctxt, (const unsigned char *) nonce,
curlx_uztoui(strlen(nonce)));
Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
Curl_MD5_update(ctxt, (const unsigned char *) nonceCount,
curlx_uztoui(strlen(nonceCount)));
Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
Curl_MD5_update(ctxt, (const unsigned char *) cnonce,
curlx_uztoui(strlen(cnonce)));
Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
Curl_MD5_update(ctxt, (const unsigned char *) qop,
curlx_uztoui(strlen(qop)));
Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
Curl_MD5_update(ctxt, (const unsigned char *) HA2_hex, 2 * MD5_DIGEST_LEN);
Curl_MD5_final(ctxt, digest);
for(i = 0; i < MD5_DIGEST_LEN; i++)
snprintf(&resp_hash_hex[2 * i], 3, "%02x", digest[i]);
/* Generate the response */
response = aprintf("username=\"%s\",realm=\"%s\",nonce=\"%s\","
"cnonce=\"%s\",nc=\"%s\",digest-uri=\"%s\",response=%s,"
"qop=%s",
userp, realm, nonce,
cnonce, nonceCount, spn, resp_hash_hex, qop);
Curl_safefree(spn);
if(!response)
return CURLE_OUT_OF_MEMORY;
/* Base64 encode the response */
result = Curl_base64_encode(data, response, 0, outptr, outlen);
Curl_safefree(response);
return result;
}
/*
* Curl_sasl_create_digest_md5_message()
*
* This is used to generate an already encoded DIGEST-MD5 response message
* ready for sending to the recipient.
*
* Parameters:
*
* data [in] - The session handle.
* chlg64 [in] - Pointer to the base64 encoded challenge message.
* userp [in] - The user name.
* passdwp [in] - The user's password.
* service [in] - The service type such as www, smtp, pop or imap.
* outptr [in/out] - The address where a pointer to newly allocated memory
* holding the result will be stored upon completion.
* outlen [out] - The length of the output message.
*
* Returns CURLE_OK on success.
*/
CURLcode Curl_sasl_create_digest_md5_message(struct SessionHandle *data,
const char *chlg64,
const char *userp,
const char *passwdp,
const char *service,
char **outptr, size_t *outlen)
{
#ifndef DEBUGBUILD
static const char table16[] = "0123456789abcdef";
#endif
CURLcode result = CURLE_OK;
size_t i;
MD5_context *ctxt;
char *response = NULL;
unsigned char digest[MD5_DIGEST_LEN];
char HA1_hex[2 * MD5_DIGEST_LEN + 1];
char HA2_hex[2 * MD5_DIGEST_LEN + 1];
char resp_hash_hex[2 * MD5_DIGEST_LEN + 1];
char nonce[64];
char realm[128];
char algorithm[64];
char qop_options[64];
int qop_values;
char nonceCount[] = "00000001";
char cnonce[] = "12345678"; /* will be changed */
char method[] = "AUTHENTICATE";
char qop[] = DIGEST_QOP_VALUE_STRING_AUTH;
char uri[128];
/* Decode the challange message */
result = sasl_decode_digest_md5_message(chlg64, nonce, sizeof(nonce),
realm, sizeof(realm),
algorithm, sizeof(algorithm),
qop_options, sizeof(qop_options));
if(result)
return result;
/* We only support md5 sessions */
if(strcmp(algorithm, "md5-sess") != 0)
return CURLE_BAD_CONTENT_ENCODING;
/* Get the qop-values from the qop-options */
result = sasl_digest_get_qop_values(qop_options, &qop_values);
if(result)
return result;
/* We only support auth quality-of-protection */
if(!(qop_values & DIGEST_QOP_VALUE_AUTH))
return CURLE_BAD_CONTENT_ENCODING;
#ifndef DEBUGBUILD
/* Generate 64 bits of random data */
for(i = 0; i < 8; i++)
cnonce[i] = table16[Curl_rand(data)%16];
#endif
/* So far so good, now calculate A1 and H(A1) according to RFC 2831 */
ctxt = Curl_MD5_init(Curl_DIGEST_MD5);
if(!ctxt)
return CURLE_OUT_OF_MEMORY;
Curl_MD5_update(ctxt, (const unsigned char *) userp,
curlx_uztoui(strlen(userp)));
Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
Curl_MD5_update(ctxt, (const unsigned char *) realm,
curlx_uztoui(strlen(realm)));
Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
Curl_MD5_update(ctxt, (const unsigned char *) passwdp,
curlx_uztoui(strlen(passwdp)));
Curl_MD5_final(ctxt, digest);
ctxt = Curl_MD5_init(Curl_DIGEST_MD5);
if(!ctxt)
return CURLE_OUT_OF_MEMORY;
Curl_MD5_update(ctxt, (const unsigned char *) digest, MD5_DIGEST_LEN);
Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
Curl_MD5_update(ctxt, (const unsigned char *) nonce,
curlx_uztoui(strlen(nonce)));
Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
Curl_MD5_update(ctxt, (const unsigned char *) cnonce,
curlx_uztoui(strlen(cnonce)));
Curl_MD5_final(ctxt, digest);
/* Convert calculated 16 octet hex into 32 bytes string */
for(i = 0; i < MD5_DIGEST_LEN; i++)
snprintf(&HA1_hex[2 * i], 3, "%02x", digest[i]);
/* Prepare the URL string */
snprintf(uri, sizeof(uri), "%s/%s", service, realm);
/* Calculate H(A2) */
ctxt = Curl_MD5_init(Curl_DIGEST_MD5);
if(!ctxt)
return CURLE_OUT_OF_MEMORY;
Curl_MD5_update(ctxt, (const unsigned char *) method,
curlx_uztoui(strlen(method)));
Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
Curl_MD5_update(ctxt, (const unsigned char *) uri,
curlx_uztoui(strlen(uri)));
Curl_MD5_final(ctxt, digest);
for(i = 0; i < MD5_DIGEST_LEN; i++)
snprintf(&HA2_hex[2 * i], 3, "%02x", digest[i]);
/* Now calculate the response hash */
ctxt = Curl_MD5_init(Curl_DIGEST_MD5);
if(!ctxt)
return CURLE_OUT_OF_MEMORY;
Curl_MD5_update(ctxt, (const unsigned char *) HA1_hex, 2 * MD5_DIGEST_LEN);
Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
Curl_MD5_update(ctxt, (const unsigned char *) nonce,
curlx_uztoui(strlen(nonce)));
Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
Curl_MD5_update(ctxt, (const unsigned char *) nonceCount,
curlx_uztoui(strlen(nonceCount)));
Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
Curl_MD5_update(ctxt, (const unsigned char *) cnonce,
curlx_uztoui(strlen(cnonce)));
Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
Curl_MD5_update(ctxt, (const unsigned char *) qop,
curlx_uztoui(strlen(qop)));
Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
Curl_MD5_update(ctxt, (const unsigned char *) HA2_hex, 2 * MD5_DIGEST_LEN);
Curl_MD5_final(ctxt, digest);
for(i = 0; i < MD5_DIGEST_LEN; i++)
snprintf(&resp_hash_hex[2 * i], 3, "%02x", digest[i]);
/* Generate the response */
response = aprintf("username=\"%s\",realm=\"%s\",nonce=\"%s\","
"cnonce=\"%s\",nc=\"%s\",digest-uri=\"%s\",response=%s",
userp, realm, nonce,
cnonce, nonceCount, uri, resp_hash_hex);
if(!response)
return CURLE_OUT_OF_MEMORY;
/* Base64 encode the response */
result = Curl_base64_encode(data, response, 0, outptr, outlen);
Curl_safefree(response);
return result;
}
