| /*************************************************************************** |
| * _ _ ____ _ |
| * Project ___| | | | _ \| | |
| * / __| | | | |_) | | |
| * | (__| |_| | _ <| |___ |
| * \___|\___/|_| \_\_____| |
| * |
| * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al. |
| * |
| * This software is licensed as described in the file COPYING, which |
| * you should have received as part of this distribution. The terms |
| * are also available at https://curl.haxx.se/docs/copyright.html. |
| * |
| * You may opt to use, copy, modify, merge, publish, distribute and/or sell |
| * copies of the Software, and permit persons to whom the Software is |
| * furnished to do so, under the terms of the COPYING file. |
| * |
| * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY |
| * KIND, either express or implied. |
| * |
| * RFC2195 CRAM-MD5 authentication |
| * |
| ***************************************************************************/ |
| |
| #include "curl_setup.h" |
| |
| #if !defined(CURL_DISABLE_CRYPTO_AUTH) |
| |
| #include <curl/curl.h> |
| #include "urldata.h" |
| |
| #include "vauth/vauth.h" |
| #include "curl_base64.h" |
| #include "curl_hmac.h" |
| #include "curl_md5.h" |
| #include "warnless.h" |
| #include "curl_printf.h" |
| |
| /* The last #include files should be: */ |
| #include "curl_memory.h" |
| #include "memdebug.h" |
| |
| /* |
| * Curl_auth_decode_cram_md5_message() |
| * |
| * This is used to decode an already encoded CRAM-MD5 challenge message. |
| * |
| * Parameters: |
| * |
| * chlg64 [in] - The base64 encoded challenge message. |
| * 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_auth_decode_cram_md5_message(const char *chlg64, char **outptr, |
| size_t *outlen) |
| { |
| CURLcode result = CURLE_OK; |
| size_t chlg64len = strlen(chlg64); |
| |
| *outptr = NULL; |
| *outlen = 0; |
| |
| /* Decode the challenge if necessary */ |
| if(chlg64len && *chlg64 != '=') |
| result = Curl_base64_decode(chlg64, (unsigned char **) outptr, outlen); |
| |
| return result; |
| } |
| |
| /* |
| * Curl_auth_create_cram_md5_message() |
| * |
| * This is used to generate an already encoded CRAM-MD5 response message ready |
| * for sending to the recipient. |
| * |
| * Parameters: |
| * |
| * data [in] - The session handle. |
| * chlg [in] - The challenge. |
| * userp [in] - The user name. |
| * passdwp [in] - The user's password. |
| * 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_auth_create_cram_md5_message(struct Curl_easy *data, |
| const char *chlg, |
| const char *userp, |
| const char *passwdp, |
| char **outptr, size_t *outlen) |
| { |
| CURLcode result = CURLE_OK; |
| size_t chlglen = 0; |
| HMAC_context *ctxt; |
| unsigned char digest[MD5_DIGEST_LEN]; |
| char *response; |
| |
| if(chlg) |
| chlglen = strlen(chlg); |
| |
| /* Compute the digest using the password as the key */ |
| ctxt = Curl_HMAC_init(Curl_HMAC_MD5, |
| (const unsigned char *) passwdp, |
| curlx_uztoui(strlen(passwdp))); |
| if(!ctxt) |
| return CURLE_OUT_OF_MEMORY; |
| |
| /* Update the digest with the given challenge */ |
| if(chlglen > 0) |
| Curl_HMAC_update(ctxt, (const unsigned char *) chlg, |
| curlx_uztoui(chlglen)); |
| |
| /* Finalise the digest */ |
| Curl_HMAC_final(ctxt, digest); |
| |
| /* Generate the response */ |
| response = aprintf( |
| "%s %02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x", |
| userp, digest[0], digest[1], digest[2], digest[3], digest[4], |
| digest[5], digest[6], digest[7], digest[8], digest[9], digest[10], |
| digest[11], digest[12], digest[13], digest[14], digest[15]); |
| if(!response) |
| return CURLE_OUT_OF_MEMORY; |
| |
| /* Base64 encode the response */ |
| result = Curl_base64_encode(data, response, 0, outptr, outlen); |
| |
| free(response); |
| |
| return result; |
| } |
| |
| #endif /* !CURL_DISABLE_CRYPTO_AUTH */ |