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