96 lines
3.0 KiB
C
96 lines
3.0 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 - 2021, 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.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_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_create_cram_md5_message()
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*
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* This is used to generate a CRAM-MD5 response message ready for sending to
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* the recipient.
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*
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* Parameters:
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*
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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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* out [out] - The result storage.
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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(const struct bufref *chlg,
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const char *userp,
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const char *passwdp,
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struct bufref *out)
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{
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struct HMAC_context *ctxt;
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unsigned char digest[MD5_DIGEST_LEN];
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char *response;
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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(Curl_bufref_len(chlg))
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Curl_HMAC_update(ctxt, Curl_bufref_ptr(chlg),
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curlx_uztoui(Curl_bufref_len(chlg)));
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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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Curl_bufref_set(out, response, strlen(response), curl_free);
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return CURLE_OK;
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}
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#endif /* !CURL_DISABLE_CRYPTO_AUTH */
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