[388] | 1 | /***************************************************************************
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| 2 | * _ _ ____ _
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| 3 | * Project ___| | | | _ \| |
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| 4 | * / __| | | | |_) | |
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| 5 | * | (__| |_| | _ <| |___
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| 6 | * \___|\___/|_| \_\_____|
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| 7 | *
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| 8 | * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
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| 9 | *
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| 10 | * This software is licensed as described in the file COPYING, which
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| 11 | * you should have received as part of this distribution. The terms
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| 12 | * are also available at https://curl.haxx.se/docs/copyright.html.
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| 13 | *
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| 14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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| 15 | * copies of the Software, and permit persons to whom the Software is
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| 16 | * furnished to do so, under the terms of the COPYING file.
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| 17 | *
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| 18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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| 19 | * KIND, either express or implied.
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| 20 | *
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| 21 | * RFC2195 CRAM-MD5 authentication
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| 22 | *
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| 23 | ***************************************************************************/
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| 24 |
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| 25 | #include "curl_setup.h"
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| 26 |
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| 27 | #if !defined(CURL_DISABLE_CRYPTO_AUTH)
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| 28 |
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| 29 | #include <curl/curl.h>
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| 30 | #include "urldata.h"
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| 31 |
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| 32 | #include "vauth/vauth.h"
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| 33 | #include "curl_base64.h"
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| 34 | #include "curl_hmac.h"
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| 35 | #include "curl_md5.h"
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| 36 | #include "warnless.h"
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| 37 | #include "curl_printf.h"
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| 38 |
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| 39 | /* The last #include files should be: */
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| 40 | #include "curl_memory.h"
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| 41 | #include "memdebug.h"
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| 42 |
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| 43 | /*
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| 44 | * Curl_auth_decode_cram_md5_message()
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| 45 | *
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| 46 | * This is used to decode an already encoded CRAM-MD5 challenge message.
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| 47 | *
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| 48 | * Parameters:
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| 49 | *
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| 50 | * chlg64 [in] - The base64 encoded challenge message.
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| 51 | * outptr [in/out] - The address where a pointer to newly allocated memory
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| 52 | * holding the result will be stored upon completion.
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| 53 | * outlen [out] - The length of the output message.
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| 54 | *
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| 55 | * Returns CURLE_OK on success.
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| 56 | */
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| 57 | CURLcode Curl_auth_decode_cram_md5_message(const char *chlg64, char **outptr,
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| 58 | size_t *outlen)
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| 59 | {
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| 60 | CURLcode result = CURLE_OK;
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| 61 | size_t chlg64len = strlen(chlg64);
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| 62 |
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| 63 | *outptr = NULL;
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| 64 | *outlen = 0;
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| 65 |
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| 66 | /* Decode the challenge if necessary */
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| 67 | if(chlg64len && *chlg64 != '=')
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| 68 | result = Curl_base64_decode(chlg64, (unsigned char **) outptr, outlen);
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| 69 |
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| 70 | return result;
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| 71 | }
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| 72 |
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| 73 | /*
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| 74 | * Curl_auth_create_cram_md5_message()
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| 75 | *
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| 76 | * This is used to generate an already encoded CRAM-MD5 response message ready
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| 77 | * for sending to the recipient.
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| 78 | *
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| 79 | * Parameters:
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| 80 | *
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| 81 | * data [in] - The session handle.
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| 82 | * chlg [in] - The challenge.
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| 83 | * userp [in] - The user name.
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| 84 | * passdwp [in] - The user's password.
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| 85 | * outptr [in/out] - The address where a pointer to newly allocated memory
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| 86 | * holding the result will be stored upon completion.
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| 87 | * outlen [out] - The length of the output message.
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| 88 | *
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| 89 | * Returns CURLE_OK on success.
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| 90 | */
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| 91 | CURLcode Curl_auth_create_cram_md5_message(struct Curl_easy *data,
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| 92 | const char *chlg,
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| 93 | const char *userp,
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| 94 | const char *passwdp,
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| 95 | char **outptr, size_t *outlen)
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| 96 | {
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| 97 | CURLcode result = CURLE_OK;
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| 98 | size_t chlglen = 0;
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| 99 | HMAC_context *ctxt;
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| 100 | unsigned char digest[MD5_DIGEST_LEN];
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| 101 | char *response;
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| 102 |
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| 103 | if(chlg)
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| 104 | chlglen = strlen(chlg);
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| 105 |
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| 106 | /* Compute the digest using the password as the key */
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| 107 | ctxt = Curl_HMAC_init(Curl_HMAC_MD5,
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| 108 | (const unsigned char *) passwdp,
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| 109 | curlx_uztoui(strlen(passwdp)));
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| 110 | if(!ctxt)
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| 111 | return CURLE_OUT_OF_MEMORY;
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| 112 |
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| 113 | /* Update the digest with the given challenge */
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| 114 | if(chlglen > 0)
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| 115 | Curl_HMAC_update(ctxt, (const unsigned char *) chlg,
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| 116 | curlx_uztoui(chlglen));
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| 117 |
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| 118 | /* Finalise the digest */
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| 119 | Curl_HMAC_final(ctxt, digest);
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| 120 |
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| 121 | /* Generate the response */
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| 122 | response = aprintf(
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| 123 | "%s %02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
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| 124 | userp, digest[0], digest[1], digest[2], digest[3], digest[4],
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| 125 | digest[5], digest[6], digest[7], digest[8], digest[9], digest[10],
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| 126 | digest[11], digest[12], digest[13], digest[14], digest[15]);
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| 127 | if(!response)
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| 128 | return CURLE_OUT_OF_MEMORY;
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| 129 |
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| 130 | /* Base64 encode the response */
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| 131 | result = Curl_base64_encode(data, response, 0, outptr, outlen);
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| 132 |
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| 133 | free(response);
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| 134 |
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| 135 | return result;
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| 136 | }
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| 137 |
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| 138 | #endif /* !CURL_DISABLE_CRYPTO_AUTH */
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