Annotation of embedaddon/curl/lib/vauth/cram.c, revision 1.1.1.1
1.1 misho 1: /***************************************************************************
2: * _ _ ____ _
3: * Project ___| | | | _ \| |
4: * / __| | | | |_) | |
5: * | (__| |_| | _ <| |___
6: * \___|\___/|_| \_\_____|
7: *
8: * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
9: *
10: * This software is licensed as described in the file COPYING, which
11: * you should have received as part of this distribution. The terms
12: * are also available at https://curl.haxx.se/docs/copyright.html.
13: *
14: * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15: * copies of the Software, and permit persons to whom the Software is
16: * furnished to do so, under the terms of the COPYING file.
17: *
18: * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19: * KIND, either express or implied.
20: *
21: * RFC2195 CRAM-MD5 authentication
22: *
23: ***************************************************************************/
24:
25: #include "curl_setup.h"
26:
27: #if !defined(CURL_DISABLE_CRYPTO_AUTH)
28:
29: #include <curl/curl.h>
30: #include "urldata.h"
31:
32: #include "vauth/vauth.h"
33: #include "curl_base64.h"
34: #include "curl_hmac.h"
35: #include "curl_md5.h"
36: #include "warnless.h"
37: #include "curl_printf.h"
38:
39: /* The last #include files should be: */
40: #include "curl_memory.h"
41: #include "memdebug.h"
42:
43: /*
44: * Curl_auth_decode_cram_md5_message()
45: *
46: * This is used to decode an already encoded CRAM-MD5 challenge message.
47: *
48: * Parameters:
49: *
50: * chlg64 [in] - The base64 encoded challenge message.
51: * outptr [in/out] - The address where a pointer to newly allocated memory
52: * holding the result will be stored upon completion.
53: * outlen [out] - The length of the output message.
54: *
55: * Returns CURLE_OK on success.
56: */
57: CURLcode Curl_auth_decode_cram_md5_message(const char *chlg64, char **outptr,
58: size_t *outlen)
59: {
60: CURLcode result = CURLE_OK;
61: size_t chlg64len = strlen(chlg64);
62:
63: *outptr = NULL;
64: *outlen = 0;
65:
66: /* Decode the challenge if necessary */
67: if(chlg64len && *chlg64 != '=')
68: result = Curl_base64_decode(chlg64, (unsigned char **) outptr, outlen);
69:
70: return result;
71: }
72:
73: /*
74: * Curl_auth_create_cram_md5_message()
75: *
76: * This is used to generate an already encoded CRAM-MD5 response message ready
77: * for sending to the recipient.
78: *
79: * Parameters:
80: *
81: * data [in] - The session handle.
82: * chlg [in] - The challenge.
83: * userp [in] - The user name.
84: * passwdp [in] - The user's password.
85: * outptr [in/out] - The address where a pointer to newly allocated memory
86: * holding the result will be stored upon completion.
87: * outlen [out] - The length of the output message.
88: *
89: * Returns CURLE_OK on success.
90: */
91: CURLcode Curl_auth_create_cram_md5_message(struct Curl_easy *data,
92: const char *chlg,
93: const char *userp,
94: const char *passwdp,
95: char **outptr, size_t *outlen)
96: {
97: CURLcode result = CURLE_OK;
98: size_t chlglen = 0;
99: HMAC_context *ctxt;
100: unsigned char digest[MD5_DIGEST_LEN];
101: char *response;
102:
103: if(chlg)
104: chlglen = strlen(chlg);
105:
106: /* Compute the digest using the password as the key */
107: ctxt = Curl_HMAC_init(Curl_HMAC_MD5,
108: (const unsigned char *) passwdp,
109: curlx_uztoui(strlen(passwdp)));
110: if(!ctxt)
111: return CURLE_OUT_OF_MEMORY;
112:
113: /* Update the digest with the given challenge */
114: if(chlglen > 0)
115: Curl_HMAC_update(ctxt, (const unsigned char *) chlg,
116: curlx_uztoui(chlglen));
117:
118: /* Finalise the digest */
119: Curl_HMAC_final(ctxt, digest);
120:
121: /* Generate the response */
122: response = aprintf(
123: "%s %02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
124: userp, digest[0], digest[1], digest[2], digest[3], digest[4],
125: digest[5], digest[6], digest[7], digest[8], digest[9], digest[10],
126: digest[11], digest[12], digest[13], digest[14], digest[15]);
127: if(!response)
128: return CURLE_OUT_OF_MEMORY;
129:
130: /* Base64 encode the response */
131: result = Curl_base64_encode(data, response, 0, outptr, outlen);
132:
133: free(response);
134:
135: return result;
136: }
137:
138: #endif /* !CURL_DISABLE_CRYPTO_AUTH */
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