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1 office 1 /*
2 * Copyright (c) 1997-1999 The Stanford SRP Authentication Project
3 * All Rights Reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining
6 * a copy of this software and associated documentation files (the
7 * "Software"), to deal in the Software without restriction, including
8 * without limitation the rights to use, copy, modify, merge, publish,
9 * distribute, sublicense, and/or sell copies of the Software, and to
10 * permit persons to whom the Software is furnished to do so, subject to
11 * the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be
14 * included in all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
17 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
18 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
19 *
20 * IN NO EVENT SHALL STANFORD BE LIABLE FOR ANY SPECIAL, INCIDENTAL,
21 * INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, OR ANY DAMAGES WHATSOEVER
22 * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER OR NOT ADVISED OF
23 * THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF LIABILITY, ARISING OUT
24 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
25 *
26 * In addition, the following conditions apply:
27 *
28 * 1. Any software that incorporates the SRP authentication technology
29 * must display the following acknowlegment:
30 * "This product uses the 'Secure Remote Password' cryptographic
31 * authentication system developed by Tom Wu (tjw@CS.Stanford.EDU)."
32 *
33 * 2. Any software that incorporates all or part of the SRP distribution
34 * itself must also display the following acknowledgment:
35 * "This product includes software developed by Tom Wu and Eugene
36 * Jhong for the SRP Distribution (http://srp.stanford.edu/srp/)."
37 *
38 * 3. Redistributions in source or binary form must retain an intact copy
39 * of this copyright notice and list of conditions.
40 */
41  
42 #ifndef T_SERVER_H
43 #define T_SERVER_H
44  
45 #include "t_sha.h"
46  
47 #if !defined(P)
48 #ifdef __STDC__
49 #define P(x) x
50 #else
51 #define P(x) ()
52 #endif
53 #endif
54  
55 #ifndef _DLLDECL
56 #define _DLLDECL
57  
58 #ifdef MSVC15 /* MSVC1.5 support for 16 bit apps */
59 #define _MSVC15EXPORT _export
60 #define _MSVC20EXPORT
61 #define _DLLAPI _export _pascal
62 #define _TYPE(a) a _MSVC15EXPORT
63 #define DLLEXPORT 1
64  
65 #elif MSVC20
66 #define _MSVC15EXPORT
67 #define _MSVC20EXPORT _declspec(dllexport)
68 #define _DLLAPI
69 #define _TYPE(a) _MSVC20EXPORT a
70 #define DLLEXPORT 1
71  
72 #else /* Default, non-dll. Use this for Unix or DOS */
73 #define _MSVC15DEXPORT
74 #define _MSVC20EXPORT
75 #define _DLLAPI
76 #define _TYPE(a) a
77 #endif
78 #endif
79  
80 #define BLEN 32
81  
82 struct t_server {
83 int index;
84 struct t_num n;
85 struct t_num g;
86 struct t_num v;
87 struct t_num s;
88  
89 struct t_num b;
90 struct t_num B;
91  
92 SHA1_CTX oldhash, hash, oldckhash, ckhash;
93  
94 unsigned char session_key[SESSION_KEY_LEN];
95 unsigned char session_response[RESPONSE_LEN];
96  
97 unsigned char nbuf[MAXPARAMLEN], gbuf[MAXPARAMLEN], vbuf[MAXPARAMLEN];
98 unsigned char saltbuf[MAXSALTLEN], bbuf[BLEN], Bbuf[MAXPARAMLEN];
99 };
100  
101 /*
102 * SRP server-side negotiation
103 *
104 * This code negotiates the server side of an SRP exchange.
105 * "t_serveropen" accepts a username (sent by the client), a pointer
106 * to an open password file, and a pointer to an open configuration
107 * file. The server should then call...
108 * "t_servergenexp" will generate a random 256-bit exponent and
109 * raise g (from the configuration file) to that power, returning
110 * the result. This result should be sent to the client as y(p).
111 * "t_servergetkey" accepts the exponential w(p), which should be
112 * sent by the client, and computes the 256-bit session key.
113 * This data should be saved before the session is closed.
114 * "t_serverresponse" computes the session key proof as SHA(w(p), K).
115 * "t_serverclose" closes the session and frees its memory.
116 *
117 * Note that authentication is not performed per se; it is up
118 * to either/both sides of the protocol to now verify securely
119 * that their session keys agree in order to establish authenticity.
120 * One possible way is through "oracle hashing"; one side sends
121 * r, the other replies with H(r,K), where H() is a hash function.
122 *
123 * t_serverresponse and t_serververify now implement a version of
124 * the session-key verification described above.
125 */
126 _TYPE( struct t_server * )
127 t_serveropen P((const char *));
128 _TYPE( struct t_server * )
129 t_serveropenfromfiles P((const char *, struct t_pw *, struct t_conf *));
130 _TYPE( struct t_server * )
131 t_serveropenraw P((struct t_pwent *, struct t_confent *));
132 _TYPE( struct t_num * ) t_servergenexp P((struct t_server *));
133 _TYPE( unsigned char * ) t_servergetkey P((struct t_server *, struct t_num *));
134 _TYPE( int ) t_serververify P((struct t_server *, unsigned char *));
135 _TYPE( unsigned char * ) t_serverresponse P((struct t_server *));
136 _TYPE( void ) t_serverclose P((struct t_server *));
137  
138 #endif