Root/package/ead/src/tinysrp/t_pwd.h

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_PWD_H
43#define T_PWD_H
44
45#ifndef P
46#if defined (__STDC__) || defined (__cplusplus)
47#define P(x) x
48#else
49#define P(x) ()
50#endif
51#endif
52
53/* For building dynamic link libraries under windows, windows NT
54 * using MSVC1.5 or MSVC2.0
55 */
56
57#ifndef _DLLDECL
58#define _DLLDECL
59
60#ifdef MSVC15 /* MSVC1.5 support for 16 bit apps */
61#define _MSVC15EXPORT _export
62#define _MSVC20EXPORT
63#define _DLLAPI _export _pascal
64#define _TYPE(a) a _MSVC15EXPORT
65#define DLLEXPORT 1
66
67#elif MSVC20
68#define _MSVC15EXPORT
69#define _MSVC20EXPORT _declspec(dllexport)
70#define _DLLAPI
71#define _TYPE(a) _MSVC20EXPORT a
72#define DLLEXPORT 1
73
74#else /* Default, non-dll. Use this for Unix or DOS */
75#define _MSVC15DEXPORT
76#define _MSVC20EXPORT
77#define _DLLAPI
78#define _TYPE(a) a
79#endif
80#endif
81
82#define MAXPARAMBITS 2048
83#define MAXPARAMLEN ((MAXPARAMBITS + 7) / 8)
84#define MAXB64PARAMLEN ((MAXPARAMBITS + 5) / 6 + 1)
85#define MAXHEXPARAMLEN ((MAXPARAMBITS + 3) / 4 + 1)
86#define MAXOCTPARAMLEN ((MAXPARAMBITS + 2) / 3 + 1)
87
88#define MAXUSERLEN 32
89#define MAXSALTLEN 32
90#define MAXB64SALTLEN 44 /* 256 bits in b64 + null */
91#define SALTLEN 10 /* Normally 80 bits */
92
93#define RESPONSE_LEN 20 /* 160-bit proof hashes */
94#define SESSION_KEY_LEN (2 * RESPONSE_LEN) /* 320-bit session key */
95
96#define DEFAULT_PASSWD "tpasswd"
97
98struct t_num { /* Standard byte-oriented integer representation */
99  int len;
100  unsigned char * data;
101};
102
103struct t_preconf { /* Structure returned by t_getpreparam() */
104  char * mod_b64;
105  char * gen_b64;
106  char * comment;
107
108  struct t_num modulus;
109  struct t_num generator;
110};
111
112/*
113 * The built-in (known good) parameters access routines
114 *
115 * "t_getprecount" returns the number of precompiled parameter sets.
116 * "t_getpreparam" returns the indicated parameter set.
117 * Memory is statically allocated - callers need not perform any memory mgmt.
118 */
119_TYPE( int ) t_getprecount();
120_TYPE( struct t_preconf * ) t_getpreparam P((int));
121
122struct t_confent { /* One configuration file entry (index, N, g) */
123  int index;
124  struct t_num modulus;
125  struct t_num generator;
126};
127
128struct t_conf { /* An open configuration file */
129  FILE * instream;
130  char close_on_exit;
131  unsigned char modbuf[MAXPARAMLEN];
132  unsigned char genbuf[MAXPARAMLEN];
133  struct t_confent tcbuf;
134};
135
136/*
137 * The configuration file routines are designed along the lines of the
138 * "getpw" functions in the standard C library.
139 *
140 * "t_openconf" accepts a stdio stream and interprets it as a config file.
141 * "t_openconfbyname" accepts a filename and does the same thing.
142 * "t_closeconf" closes the config file.
143 * "t_getconfent" fetches the next sequential configuration entry.
144 * "t_getconfbyindex" fetches the configuration entry whose index
145 * matches the one supplied, or NULL if one can't be found.
146 * "t_getconflast" fetches the last configuration entry in the file.
147 * "t_makeconfent" generates a set of configuration entry parameters
148 * randomly.
149 * "t_newconfent" returns an empty configuration entry.
150 * "t_cmpconfent" compares two configuration entries a la strcmp.
151 * "t_checkconfent" verifies that a set of configuration parameters
152 * are suitable. N must be prime and should be a safe prime.
153 * "t_putconfent" writes a configuration entry to a stream.
154 */
155_TYPE( struct t_conf * ) t_openconf P((FILE *));
156_TYPE( struct t_conf * ) t_openconfbyname P((const char *));
157_TYPE( void ) t_closeconf P((struct t_conf *));
158_TYPE( void ) t_rewindconf P((struct t_conf *));
159_TYPE( struct t_confent * ) t_getconfent P((struct t_conf *));
160_TYPE( struct t_confent * ) t_getconfbyindex P((struct t_conf *, int));
161_TYPE( struct t_confent * ) t_getconflast P((struct t_conf *));
162_TYPE( struct t_confent * ) t_makeconfent P((struct t_conf *, int));
163_TYPE( struct t_confent * ) t_makeconfent_c P((struct t_conf *, int));
164_TYPE( struct t_confent * ) t_newconfent P((struct t_conf *));
165_TYPE( int ) t_cmpconfent P((const struct t_confent *, const struct t_confent *));
166_TYPE( int ) t_checkconfent P((const struct t_confent *));
167_TYPE( void ) t_putconfent P((const struct t_confent *, FILE *));
168
169/* libc-style system conf file access */
170_TYPE( struct t_confent *) gettcent();
171_TYPE( struct t_confent *) gettcid P((int));
172_TYPE( void ) settcent();
173_TYPE( void ) endtcent();
174
175#ifdef ENABLE_NSW
176extern struct t_confent * _gettcent();
177extern struct t_confent * _gettcid P((int));
178extern void _settcent();
179extern void _endtcent();
180#endif
181
182/* A hack to support '+'-style entries in the passwd file */
183
184typedef enum fstate {
185  FILE_ONLY, /* Ordinary file, don't consult NIS ever */
186  FILE_NIS, /* Currently accessing file, use NIS if encountered */
187  IN_NIS, /* Currently in a '+' entry; use NIS for getXXent */
188} FILE_STATE;
189
190struct t_pwent { /* A single password file entry */
191  char * name;
192  struct t_num password;
193  struct t_num salt;
194  int index;
195};
196
197struct t_pw { /* An open password file */
198  FILE * instream;
199  char close_on_exit;
200  FILE_STATE state;
201  char userbuf[MAXUSERLEN];
202  unsigned char pwbuf[MAXPARAMLEN];
203  unsigned char saltbuf[SALTLEN];
204  struct t_pwent pebuf;
205};
206
207/*
208 * The password manipulation routines are patterned after the getpw*
209 * standard C library function calls.
210 *
211 * "t_openpw" reads a stream as if it were a password file.
212 * "t_openpwbyname" opens the named file as a password file.
213 * "t_closepw" closes an open password file.
214 * "t_rewindpw" starts the internal file pointer from the beginning
215 * of the password file.
216 * "t_getpwent" retrieves the next sequential password entry.
217 * "t_getpwbyname" looks up the password entry corresponding to the
218 * specified user.
219 * "t_makepwent" constructs a password entry from a username, password,
220 * numeric salt, and configuration entry.
221 * "t_putpwent" writes a password entry to a stream.
222 */
223_TYPE( struct t_pw * ) t_openpw P((FILE *));
224_TYPE( struct t_pw * ) t_openpwbyname P((const char *));
225_TYPE( void ) t_closepw P((struct t_pw *));
226_TYPE( void ) t_rewindpw P((struct t_pw *));
227_TYPE( struct t_pwent * ) t_getpwent P((struct t_pw *));
228_TYPE( struct t_pwent * ) t_getpwbyname P((struct t_pw *, const char *));
229_TYPE( struct t_pwent * ) t_makepwent P((struct t_pw *, const char *,
230                     const char *, const struct t_num *,
231                     const struct t_confent *));
232_TYPE( void ) t_putpwent P((const struct t_pwent *, FILE *));
233
234struct t_passwd {
235  struct t_pwent tp;
236  struct t_confent tc;
237};
238
239/* libc-style system password file access */
240_TYPE( struct t_passwd * ) gettpent();
241_TYPE( struct t_passwd * ) gettpnam P((const char *));
242_TYPE( void ) settpent();
243_TYPE( void ) endtpent();
244
245#ifdef ENABLE_NSW
246extern struct t_passwd * _gettpent();
247extern struct t_passwd * _gettpnam P((const char *));
248extern void _settpent();
249extern void _endtpent();
250#endif
251
252/*
253 * Utility functions
254 *
255 * "t_verifypw" accepts a username and password, and checks against the
256 * system password file to see if the password for that user is correct.
257 * Returns > 0 if it is correct, 0 if not, and -1 if some error occurred
258 * (i.e. the user doesn't exist on the system). This is intended ONLY
259 * for local authentication; for remote authentication, look at the
260 * t_client and t_server source. (That's the whole point of SRP!)
261 * "t_changepw" modifies the specified file, substituting the given password
262 * entry for the one already in the file. If no matching entry is found,
263 * the new entry is simply appended to the file.
264 * "t_deletepw" removes the specified user from the specified file.
265 */
266_TYPE( int ) t_verifypw P((const char *, const char *));
267_TYPE( int ) t_changepw P((const char *, const struct t_pwent *));
268_TYPE( int ) t_deletepw P((const char *, const char *));
269
270/* Conversion utilities */
271
272/*
273 * All these calls accept output as the first parameter. In the case of
274 * t_tohex and t_tob64, the last argument is the length of the byte-string
275 * input.
276 */
277_TYPE( char * t_tohex ) P((char *, char *, unsigned));
278_TYPE( int ) t_fromhex P((char *, char *));
279_TYPE( char * ) t_tob64 P((char *, char *, unsigned));
280_TYPE( int ) t_fromb64 P((char *, char *));
281
282/* Miscellaneous utilities */
283
284/*
285 * "t_random" is a cryptographic random number generator, which is seeded
286 * from various high-entropy sources and uses a one-way hash function
287 * in a feedback configuration.
288 * "t_sessionkey" is the interleaved hash used to generate session keys
289 * from a large integer.
290 * "t_getpass" reads a password from the terminal without echoing.
291 */
292_TYPE( void ) t_random P((unsigned char *, unsigned));
293_TYPE( void ) t_stronginitrand();
294_TYPE( unsigned char * )
295  t_sessionkey P((unsigned char *, unsigned char *, unsigned));
296_TYPE( int ) t_getpass P((char *, unsigned, const char *));
297
298/*
299 * Return value of t_checkprime:
300 * < 0 : not prime
301 * = 0 : prime, but not safe
302 * > 0 : safe
303 */
304#define NUM_NOTPRIME -1
305#define NUM_NOTSAFE 0
306#define NUM_SAFE 1
307
308_TYPE( int ) t_checkprime P((const struct t_num *));
309
310#endif
311

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