OpenWrt – Rev 1
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/*
* Copyright (c) 1997-1999 The Stanford SRP Authentication Project
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
*
* IN NO EVENT SHALL STANFORD BE LIABLE FOR ANY SPECIAL, INCIDENTAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, OR ANY DAMAGES WHATSOEVER
* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER OR NOT ADVISED OF
* THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF LIABILITY, ARISING OUT
* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* In addition, the following conditions apply:
*
* 1. Any software that incorporates the SRP authentication technology
* must display the following acknowlegment:
* "This product uses the 'Secure Remote Password' cryptographic
* authentication system developed by Tom Wu (tjw@CS.Stanford.EDU)."
*
* 2. Any software that incorporates all or part of the SRP distribution
* itself must also display the following acknowledgment:
* "This product includes software developed by Tom Wu and Eugene
* Jhong for the SRP Distribution (http://srp.stanford.edu/srp/)."
*
* 3. Redistributions in source or binary form must retain an intact copy
* of this copyright notice and list of conditions.
*/
#ifndef T_PWD_H
#define T_PWD_H
#ifndef P
#if defined (__STDC__) || defined (__cplusplus)
#define P(x) x
#else
#define P(x) ()
#endif
#endif
/* For building dynamic link libraries under windows, windows NT
* using MSVC1.5 or MSVC2.0
*/
#ifndef _DLLDECL
#define _DLLDECL
#ifdef MSVC15 /* MSVC1.5 support for 16 bit apps */
#define _MSVC15EXPORT _export
#define _MSVC20EXPORT
#define _DLLAPI _export _pascal
#define _TYPE(a) a _MSVC15EXPORT
#define DLLEXPORT 1
#elif MSVC20
#define _MSVC15EXPORT
#define _MSVC20EXPORT _declspec(dllexport)
#define _DLLAPI
#define _TYPE(a) _MSVC20EXPORT a
#define DLLEXPORT 1
#else /* Default, non-dll. Use this for Unix or DOS */
#define _MSVC15DEXPORT
#define _MSVC20EXPORT
#define _DLLAPI
#define _TYPE(a) a
#endif
#endif
#define MAXPARAMBITS 2048
#define MAXPARAMLEN ((MAXPARAMBITS + 7) / 8)
#define MAXB64PARAMLEN ((MAXPARAMBITS + 5) / 6 + 1)
#define MAXHEXPARAMLEN ((MAXPARAMBITS + 3) / 4 + 1)
#define MAXOCTPARAMLEN ((MAXPARAMBITS + 2) / 3 + 1)
#define MAXUSERLEN 32
#define MAXSALTLEN 32
#define MAXB64SALTLEN 44 /* 256 bits in b64 + null */
#define SALTLEN 10 /* Normally 80 bits */
#define RESPONSE_LEN 20 /* 160-bit proof hashes */
#define SESSION_KEY_LEN (2 * RESPONSE_LEN) /* 320-bit session key */
#define DEFAULT_PASSWD "tpasswd"
struct t_num { /* Standard byte-oriented integer representation */
int len;
unsigned char * data;
};
struct t_preconf { /* Structure returned by t_getpreparam() */
char * mod_b64;
char * gen_b64;
char * comment;
struct t_num modulus;
struct t_num generator;
};
/*
* The built-in (known good) parameters access routines
*
* "t_getprecount" returns the number of precompiled parameter sets.
* "t_getpreparam" returns the indicated parameter set.
* Memory is statically allocated - callers need not perform any memory mgmt.
*/
_TYPE( int ) t_getprecount();
_TYPE( struct t_preconf * ) t_getpreparam P((int));
struct t_confent { /* One configuration file entry (index, N, g) */
int index;
struct t_num modulus;
struct t_num generator;
};
struct t_conf { /* An open configuration file */
FILE * instream;
char close_on_exit;
unsigned char modbuf[MAXPARAMLEN];
unsigned char genbuf[MAXPARAMLEN];
struct t_confent tcbuf;
};
/*
* The configuration file routines are designed along the lines of the
* "getpw" functions in the standard C library.
*
* "t_openconf" accepts a stdio stream and interprets it as a config file.
* "t_openconfbyname" accepts a filename and does the same thing.
* "t_closeconf" closes the config file.
* "t_getconfent" fetches the next sequential configuration entry.
* "t_getconfbyindex" fetches the configuration entry whose index
* matches the one supplied, or NULL if one can't be found.
* "t_getconflast" fetches the last configuration entry in the file.
* "t_makeconfent" generates a set of configuration entry parameters
* randomly.
* "t_newconfent" returns an empty configuration entry.
* "t_cmpconfent" compares two configuration entries a la strcmp.
* "t_checkconfent" verifies that a set of configuration parameters
* are suitable. N must be prime and should be a safe prime.
* "t_putconfent" writes a configuration entry to a stream.
*/
_TYPE( struct t_conf * ) t_openconf P((FILE *));
_TYPE( struct t_conf * ) t_openconfbyname P((const char *));
_TYPE( void ) t_closeconf P((struct t_conf *));
_TYPE( void ) t_rewindconf P((struct t_conf *));
_TYPE( struct t_confent * ) t_getconfent P((struct t_conf *));
_TYPE( struct t_confent * ) t_getconfbyindex P((struct t_conf *, int));
_TYPE( struct t_confent * ) t_getconflast P((struct t_conf *));
_TYPE( struct t_confent * ) t_makeconfent P((struct t_conf *, int));
_TYPE( struct t_confent * ) t_makeconfent_c P((struct t_conf *, int));
_TYPE( struct t_confent * ) t_newconfent P((struct t_conf *));
_TYPE( int ) t_cmpconfent P((const struct t_confent *, const struct t_confent *));
_TYPE( int ) t_checkconfent P((const struct t_confent *));
_TYPE( void ) t_putconfent P((const struct t_confent *, FILE *));
/* libc-style system conf file access */
_TYPE( struct t_confent *) gettcent();
_TYPE( struct t_confent *) gettcid P((int));
_TYPE( void ) settcent();
_TYPE( void ) endtcent();
#ifdef ENABLE_NSW
extern struct t_confent * _gettcent();
extern struct t_confent * _gettcid P((int));
extern void _settcent();
extern void _endtcent();
#endif
/* A hack to support '+'-style entries in the passwd file */
typedef enum fstate {
FILE_ONLY, /* Ordinary file, don't consult NIS ever */
FILE_NIS, /* Currently accessing file, use NIS if encountered */
IN_NIS, /* Currently in a '+' entry; use NIS for getXXent */
} FILE_STATE;
struct t_pwent { /* A single password file entry */
char * name;
struct t_num password;
struct t_num salt;
int index;
};
struct t_pw { /* An open password file */
FILE * instream;
char close_on_exit;
FILE_STATE state;
char userbuf[MAXUSERLEN];
unsigned char pwbuf[MAXPARAMLEN];
unsigned char saltbuf[SALTLEN];
struct t_pwent pebuf;
};
/*
* The password manipulation routines are patterned after the getpw*
* standard C library function calls.
*
* "t_openpw" reads a stream as if it were a password file.
* "t_openpwbyname" opens the named file as a password file.
* "t_closepw" closes an open password file.
* "t_rewindpw" starts the internal file pointer from the beginning
* of the password file.
* "t_getpwent" retrieves the next sequential password entry.
* "t_getpwbyname" looks up the password entry corresponding to the
* specified user.
* "t_makepwent" constructs a password entry from a username, password,
* numeric salt, and configuration entry.
* "t_putpwent" writes a password entry to a stream.
*/
_TYPE( struct t_pw * ) t_openpw P((FILE *));
_TYPE( struct t_pw * ) t_openpwbyname P((const char *));
_TYPE( void ) t_closepw P((struct t_pw *));
_TYPE( void ) t_rewindpw P((struct t_pw *));
_TYPE( struct t_pwent * ) t_getpwent P((struct t_pw *));
_TYPE( struct t_pwent * ) t_getpwbyname P((struct t_pw *, const char *));
_TYPE( struct t_pwent * ) t_makepwent P((struct t_pw *, const char *,
const char *, const struct t_num *,
const struct t_confent *));
_TYPE( void ) t_putpwent P((const struct t_pwent *, FILE *));
struct t_passwd {
struct t_pwent tp;
struct t_confent tc;
};
/* libc-style system password file access */
_TYPE( struct t_passwd * ) gettpent();
_TYPE( struct t_passwd * ) gettpnam P((const char *));
_TYPE( void ) settpent();
_TYPE( void ) endtpent();
#ifdef ENABLE_NSW
extern struct t_passwd * _gettpent();
extern struct t_passwd * _gettpnam P((const char *));
extern void _settpent();
extern void _endtpent();
#endif
/*
* Utility functions
*
* "t_verifypw" accepts a username and password, and checks against the
* system password file to see if the password for that user is correct.
* Returns > 0 if it is correct, 0 if not, and -1 if some error occurred
* (i.e. the user doesn't exist on the system). This is intended ONLY
* for local authentication; for remote authentication, look at the
* t_client and t_server source. (That's the whole point of SRP!)
* "t_changepw" modifies the specified file, substituting the given password
* entry for the one already in the file. If no matching entry is found,
* the new entry is simply appended to the file.
* "t_deletepw" removes the specified user from the specified file.
*/
_TYPE( int ) t_verifypw P((const char *, const char *));
_TYPE( int ) t_changepw P((const char *, const struct t_pwent *));
_TYPE( int ) t_deletepw P((const char *, const char *));
/* Conversion utilities */
/*
* All these calls accept output as the first parameter. In the case of
* t_tohex and t_tob64, the last argument is the length of the byte-string
* input.
*/
_TYPE( char * t_tohex ) P((char *, char *, unsigned));
_TYPE( int ) t_fromhex P((char *, char *));
_TYPE( char * ) t_tob64 P((char *, char *, unsigned));
_TYPE( int ) t_fromb64 P((char *, char *));
/* Miscellaneous utilities */
/*
* "t_random" is a cryptographic random number generator, which is seeded
* from various high-entropy sources and uses a one-way hash function
* in a feedback configuration.
* "t_sessionkey" is the interleaved hash used to generate session keys
* from a large integer.
* "t_getpass" reads a password from the terminal without echoing.
*/
_TYPE( void ) t_random P((unsigned char *, unsigned));
_TYPE( void ) t_stronginitrand();
_TYPE( unsigned char * )
t_sessionkey P((unsigned char *, unsigned char *, unsigned));
_TYPE( int ) t_getpass P((char *, unsigned, const char *));
/*
* Return value of t_checkprime:
* < 0 : not prime
* = 0 : prime, but not safe
* > 0 : safe
*/
#define NUM_NOTPRIME -1
#define NUM_NOTSAFE 0
#define NUM_SAFE 1
_TYPE( int ) t_checkprime P((const struct t_num *));
#endif