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https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
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99c02d39bc
to be used to expand things beyond the size of the buffer passed in. Also do a general cleanup of sprintf -> snprintf as well as strcpy and strncat safety. Also expand some buffers to allow for the largest possible data that might be used. This is a 2.2 candidate. However, it needs to be vetted on -current since little testing has been done on this due to my lack of PPP on this machine. Reviewed by: Jordan Hubbard, Peter Wemm, Guido van Rooij
112 lines
2.8 KiB
C
112 lines
2.8 KiB
C
/*
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*
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* passwdauth.c - pjchilds@imforei.apana.org.au
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*
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* authenticate user via the password file
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the Peter Childs. The name of the author may not be used to
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* endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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*/
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#include <sys/types.h>
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#include <utmp.h>
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#include <time.h>
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#include <libutil.h>
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#include <pwd.h>
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#include "fsm.h"
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#include "passwdauth.h"
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int
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PasswdAuth(name, key)
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char *name, *key;
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{
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static int logged_in = 0;
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struct passwd *pwd;
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char *salt, *ep;
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struct utmp utmp;
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#ifdef DEBUG
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logprintf( "passwdauth called with name= %s, key= %s\n", name, key );
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#endif /* DEBUG */
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if(( pwd = getpwnam( name ) ))
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salt = pwd->pw_passwd;
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else
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{
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endpwent();
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LogPrintf( LOG_LCP, "PasswdAuth - user (%s) not in passwd file\n", name );
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return 0; /* false - failed to authenticate (password not in file) */
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}
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#ifdef LOCALHACK
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/*
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* All our PPP usernames start with 'P' so i check that here... if you
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* don't do this i suggest all your PPP users be members of a group
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* and you check the guid
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*/
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if( name[0] != 'P' )
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{
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LogPrintf( LOG_LCP, "PasswdAuth - user (%s) not a PPP user\n", name );
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endpwent();
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return 0;
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}
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#endif /* LOCALHACK */
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ep = crypt( key, salt );
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/* strcmp returns 0 if same */
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if( strcmp( ep, pwd->pw_passwd ) != 0 )
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{
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LogPrintf( LOG_LCP, "PasswdAuth - user (%s,%s) authentication failed\n",
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name, key );
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endpwent();
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return 0; /* false - failed to authenticate (didn't match up) */
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}
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/*
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* now we log them in... we have a static login flag so we don't
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* do it twice :)
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*/
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if( ! logged_in )
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{
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(void)time(&utmp.ut_time);
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(void)strncpy(utmp.ut_name, name, sizeof(utmp.ut_name));
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/*
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* if the first three chacters are "pap" trim them off before doing
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* utmp entry (see sample.ppp-pap-dialup
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*/
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if( strncmp( "pap", dstsystem, 3 ) == 0 )
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(void)strncpy(utmp.ut_line, (char *)(dstsystem + 3), sizeof(utmp.ut_line));
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else
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(void)strncpy(utmp.ut_line, dstsystem, sizeof(utmp.ut_line));
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(void)strncpy(utmp.ut_host, "auto-ppp",sizeof(utmp.ut_host));
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login(&utmp);
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(void)setlogin( pwd->pw_name );
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LogPrintf( LOG_LCP, "PasswdAuth has logged in user %s\n", name );
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logged_in = 1;
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}
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endpwent();
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return 1;
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}
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