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/*
* APOP authentication, derived from MH 6.8.3
*/
/*
* Copyright (c) 1997 by Qualcomm Incorporated.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef APOP
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#ifdef GDBM
# include <gdbm.h>
#else
# include <ndbm.h>
#endif
#include <fcntl.h>
#include <pwd.h>
#if HAVE_STRINGS_H
# include <strings.h>
#endif
#if HAVE_SYS_FILE_H
# include <sys/file.h>
#endif
#include <popper.h>
#include <md5.h>
#include <string.h>
#include <flock.h>
/*
* Obscure password so a cleartext search doesn't come up with
* something interesting.
*
*/
char *
obscure(string)
char *string;
{
unsigned char *cp, *newstr;
cp = newstr = (unsigned char *)strdup(string);
while (*cp)
*cp++ ^= 0xff;
return((char *)newstr);
}
int
pop_apop (p)
POP *p;
{
register char *cp;
char buffer[BUFSIZ];
register unsigned char *dp;
unsigned char *ep,
digest[16];
struct passwd *pw;
#ifdef GDBM
char apop_file[BUFSIZ];
#else
char apop_dir[BUFSIZ];
#endif
struct stat st;
datum key,
ddatum;
#ifdef GDBM
GDBM_FILE db;
#else
DBM *db;
#endif
MD5_CTX mdContext;
int f;
(void)strncpy(p->user, p->pop_parm[1], sizeof(p->user));
p->user[sizeof(p->user)-1] = 0;
pop_log(p, LOG_INFO, "apop \"%s\"", p->user);
#ifdef AUTHFILE
if (checkauthfile(p->user) != 0)
return (pop_msg(p,POP_FAILURE,"Permission denied for %s.",p->user));
#endif
#ifdef NONAUTHFILE
if (checknonauthfile(p->user) != 0)
return (pop_msg(p,POP_FAILURE,"Permission denied for %s.",p->user));
#endif
if (((pw = getpwnam (p->user)) == NULL) || (pw->pw_passwd == NULL) ||
(*pw->pw_passwd == '\0')) {
return (pop_auth_fail(p,POP_FAILURE, pwerrmsg ,p->user));
}
if(pw->pw_uid == 0)
return (pop_auth_fail(p,POP_FAILURE,
"User %s login denied.", p->user));
#ifdef GDBM
if ((db = gdbm_open (APOP, 512, GDBM_READER, 0, 0)) == NULL)
#else
if ((db = dbm_open (APOP, O_RDONLY, 0)) == NULL)
#endif
return (pop_auth_fail(p,POP_FAILURE,
"POP authorization DB not available (%s)",
p->user, strerror(errno)));
#ifdef GDBM
(void) strncpy(apop_file, APOP, sizeof(apop_file) - 1);
apop_file[sizeof(apop_file)-1] = '\0';
if (stat (apop_file, &st) != -1
&& (st.st_mode & 0777) != 0600) {
gdbm_close (db);
return(pop_auth_fail(p, POP_FAILURE,
"POP authorization DB has wrong mode (0%o)",
st.st_mode & 0777));
}
f = open(apop_file, O_RDONLY);
if(f == -1) {
int e = errno;
gdbm_close (db);
return(pop_auth_fail(p, POP_FAILURE,
"unable to lock POP authorization DB (%s)",
strerror(e)));
}
#else
(void) strncpy(apop_dir, APOP, sizeof(apop_dir) - 5);
#if defined(BSD44_DBM)
(void) strcat(apop_dir, ".db");
#else
(void) strcat(apop_dir, ".dir");
#endif
if (stat (apop_dir, &st) != -1
&& (st.st_mode & 0777) != 0600) {
dbm_close (db);
return(pop_auth_fail(p, POP_FAILURE,
"POP authorization DB has wrong mode (0%o)",
st.st_mode & 0777));
}
f = open(apop_dir, O_RDONLY);
if(f == -1) {
int e = errno;
dbm_close (db);
return(pop_auth_fail(p, POP_FAILURE,
"unable to lock POP authorization DB (%s)",
strerror(e)));
}
#endif
#ifndef GDBM /* GDBM does locking itself */
if (flock (f, LOCK_SH) == -1) {
int e = errno;
(void) close(f);
#ifdef GDBM
gdbm_close (db);
#else
dbm_close (db);
#endif
return(pop_auth_fail(p, POP_FAILURE,
"unable to lock POP authorization DB (%s)",
strerror(e)));
}
#endif /* GDBM */
key.dsize = strlen (key.dptr = p->user) + 1;
#ifdef GDBM
ddatum = gdbm_fetch (db, key);
#else
ddatum = dbm_fetch (db, key);
#endif
if (ddatum.dptr == NULL) {
(void) close(f);
#ifdef GDBM
gdbm_close (db);
#else
dbm_close (db);
#endif
return(pop_auth_fail(p, POP_FAILURE, "not authorized"));
}
#ifdef GDBM
gdbm_close (db);
#else
dbm_close (db);
#endif
(void) close(f);
MD5Init(&mdContext);
MD5Update(&mdContext, (unsigned char *)p->md5str, strlen(p->md5str));
MD5Update(&mdContext, (unsigned char *)obscure(ddatum.dptr), (ddatum.dsize - 1));
MD5Final(digest, &mdContext);
cp = buffer;
for (ep = (dp = digest) + sizeof digest / sizeof digest[0];
dp < ep;
cp += 2)
(void) sprintf (cp, "%02x", *dp++ & 0xff);
*cp = '\0';
if (strcmp(p->pop_parm[2], buffer)) {
return(pop_auth_fail(p, POP_FAILURE, "authentication failure"));
}
#ifdef DEBUG
if (p->debug)
pop_log(p, LOG_NOTICE, "APOP authentication ok for \"%s\"", p->user);
#endif
if (genpath(p) < 0)
return(pop_msg(p, POP_FAILURE, "Unable to create temporary drop name"));
/* Make a temporary copy of the user's maildrop */
/* and set the group and user id */
if (pop_dropcopy(p, pw) != POP_SUCCESS) return (POP_FAILURE);
/* Initialize the last-message-accessed number */
p->last_msg = 0;
/* Authorization completed successfully */
return (pop_msg (p,POP_SUCCESS, "%s has %d message(s) (%d octets).",
p->user, p->msg_count, p->drop_size));
}
#endif /* APOP */
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