171 lines
4.3 KiB
C
171 lines
4.3 KiB
C
/* accessfile.c: Handle trusted network access file and per-user
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overrides.
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%%% portions-copyright-cmetz-96
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Portions of this software are Copyright 1996-1997 by Craig Metz, All Rights
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Reserved. The Inner Net License Version 2 applies to these portions of
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the software.
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You should have received a copy of the license with this software. If
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you didn't get a copy, you may request one from <license@inner.net>.
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Portions of this software are Copyright 1995 by Randall Atkinson and Dan
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McDonald, All Rights Reserved. All Rights under this copyright are assigned
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to the U.S. Naval Research Laboratory (NRL). The NRL Copyright Notice and
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License Agreement applies to this software.
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History:
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Modified by cmetz for OPIE 2.31. Include syslog.h on debug.
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Modified by cmetz for OPIE 2.3. Send debug info to syslog.
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Modified by cmetz for OPIE 2.2. Use FUNCTION declaration et al.
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Ifdef around some headers. Remove extra semicolon.
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Modified at NRL for OPIE 2.2. Moved from accessfile.c to
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libopie/opieaccessfile.c.
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Modified at NRL for OPIE 2.0.
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Written at Bellcore for the S/Key Version 1 software distribution
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(login.c).
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*/
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#include "opie_cfg.h"
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#if HAVE_STRING_H
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#include <string.h>
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#endif /* HAVE_STRING_H */
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif /* HAVE_UNISTD_H */
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#if HAVE_STDLIB_H
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#include <stdlib.h>
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#endif /* HAVE_STDLIB_H */
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#ifdef DEBUG
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#include <syslog.h>
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#endif /* DEBUG */
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#include "opie.h"
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int opieaccessfile FUNCTION((host), char *host)
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{
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#ifdef PATH_ACCESS_FILE
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/* Turn host into an IP address and then look it up in the authorization
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* database to determine if ordinary password logins are OK
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*/
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long n;
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struct hostent *hp;
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FILE *fp;
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char buf[128], **lp;
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#ifdef DEBUG
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syslog(LOG_DEBUG, "accessfile: host=%s", host);
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#endif /* DEBUG */
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if (!host[0])
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/* Local login, okay */
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return (1);
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if (isaddr(host)) {
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n = inet_addr(host);
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return rdnets(n);
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} else {
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hp = gethostbyname(host);
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if (!hp) {
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printf("Unknown host %s\n", host);
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return 0;
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}
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for (lp = hp->h_addr_list; *lp; lp++) {
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memcpy((char *) &n, *lp, sizeof(n));
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if (rdnets(n))
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return (1);
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}
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return (0);
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}
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}
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int rdnets FUNCTION((host), long host)
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{
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FILE *fp;
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char buf[128], *cp;
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long pattern, mask;
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int permit_it;
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if (!(fp = fopen(PATH_ACCESS_FILE, "r")))
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return 0;
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while (fgets(buf, sizeof(buf), fp), !feof(fp)) {
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if (buf[0] == '#')
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continue; /* Comment */
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if (!(cp = strtok(buf, " \t")))
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continue;
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/* two choices permit of deny */
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if (strncasecmp(cp, "permit", 4) == 0) {
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permit_it = 1;
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} else {
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if (strncasecmp(cp, "deny", 4) == 0) {
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permit_it = 0;
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} else {
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continue; /* ignore; it is not permit/deny */
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}
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}
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if (!(cp = strtok(NULL, " \t")))
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continue; /* Invalid line */
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pattern = inet_addr(cp);
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if (!(cp = strtok(NULL, " \t")))
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continue; /* Invalid line */
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mask = inet_addr(cp);
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#ifdef DEBUG
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syslog(LOG_DEBUG, "accessfile: %08x & %08x == %08x (%s)", host, mask, pattern, ((host & mask) == pattern) ? "true" : "false");
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#endif /* DEBUG */
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if ((host & mask) == pattern) {
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fclose(fp);
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return permit_it;
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}
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}
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fclose(fp);
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return 0;
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}
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/* Return TRUE if string appears to be an IP address in dotted decimal;
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* return FALSE otherwise (i.e., if string is a domain name)
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*/
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int isaddr FUNCTION((s), register char *s)
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{
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char c;
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if (!s)
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return 1; /* Can't happen */
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while ((c = *s++) != '\0') {
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if (c != '[' && c != ']' && !isdigit(c) && c != '.')
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return 0;
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}
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return 1;
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#else /* PATH_ACCESS_FILE */
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return !host[0];
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#endif /* PATH_ACCESS_FILE */
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}
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/* Returns the opposite of what you might expect */
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/* Returns 1 on error (allow)... this might not be what you want */
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int opiealways FUNCTION((homedir), char *homedir)
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{
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char *opiealwayspath;
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int i;
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if (!homedir)
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return 1;
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if (!(opiealwayspath = malloc(strlen(homedir) + sizeof(OPIE_ALWAYS_FILE) + 1)))
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return 1;
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strcpy(opiealwayspath, homedir);
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strcat(opiealwayspath, "/");
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strcat(opiealwayspath, OPIE_ALWAYS_FILE);
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i = access(opiealwayspath, F_OK);
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free(opiealwayspath);
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return (i);
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}
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