2 * $Id: auth.c,v 1.16 2001-06-25 15:18:01 rufustfirefly Exp $
4 * Copyright (c) 1990,1993 Regents of The University of Michigan.
5 * All Rights Reserved. See COPYRIGHT.
10 #endif /* HAVE_CONFIG_H */
16 #endif /* HAVE_UNISTD_H */
17 #include <sys/types.h>
18 #include <sys/param.h>
20 #include <netatalk/endian.h>
21 #include <atalk/afp.h>
22 #include <atalk/compat.h>
23 #include <atalk/util.h>
38 #include <arpa/inet.h>
42 extern void afp_get_cmdline( int *ac, char ***av );
53 #if defined( __svr4__ ) && !defined( NGROUPS )
54 #define NGROUPS NGROUPS_MAX
55 #endif __svr4__ NGROUPS
56 #if defined( sun ) && !defined( __svr4__ ) || defined( ultrix )
57 int groups[ NGROUPS ];
58 #else sun __svr4__ ultrix
59 #if defined( __svr4__ ) && !defined( NGROUPS )
60 #define NGROUPS NGROUPS_MAX
61 #endif __svr4__ NGROUPS
62 gid_t groups[ NGROUPS ];
67 * These numbers are scattered throughout the code.
69 static struct afp_versions afp_versions[] = {
70 { "AFPVersion 1.1", 11 },
71 { "AFPVersion 2.0", 20 },
72 { "AFPVersion 2.1", 21 },
76 static struct uam_mod uam_modules = {NULL, NULL, &uam_modules, &uam_modules};
77 static struct uam_obj uam_login = {"", "", 0, {{NULL}}, &uam_login,
79 static struct uam_obj uam_changepw = {"", "", 0, {{NULL}}, &uam_changepw,
82 static struct uam_obj *afp_uam = NULL;
85 void status_versions( data )
92 memcpy(&status, start + AFPSTATUS_VERSOFF, sizeof(status));
93 num = sizeof( afp_versions ) / sizeof( afp_versions[ 0 ] );
94 data += ntohs( status );
96 for ( i = 0; i < num; i++ ) {
97 len = strlen( afp_versions[ i ].av_name );
99 memcpy( data, afp_versions[ i ].av_name , len );
102 status = htons( data - start );
103 memcpy(start + AFPSTATUS_UAMSOFF, &status, sizeof(status));
106 void status_uams(char *data, const char *authlist)
110 struct uam_obj *uams;
113 memcpy(&status, start + AFPSTATUS_UAMSOFF, sizeof(status));
115 while ((uams = uams->uam_prev) != &uam_login) {
116 if (strstr(authlist, uams->uam_path))
120 data += ntohs( status );
122 while ((uams = uams->uam_prev) != &uam_login) {
123 if (strstr(authlist, uams->uam_path)) {
124 syslog(LOG_INFO, "uam: \"%s\" available", uams->uam_name);
125 len = strlen( uams->uam_name);
127 memcpy( data, uams->uam_name, len );
133 status = htons(data - start);
134 memcpy(start + AFPSTATUS_ICONOFF, &status, sizeof(status));
137 /* handle errors by closing the connection. this is only needed
138 * by the afp_* functions. */
139 static int send_reply(const AFPObj *obj, const int err)
141 if ((err == AFP_OK) || (err == AFPERR_AUTHCONT))
144 obj->reply(obj->handle, err);
150 static int login(AFPObj *obj, struct passwd *pwd, void (*logout)(void))
156 /* UAM had syslog control; afpd needs to reassert itself */
157 openlog( "afpd", LOG_NDELAY|LOG_PID, LOG_DAEMON);
159 if ( pwd->pw_uid == 0 ) { /* don't allow root login */
160 syslog( LOG_ERR, "login: root login denied!" );
161 return AFPERR_NOTAUTH;
164 syslog( LOG_INFO, "login %s (uid %d, gid %d)", pwd->pw_name,
165 pwd->pw_uid, pwd->pw_gid );
167 if (obj->proto == AFPPROTO_ASP) {
168 ASP asp = obj->handle;
169 int addr_net = ntohs( asp->asp_sat.sat_addr.s_net );
170 int addr_node = asp->asp_sat.sat_addr.s_node;
172 if (obj->options.authprintdir) {
173 if(addr_net && addr_node) { /* Do we have a valid Appletalk address? */
176 struct stat stat_buf;
178 sprintf(nodename, "%s/net%d.%dnode%d", obj->options.authprintdir,
179 addr_net / 256, addr_net % 256, addr_node);
180 syslog (LOG_INFO, "registering %s (uid %d) on %u.%u as %s",
181 pwd->pw_name, pwd->pw_uid, addr_net, addr_node, nodename);
183 if (stat(nodename, &stat_buf) == 0) { /* file exists */
184 if (S_ISREG(stat_buf.st_mode)) { /* normal file */
186 fp = fopen(nodename, "w");
187 fprintf(fp, "%s\n", pwd->pw_name);
189 chown( nodename, pwd->pw_uid, -1 );
190 } else { /* somebody is messing with us */
191 syslog( LOG_ERR, "print authfile %s is not a normal file, it will not be modified", nodename );
193 } else { /* file 'nodename' does not exist */
194 fp = fopen(nodename, "w");
195 fprintf(fp, "%s\n", pwd->pw_name);
197 chown( nodename, pwd->pw_uid, -1 );
199 } /* if (addr_net && addr_node ) */
200 } /* if (options->authprintdir) */
201 } /* if (obj->proto == AFPPROTO_ASP) */
203 if (initgroups( pwd->pw_name, pwd->pw_gid ) < 0) {
205 syslog(LOG_INFO, "running with uid %d", geteuid());
206 #else /* RUN_AS_USER */
207 syslog(LOG_ERR, "login: %m");
208 return AFPERR_BADUAM;
209 #endif /* RUN_AS_USER */
213 /* Basically if the user is in the admin group, we stay root */
215 if (( ngroups = getgroups( NGROUPS, groups )) < 0 ) {
216 syslog( LOG_ERR, "login: getgroups: %m" );
217 return AFPERR_BADUAM;
221 syslog(LOG_INFO, "obj->options.admingid == %d", obj->options.admingid);
223 if (obj->options.admingid != 0) {
225 for (i = 0; i < ngroups; i++) {
226 if (groups[i] == obj->options.admingid) admin = 1;
229 if (admin) syslog( LOG_INFO, "admin login -- %s", pwd->pw_name );
234 struct DSI *dsi = obj->handle;
241 afp_get_cmdline( &argc, &argv );
243 hp = gethostbyaddr( (char *) &dsi->client.sin_addr,
244 sizeof( struct in_addr ),
245 dsi->client.sin_family );
248 clientname = hp->h_name;
250 clientname = inet_ntoa( dsi->client.sin_addr );
252 sprintf( hostname, "%s@%s", pwd->pw_name, clientname );
254 if( sia_become_user( NULL, argc, argv, hostname, pwd->pw_name,
255 NULL, FALSE, NULL, NULL,
256 SIA_BEU_REALLOGIN ) != SIASUCCESS )
257 return AFPERR_BADUAM;
259 syslog( LOG_INFO, "session from %s (%s)", hostname,
260 inet_ntoa( dsi->client.sin_addr ) );
262 if (setegid( pwd->pw_gid ) < 0 || seteuid( pwd->pw_uid ) < 0) {
263 syslog( LOG_ERR, "login: %m" );
264 return AFPERR_BADUAM;
268 if (setegid( pwd->pw_gid ) < 0 || seteuid( pwd->pw_uid ) < 0) {
269 syslog( LOG_ERR, "login: %m" );
270 return AFPERR_BADUAM;
274 /* There's probably a better way to do this, but for now, we just
280 #endif /* ADMIN_GRP */
283 afp_switch = postauth_switch;
284 obj->logout = logout;
289 int afp_login(obj, ibuf, ibuflen, rbuf, rbuflen )
292 int ibuflen, *rbuflen;
294 struct passwd *pwd = NULL;
300 return send_reply(obj, AFPERR_SHUTDOWN );
303 len = (unsigned char) *ibuf++;
304 num = sizeof( afp_versions ) / sizeof( afp_versions[ 0 ]);
305 for ( i = 0; i < num; i++ ) {
306 if ( strncmp( ibuf, afp_versions[ i ].av_name , len ) == 0 ) {
307 afp_version = afp_versions[ i ].av_number;
311 if ( i == num ) /* An inappropo version */
312 return send_reply(obj, AFPERR_BADVERS );
315 len = (unsigned char) *ibuf++;
316 if ((afp_uam = auth_uamfind(UAM_SERVER_LOGIN, ibuf, len)) == NULL)
317 return send_reply(obj, AFPERR_BADUAM);
320 i = afp_uam->u.uam_login.login(obj, &pwd, ibuf, ibuflen, rbuf, rbuflen);
322 return send_reply(obj, i);
324 return send_reply(obj, login(obj, pwd, afp_uam->u.uam_login.logout));
328 int afp_logincont(obj, ibuf, ibuflen, rbuf, rbuflen)
331 int ibuflen, *rbuflen;
333 struct passwd *pwd = NULL;
336 if ( afp_uam == NULL || afp_uam->u.uam_login.logincont == NULL ) {
338 return send_reply(obj, AFPERR_NOTAUTH );
342 err = afp_uam->u.uam_login.logincont(obj, &pwd, ibuf, ibuflen,
345 return send_reply(obj, err);
347 return send_reply(obj, login(obj, pwd, afp_uam->u.uam_login.logout));
351 int afp_logout(obj, ibuf, ibuflen, rbuf, rbuflen)
354 int ibuflen, *rbuflen;
356 syslog(LOG_INFO, "logout %s", obj->username);
363 /* change password --
364 * NOTE: an FPLogin must already have completed successfully for this
365 * to work. this also does a little pre-processing before it hands
368 int afp_changepw(obj, ibuf, ibuflen, rbuf, rbuflen )
371 int ibuflen, *rbuflen;
373 char username[MACFILELEN + 1], *start = ibuf;
381 /* make sure we can deal w/ this uam */
382 len = (unsigned char) *ibuf++;
383 if ((uam = auth_uamfind(UAM_SERVER_CHANGEPW, ibuf, len)) == NULL)
384 return AFPERR_BADUAM;
387 if ((len + 1) & 1) /* pad byte */
390 len = (unsigned char) *ibuf++;
391 if ( len > sizeof(username) - 1) {
394 memcpy(username, ibuf, len);
395 username[ len ] = '\0';
397 if ((len + 1) & 1) /* pad byte */
400 syslog(LOG_INFO, "changing password for <%s>", username);
402 if (( pwd = uam_getname( username, sizeof(username))) == NULL )
405 /* send it off to the uam. we really don't use ibuflen right now. */
406 ibuflen -= (ibuf - start);
407 len = uam->u.uam_changepw(obj, username, pwd, ibuf, ibuflen,
409 syslog(LOG_INFO, "password change %s.",
410 (len == AFPERR_AUTHCONT) ? "continued" :
411 (len ? "failed" : "succeeded"));
417 int afp_getuserinfo(obj, ibuf, ibuflen, rbuf, rbuflen )
420 int ibuflen, *rbuflen;
429 ibuf += sizeof(id); /* userid is not used in AFP 2.0 */
430 memcpy(&bitmap, ibuf, sizeof(bitmap));
431 bitmap = ntohs(bitmap);
433 /* deal with error cases. we don't have to worry about
434 * AFPERR_ACCESS or AFPERR_NOITEM as geteuid and getegid always
438 if ((bitmap & USERIBIT_ALL) != bitmap)
439 return AFPERR_BITMAP;
441 /* copy the bitmap back to reply buffer */
442 memcpy(rbuf, ibuf, sizeof(bitmap));
443 rbuf += sizeof(bitmap);
444 *rbuflen = sizeof(bitmap);
446 /* copy the user/group info */
447 if (bitmap & USERIBIT_USER) {
448 id = htonl(geteuid());
449 memcpy(rbuf, &id, sizeof(id));
451 *rbuflen += sizeof(id);
454 if (bitmap & USERIBIT_GROUP) {
455 id = htonl(getegid());
456 memcpy(rbuf, &id, sizeof(id));
458 *rbuflen += sizeof(id);
464 #define UAM_LIST(type) (((type) == UAM_SERVER_LOGIN) ? &uam_login : \
465 (((type) == UAM_SERVER_CHANGEPW) ? \
466 &uam_changepw : NULL))
468 /* just do a linked list search. this could be sped up with a hashed
469 * list, but i doubt anyone's going to have enough uams to matter. */
470 struct uam_obj *auth_uamfind(const int type, const char *name,
473 struct uam_obj *prev, *start;
475 if (!name || !(start = UAM_LIST(type)))
479 while ((prev = prev->uam_prev) != start)
480 if (strndiacasecmp(prev->uam_name, name, len) == 0)
486 int auth_register(const int type, struct uam_obj *uam)
488 struct uam_obj *start;
490 if (!uam || !uam->uam_name || (*uam->uam_name == '\0'))
493 if (!(start = UAM_LIST(type)))
494 return 0; /* silently fail */
496 uam_attach(start, uam);
500 /* load all of the modules */
501 int auth_load(const char *path, const char *list)
503 char name[MAXPATHLEN + 1], buf[MAXPATHLEN + 1], *p;
508 if (!path || !list || (len = strlen(path)) > sizeof(name) - 2)
511 strncpy(buf, list, sizeof(buf));
512 if ((p = strtok(buf, ",")) == NULL)
516 if (name[len - 1] != '/') {
522 strncpy(name + len, p, sizeof(name) - len);
523 syslog(LOG_DEBUG, "uam : Loading (%s)", name);
525 if ((stat(name, &st) == 0) && (mod = uam_load(name, p))) {
527 if (stat(name, &st) == 0) {
528 if ((mod = uam_load(name, p))) {
529 uam_attach(&uam_modules, mod);
530 syslog(LOG_INFO, "uam: %s loaded", p);
532 syslog(LOG_INFO, "uam: %s load failure",p);
535 syslog(LOG_INFO, "uam: uam not found (status=%d)", stat(name, &st));
537 p = strtok(NULL, ",");
543 /* get rid of all of the uams */
546 struct uam_mod *mod, *prev, *start = &uam_modules;
548 prev = start->uam_prev;
549 while ((mod = prev) != start) {
550 prev = prev->uam_prev;