2 * $Id: auth.c,v 1.25 2002-02-28 21:20:39 jmarcus Exp $
4 * Copyright (c) 1990,1993 Regents of The University of Michigan.
5 * All Rights Reserved. See COPYRIGHT.
10 #endif /* HAVE_CONFIG_H */
17 #endif /* HAVE_UNISTD_H */
18 #include <sys/types.h>
19 #include <sys/param.h>
21 #include <netatalk/endian.h>
22 #include <atalk/afp.h>
23 #include <atalk/compat.h>
24 #include <atalk/util.h>
35 #include <atalk/logger.h>
39 #include <arpa/inet.h>
43 extern void afp_get_cmdline( int *ac, char ***av );
53 static int afp_version_index;
56 #if defined( __svr4__ ) && !defined( NGROUPS )
57 #define NGROUPS NGROUPS_MAX
58 #endif /* __svr4__ NGROUPS */
59 #if defined( sun ) && !defined( __svr4__ ) || defined( ultrix )
60 int groups[ NGROUPS ];
61 #else /* sun __svr4__ ultrix */
62 #if defined( __svr4__ ) && !defined( NGROUPS )
63 #define NGROUPS NGROUPS_MAX
64 #endif /* __svr4__ NGROUPS */
65 gid_t groups[ NGROUPS ];
66 #endif /* sun ultrix */
70 * These numbers are scattered throughout the code.
72 static struct afp_versions afp_versions[] = {
73 { "AFPVersion 1.1", 11 },
74 { "AFPVersion 2.0", 20 },
75 { "AFPVersion 2.1", 21 },
79 static struct uam_mod uam_modules = {NULL, NULL, &uam_modules, &uam_modules};
80 static struct uam_obj uam_login = {"", "", 0, {{NULL}}, &uam_login,
82 static struct uam_obj uam_changepw = {"", "", 0, {{NULL}}, &uam_changepw,
85 static struct uam_obj *afp_uam = NULL;
88 void status_versions( data )
95 memcpy(&status, start + AFPSTATUS_VERSOFF, sizeof(status));
96 num = sizeof( afp_versions ) / sizeof( afp_versions[ 0 ] );
97 data += ntohs( status );
99 for ( i = 0; i < num; i++ ) {
100 len = strlen( afp_versions[ i ].av_name );
102 memcpy( data, afp_versions[ i ].av_name , len );
105 status = htons( data - start );
106 memcpy(start + AFPSTATUS_UAMSOFF, &status, sizeof(status));
109 void status_uams(char *data, const char *authlist)
113 struct uam_obj *uams;
116 memcpy(&status, start + AFPSTATUS_UAMSOFF, sizeof(status));
118 while ((uams = uams->uam_prev) != &uam_login) {
119 if (strstr(authlist, uams->uam_path))
123 data += ntohs( status );
125 while ((uams = uams->uam_prev) != &uam_login) {
126 if (strstr(authlist, uams->uam_path)) {
127 LOG(log_info, logtype_default, "uam: \"%s\" available", uams->uam_name);
128 len = strlen( uams->uam_name);
130 memcpy( data, uams->uam_name, len );
136 status = htons(data - start);
137 memcpy(start + AFPSTATUS_ICONOFF, &status, sizeof(status));
140 /* handle errors by closing the connection. this is only needed
141 * by the afp_* functions. */
142 static int send_reply(const AFPObj *obj, const int err)
144 if ((err == AFP_OK) || (err == AFPERR_AUTHCONT))
147 obj->reply(obj->handle, err);
153 static int login(AFPObj *obj, struct passwd *pwd, void (*logout)(void))
157 #endif /* ADMIN_GRP */
159 /* UAM had syslog control; afpd needs to reassert itself */
160 set_processname("afpd");
161 syslog_setup(log_debug, logtype_default, logoption_ndelay|logoption_pid, logfacility_daemon);
163 if ( pwd->pw_uid == 0 ) { /* don't allow root login */
164 LOG(log_error, logtype_default, "login: root login denied!" );
165 return AFPERR_NOTAUTH;
168 LOG(log_info, logtype_default, "login %s (uid %d, gid %d) %s", pwd->pw_name,
169 pwd->pw_uid, pwd->pw_gid , afp_versions[afp_version_index]);
171 if (obj->proto == AFPPROTO_ASP) {
172 ASP asp = obj->handle;
173 int addr_net = ntohs( asp->asp_sat.sat_addr.s_net );
174 int addr_node = asp->asp_sat.sat_addr.s_node;
176 if (obj->options.authprintdir) {
177 if(addr_net && addr_node) { /* Do we have a valid Appletalk address? */
180 struct stat stat_buf;
182 sprintf(nodename, "%s/net%d.%dnode%d", obj->options.authprintdir,
183 addr_net / 256, addr_net % 256, addr_node);
184 LOG(log_info, logtype_default, "registering %s (uid %d) on %u.%u as %s",
185 pwd->pw_name, pwd->pw_uid, addr_net, addr_node, nodename);
187 if (stat(nodename, &stat_buf) == 0) { /* file exists */
188 if (S_ISREG(stat_buf.st_mode)) { /* normal file */
190 fp = fopen(nodename, "w");
191 fprintf(fp, "%s\n", pwd->pw_name);
193 chown( nodename, pwd->pw_uid, -1 );
194 } else { /* somebody is messing with us */
195 LOG(log_error, logtype_default, "print authfile %s is not a normal file, it will not be modified", nodename );
197 } else { /* file 'nodename' does not exist */
198 fp = fopen(nodename, "w");
199 fprintf(fp, "%s\n", pwd->pw_name);
201 chown( nodename, pwd->pw_uid, -1 );
203 } /* if (addr_net && addr_node ) */
204 } /* if (options->authprintdir) */
205 } /* if (obj->proto == AFPPROTO_ASP) */
207 if (initgroups( pwd->pw_name, pwd->pw_gid ) < 0) {
209 LOG(log_info, logtype_default, "running with uid %d", geteuid());
210 #else /* RUN_AS_USER */
211 LOG(log_error, logtype_default, "login: %s", strerror(errno));
212 return AFPERR_BADUAM;
213 #endif /* RUN_AS_USER */
217 /* Basically if the user is in the admin group, we stay root */
219 if (( ngroups = getgroups( NGROUPS, groups )) < 0 ) {
220 LOG(log_error, logtype_default, "login: getgroups: %s", strerror(errno) );
221 return AFPERR_BADUAM;
225 LOG(log_info, logtype_default, "obj->options.admingid == %d", obj->options.admingid);
227 if (obj->options.admingid != 0) {
229 for (i = 0; i < ngroups; i++) {
230 if (groups[i] == obj->options.admingid) admin = 1;
233 if (admin) LOG(log_info, logtype_default, "admin login -- %s", pwd->pw_name );
238 struct DSI *dsi = obj->handle;
245 afp_get_cmdline( &argc, &argv );
247 hp = gethostbyaddr( (char *) &dsi->client.sin_addr,
248 sizeof( struct in_addr ),
249 dsi->client.sin_family );
252 clientname = hp->h_name;
254 clientname = inet_ntoa( dsi->client.sin_addr );
256 sprintf( hostname, "%s@%s", pwd->pw_name, clientname );
258 if( sia_become_user( NULL, argc, argv, hostname, pwd->pw_name,
259 NULL, FALSE, NULL, NULL,
260 SIA_BEU_REALLOGIN ) != SIASUCCESS )
261 return AFPERR_BADUAM;
263 LOG(log_info, logtype_default, "session from %s (%s)", hostname,
264 inet_ntoa( dsi->client.sin_addr ) );
266 if (setegid( pwd->pw_gid ) < 0 || seteuid( pwd->pw_uid ) < 0) {
267 LOG(log_error, logtype_default, "login: %s", strerror(errno) );
268 return AFPERR_BADUAM;
272 if (setegid( pwd->pw_gid ) < 0 || seteuid( pwd->pw_uid ) < 0) {
273 LOG(log_error, logtype_default, "login: %s", strerror(errno) );
274 return AFPERR_BADUAM;
278 /* There's probably a better way to do this, but for now, we just
284 #endif /* ADMIN_GRP */
287 afp_switch = postauth_switch;
288 obj->logout = logout;
293 int afp_login(obj, ibuf, ibuflen, rbuf, rbuflen )
296 int ibuflen, *rbuflen;
298 struct passwd *pwd = NULL;
305 return send_reply(obj, AFPERR_SHUTDOWN );
308 return send_reply(obj, AFPERR_BADVERS );
311 len = (unsigned char) *ibuf++;
314 if (!len || len > ibuflen)
315 return send_reply(obj, AFPERR_BADVERS );
317 num = sizeof( afp_versions ) / sizeof( afp_versions[ 0 ]);
318 for ( i = 0; i < num; i++ ) {
319 if ( strncmp( ibuf, afp_versions[ i ].av_name , len ) == 0 ) {
320 afp_version = afp_versions[ i ].av_number;
321 afp_version_index = i;
325 if ( i == num ) /* An inappropo version */
326 return send_reply(obj, AFPERR_BADVERS );
331 return send_reply(obj, AFPERR_BADUAM);
333 len = (unsigned char) *ibuf++;
336 if (!len || len > ibuflen)
337 return send_reply(obj, AFPERR_BADUAM);
339 if ((afp_uam = auth_uamfind(UAM_SERVER_LOGIN, ibuf, len)) == NULL)
340 return send_reply(obj, AFPERR_BADUAM);
344 i = afp_uam->u.uam_login.login(obj, &pwd, ibuf, ibuflen, rbuf, rbuflen);
346 return send_reply(obj, i);
348 return send_reply(obj, login(obj, pwd, afp_uam->u.uam_login.logout));
352 int afp_logincont(obj, ibuf, ibuflen, rbuf, rbuflen)
355 int ibuflen, *rbuflen;
357 struct passwd *pwd = NULL;
360 if ( afp_uam == NULL || afp_uam->u.uam_login.logincont == NULL ) {
362 return send_reply(obj, AFPERR_NOTAUTH );
366 err = afp_uam->u.uam_login.logincont(obj, &pwd, ibuf, ibuflen,
369 return send_reply(obj, err);
371 return send_reply(obj, login(obj, pwd, afp_uam->u.uam_login.logout));
375 int afp_logout(obj, ibuf, ibuflen, rbuf, rbuflen)
378 int ibuflen, *rbuflen;
380 LOG(log_info, logtype_default, "logout %s", obj->username);
387 /* change password --
388 * NOTE: an FPLogin must already have completed successfully for this
389 * to work. this also does a little pre-processing before it hands
392 int afp_changepw(obj, ibuf, ibuflen, rbuf, rbuflen )
395 int ibuflen, *rbuflen;
397 char username[MACFILELEN + 1], *start = ibuf;
405 /* make sure we can deal w/ this uam */
406 len = (unsigned char) *ibuf++;
407 if ((uam = auth_uamfind(UAM_SERVER_CHANGEPW, ibuf, len)) == NULL)
408 return AFPERR_BADUAM;
411 if ((len + 1) & 1) /* pad byte */
414 len = (unsigned char) *ibuf++;
415 if ( len > sizeof(username) - 1) {
418 memcpy(username, ibuf, len);
419 username[ len ] = '\0';
421 if ((len + 1) & 1) /* pad byte */
424 LOG(log_info, logtype_default, "changing password for <%s>", username);
426 if (( pwd = uam_getname( username, sizeof(username))) == NULL )
429 /* send it off to the uam. we really don't use ibuflen right now. */
430 ibuflen -= (ibuf - start);
431 len = uam->u.uam_changepw(obj, username, pwd, ibuf, ibuflen,
433 LOG(log_info, logtype_default, "password change %s.",
434 (len == AFPERR_AUTHCONT) ? "continued" :
435 (len ? "failed" : "succeeded"));
441 int afp_getuserinfo(obj, ibuf, ibuflen, rbuf, rbuflen )
444 int ibuflen, *rbuflen;
453 ibuf += sizeof(id); /* userid is not used in AFP 2.0 */
454 memcpy(&bitmap, ibuf, sizeof(bitmap));
455 bitmap = ntohs(bitmap);
457 /* deal with error cases. we don't have to worry about
458 * AFPERR_ACCESS or AFPERR_NOITEM as geteuid and getegid always
462 if ((bitmap & USERIBIT_ALL) != bitmap)
463 return AFPERR_BITMAP;
465 /* copy the bitmap back to reply buffer */
466 memcpy(rbuf, ibuf, sizeof(bitmap));
467 rbuf += sizeof(bitmap);
468 *rbuflen = sizeof(bitmap);
470 /* copy the user/group info */
471 if (bitmap & USERIBIT_USER) {
472 id = htonl(geteuid());
473 memcpy(rbuf, &id, sizeof(id));
475 *rbuflen += sizeof(id);
478 if (bitmap & USERIBIT_GROUP) {
479 id = htonl(getegid());
480 memcpy(rbuf, &id, sizeof(id));
482 *rbuflen += sizeof(id);
488 #define UAM_LIST(type) (((type) == UAM_SERVER_LOGIN) ? &uam_login : \
489 (((type) == UAM_SERVER_CHANGEPW) ? \
490 &uam_changepw : NULL))
492 /* just do a linked list search. this could be sped up with a hashed
493 * list, but i doubt anyone's going to have enough uams to matter. */
494 struct uam_obj *auth_uamfind(const int type, const char *name,
497 struct uam_obj *prev, *start;
499 if (!name || !(start = UAM_LIST(type)))
503 while ((prev = prev->uam_prev) != start)
504 if (strndiacasecmp(prev->uam_name, name, len) == 0)
510 int auth_register(const int type, struct uam_obj *uam)
512 struct uam_obj *start;
514 if (!uam || !uam->uam_name || (*uam->uam_name == '\0'))
517 if (!(start = UAM_LIST(type)))
518 return 0; /* silently fail */
520 uam_attach(start, uam);
524 /* load all of the modules */
525 int auth_load(const char *path, const char *list)
527 char name[MAXPATHLEN + 1], buf[MAXPATHLEN + 1], *p;
532 if (!path || !list || (len = strlen(path)) > sizeof(name) - 2)
535 strncpy(buf, list, sizeof(buf));
536 if ((p = strtok(buf, ",")) == NULL)
540 if (name[len - 1] != '/') {
546 strncpy(name + len, p, sizeof(name) - len);
547 LOG(log_debug, logtype_default, "uam: loading (%s)", name);
549 if ((stat(name, &st) == 0) && (mod = uam_load(name, p))) {
551 if (stat(name, &st) == 0) {
552 if ((mod = uam_load(name, p))) {
553 uam_attach(&uam_modules, mod);
554 LOG(log_info, logtype_default, "uam: %s loaded", p);
556 LOG(log_info, logtype_default, "uam: %s load failure",p);
559 LOG(log_info, logtype_default, "uam: uam not found (status=%d)", stat(name, &st));
561 p = strtok(NULL, ",");
567 /* get rid of all of the uams */
570 struct uam_mod *mod, *prev, *start = &uam_modules;
572 prev = start->uam_prev;
573 while ((mod = prev) != start) {
574 prev = prev->uam_prev;