2 * $Id: auth.c,v 1.19 2001-11-10 17:51:10 srittau 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>
39 #include <arpa/inet.h>
43 extern void afp_get_cmdline( int *ac, char ***av );
54 #if defined( __svr4__ ) && !defined( NGROUPS )
55 #define NGROUPS NGROUPS_MAX
56 #endif /* __svr4__ NGROUPS */
57 #if defined( sun ) && !defined( __svr4__ ) || defined( ultrix )
58 int groups[ NGROUPS ];
59 #else /* sun __svr4__ ultrix */
60 #if defined( __svr4__ ) && !defined( NGROUPS )
61 #define NGROUPS NGROUPS_MAX
62 #endif /* __svr4__ NGROUPS */
63 gid_t groups[ NGROUPS ];
64 #endif /* sun ultrix */
68 * These numbers are scattered throughout the code.
70 static struct afp_versions afp_versions[] = {
71 { "AFPVersion 1.1", 11 },
72 { "AFPVersion 2.0", 20 },
73 { "AFPVersion 2.1", 21 },
77 static struct uam_mod uam_modules = {NULL, NULL, &uam_modules, &uam_modules};
78 static struct uam_obj uam_login = {"", "", 0, {{NULL}}, &uam_login,
80 static struct uam_obj uam_changepw = {"", "", 0, {{NULL}}, &uam_changepw,
83 static struct uam_obj *afp_uam = NULL;
86 void status_versions( data )
93 memcpy(&status, start + AFPSTATUS_VERSOFF, sizeof(status));
94 num = sizeof( afp_versions ) / sizeof( afp_versions[ 0 ] );
95 data += ntohs( status );
97 for ( i = 0; i < num; i++ ) {
98 len = strlen( afp_versions[ i ].av_name );
100 memcpy( data, afp_versions[ i ].av_name , len );
103 status = htons( data - start );
104 memcpy(start + AFPSTATUS_UAMSOFF, &status, sizeof(status));
107 void status_uams(char *data, const char *authlist)
111 struct uam_obj *uams;
114 memcpy(&status, start + AFPSTATUS_UAMSOFF, sizeof(status));
116 while ((uams = uams->uam_prev) != &uam_login) {
117 if (strstr(authlist, uams->uam_path))
121 data += ntohs( status );
123 while ((uams = uams->uam_prev) != &uam_login) {
124 if (strstr(authlist, uams->uam_path)) {
125 syslog(LOG_INFO, "uam: \"%s\" available", uams->uam_name);
126 len = strlen( uams->uam_name);
128 memcpy( data, uams->uam_name, len );
134 status = htons(data - start);
135 memcpy(start + AFPSTATUS_ICONOFF, &status, sizeof(status));
138 /* handle errors by closing the connection. this is only needed
139 * by the afp_* functions. */
140 static int send_reply(const AFPObj *obj, const int err)
142 if ((err == AFP_OK) || (err == AFPERR_AUTHCONT))
145 obj->reply(obj->handle, err);
151 static int login(AFPObj *obj, struct passwd *pwd, void (*logout)(void))
155 #endif /* ADMIN_GRP */
157 /* UAM had syslog control; afpd needs to reassert itself */
158 openlog( "afpd", LOG_NDELAY|LOG_PID, LOG_DAEMON);
160 if ( pwd->pw_uid == 0 ) { /* don't allow root login */
161 syslog( LOG_ERR, "login: root login denied!" );
162 return AFPERR_NOTAUTH;
165 syslog( LOG_INFO, "login %s (uid %d, gid %d)", pwd->pw_name,
166 pwd->pw_uid, pwd->pw_gid );
168 if (obj->proto == AFPPROTO_ASP) {
169 ASP asp = obj->handle;
170 int addr_net = ntohs( asp->asp_sat.sat_addr.s_net );
171 int addr_node = asp->asp_sat.sat_addr.s_node;
173 if (obj->options.authprintdir) {
174 if(addr_net && addr_node) { /* Do we have a valid Appletalk address? */
177 struct stat stat_buf;
179 sprintf(nodename, "%s/net%d.%dnode%d", obj->options.authprintdir,
180 addr_net / 256, addr_net % 256, addr_node);
181 syslog (LOG_INFO, "registering %s (uid %d) on %u.%u as %s",
182 pwd->pw_name, pwd->pw_uid, addr_net, addr_node, nodename);
184 if (stat(nodename, &stat_buf) == 0) { /* file exists */
185 if (S_ISREG(stat_buf.st_mode)) { /* normal file */
187 fp = fopen(nodename, "w");
188 fprintf(fp, "%s\n", pwd->pw_name);
190 chown( nodename, pwd->pw_uid, -1 );
191 } else { /* somebody is messing with us */
192 syslog( LOG_ERR, "print authfile %s is not a normal file, it will not be modified", nodename );
194 } else { /* file 'nodename' does not exist */
195 fp = fopen(nodename, "w");
196 fprintf(fp, "%s\n", pwd->pw_name);
198 chown( nodename, pwd->pw_uid, -1 );
200 } /* if (addr_net && addr_node ) */
201 } /* if (options->authprintdir) */
202 } /* if (obj->proto == AFPPROTO_ASP) */
204 if (initgroups( pwd->pw_name, pwd->pw_gid ) < 0) {
206 syslog(LOG_INFO, "running with uid %d", geteuid());
207 #else /* RUN_AS_USER */
208 syslog(LOG_ERR, "login: %s", strerror(errno));
209 return AFPERR_BADUAM;
210 #endif /* RUN_AS_USER */
214 /* Basically if the user is in the admin group, we stay root */
216 if (( ngroups = getgroups( NGROUPS, groups )) < 0 ) {
217 syslog( LOG_ERR, "login: getgroups: %s", strerror(errno) );
218 return AFPERR_BADUAM;
222 syslog(LOG_INFO, "obj->options.admingid == %d", obj->options.admingid);
224 if (obj->options.admingid != 0) {
226 for (i = 0; i < ngroups; i++) {
227 if (groups[i] == obj->options.admingid) admin = 1;
230 if (admin) syslog( LOG_INFO, "admin login -- %s", pwd->pw_name );
235 struct DSI *dsi = obj->handle;
242 afp_get_cmdline( &argc, &argv );
244 hp = gethostbyaddr( (char *) &dsi->client.sin_addr,
245 sizeof( struct in_addr ),
246 dsi->client.sin_family );
249 clientname = hp->h_name;
251 clientname = inet_ntoa( dsi->client.sin_addr );
253 sprintf( hostname, "%s@%s", pwd->pw_name, clientname );
255 if( sia_become_user( NULL, argc, argv, hostname, pwd->pw_name,
256 NULL, FALSE, NULL, NULL,
257 SIA_BEU_REALLOGIN ) != SIASUCCESS )
258 return AFPERR_BADUAM;
260 syslog( LOG_INFO, "session from %s (%s)", hostname,
261 inet_ntoa( dsi->client.sin_addr ) );
263 if (setegid( pwd->pw_gid ) < 0 || seteuid( pwd->pw_uid ) < 0) {
264 syslog( LOG_ERR, "login: %m" );
265 return AFPERR_BADUAM;
269 if (setegid( pwd->pw_gid ) < 0 || seteuid( pwd->pw_uid ) < 0) {
270 syslog( LOG_ERR, "login: %s", strerror(errno) );
271 return AFPERR_BADUAM;
275 /* There's probably a better way to do this, but for now, we just
281 #endif /* ADMIN_GRP */
284 afp_switch = postauth_switch;
285 obj->logout = logout;
290 int afp_login(obj, ibuf, ibuflen, rbuf, rbuflen )
293 int ibuflen, *rbuflen;
295 struct passwd *pwd = NULL;
301 return send_reply(obj, AFPERR_SHUTDOWN );
304 len = (unsigned char) *ibuf++;
305 num = sizeof( afp_versions ) / sizeof( afp_versions[ 0 ]);
306 for ( i = 0; i < num; i++ ) {
307 if ( strncmp( ibuf, afp_versions[ i ].av_name , len ) == 0 ) {
308 afp_version = afp_versions[ i ].av_number;
312 if ( i == num ) /* An inappropo version */
313 return send_reply(obj, AFPERR_BADVERS );
316 len = (unsigned char) *ibuf++;
317 if ((afp_uam = auth_uamfind(UAM_SERVER_LOGIN, ibuf, len)) == NULL)
318 return send_reply(obj, AFPERR_BADUAM);
321 i = afp_uam->u.uam_login.login(obj, &pwd, ibuf, ibuflen, rbuf, rbuflen);
323 return send_reply(obj, i);
325 return send_reply(obj, login(obj, pwd, afp_uam->u.uam_login.logout));
329 int afp_logincont(obj, ibuf, ibuflen, rbuf, rbuflen)
332 int ibuflen, *rbuflen;
334 struct passwd *pwd = NULL;
337 if ( afp_uam == NULL || afp_uam->u.uam_login.logincont == NULL ) {
339 return send_reply(obj, AFPERR_NOTAUTH );
343 err = afp_uam->u.uam_login.logincont(obj, &pwd, ibuf, ibuflen,
346 return send_reply(obj, err);
348 return send_reply(obj, login(obj, pwd, afp_uam->u.uam_login.logout));
352 int afp_logout(obj, ibuf, ibuflen, rbuf, rbuflen)
355 int ibuflen, *rbuflen;
357 syslog(LOG_INFO, "logout %s", obj->username);
364 /* change password --
365 * NOTE: an FPLogin must already have completed successfully for this
366 * to work. this also does a little pre-processing before it hands
369 int afp_changepw(obj, ibuf, ibuflen, rbuf, rbuflen )
372 int ibuflen, *rbuflen;
374 char username[MACFILELEN + 1], *start = ibuf;
382 /* make sure we can deal w/ this uam */
383 len = (unsigned char) *ibuf++;
384 if ((uam = auth_uamfind(UAM_SERVER_CHANGEPW, ibuf, len)) == NULL)
385 return AFPERR_BADUAM;
388 if ((len + 1) & 1) /* pad byte */
391 len = (unsigned char) *ibuf++;
392 if ( len > sizeof(username) - 1) {
395 memcpy(username, ibuf, len);
396 username[ len ] = '\0';
398 if ((len + 1) & 1) /* pad byte */
401 syslog(LOG_INFO, "changing password for <%s>", username);
403 if (( pwd = uam_getname( username, sizeof(username))) == NULL )
406 /* send it off to the uam. we really don't use ibuflen right now. */
407 ibuflen -= (ibuf - start);
408 len = uam->u.uam_changepw(obj, username, pwd, ibuf, ibuflen,
410 syslog(LOG_INFO, "password change %s.",
411 (len == AFPERR_AUTHCONT) ? "continued" :
412 (len ? "failed" : "succeeded"));
418 int afp_getuserinfo(obj, ibuf, ibuflen, rbuf, rbuflen )
421 int ibuflen, *rbuflen;
430 ibuf += sizeof(id); /* userid is not used in AFP 2.0 */
431 memcpy(&bitmap, ibuf, sizeof(bitmap));
432 bitmap = ntohs(bitmap);
434 /* deal with error cases. we don't have to worry about
435 * AFPERR_ACCESS or AFPERR_NOITEM as geteuid and getegid always
439 if ((bitmap & USERIBIT_ALL) != bitmap)
440 return AFPERR_BITMAP;
442 /* copy the bitmap back to reply buffer */
443 memcpy(rbuf, ibuf, sizeof(bitmap));
444 rbuf += sizeof(bitmap);
445 *rbuflen = sizeof(bitmap);
447 /* copy the user/group info */
448 if (bitmap & USERIBIT_USER) {
449 id = htonl(geteuid());
450 memcpy(rbuf, &id, sizeof(id));
452 *rbuflen += sizeof(id);
455 if (bitmap & USERIBIT_GROUP) {
456 id = htonl(getegid());
457 memcpy(rbuf, &id, sizeof(id));
459 *rbuflen += sizeof(id);
465 #define UAM_LIST(type) (((type) == UAM_SERVER_LOGIN) ? &uam_login : \
466 (((type) == UAM_SERVER_CHANGEPW) ? \
467 &uam_changepw : NULL))
469 /* just do a linked list search. this could be sped up with a hashed
470 * list, but i doubt anyone's going to have enough uams to matter. */
471 struct uam_obj *auth_uamfind(const int type, const char *name,
474 struct uam_obj *prev, *start;
476 if (!name || !(start = UAM_LIST(type)))
480 while ((prev = prev->uam_prev) != start)
481 if (strndiacasecmp(prev->uam_name, name, len) == 0)
487 int auth_register(const int type, struct uam_obj *uam)
489 struct uam_obj *start;
491 if (!uam || !uam->uam_name || (*uam->uam_name == '\0'))
494 if (!(start = UAM_LIST(type)))
495 return 0; /* silently fail */
497 uam_attach(start, uam);
501 /* load all of the modules */
502 int auth_load(const char *path, const char *list)
504 char name[MAXPATHLEN + 1], buf[MAXPATHLEN + 1], *p;
509 if (!path || !list || (len = strlen(path)) > sizeof(name) - 2)
512 strncpy(buf, list, sizeof(buf));
513 if ((p = strtok(buf, ",")) == NULL)
517 if (name[len - 1] != '/') {
523 strncpy(name + len, p, sizeof(name) - len);
524 syslog(LOG_DEBUG, "uam: loading (%s)", name);
526 if ((stat(name, &st) == 0) && (mod = uam_load(name, p))) {
528 if (stat(name, &st) == 0) {
529 if ((mod = uam_load(name, p))) {
530 uam_attach(&uam_modules, mod);
531 syslog(LOG_INFO, "uam: %s loaded", p);
533 syslog(LOG_INFO, "uam: %s load failure",p);
536 syslog(LOG_INFO, "uam: uam not found (status=%d)", stat(name, &st));
538 p = strtok(NULL, ",");
544 /* get rid of all of the uams */
547 struct uam_mod *mod, *prev, *start = &uam_modules;
549 prev = start->uam_prev;
550 while ((mod = prev) != start) {
551 prev = prev->uam_prev;