2 * $Id: auth.c,v 1.15 2001-06-20 18:33:04 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>
44 #if defined( __svr4__ ) && !defined( NGROUPS )
45 #define NGROUPS NGROUPS_MAX
46 #endif __svr4__ NGROUPS
47 #if defined( sun ) && !defined( __svr4__ ) || defined( ultrix )
48 int groups[ NGROUPS ];
49 #else sun __svr4__ ultrix
50 #if defined( __svr4__ ) && !defined( NGROUPS )
51 #define NGROUPS NGROUPS_MAX
52 #endif __svr4__ NGROUPS
53 gid_t groups[ NGROUPS ];
58 * These numbers are scattered throughout the code.
60 static struct afp_versions afp_versions[] = {
61 { "AFPVersion 1.1", 11 },
62 { "AFPVersion 2.0", 20 },
63 { "AFPVersion 2.1", 21 },
67 static struct uam_mod uam_modules = {NULL, NULL, &uam_modules, &uam_modules};
68 static struct uam_obj uam_login = {"", "", 0, {{NULL}}, &uam_login,
70 static struct uam_obj uam_changepw = {"", "", 0, {{NULL}}, &uam_changepw,
73 static struct uam_obj *afp_uam = NULL;
76 void status_versions( data )
83 memcpy(&status, start + AFPSTATUS_VERSOFF, sizeof(status));
84 num = sizeof( afp_versions ) / sizeof( afp_versions[ 0 ] );
85 data += ntohs( status );
87 for ( i = 0; i < num; i++ ) {
88 len = strlen( afp_versions[ i ].av_name );
90 memcpy( data, afp_versions[ i ].av_name , len );
93 status = htons( data - start );
94 memcpy(start + AFPSTATUS_UAMSOFF, &status, sizeof(status));
97 void status_uams(char *data, const char *authlist)
101 struct uam_obj *uams;
104 memcpy(&status, start + AFPSTATUS_UAMSOFF, sizeof(status));
106 while ((uams = uams->uam_prev) != &uam_login) {
107 if (strstr(authlist, uams->uam_path))
111 data += ntohs( status );
113 while ((uams = uams->uam_prev) != &uam_login) {
114 if (strstr(authlist, uams->uam_path)) {
115 syslog(LOG_INFO, "uam: \"%s\" available", uams->uam_name);
116 len = strlen( uams->uam_name);
118 memcpy( data, uams->uam_name, len );
124 status = htons(data - start);
125 memcpy(start + AFPSTATUS_ICONOFF, &status, sizeof(status));
128 /* handle errors by closing the connection. this is only needed
129 * by the afp_* functions. */
130 static int send_reply(const AFPObj *obj, const int err)
132 if ((err == AFP_OK) || (err == AFPERR_AUTHCONT))
135 obj->reply(obj->handle, err);
141 static int login(AFPObj *obj, struct passwd *pwd, void (*logout)(void))
147 /* UAM had syslog control; afpd needs to reassert itself */
148 openlog( "afpd", LOG_NDELAY|LOG_PID, LOG_DAEMON);
150 if ( pwd->pw_uid == 0 ) { /* don't allow root login */
151 syslog( LOG_ERR, "login: root login denied!" );
152 return AFPERR_NOTAUTH;
155 syslog( LOG_INFO, "login %s (uid %d, gid %d)", pwd->pw_name,
156 pwd->pw_uid, pwd->pw_gid );
158 if (obj->proto == AFPPROTO_ASP) {
159 ASP asp = obj->handle;
160 int addr_net = ntohs( asp->asp_sat.sat_addr.s_net );
161 int addr_node = asp->asp_sat.sat_addr.s_node;
163 if (obj->options.authprintdir) {
164 if(addr_net && addr_node) { /* Do we have a valid Appletalk address? */
167 struct stat stat_buf;
169 sprintf(nodename, "%s/net%d.%dnode%d", obj->options.authprintdir,
170 addr_net / 256, addr_net % 256, addr_node);
171 syslog (LOG_INFO, "registering %s (uid %d) on %u.%u as %s",
172 pwd->pw_name, pwd->pw_uid, addr_net, addr_node, nodename);
174 if (stat(nodename, &stat_buf) == 0) { /* file exists */
175 if (S_ISREG(stat_buf.st_mode)) { /* normal file */
177 fp = fopen(nodename, "w");
178 fprintf(fp, "%s\n", pwd->pw_name);
180 chown( nodename, pwd->pw_uid, -1 );
181 } else { /* somebody is messing with us */
182 syslog( LOG_ERR, "print authfile %s is not a normal file, it will not be modified", nodename );
184 } else { /* file 'nodename' does not exist */
185 fp = fopen(nodename, "w");
186 fprintf(fp, "%s\n", pwd->pw_name);
188 chown( nodename, pwd->pw_uid, -1 );
190 } /* if (addr_net && addr_node ) */
191 } /* if (options->authprintdir) */
192 } /* if (obj->proto == AFPPROTO_ASP) */
194 if (initgroups( pwd->pw_name, pwd->pw_gid ) < 0) {
196 syslog(LOG_INFO, "running with uid %d", geteuid());
197 #else /* RUN_AS_USER */
198 syslog(LOG_ERR, "login: %m");
199 return AFPERR_BADUAM;
200 #endif /* RUN_AS_USER */
204 /* Basically if the user is in the admin group, we stay root */
206 if (( ngroups = getgroups( NGROUPS, groups )) < 0 ) {
207 syslog( LOG_ERR, "login: getgroups: %m" );
208 return AFPERR_BADUAM;
212 syslog(LOG_INFO, "obj->options.admingid == %d", obj->options.admingid);
214 if (obj->options.admingid != 0) {
216 for (i = 0; i < ngroups; i++) {
217 if (groups[i] == obj->options.admingid) admin = 1;
220 if (admin) syslog( LOG_INFO, "admin login -- %s", pwd->pw_name );
223 if (setegid( pwd->pw_gid ) < 0 || seteuid( pwd->pw_uid ) < 0) {
224 syslog( LOG_ERR, "login: %m" );
225 return AFPERR_BADUAM;
228 /* There's probably a better way to do this, but for now, we just
234 #endif /* ADMIN_GRP */
237 afp_switch = postauth_switch;
238 obj->logout = logout;
243 int afp_login(obj, ibuf, ibuflen, rbuf, rbuflen )
246 int ibuflen, *rbuflen;
248 struct passwd *pwd = NULL;
254 return send_reply(obj, AFPERR_SHUTDOWN );
257 len = (unsigned char) *ibuf++;
258 num = sizeof( afp_versions ) / sizeof( afp_versions[ 0 ]);
259 for ( i = 0; i < num; i++ ) {
260 if ( strncmp( ibuf, afp_versions[ i ].av_name , len ) == 0 ) {
261 afp_version = afp_versions[ i ].av_number;
265 if ( i == num ) /* An inappropo version */
266 return send_reply(obj, AFPERR_BADVERS );
269 len = (unsigned char) *ibuf++;
270 if ((afp_uam = auth_uamfind(UAM_SERVER_LOGIN, ibuf, len)) == NULL)
271 return send_reply(obj, AFPERR_BADUAM);
274 i = afp_uam->u.uam_login.login(obj, &pwd, ibuf, ibuflen, rbuf, rbuflen);
276 return send_reply(obj, i);
278 return send_reply(obj, login(obj, pwd, afp_uam->u.uam_login.logout));
282 int afp_logincont(obj, ibuf, ibuflen, rbuf, rbuflen)
285 int ibuflen, *rbuflen;
287 struct passwd *pwd = NULL;
290 if ( afp_uam == NULL || afp_uam->u.uam_login.logincont == NULL ) {
292 return send_reply(obj, AFPERR_NOTAUTH );
296 err = afp_uam->u.uam_login.logincont(obj, &pwd, ibuf, ibuflen,
299 return send_reply(obj, err);
301 return send_reply(obj, login(obj, pwd, afp_uam->u.uam_login.logout));
305 int afp_logout(obj, ibuf, ibuflen, rbuf, rbuflen)
308 int ibuflen, *rbuflen;
310 syslog(LOG_INFO, "logout %s", obj->username);
317 /* change password --
318 * NOTE: an FPLogin must already have completed successfully for this
319 * to work. this also does a little pre-processing before it hands
322 int afp_changepw(obj, ibuf, ibuflen, rbuf, rbuflen )
325 int ibuflen, *rbuflen;
327 char username[MACFILELEN + 1], *start = ibuf;
335 /* make sure we can deal w/ this uam */
336 len = (unsigned char) *ibuf++;
337 if ((uam = auth_uamfind(UAM_SERVER_CHANGEPW, ibuf, len)) == NULL)
338 return AFPERR_BADUAM;
341 if ((len + 1) & 1) /* pad byte */
344 len = (unsigned char) *ibuf++;
345 if ( len > sizeof(username) - 1) {
348 memcpy(username, ibuf, len);
349 username[ len ] = '\0';
351 if ((len + 1) & 1) /* pad byte */
354 syslog(LOG_INFO, "changing password for <%s>", username);
356 if (( pwd = uam_getname( username, sizeof(username))) == NULL )
359 /* send it off to the uam. we really don't use ibuflen right now. */
360 ibuflen -= (ibuf - start);
361 len = uam->u.uam_changepw(obj, username, pwd, ibuf, ibuflen,
363 syslog(LOG_INFO, "password change %s.",
364 (len == AFPERR_AUTHCONT) ? "continued" :
365 (len ? "failed" : "succeeded"));
371 int afp_getuserinfo(obj, ibuf, ibuflen, rbuf, rbuflen )
374 int ibuflen, *rbuflen;
383 ibuf += sizeof(id); /* userid is not used in AFP 2.0 */
384 memcpy(&bitmap, ibuf, sizeof(bitmap));
385 bitmap = ntohs(bitmap);
387 /* deal with error cases. we don't have to worry about
388 * AFPERR_ACCESS or AFPERR_NOITEM as geteuid and getegid always
392 if ((bitmap & USERIBIT_ALL) != bitmap)
393 return AFPERR_BITMAP;
395 /* copy the bitmap back to reply buffer */
396 memcpy(rbuf, ibuf, sizeof(bitmap));
397 rbuf += sizeof(bitmap);
398 *rbuflen = sizeof(bitmap);
400 /* copy the user/group info */
401 if (bitmap & USERIBIT_USER) {
402 id = htonl(geteuid());
403 memcpy(rbuf, &id, sizeof(id));
405 *rbuflen += sizeof(id);
408 if (bitmap & USERIBIT_GROUP) {
409 id = htonl(getegid());
410 memcpy(rbuf, &id, sizeof(id));
412 *rbuflen += sizeof(id);
418 #define UAM_LIST(type) (((type) == UAM_SERVER_LOGIN) ? &uam_login : \
419 (((type) == UAM_SERVER_CHANGEPW) ? \
420 &uam_changepw : NULL))
422 /* just do a linked list search. this could be sped up with a hashed
423 * list, but i doubt anyone's going to have enough uams to matter. */
424 struct uam_obj *auth_uamfind(const int type, const char *name,
427 struct uam_obj *prev, *start;
429 if (!name || !(start = UAM_LIST(type)))
433 while ((prev = prev->uam_prev) != start)
434 if (strndiacasecmp(prev->uam_name, name, len) == 0)
440 int auth_register(const int type, struct uam_obj *uam)
442 struct uam_obj *start;
444 if (!uam || !uam->uam_name || (*uam->uam_name == '\0'))
447 if (!(start = UAM_LIST(type)))
448 return 0; /* silently fail */
450 uam_attach(start, uam);
454 /* load all of the modules */
455 int auth_load(const char *path, const char *list)
457 char name[MAXPATHLEN + 1], buf[MAXPATHLEN + 1], *p;
462 if (!path || !list || (len = strlen(path)) > sizeof(name) - 2)
465 strncpy(buf, list, sizeof(buf));
466 if ((p = strtok(buf, ",")) == NULL)
470 if (name[len - 1] != '/') {
476 strncpy(name + len, p, sizeof(name) - len);
477 syslog(LOG_DEBUG, "uam : Loading (%s)", name);
479 if ((stat(name, &st) == 0) && (mod = uam_load(name, p))) {
481 if (stat(name, &st) == 0) {
482 if ((mod = uam_load(name, p))) {
483 uam_attach(&uam_modules, mod);
484 syslog(LOG_INFO, "uam: %s loaded", p);
486 syslog(LOG_INFO, "uam: %s load failure",p);
489 syslog(LOG_INFO, "uam: uam not found (status=%d)", stat(name, &st));
491 p = strtok(NULL, ",");
497 /* get rid of all of the uams */
500 struct uam_mod *mod, *prev, *start = &uam_modules;
502 prev = start->uam_prev;
503 while ((mod = prev) != start) {
504 prev = prev->uam_prev;