Annotation of embedaddon/sudo/compat/getgrouplist.c, revision 1.1.1.4
1.1 misho 1: /*
1.1.1.2 misho 2: * Copyright (c) 2010, 2011, 2013 Todd C. Miller <Todd.Miller@courtesan.com>
1.1 misho 3: *
4: * Permission to use, copy, modify, and distribute this software for any
5: * purpose with or without fee is hereby granted, provided that the above
6: * copyright notice and this permission notice appear in all copies.
7: *
8: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15: */
16:
17: #include <config.h>
18:
1.1.1.2 misho 19: #ifndef HAVE_GETGROUPLIST
20:
1.1 misho 21: #include <sys/types.h>
22: #include <stdio.h>
23: #ifdef STDC_HEADERS
24: # include <stdlib.h>
25: # include <stddef.h>
26: #else
27: # ifdef HAVE_STDLIB_H
28: # include <stdlib.h>
29: # endif
30: #endif /* STDC_HEADERS */
31: #ifdef HAVE_STRING_H
32: # include <string.h>
33: #endif /* HAVE_STRING_H */
34: #ifdef HAVE_STRINGS_H
35: # include <strings.h>
36: #endif /* HAVE_STRINGS_H */
37: #include <grp.h>
1.1.1.2 misho 38: #ifdef HAVE_NSS_SEARCH
39: # include <limits.h>
40: # include <nsswitch.h>
41: # ifdef HAVE_NSS_DBDEFS_H
42: # include <nss_dbdefs.h>
43: # else
44: # include "compat/nss_dbdefs.h"
45: # endif
46: #endif
1.1 misho 47:
48: #include "missing.h"
49:
1.1.1.2 misho 50: #if defined(HAVE_GETGRSET)
1.1 misho 51: /*
52: * BSD-compatible getgrouplist(3) using getgrset(3)
53: */
54: int
55: getgrouplist(const char *name, gid_t basegid, gid_t *groups, int *ngroupsp)
56: {
57: char *cp, *grset = NULL;
58: int i, ngroups = 1;
59: int grpsize = *ngroupsp;
60: int rval = -1;
61: gid_t gid;
62:
63: /* We support BSD semantics where the first element is the base gid */
64: if (grpsize <= 0)
65: return -1;
66: groups[0] = basegid;
67:
68: #ifdef HAVE_SETAUTHDB
69: aix_setauthdb((char *) name);
70: #endif
71: if ((grset = getgrset(name)) != NULL) {
1.1.1.4 ! misho 72: const char *errstr;
1.1 misho 73: for (cp = strtok(grset, ","); cp != NULL; cp = strtok(NULL, ",")) {
1.1.1.4 ! misho 74: gid = atoid(cp, NULL, NULL, &errstr);
! 75: if (errstr == NULL && gid != basegid) {
1.1 misho 76: if (ngroups == grpsize)
77: goto done;
78: groups[ngroups++] = gid;
79: }
80: }
81: }
82: rval = 0;
83:
84: done:
1.1.1.2 misho 85: free(grset);
1.1 misho 86: #ifdef HAVE_SETAUTHDB
87: aix_restoreauthdb();
88: #endif
89: *ngroupsp = ngroups;
90:
91: return rval;
92: }
93:
1.1.1.2 misho 94: #elif defined(HAVE_NSS_SEARCH)
95:
96: #ifndef ALIGNBYTES
97: # define ALIGNBYTES (sizeof(long) - 1L)
98: #endif
99: #ifndef ALIGN
100: # define ALIGN(p) (((unsigned long)(p) + ALIGNBYTES) & ~ALIGNBYTES)
101: #endif
102:
103: extern void _nss_initf_group(nss_db_params_t *);
104:
1.1.1.3 misho 105: static id_t
106: strtoid(const char *p, int *errval)
107: {
108: char *ep;
109: id_t rval = 0;
110:
111: errno = 0;
112: if (*p == '-') {
113: long lval = strtol(p, &ep, 10);
114: if (ep == p || *ep != '\0') {
115: *errval = EINVAL;
116: goto done;
117: }
118: if ((errno == ERANGE && (lval == LONG_MAX || lval == LONG_MIN)) ||
119: (lval > INT_MAX || lval < INT_MIN)) {
120: *errval = ERANGE;
121: goto done;
122: }
123: rval = (id_t)lval;
124: *errval = 0;
125: } else {
126: unsigned long ulval = strtoul(p, &ep, 10);
127: if (ep == p || *ep != '\0') {
128: *errval = EINVAL;
129: goto done;
130: }
131: if ((errno == ERANGE && ulval == ULONG_MAX) || ulval > UINT_MAX) {
132: *errval = ERANGE;
133: goto done;
134: }
135: rval = (id_t)ulval;
136: *errval = 0;
137: }
138: done:
139: return rval;
140: }
141:
1.1.1.2 misho 142: /*
143: * Convert a groups file string (instr) to a struct group (ent) using
144: * buf for storage.
145: */
146: static int
147: str2grp(const char *instr, int inlen, void *ent, char *buf, int buflen)
148: {
149: struct group *grp = ent;
1.1.1.3 misho 150: char *cp, *fieldsep = buf;
1.1.1.2 misho 151: char **gr_mem, **gr_end;
1.1.1.3 misho 152: int errval, yp = 0;
153: id_t id;
1.1.1.2 misho 154:
155: /* Must at least have space to copy instr -> buf. */
156: if (inlen >= buflen)
157: return NSS_STR_PARSE_ERANGE;
158:
159: /* Paranoia: buf and instr should be distinct. */
160: if (buf != instr) {
161: memmove(buf, instr, inlen);
162: buf[inlen] = '\0';
163: }
164:
165: if ((fieldsep = strchr(cp = fieldsep, ':')) == NULL)
166: return NSS_STR_PARSE_PARSE;
167: *fieldsep++ = '\0';
168: grp->gr_name = cp;
169:
170: /* Check for YP inclusion/exclusion entries. */
171: if (*cp == '+' || *cp == '-') {
172: /* Only the name is required for YP inclusion/exclusion entries. */
173: grp->gr_passwd = "";
174: grp->gr_gid = 0;
175: grp->gr_mem = NULL;
176: yp = 1;
177: }
178:
179: if ((fieldsep = strchr(cp = fieldsep, ':')) == NULL)
180: return yp ? NSS_STR_PARSE_SUCCESS : NSS_STR_PARSE_PARSE;
181: *fieldsep++ = '\0';
182: grp->gr_passwd = cp;
183:
184: if ((fieldsep = strchr(cp = fieldsep, ':')) == NULL)
185: return yp ? NSS_STR_PARSE_SUCCESS : NSS_STR_PARSE_PARSE;
186: *fieldsep++ = '\0';
1.1.1.3 misho 187: id = strtoid(cp, &errval);
188: if (errval != 0) {
189: /*
190: * A range error is always a fatal error, but ignore garbage
191: * at the end of YP entries since it has no meaning.
192: */
193: if (errval == ERANGE)
194: return NSS_STR_PARSE_ERANGE;
1.1.1.2 misho 195: return yp ? NSS_STR_PARSE_SUCCESS : NSS_STR_PARSE_PARSE;
1.1.1.3 misho 196: }
1.1.1.2 misho 197: #ifdef GID_NOBODY
1.1.1.3 misho 198: /* Negative gids get mapped to nobody on Solaris. */
199: if (*cp == '-' && id != 0)
1.1.1.2 misho 200: grp->gr_gid = GID_NOBODY;
1.1.1.3 misho 201: else
1.1.1.2 misho 202: #endif
1.1.1.3 misho 203: grp->gr_gid = (gid_t)id;
1.1.1.2 misho 204:
205: /* Store group members, taking care to use proper alignment. */
206: grp->gr_mem = NULL;
207: if (*fieldsep != '\0') {
208: grp->gr_mem = gr_mem = (char **)ALIGN(buf + inlen + 1);
209: gr_end = (char **)((unsigned long)(buf + buflen) & ~ALIGNBYTES);
210: for (;;) {
211: if (gr_mem == gr_end)
212: return NSS_STR_PARSE_ERANGE; /* out of space! */
213: *gr_mem++ = cp;
214: if (fieldsep == NULL)
215: break;
216: if ((fieldsep = strchr(cp = fieldsep, ',')) != NULL)
217: *fieldsep++ = '\0';
218: }
219: *gr_mem = NULL;
220: }
221: return NSS_STR_PARSE_SUCCESS;
222: }
223:
224: static nss_status_t
225: process_cstr(const char *instr, int inlen, struct nss_groupsbymem *gbm)
226: {
227: const char *user = gbm->username;
228: nss_status_t rval = NSS_NOTFOUND;
229: nss_XbyY_buf_t *buf;
230: struct group *grp;
231: char **gr_mem;
232: int error, i;
233:
234: buf = _nss_XbyY_buf_alloc(sizeof(struct group), NSS_BUFLEN_GROUP);
235: if (buf == NULL)
236: return NSS_UNAVAIL;
237:
238: /* Parse groups file string -> struct group. */
239: grp = buf->result;
240: error = (*gbm->str2ent)(instr, inlen, grp, buf->buffer, buf->buflen);
241: if (error || grp->gr_mem == NULL)
242: goto done;
243:
244: for (gr_mem = grp->gr_mem; *gr_mem != NULL; gr_mem++) {
245: if (strcmp(*gr_mem, user) == 0) {
246: /* Append to gid_array unless gr_gid is a dupe. */
247: for (i = 0; i < gbm->numgids; i++) {
248: if (gbm->gid_array[i] == grp->gr_gid)
249: goto done; /* already present */
250: }
251: /* Store gid if there is space. */
252: if (i < gbm->maxgids)
253: gbm->gid_array[i] = grp->gr_gid;
254: /* Always increment numgids so we can detect when out of space. */
255: gbm->numgids++;
256: goto done;
257: }
258: }
259: done:
260: _nss_XbyY_buf_free(buf);
261: return rval;
262: }
263:
264: /*
265: * BSD-compatible getgrouplist(3) using nss_search(3)
266: */
267: int
268: getgrouplist(const char *name, gid_t basegid, gid_t *groups, int *ngroupsp)
269: {
270: struct nss_groupsbymem gbm;
271: static DEFINE_NSS_DB_ROOT(db_root);
272:
273: /* We support BSD semantics where the first element is the base gid */
274: if (*ngroupsp <= 0)
275: return -1;
276: groups[0] = basegid;
277:
278: memset(&gbm, 0, sizeof(gbm));
279: gbm.username = name;
280: gbm.gid_array = groups;
281: gbm.maxgids = *ngroupsp;
282: gbm.numgids = 1; /* for basegid */
283: gbm.force_slow_way = 1;
284: gbm.str2ent = str2grp;
285: gbm.process_cstr = process_cstr;
286:
287: /*
288: * Can't use nss_search return value since it may return NSS_UNAVAIL
289: * when no nsswitch.conf entry (e.g. compat mode).
290: */
291: (void)nss_search(&db_root, _nss_initf_group, NSS_DBOP_GROUP_BYMEMBER, &gbm);
292:
293: if (gbm.numgids <= gbm.maxgids) {
294: *ngroupsp = gbm.numgids;
295: return 0;
296: }
297: *ngroupsp = gbm.maxgids;
298: return -1;
299: }
300:
301: #else /* !HAVE_GETGRSET && !HAVE__GETGROUPSBYMEMBER */
1.1 misho 302:
303: /*
304: * BSD-compatible getgrouplist(3) using getgrent(3)
305: */
306: int
307: getgrouplist(const char *name, gid_t basegid, gid_t *groups, int *ngroupsp)
308: {
309: int i, ngroups = 1;
310: int grpsize = *ngroupsp;
311: int rval = -1;
312: struct group *grp;
313:
314: /* We support BSD semantics where the first element is the base gid */
315: if (grpsize <= 0)
316: return -1;
317: groups[0] = basegid;
318:
319: setgrent();
320: while ((grp = getgrent()) != NULL) {
1.1.1.4 ! misho 321: if (grp->gr_gid == basegid || grp->gr_mem == NULL)
1.1 misho 322: continue;
323:
324: for (i = 0; grp->gr_mem[i] != NULL; i++) {
325: if (strcmp(name, grp->gr_mem[i]) == 0)
326: break;
327: }
328: if (grp->gr_mem[i] == NULL)
329: continue; /* user not found */
330:
331: /* Only add if it is not the same as an existing gid */
332: for (i = 0; i < ngroups; i++) {
333: if (grp->gr_gid == groups[i])
334: break;
335: }
336: if (i == ngroups) {
337: if (ngroups == grpsize)
338: goto done;
339: groups[ngroups++] = grp->gr_gid;
340: }
341: }
342: rval = 0;
343:
344: done:
345: endgrent();
346: *ngroupsp = ngroups;
347:
348: return rval;
349: }
1.1.1.2 misho 350: #endif /* !HAVE_GETGRSET && !HAVE__GETGROUPSBYMEMBER */
351: #endif /* HAVE_GETGROUPLIST */
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