1: /*
2: * Copyright (c) 2008, 2010-2011 Todd C. Miller <Todd.Miller@courtesan.com>
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:
19: #include <sys/types.h>
20: #include <sys/resource.h>
21:
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: #include <usersec.h>
32: #include <uinfo.h>
33:
34: #include "missing.h"
35: #include "alloc.h"
36: #include "error.h"
37:
38: #define DEFAULT_TEXT_DOMAIN "sudo"
39: #include "gettext.h"
40:
41: #ifdef HAVE_GETUSERATTR
42:
43: #ifndef HAVE_SETRLIMIT64
44: # define setrlimit64(a, b) setrlimit(a, b)
45: # define rlimit64 rlimit
46: # define rlim64_t rlim_t
47: # define RLIM64_INFINITY RLIM_INFINITY
48: #endif /* HAVE_SETRLIMIT64 */
49:
50: #ifndef RLIM_SAVED_MAX
51: # define RLIM_SAVED_MAX RLIM64_INFINITY
52: #endif
53:
54: struct aix_limit {
55: int resource;
56: char *soft;
57: char *hard;
58: int factor;
59: };
60:
61: static struct aix_limit aix_limits[] = {
62: { RLIMIT_FSIZE, S_UFSIZE, S_UFSIZE_HARD, 512 },
63: { RLIMIT_CPU, S_UCPU, S_UCPU_HARD, 1 },
64: { RLIMIT_DATA, S_UDATA, S_UDATA_HARD, 512 },
65: { RLIMIT_STACK, S_USTACK, S_USTACK_HARD, 512 },
66: { RLIMIT_RSS, S_URSS, S_URSS_HARD, 512 },
67: { RLIMIT_CORE, S_UCORE, S_UCORE_HARD, 512 },
68: { RLIMIT_NOFILE, S_UNOFILE, S_UNOFILE_HARD, 1 }
69: };
70:
71: static int
72: aix_getlimit(char *user, char *lim, rlim64_t *valp)
73: {
74: int val;
75:
76: if (getuserattr(user, lim, &val, SEC_INT) != 0)
77: return -1;
78: *valp = val;
79: return 0;
80: }
81:
82: static void
83: aix_setlimits(char *user)
84: {
85: struct rlimit64 rlim;
86: rlim64_t val;
87: int n;
88:
89: if (setuserdb(S_READ) != 0)
90: error(1, "unable to open userdb");
91:
92: /*
93: * For each resource limit, get the soft/hard values for the user
94: * and set those values via setrlimit64(). Must be run as euid 0.
95: */
96: for (n = 0; n < sizeof(aix_limits) / sizeof(aix_limits[0]); n++) {
97: /*
98: * We have two strategies, depending on whether or not the
99: * hard limit has been defined.
100: */
101: if (aix_getlimit(user, aix_limits[n].hard, &val) == 0) {
102: rlim.rlim_max = val == -1 ? RLIM64_INFINITY : val * aix_limits[n].factor;
103: if (aix_getlimit(user, aix_limits[n].soft, &val) == 0)
104: rlim.rlim_cur = val == -1 ? RLIM64_INFINITY : val * aix_limits[n].factor;
105: else
106: rlim.rlim_cur = rlim.rlim_max; /* soft not specd, use hard */
107: } else {
108: /* No hard limit set, try soft limit. */
109: if (aix_getlimit(user, aix_limits[n].soft, &val) == 0)
110: rlim.rlim_cur = val == -1 ? RLIM64_INFINITY : val * aix_limits[n].factor;
111:
112: /* Set hard limit per AIX /etc/security/limits documentation. */
113: switch (aix_limits[n].resource) {
114: case RLIMIT_CPU:
115: case RLIMIT_FSIZE:
116: rlim.rlim_max = rlim.rlim_cur;
117: break;
118: case RLIMIT_STACK:
119: rlim.rlim_max = RLIM_SAVED_MAX;
120: break;
121: default:
122: rlim.rlim_max = RLIM64_INFINITY;
123: break;
124: }
125: }
126: (void)setrlimit64(aix_limits[n].resource, &rlim);
127: }
128: enduserdb();
129: }
130:
131: #ifdef HAVE_SETAUTHDB
132: /*
133: * Look up administrative domain for user (SYSTEM in /etc/security/user) and
134: * set it as the default for the process. This ensures that password and
135: * group lookups are made against the correct source (files, NIS, LDAP, etc).
136: */
137: void
138: aix_setauthdb(char *user)
139: {
140: char *registry;
141:
142: if (user != NULL) {
143: if (setuserdb(S_READ) != 0)
144: error(1, _("unable to open userdb"));
145: if (getuserattr(user, S_REGISTRY, ®istry, SEC_CHAR) == 0) {
146: if (setauthdb(registry, NULL) != 0)
147: error(1, _("unable to switch to registry \"%s\" for %s"),
148: registry, user);
149: }
150: enduserdb();
151: }
152: }
153:
154: /*
155: * Restore the saved administrative domain, if any.
156: */
157: void
158: aix_restoreauthdb(void)
159: {
160: if (setauthdb(NULL, NULL) != 0)
161: error(1, _("unable to restore registry"));
162: }
163: #endif
164:
165: void
166: aix_prep_user(char *user, const char *tty)
167: {
168: char *info;
169: int len;
170:
171: /* set usrinfo, like login(1) does */
172: len = easprintf(&info, "NAME=%s%cLOGIN=%s%cLOGNAME=%s%cTTY=%s%c",
173: user, '\0', user, '\0', user, '\0', tty ? tty : "", '\0');
174: (void)usrinfo(SETUINFO, info, len);
175: efree(info);
176:
177: #ifdef HAVE_SETAUTHDB
178: /* set administrative domain */
179: aix_setauthdb(user);
180: #endif
181:
182: /* set resource limits */
183: aix_setlimits(user);
184: }
185: #endif /* HAVE_GETUSERATTR */
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