1: /*
2: * Copyright (c) 2008, 2010-2013 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 "fatal.h"
37: #include "sudo_debug.h"
38:
39: #define DEFAULT_TEXT_DOMAIN "sudo"
40: #include "gettext.h"
41:
42: #ifdef HAVE_GETUSERATTR
43:
44: #ifndef HAVE_SETRLIMIT64
45: # define setrlimit64(a, b) setrlimit(a, b)
46: # define rlimit64 rlimit
47: # define rlim64_t rlim_t
48: # define RLIM64_INFINITY RLIM_INFINITY
49: #endif /* HAVE_SETRLIMIT64 */
50:
51: #ifndef RLIM_SAVED_MAX
52: # define RLIM_SAVED_MAX RLIM64_INFINITY
53: #endif
54:
55: struct aix_limit {
56: int resource;
57: char *soft;
58: char *hard;
59: int factor;
60: };
61:
62: static struct aix_limit aix_limits[] = {
63: { RLIMIT_FSIZE, S_UFSIZE, S_UFSIZE_HARD, 512 },
64: { RLIMIT_CPU, S_UCPU, S_UCPU_HARD, 1 },
65: { RLIMIT_DATA, S_UDATA, S_UDATA_HARD, 512 },
66: { RLIMIT_STACK, S_USTACK, S_USTACK_HARD, 512 },
67: { RLIMIT_RSS, S_URSS, S_URSS_HARD, 512 },
68: { RLIMIT_CORE, S_UCORE, S_UCORE_HARD, 512 },
69: { RLIMIT_NOFILE, S_UNOFILE, S_UNOFILE_HARD, 1 }
70: };
71:
72: static int
73: aix_getlimit(char *user, char *lim, rlim64_t *valp)
74: {
75: int val;
76: debug_decl(aix_getlimit, SUDO_DEBUG_UTIL)
77:
78: if (getuserattr(user, lim, &val, SEC_INT) != 0)
79: debug_return_int(-1);
80: *valp = val;
81: debug_return_int(0);
82: }
83:
84: static void
85: aix_setlimits(char *user)
86: {
87: struct rlimit64 rlim;
88: rlim64_t val;
89: int n;
90: debug_decl(aix_setlimits, SUDO_DEBUG_UTIL)
91:
92: if (setuserdb(S_READ) != 0)
93: fatal("unable to open userdb");
94:
95: /*
96: * For each resource limit, get the soft/hard values for the user
97: * and set those values via setrlimit64(). Must be run as euid 0.
98: */
99: for (n = 0; n < sizeof(aix_limits) / sizeof(aix_limits[0]); n++) {
100: /*
101: * We have two strategies, depending on whether or not the
102: * hard limit has been defined.
103: */
104: if (aix_getlimit(user, aix_limits[n].hard, &val) == 0) {
105: rlim.rlim_max = val == -1 ? RLIM64_INFINITY : val * aix_limits[n].factor;
106: if (aix_getlimit(user, aix_limits[n].soft, &val) == 0)
107: rlim.rlim_cur = val == -1 ? RLIM64_INFINITY : val * aix_limits[n].factor;
108: else
109: rlim.rlim_cur = rlim.rlim_max; /* soft not specd, use hard */
110: } else {
111: /* No hard limit set, try soft limit, if it exists. */
112: if (aix_getlimit(user, aix_limits[n].soft, &val) == -1)
113: continue;
114: rlim.rlim_cur = val == -1 ? RLIM64_INFINITY : val * aix_limits[n].factor;
115:
116: /* Set hard limit per AIX /etc/security/limits documentation. */
117: switch (aix_limits[n].resource) {
118: case RLIMIT_CPU:
119: case RLIMIT_FSIZE:
120: rlim.rlim_max = rlim.rlim_cur;
121: break;
122: case RLIMIT_STACK:
123: rlim.rlim_max = RLIM_SAVED_MAX;
124: break;
125: default:
126: rlim.rlim_max = RLIM64_INFINITY;
127: break;
128: }
129: }
130: (void)setrlimit64(aix_limits[n].resource, &rlim);
131: }
132: enduserdb();
133: debug_return;
134: }
135:
136: #ifdef HAVE_SETAUTHDB
137: /*
138: * Look up administrative domain for user (SYSTEM in /etc/security/user) and
139: * set it as the default for the process. This ensures that password and
140: * group lookups are made against the correct source (files, NIS, LDAP, etc).
141: */
142: void
143: aix_setauthdb(char *user)
144: {
145: char *registry;
146: debug_decl(aix_setauthdb, SUDO_DEBUG_UTIL)
147:
148: if (user != NULL) {
149: if (setuserdb(S_READ) != 0)
150: fatal(_("unable to open userdb"));
151: if (getuserattr(user, S_REGISTRY, ®istry, SEC_CHAR) == 0) {
152: if (setauthdb(registry, NULL) != 0)
153: fatal(_("unable to switch to registry \"%s\" for %s"),
154: registry, user);
155: }
156: enduserdb();
157: }
158: debug_return;
159: }
160:
161: /*
162: * Restore the saved administrative domain, if any.
163: */
164: void
165: aix_restoreauthdb(void)
166: {
167: debug_decl(aix_setauthdb, SUDO_DEBUG_UTIL)
168:
169: if (setauthdb(NULL, NULL) != 0)
170: fatal(_("unable to restore registry"));
171:
172: debug_return;
173: }
174: #endif
175:
176: void
177: aix_prep_user(char *user, const char *tty)
178: {
179: char *info;
180: int len;
181: debug_decl(aix_setauthdb, SUDO_DEBUG_UTIL)
182:
183: /* set usrinfo, like login(1) does */
184: len = easprintf(&info, "NAME=%s%cLOGIN=%s%cLOGNAME=%s%cTTY=%s%c",
185: user, '\0', user, '\0', user, '\0', tty ? tty : "", '\0');
186: (void)usrinfo(SETUINFO, info, len);
187: efree(info);
188:
189: #ifdef HAVE_SETAUTHDB
190: /* set administrative domain */
191: aix_setauthdb(user);
192: #endif
193:
194: /* set resource limits */
195: aix_setlimits(user);
196:
197: debug_return;
198: }
199: #endif /* HAVE_GETUSERATTR */
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