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-rw-r--r--lib/util/aix.c291
1 files changed, 291 insertions, 0 deletions
diff --git a/lib/util/aix.c b/lib/util/aix.c
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+++ b/lib/util/aix.c
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+/*
+ * Copyright (c) 2008, 2010-2016 Todd C. Miller <Todd.Miller@sudo.ws>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * This is an open source non-commercial project. Dear PVS-Studio, please check it.
+ * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
+ */
+
+#include <config.h>
+
+#include <sys/types.h>
+#include <sys/resource.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <usersec.h>
+#include <uinfo.h>
+
+#define DEFAULT_TEXT_DOMAIN "sudo"
+#include "sudo_gettext.h" /* must be included before sudo_compat.h */
+
+#include "sudo_compat.h"
+#include "sudo_fatal.h"
+#include "sudo_debug.h"
+#include "sudo_util.h"
+
+#ifdef HAVE_GETUSERATTR
+
+#ifndef HAVE_SETRLIMIT64
+# define setrlimit64(a, b) setrlimit(a, b)
+# define rlimit64 rlimit
+# define rlim64_t rlim_t
+# define RLIM64_INFINITY RLIM_INFINITY
+#endif /* HAVE_SETRLIMIT64 */
+
+#ifndef RLIM_SAVED_MAX
+# define RLIM_SAVED_MAX RLIM64_INFINITY
+#endif
+
+struct aix_limit {
+ int resource;
+ char *soft;
+ char *hard;
+ int factor;
+};
+
+static struct aix_limit aix_limits[] = {
+ { RLIMIT_FSIZE, S_UFSIZE, S_UFSIZE_HARD, 512 },
+ { RLIMIT_CPU, S_UCPU, S_UCPU_HARD, 1 },
+ { RLIMIT_DATA, S_UDATA, S_UDATA_HARD, 512 },
+ { RLIMIT_STACK, S_USTACK, S_USTACK_HARD, 512 },
+ { RLIMIT_RSS, S_URSS, S_URSS_HARD, 512 },
+ { RLIMIT_CORE, S_UCORE, S_UCORE_HARD, 512 },
+ { RLIMIT_NOFILE, S_UNOFILE, S_UNOFILE_HARD, 1 }
+};
+
+static int
+aix_getlimit(char *user, char *lim, int *valp)
+{
+ debug_decl(aix_getlimit, SUDO_DEBUG_UTIL)
+
+ if (getuserattr(user, lim, valp, SEC_INT) != 0)
+ debug_return_int(-1);
+ debug_return_int(0);
+}
+
+static int
+aix_setlimits(char *user)
+{
+ struct rlimit64 rlim;
+ int val;
+ size_t n;
+ debug_decl(aix_setlimits, SUDO_DEBUG_UTIL)
+
+ if (setuserdb(S_READ) != 0) {
+ sudo_warn(U_("unable to open userdb"));
+ debug_return_int(-1);
+ }
+
+ /*
+ * For each resource limit, get the soft/hard values for the user
+ * and set those values via setrlimit64(). Must be run as euid 0.
+ */
+ for (n = 0; n < nitems(aix_limits); n++) {
+ /*
+ * We have two strategies, depending on whether or not the
+ * hard limit has been defined.
+ */
+ if (aix_getlimit(user, aix_limits[n].hard, &val) == 0) {
+ rlim.rlim_max = val == -1 ? RLIM64_INFINITY : (rlim64_t)val * aix_limits[n].factor;
+ if (aix_getlimit(user, aix_limits[n].soft, &val) == 0)
+ rlim.rlim_cur = val == -1 ? RLIM64_INFINITY : (rlim64_t)val * aix_limits[n].factor;
+ else
+ rlim.rlim_cur = rlim.rlim_max; /* soft not specd, use hard */
+ } else {
+ /* No hard limit set, try soft limit, if it exists. */
+ if (aix_getlimit(user, aix_limits[n].soft, &val) == -1)
+ continue;
+ rlim.rlim_cur = val == -1 ? RLIM64_INFINITY : (rlim64_t)val * aix_limits[n].factor;
+
+ /* Set default hard limit as per limits(4). */
+ switch (aix_limits[n].resource) {
+ case RLIMIT_CPU:
+ case RLIMIT_FSIZE:
+ rlim.rlim_max = rlim.rlim_cur;
+ break;
+ case RLIMIT_STACK:
+ rlim.rlim_max = 4194304UL * aix_limits[n].factor;
+ break;
+ default:
+ rlim.rlim_max = RLIM64_INFINITY;
+ break;
+ }
+ }
+ (void)setrlimit64(aix_limits[n].resource, &rlim);
+ }
+ enduserdb();
+ debug_return_int(0);
+}
+
+#ifdef HAVE_SETAUTHDB
+
+# ifndef HAVE_AUTHDB_T
+typedef char authdb_t[16];
+# endif
+
+/* The empty string means to access all defined authentication registries. */
+static authdb_t old_registry;
+
+# if defined(HAVE_DECL_SETAUTHDB) && !HAVE_DECL_SETAUTHDB
+int setauthdb(authdb_t new, authdb_t old);
+int getauthdb(authdb_t val);
+# endif
+# if defined(HAVE_DECL_USRINFO) && !HAVE_DECL_USRINFO
+int usrinfo(int cmd, char *buf, int count);
+# endif
+
+/*
+ * Look up authentication registry for user (SYSTEM in /etc/security/user) and
+ * set it as the default for the process. This ensures that password and
+ * group lookups are made against the correct source (files, NIS, LDAP, etc).
+ * Does not modify errno even on error since callers do not check return value.
+ */
+int
+aix_getauthregistry_v1(char *user, char *saved_registry)
+{
+ int serrno = errno;
+ int ret = -1;
+ debug_decl(aix_getauthregistry, SUDO_DEBUG_UTIL)
+
+ saved_registry[0] = '\0';
+ if (user != NULL) {
+ char *registry;
+
+ if (setuserdb(S_READ) != 0) {
+ sudo_warn(U_("unable to open userdb"));
+ goto done;
+ }
+ ret = getuserattr(user, S_REGISTRY, &registry, SEC_CHAR);
+ if (ret == 0) {
+ /* sizeof(authdb_t) is guaranteed to be 16 */
+ if (strlcpy(saved_registry, registry, 16) >= 16) {
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+ "registry for user %s too long: %s", user, registry);
+ }
+ sudo_debug_printf(SUDO_DEBUG_INFO,
+ "%s: saved authentication registry for user %s is %s",
+ __func__, user, saved_registry);
+ }
+ enduserdb();
+ } else {
+ /* Get the process-wide registry. */
+ ret = getauthdb(saved_registry);
+ }
+done:
+ errno = serrno;
+ debug_return_int(ret);
+}
+
+/*
+ * Set the specified authentication registry for user (SYSTEM in
+ * /etc/security/user) and set it as the default for the process.
+ * This ensures that password and group lookups are made against
+ * the correct source (files, NIS, LDAP, etc).
+ * If registry is NULL, look it up based on the user name.
+ * Does not modify errno even on error since callers do not check return value.
+ */
+int
+aix_setauthdb_v1(char *user)
+{
+ return aix_setauthdb_v2(user, NULL);
+}
+
+int
+aix_setauthdb_v2(char *user, char *registry)
+{
+ authdb_t regbuf;
+ int serrno = errno;
+ int ret = -1;
+ debug_decl(aix_setauthdb, SUDO_DEBUG_UTIL)
+
+ if (user != NULL) {
+ /* Look up authentication registry if one is not provided. */
+ if (registry == NULL) {
+ if (aix_getauthregistry(user, regbuf) != 0)
+ goto done;
+ registry = regbuf;
+ }
+ ret = setauthdb(registry, old_registry);
+ if (ret != 0) {
+ sudo_warn(U_("unable to switch to registry \"%s\" for %s"),
+ registry, user);
+ } else {
+ sudo_debug_printf(SUDO_DEBUG_INFO,
+ "%s: setting authentication registry to %s",
+ __func__, registry);
+ }
+ }
+done:
+ errno = serrno;
+ debug_return_int(ret);
+}
+
+/*
+ * Restore the saved authentication registry, if any.
+ * Does not modify errno even on error since callers do not check return value.
+ */
+int
+aix_restoreauthdb_v1(void)
+{
+ int serrno = errno;
+ int ret = 0;
+ debug_decl(aix_setauthdb, SUDO_DEBUG_UTIL)
+
+ if (setauthdb(old_registry, NULL) != 0) {
+ sudo_warn(U_("unable to restore registry"));
+ ret = -1;
+ } else {
+ sudo_debug_printf(SUDO_DEBUG_INFO,
+ "%s: setting authentication registry to %s",
+ __func__, old_registry);
+ }
+ errno = serrno;
+ debug_return_int(ret);
+}
+#endif
+
+int
+aix_prep_user_v1(char *user, const char *tty)
+{
+ char *info;
+ int len;
+ debug_decl(aix_setauthdb, SUDO_DEBUG_UTIL)
+
+ /* set usrinfo, like login(1) does */
+ len = asprintf(&info, "NAME=%s%cLOGIN=%s%cLOGNAME=%s%cTTY=%s%c",
+ user, '\0', user, '\0', user, '\0', tty ? tty : "", '\0');
+ if (len == -1) {
+ sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
+ debug_return_int(-1);
+ }
+ (void)usrinfo(SETUINFO, info, len);
+ free(info);
+
+#ifdef HAVE_SETAUTHDB
+ /* set authentication registry */
+ if (aix_setauthdb(user, NULL) != 0)
+ debug_return_int(-1);
+#endif
+
+ /* set resource limits */
+ if (aix_setlimits(user) != 0)
+ debug_return_int(-1);
+
+ debug_return_int(0);
+}
+#endif /* HAVE_GETUSERATTR */
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