Adding upstream version 1.8.27.upstream/1.8.27upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 291 insertions, 0 deletions

diff --git a/lib/util/aix.c b/lib/util/aix.c
new file mode 100644
index 0000000..137de23
--- /dev/null
+++ b/lib/util/aix.c
@@ -0,0 +1,291 @@
+/*
+ * 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 */