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ceea24b96554951c21b1241c6ec74eb61d5cc28d
sudo/plugins/sudoers/ldap.c
Todd C. Miller ceea24b965 Initial support for parsing sudoers LDIF files in cvtsudoers. 
This makes it possible to convert from LDAP sudoers to a traditional
sudoers file.  Semantic differences between file sudoers and LDAP
sudoers mean that LDIF -> sudoers is not completely equivalent.
2018-02-22 09:53:12 -07:00

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/*
* Copyright (c) 2003-2018 Todd C. Miller <Todd.Miller@sudo.ws>
*
* This code is derived from software contributed by Aaron Spangler.
*
* 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.
*/
#include <config.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_STRING_H
# include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif /* HAVE_STRINGS_H */
#include <unistd.h>
#include <time.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <pwd.h>
#include <grp.h>
#ifdef HAVE_LBER_H
# include <lber.h>
#endif
#include <ldap.h>
#if defined(HAVE_LDAP_SSL_H)
# include <ldap_ssl.h>
#elif defined(HAVE_MPS_LDAP_SSL_H)
# include <mps/ldap_ssl.h>
#endif
#ifdef HAVE_LDAP_SASL_INTERACTIVE_BIND_S
# ifdef HAVE_SASL_SASL_H
# include <sasl/sasl.h>
# else
# include <sasl.h>
# endif
#endif /* HAVE_LDAP_SASL_INTERACTIVE_BIND_S */
#include "sudoers.h"
#include "parse.h"
#include "gram.h"
#include "sudo_lbuf.h"
#include "sudo_ldap.h"
#include "sudo_ldap_conf.h"
#include "sudo_dso.h"
#if defined(HAVE_LDAP_SASL_INTERACTIVE_BIND_S) && !defined(LDAP_SASL_QUIET)
# define LDAP_SASL_QUIET 0
#endif
#ifndef HAVE_LDAP_UNBIND_EXT_S
#define ldap_unbind_ext_s(a, b, c) ldap_unbind_s(a)
#endif
#ifndef HAVE_LDAP_SEARCH_EXT_S
# ifdef HAVE_LDAP_SEARCH_ST
# define ldap_search_ext_s(a, b, c, d, e, f, g, h, i, j, k) \
ldap_search_st(a, b, c, d, e, f, i, k)
# else
# define ldap_search_ext_s(a, b, c, d, e, f, g, h, i, j, k) \
ldap_search_s(a, b, c, d, e, f, k)
# endif
#endif
#define LDAP_FOREACH(var, ld, res) \
for ((var) = ldap_first_entry((ld), (res)); \
(var) != NULL; \
(var) = ldap_next_entry((ld), (var)))
/* The TIMEFILTER_LENGTH is the length of the filter when timed entries
are used. The length is computed as follows:
81 for the filter itself
+ 2 * 17 for the now timestamp
*/
#define TIMEFILTER_LENGTH 115
/*
* The ldap_search structure implements a linked list of ldap and
* search result pointers, which allows us to remove them after
* all search results have been combined in memory.
*/
struct ldap_search_result {
STAILQ_ENTRY(ldap_search_result) entries;
LDAP *ldap;
LDAPMessage *searchresult;
};
STAILQ_HEAD(ldap_search_list, ldap_search_result);
/*
* The ldap_entry_wrapper structure is used to implement sorted result entries.
* A double is used for the order to allow for insertion of new entries
* without having to renumber everything.
* Note: there is no standard floating point type in LDAP.
* As a result, some LDAP servers will only allow an integer.
*/
struct ldap_entry_wrapper {
LDAPMessage *entry;
double order;
};
/*
* The ldap_result structure contains the list of matching searches as
* well as an array of all result entries sorted by the sudoOrder attribute.
*/
struct ldap_result {
struct ldap_search_list searches;
struct ldap_entry_wrapper *entries;
unsigned int allocated_entries;
unsigned int nentries;
bool user_matches;
bool host_matches;
};
#define ALLOCATION_INCREMENT 100
/*
* The ldap_netgroup structure implements a singly-linked tail queue of
* netgroups a user is a member of when querying netgroups directly.
*/
struct ldap_netgroup {
STAILQ_ENTRY(ldap_netgroup) entries;
char *name;
};
STAILQ_HEAD(ldap_netgroup_list, ldap_netgroup);
/* sudo_nss implementation */
static int sudo_ldap_open(struct sudo_nss *nss);
static int sudo_ldap_close(struct sudo_nss *nss);
static int sudo_ldap_parse(struct sudo_nss *nss);
static int sudo_ldap_setdefs(struct sudo_nss *nss);
static int sudo_ldap_lookup(struct sudo_nss *nss, int ret, int pwflag);
static int sudo_ldap_display_cmnd(struct sudo_nss *nss, struct passwd *pw);
static int sudo_ldap_display_defaults(struct sudo_nss *nss, struct passwd *pw,
struct sudo_lbuf *lbuf);
static int sudo_ldap_display_bound_defaults(struct sudo_nss *nss,
struct passwd *pw, struct sudo_lbuf *lbuf);
static int sudo_ldap_display_privs(struct sudo_nss *nss, struct passwd *pw,
struct sudo_lbuf *lbuf);
static struct ldap_result *sudo_ldap_result_get(struct sudo_nss *nss,
struct passwd *pw);
static char *sudo_ldap_get_first_rdn(LDAP *ld, LDAPMessage *entry);
/*
* LDAP sudo_nss handle.
* We store the connection to the LDAP server, the cached ldap_result object
* (if any), and the name of the user the query was performed for.
* If a new query is launched with sudo_ldap_result_get() that specifies a
* different user, the old cached result is freed before the new query is run.
*/
struct sudo_ldap_handle {
LDAP *ld;
struct ldap_result *result;
const char *username;
struct gid_list *gidlist;
};
struct sudo_nss sudo_nss_ldap = {
{ NULL, NULL },
sudo_ldap_open,
sudo_ldap_close,
sudo_ldap_parse,
sudo_ldap_setdefs,
sudo_ldap_lookup,
sudo_ldap_display_cmnd,
sudo_ldap_display_defaults,
sudo_ldap_display_bound_defaults,
sudo_ldap_display_privs
};
#ifdef HAVE_LDAP_INITIALIZE
static char *
sudo_ldap_join_uri(struct ldap_config_str_list *uri_list)
{
struct ldap_config_str *uri;
size_t len = 0;
char *buf = NULL;
debug_decl(sudo_ldap_join_uri, SUDOERS_DEBUG_LDAP)
STAILQ_FOREACH(uri, uri_list, entries) {
if (ldap_conf.ssl_mode == SUDO_LDAP_STARTTLS) {
if (strncasecmp(uri->val, "ldaps://", 8) == 0) {
sudo_warnx(U_("starttls not supported when using ldaps"));
ldap_conf.ssl_mode = SUDO_LDAP_SSL;
}
}
len += strlen(uri->val) + 1;
}
if (len == 0 || (buf = malloc(len)) == NULL) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
} else {
char *cp = buf;
STAILQ_FOREACH(uri, uri_list, entries) {
cp += strlcpy(cp, uri->val, len - (cp - buf));
*cp++ = ' ';
}
cp[-1] = '\0';
}
debug_return_str(buf);
}
#endif /* HAVE_LDAP_INITIALIZE */
/*
* Wrapper for ldap_create() or ldap_init() that handles
* SSL/TLS initialization as well.
* Returns LDAP_SUCCESS on success, else non-zero.
*/
static int
sudo_ldap_init(LDAP **ldp, const char *host, int port)
{
LDAP *ld;
int ret = LDAP_CONNECT_ERROR;
debug_decl(sudo_ldap_init, SUDOERS_DEBUG_LDAP)
#ifdef HAVE_LDAPSSL_INIT
if (ldap_conf.ssl_mode != SUDO_LDAP_CLEAR) {
const int defsecure = ldap_conf.ssl_mode == SUDO_LDAP_SSL;
DPRINTF2("ldapssl_clientauth_init(%s, %s)",
ldap_conf.tls_certfile ? ldap_conf.tls_certfile : "NULL",
ldap_conf.tls_keyfile ? ldap_conf.tls_keyfile : "NULL");
ret = ldapssl_clientauth_init(ldap_conf.tls_certfile, NULL,
ldap_conf.tls_keyfile != NULL, ldap_conf.tls_keyfile, NULL);
/*
* Starting with version 5.0, Mozilla-derived LDAP SDKs require
* the cert and key paths to be a directory, not a file.
* If the user specified a file and it fails, try the parent dir.
*/
if (ret != LDAP_SUCCESS) {
bool retry = false;
if (ldap_conf.tls_certfile != NULL) {
char *cp = strrchr(ldap_conf.tls_certfile, '/');
if (cp != NULL && strncmp(cp + 1, "cert", 4) == 0) {
*cp = '\0';
retry = true;
}
}
if (ldap_conf.tls_keyfile != NULL) {
char *cp = strrchr(ldap_conf.tls_keyfile, '/');
if (cp != NULL && strncmp(cp + 1, "key", 3) == 0) {
*cp = '\0';
retry = true;
}
}
if (retry) {
DPRINTF2("retry ldapssl_clientauth_init(%s, %s)",
ldap_conf.tls_certfile ? ldap_conf.tls_certfile : "NULL",
ldap_conf.tls_keyfile ? ldap_conf.tls_keyfile : "NULL");
ret = ldapssl_clientauth_init(ldap_conf.tls_certfile, NULL,
ldap_conf.tls_keyfile != NULL, ldap_conf.tls_keyfile, NULL);
}
}
if (ret != LDAP_SUCCESS) {
sudo_warnx(U_("unable to initialize SSL cert and key db: %s"),
ldapssl_err2string(ret));
if (ldap_conf.tls_certfile == NULL)
sudo_warnx(U_("you must set TLS_CERT in %s to use SSL"),
path_ldap_conf);
goto done;
}
DPRINTF2("ldapssl_init(%s, %d, %d)", host, port, defsecure);
if ((ld = ldapssl_init(host, port, defsecure)) != NULL)
ret = LDAP_SUCCESS;
} else
#elif defined(HAVE_LDAP_SSL_INIT) && defined(HAVE_LDAP_SSL_CLIENT_INIT)
if (ldap_conf.ssl_mode == SUDO_LDAP_SSL) {
int sslrc;
ret = ldap_ssl_client_init(ldap_conf.tls_keyfile, ldap_conf.tls_keypw,
0, &sslrc);
if (ret != LDAP_SUCCESS) {
sudo_warnx("ldap_ssl_client_init(): %s (SSL reason code %d)",
ldap_err2string(ret), sslrc);
goto done;
}
DPRINTF2("ldap_ssl_init(%s, %d, NULL)", host, port);
if ((ld = ldap_ssl_init((char *)host, port, NULL)) != NULL)
ret = LDAP_SUCCESS;
} else
#endif
{
#ifdef HAVE_LDAP_CREATE
DPRINTF2("ldap_create()");
if ((ret = ldap_create(&ld)) != LDAP_SUCCESS)
goto done;
DPRINTF2("ldap_set_option(LDAP_OPT_HOST_NAME, %s)", host);
ret = ldap_set_option(ld, LDAP_OPT_HOST_NAME, host);
#else
DPRINTF2("ldap_init(%s, %d)", host, port);
if ((ld = ldap_init((char *)host, port)) == NULL)
goto done;
ret = LDAP_SUCCESS;
#endif
}
*ldp = ld;
done:
debug_return_int(ret);
}
/*
* Walk through search results and return true if we have a matching
* non-Unix group (including netgroups), else false.
*/
static bool
sudo_ldap_check_non_unix_group(LDAP *ld, LDAPMessage *entry, struct passwd *pw)
{
struct berval **bv, **p;
char *val;
bool ret = false;
debug_decl(sudo_ldap_check_non_unix_group, SUDOERS_DEBUG_LDAP)
if (!entry)
debug_return_bool(ret);
/* get the values from the entry */
bv = ldap_get_values_len(ld, entry, "sudoUser");
if (bv == NULL)
debug_return_bool(ret);
/* walk through values */
for (p = bv; *p != NULL && !ret; p++) {
val = (*p)->bv_val;
if (*val == '+') {
if (netgr_matches(val, def_netgroup_tuple ? user_runhost : NULL,
def_netgroup_tuple ? user_srunhost : NULL, pw->pw_name))
ret = true;
DPRINTF2("ldap sudoUser netgroup '%s' ... %s", val,
ret ? "MATCH!" : "not");
} else {
if (group_plugin_query(pw->pw_name, val + 2, pw))
ret = true;
DPRINTF2("ldap sudoUser non-Unix group '%s' ... %s", val,
ret ? "MATCH!" : "not");
}
}
ldap_value_free_len(bv); /* cleanup */
debug_return_bool(ret);
}
/*
* Walk through search results and return true if we have a
* host match, else false.
*/
static bool
sudo_ldap_check_host(LDAP *ld, LDAPMessage *entry, struct passwd *pw)
{
struct berval **bv, **p;
char *val;
bool negated;
int matched = UNSPEC;
debug_decl(sudo_ldap_check_host, SUDOERS_DEBUG_LDAP)
if (!entry)
debug_return_bool(false);
/* get the values from the entry */
bv = ldap_get_values_len(ld, entry, "sudoHost");
if (bv == NULL)
debug_return_bool(false);
/* walk through values */
for (p = bv; *p != NULL && matched != false; p++) {
val = (*p)->bv_val;
negated = sudo_ldap_is_negated(&val);
/* match any or address or netgroup or hostname */
if (strcmp(val, "ALL") == 0 || addr_matches(val) ||
netgr_matches(val, user_runhost, user_srunhost,
def_netgroup_tuple ? pw->pw_name : NULL) ||
hostname_matches(user_srunhost, user_runhost, val)) {
matched = negated ? false : true;
}
DPRINTF2("ldap sudoHost '%s' ... %s",
val, matched == true ? "MATCH!" : "not");
}
ldap_value_free_len(bv); /* cleanup */
debug_return_bool(matched == true);
}
static int
sudo_ldap_check_runas_user(LDAP *ld, LDAPMessage *entry, int *group_matched)
{
struct berval **bv, **p;
char *val;
bool ret = false;
debug_decl(sudo_ldap_check_runas_user, SUDOERS_DEBUG_LDAP)
/* get the runas user from the entry */
bv = ldap_get_values_len(ld, entry, "sudoRunAsUser");
if (bv == NULL)
bv = ldap_get_values_len(ld, entry, "sudoRunAs"); /* old style */
if (bv == NULL) {
DPRINTF2("sudoRunAsUser: no result.");
if (*group_matched == UNSPEC) {
/* We haven't check for sudoRunAsGroup yet, check now. */
bv = ldap_get_values_len(ld, entry, "sudoRunAsGroup");
if (bv != NULL) {
*group_matched = false;
ldap_value_free_len(bv);
}
}
if (!ISSET(sudo_user.flags, RUNAS_USER_SPECIFIED))
debug_return_int(UNSPEC);
switch (*group_matched) {
case UNSPEC:
/*
* No runas user or group entries. Match runas_default
* against what the user specified on the command line.
*/
ret = userpw_matches(def_runas_default, runas_pw->pw_name, runas_pw);
break;
case true:
/*
* No runas user entries but have a matching runas group entry.
* If trying to run as the invoking user, allow it.
*/
if (strcmp(user_name, runas_pw->pw_name) == 0)
ret = true;
break;
}
debug_return_int(ret);
}
/*
* BUG:
*
* if runas is not specified on the command line, the only information
* as to which user to run as is in the runas_default option. We should
* check to see if we have the local option present. Unfortunately we
* don't parse these options until after this routine says yes or no.
* The query has already returned, so we could peek at the attribute
* values here though.
*
* For now just require users to always use -u option unless its set
* in the global defaults. This behaviour is no different than the global
* /etc/sudoers.
*
* Sigh - maybe add this feature later
*/
/* walk through values returned, looking for a match */
for (p = bv; *p != NULL && !ret; p++) {
val = (*p)->bv_val;
switch (val[0]) {
case '+':
if (netgr_matches(val, def_netgroup_tuple ? user_runhost : NULL,
def_netgroup_tuple ? user_srunhost : NULL, runas_pw->pw_name))
ret = true;
break;
case '%':
if (usergr_matches(val, runas_pw->pw_name, runas_pw))
ret = true;
break;
case '\0':
/* Empty RunAsUser means run as the invoking user. */
if (ISSET(sudo_user.flags, RUNAS_USER_SPECIFIED) &&
strcmp(user_name, runas_pw->pw_name) == 0)
ret = true;
break;
case 'A':
if (strcmp(val, "ALL") == 0) {
ret = true;
break;
}
/* FALLTHROUGH */
default:
if (userpw_matches(val, runas_pw->pw_name, runas_pw))
ret = true;
break;
}
DPRINTF2("ldap sudoRunAsUser '%s' ... %s", val, ret ? "MATCH!" : "not");
}
ldap_value_free_len(bv); /* cleanup */
debug_return_int(ret);
}
static int
sudo_ldap_check_runas_group(LDAP *ld, LDAPMessage *entry)
{
struct berval **bv, **p;
char *val;
bool ret = false;
debug_decl(sudo_ldap_check_runas_group, SUDOERS_DEBUG_LDAP)
/* get the values from the entry */
bv = ldap_get_values_len(ld, entry, "sudoRunAsGroup");
if (bv == NULL) {
DPRINTF2("sudoRunAsGroup: no result.");
if (!ISSET(sudo_user.flags, RUNAS_USER_SPECIFIED)) {
if (runas_pw->pw_gid == runas_gr->gr_gid)
ret = true; /* runas group matches passwd db */
}
debug_return_int(ret);
}
/* walk through values returned, looking for a match */
for (p = bv; *p != NULL && !ret; p++) {
val = (*p)->bv_val;
if (strcmp(val, "ALL") == 0 || group_matches(val, runas_gr))
ret = true;
DPRINTF2("ldap sudoRunAsGroup '%s' ... %s",
val, ret ? "MATCH!" : "not");
}
ldap_value_free_len(bv); /* cleanup */
debug_return_int(ret);
}
/*
* Walk through search results and return true if we have a runas match,
* else false. RunAs info is optional.
*/
static bool
sudo_ldap_check_runas(LDAP *ld, LDAPMessage *entry)
{
int user_matched = UNSPEC;
int group_matched = UNSPEC;
debug_decl(sudo_ldap_check_runas, SUDOERS_DEBUG_LDAP)
if (!entry)
debug_return_bool(false);
if (ISSET(sudo_user.flags, RUNAS_GROUP_SPECIFIED))
group_matched = sudo_ldap_check_runas_group(ld, entry);
user_matched = sudo_ldap_check_runas_user(ld, entry, &group_matched);
debug_return_bool(group_matched != false && user_matched != false);
}
/*
* Walk through search results and return true if we have a command match,
* false if disallowed and UNSPEC if not matched.
*/
static int
sudo_ldap_check_command(LDAP *ld, LDAPMessage *entry, int *setenv_implied)
{
struct sudo_digest digest, *allowed_digest = NULL;
struct berval **bv, **p;
char *allowed_cmnd, *allowed_args, *val;
int ret = UNSPEC;
bool negated;
debug_decl(sudo_ldap_check_command, SUDOERS_DEBUG_LDAP)
if (!entry)
debug_return_int(ret);
bv = ldap_get_values_len(ld, entry, "sudoCommand");
if (bv == NULL)
debug_return_int(ret);
for (p = bv; *p != NULL && ret != false; p++) {
val = (*p)->bv_val;
/* Match against ALL ? */
if (strcmp(val, "ALL") == 0) {
ret = true;
if (setenv_implied != NULL)
*setenv_implied = true;
DPRINTF2("ldap sudoCommand '%s' ... MATCH!", val);
continue;
}
/* check for sha-2 digest */
allowed_digest = sudo_ldap_extract_digest(&val, &digest);
/* check for !command */
allowed_cmnd = val;
negated = sudo_ldap_is_negated(&allowed_cmnd);
/* split optional args away from command */
allowed_args = strchr(allowed_cmnd, ' ');
if (allowed_args)
*allowed_args++ = '\0';
/* check the command like normal */
if (command_matches(allowed_cmnd, allowed_args, allowed_digest)) {
/*
* If allowed (no bang) set ret but keep on checking.
* If disallowed (bang), exit loop.
*/
ret = negated ? false : true;
}
if (allowed_args != NULL)
allowed_args[-1] = ' '; /* restore val */
DPRINTF2("ldap sudoCommand '%s' ... %s",
val, ret == true ? "MATCH!" : "not");
if (allowed_digest != NULL)
free(allowed_digest->digest_str);
}
ldap_value_free_len(bv); /* more cleanup */
debug_return_int(ret);
}
/*
* Search for boolean "option" in sudoOption.
* Returns true if found and allowed, false if negated, else UNSPEC.
*/
static int
sudo_ldap_check_bool(LDAP *ld, LDAPMessage *entry, char *option)
{
struct berval **bv, **p;
char *var;
bool negated;
int ret = UNSPEC;
debug_decl(sudo_ldap_check_bool, SUDOERS_DEBUG_LDAP)
if (entry == NULL)
debug_return_int(ret);
bv = ldap_get_values_len(ld, entry, "sudoOption");
if (bv == NULL)
debug_return_int(ret);
/* walk through options */
for (p = bv; *p != NULL; p++) {
var = (*p)->bv_val;
DPRINTF2("ldap sudoOption: '%s'", var);
negated = sudo_ldap_is_negated(&var);
if (strcmp(var, option) == 0)
ret = negated ? false : true;
}
ldap_value_free_len(bv);
debug_return_int(ret);
}
/*
* Read sudoOption and modify the defaults as we go. This is used once
* from the cn=defaults entry and also once when a final sudoRole is matched.
*/
static bool
sudo_ldap_parse_options(LDAP *ld, LDAPMessage *entry)
{
struct berval **bv, **p;
char *cn, *var, *val, *source = NULL;
bool ret = false;
int op;
debug_decl(sudo_ldap_parse_options, SUDOERS_DEBUG_LDAP)
bv = ldap_get_values_len(ld, entry, "sudoOption");
if (bv == NULL)
debug_return_bool(true);
/* get the entry's dn for option error reporting */
cn = sudo_ldap_get_first_rdn(ld, entry);
if (cn != NULL) {
if (asprintf(&source, "sudoRole %s", cn) == -1) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
source = NULL;
goto done;
}
}
/* walk through options, early ones first */
for (p = bv; *p != NULL; p++) {
struct early_default *early;
char *copy;
/* Avoid modifying bv as we need to use it again below. */
if ((copy = strdup((*p)->bv_val)) == NULL) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
goto done;
}
op = sudo_ldap_parse_option(copy, &var, &val);
early = is_early_default(var);
if (early != NULL) {
set_early_default(var, val, op,
source ? source : "sudoRole UNKNOWN", 0, false, early);
}
free(copy);
}
run_early_defaults();
/* walk through options again, skipping early ones */
for (p = bv; *p != NULL; p++) {
op = sudo_ldap_parse_option((*p)->bv_val, &var, &val);
if (is_early_default(var) == NULL) {
set_default(var, val, op,
source ? source : "sudoRole UNKNOWN", 0, false);
}
}
ret = true;
done:
free(source);
if (cn)
ldap_memfree(cn);
ldap_value_free_len(bv);
debug_return_bool(ret);
}
/*
* Build an LDAP timefilter.
*
* Stores a filter in the buffer that makes sure only entries
* are selected that have a sudoNotBefore in the past and a
* sudoNotAfter in the future, i.e. a filter of the following
* structure (spaced out a little more for better readability:
*
* (&
* (|
* (!(sudoNotAfter=*))
* (sudoNotAfter>__now__)
* )
* (|
* (!(sudoNotBefore=*))
* (sudoNotBefore<__now__)
* )
* )
*
* If either the sudoNotAfter or sudoNotBefore attributes are missing,
* no time restriction shall be imposed.
*/
static bool
sudo_ldap_timefilter(char *buffer, size_t buffersize)
{
struct tm *tp;
time_t now;
char timebuffer[sizeof("20120727121554.0Z")];
int len = -1;
debug_decl(sudo_ldap_timefilter, SUDOERS_DEBUG_LDAP)
/* Make sure we have a formatted timestamp for __now__. */
time(&now);
if ((tp = gmtime(&now)) == NULL) {
sudo_warn(U_("unable to get GMT time"));
goto done;
}
/* Format the timestamp according to the RFC. */
if (strftime(timebuffer, sizeof(timebuffer), "%Y%m%d%H%M%S.0Z", tp) == 0) {
sudo_warnx(U_("unable to format timestamp"));
goto done;
}
/* Build filter. */
len = snprintf(buffer, buffersize, "(&(|(!(sudoNotAfter=*))(sudoNotAfter>=%s))(|(!(sudoNotBefore=*))(sudoNotBefore<=%s)))",
timebuffer, timebuffer);
if (len <= 0 || (size_t)len >= buffersize) {
sudo_warnx(U_("internal error, %s overflow"), __func__);
len = -1;
}
done:
debug_return_bool(len != -1);
}
/*
* Builds up a filter to search for default settings
*/
static char *
sudo_ldap_build_default_filter(void)
{
char *filt;
debug_decl(sudo_ldap_build_default_filter, SUDOERS_DEBUG_LDAP)
if (!ldap_conf.search_filter)
debug_return_str(strdup("cn=defaults"));
if (asprintf(&filt, "(&%s(cn=defaults))", ldap_conf.search_filter) == -1)
debug_return_str(NULL);
debug_return_str(filt);
}
/*
* Determine length of query value after escaping characters
* as per RFC 4515.
*/
static size_t
sudo_ldap_value_len(const char *value)
{
const char *s;
size_t len = 0;
for (s = value; *s != '\0'; s++) {
switch (*s) {
case '\\':
case '(':
case ')':
case '*':
len += 2;
break;
}
}
len += (size_t)(s - value);
return len;
}
/*
* Like strlcat() but escapes characters as per RFC 4515.
*/
static size_t
sudo_ldap_value_cat(char *dst, const char *src, size_t size)
{
char *d = dst;
const char *s = src;
size_t n = size;
size_t dlen;
/* Find the end of dst and adjust bytes left but don't go past end */
while (n-- != 0 && *d != '\0')
d++;
dlen = d - dst;
n = size - dlen;
if (n == 0)
return dlen + strlen(s);
while (*s != '\0') {
switch (*s) {
case '\\':
if (n < 3)
goto done;
*d++ = '\\';
*d++ = '5';
*d++ = 'c';
n -= 3;
break;
case '(':
if (n < 3)
goto done;
*d++ = '\\';
*d++ = '2';
*d++ = '8';
n -= 3;
break;
case ')':
if (n < 3)
goto done;
*d++ = '\\';
*d++ = '2';
*d++ = '9';
n -= 3;
break;
case '*':
if (n < 3)
goto done;
*d++ = '\\';
*d++ = '2';
*d++ = 'a';
n -= 3;
break;
default:
if (n < 1)
goto done;
*d++ = *s;
n--;
break;
}
s++;
}
done:
*d = '\0';
while (*s != '\0')
s++;
return dlen + (s - src); /* count does not include NUL */
}
/*
* Like strdup() but escapes characters as per RFC 4515.
*/
static char *
sudo_ldap_value_dup(const char *src)
{
char *dst;
size_t size;
size = sudo_ldap_value_len(src) + 1;
dst = malloc(size);
if (dst == NULL)
return NULL;
*dst = '\0';
if (sudo_ldap_value_cat(dst, src, size) >= size) {
/* Should not be possible... */
free(dst);
dst = NULL;
}
return dst;
}
/*
* Check the netgroups list beginning at "start" for nesting.
* Parent nodes with a memberNisNetgroup that match one of the
* netgroups are added to the list and checked for further nesting.
* Return true on success or false if there was an internal overflow.
*/
static bool
sudo_netgroup_lookup_nested(LDAP *ld, char *base, struct timeval *timeout,
struct ldap_netgroup_list *netgroups, struct ldap_netgroup *start)
{
LDAPMessage *entry, *result;
size_t filt_len;
char *filt;
int rc;
debug_decl(sudo_netgroup_lookup_nested, SUDOERS_DEBUG_LDAP);
DPRINTF1("Checking for nested netgroups from netgroup_base '%s'", base);
do {
struct ldap_netgroup *ng, *old_tail;
result = NULL;
old_tail = STAILQ_LAST(netgroups, ldap_netgroup, entries);
filt_len = strlen(ldap_conf.netgroup_search_filter) + 7;
for (ng = start; ng != NULL; ng = STAILQ_NEXT(ng, entries)) {
filt_len += sudo_ldap_value_len(ng->name) + 20;
}
if ((filt = malloc(filt_len)) == NULL)
goto oom;
CHECK_STRLCPY(filt, "(&", filt_len);
CHECK_STRLCAT(filt, ldap_conf.netgroup_search_filter, filt_len);
CHECK_STRLCAT(filt, "(|", filt_len);
for (ng = start; ng != NULL; ng = STAILQ_NEXT(ng, entries)) {
CHECK_STRLCAT(filt, "(memberNisNetgroup=", filt_len);
CHECK_LDAP_VCAT(filt, ng->name, filt_len);
CHECK_STRLCAT(filt, ")", filt_len);
}
CHECK_STRLCAT(filt, "))", filt_len);
DPRINTF1("ldap netgroup search filter: '%s'", filt);
rc = ldap_search_ext_s(ld, base, LDAP_SCOPE_SUBTREE, filt,
NULL, 0, NULL, NULL, timeout, 0, &result);
free(filt);
if (rc == LDAP_SUCCESS) {
LDAP_FOREACH(entry, ld, result) {
struct berval **bv;
bv = ldap_get_values_len(ld, entry, "cn");
if (bv != NULL) {
/* Don't add a netgroup twice. */
STAILQ_FOREACH(ng, netgroups, entries) {
/* Assumes only one cn per entry. */
if (strcasecmp(ng->name, (*bv)->bv_val) == 0)
break;
}
if (ng == NULL) {
ng = malloc(sizeof(*ng));
if (ng == NULL ||
(ng->name = strdup((*bv)->bv_val)) == NULL) {
free(ng);
ldap_value_free_len(bv);
goto oom;
}
#ifdef __clang_analyzer__
/* clang analyzer false positive */
if (__builtin_expect(netgroups->stqh_last == NULL, 0))
__builtin_trap();
#endif
STAILQ_INSERT_TAIL(netgroups, ng, entries);
DPRINTF1("Found new netgroup %s for %s", ng->name, base);
}
ldap_value_free_len(bv);
}
}
}
ldap_msgfree(result);
/* Check for nested netgroups in what we added. */
start = old_tail ? STAILQ_NEXT(old_tail, entries) : STAILQ_FIRST(netgroups);
} while (start != NULL);
debug_return_bool(true);
oom:
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
ldap_msgfree(result);
debug_return_bool(false);
overflow:
sudo_warnx(U_("internal error, %s overflow"), __func__);
free(filt);
debug_return_bool(false);
}
/*
* Look up netgroups that the specified user is a member of.
* Appends new entries to the netgroups list.
* Return true on success or false if there was an internal overflow.
*/
static bool
sudo_netgroup_lookup(LDAP *ld, struct passwd *pw,
struct ldap_netgroup_list *netgroups)
{
struct ldap_config_str *base;
struct ldap_netgroup *ng, *old_tail;
struct timeval tv, *tvp = NULL;
LDAPMessage *entry, *result = NULL;
const char *domain;
char *escaped_domain = NULL, *escaped_user = NULL;
char *escaped_host = NULL, *escaped_shost = NULL, *filt = NULL;
int filt_len, rc;
bool ret = false;
debug_decl(sudo_netgroup_lookup, SUDOERS_DEBUG_LDAP);
if (ldap_conf.timeout > 0) {
tv.tv_sec = ldap_conf.timeout;
tv.tv_usec = 0;
tvp = &tv;
}
/* Use NIS domain if set, else wildcard match. */
domain = sudo_getdomainname();
/* Escape the domain, host names, and user name per RFC 4515. */
if (domain != NULL) {
if ((escaped_domain = sudo_ldap_value_dup(domain)) == NULL)
goto oom;
}
if ((escaped_user = sudo_ldap_value_dup(pw->pw_name)) == NULL)
goto oom;
if (def_netgroup_tuple) {
escaped_host = sudo_ldap_value_dup(user_runhost);
if (user_runhost == user_srunhost)
escaped_shost = escaped_host;
else
escaped_shost = sudo_ldap_value_dup(user_srunhost);
if (escaped_host == NULL || escaped_shost == NULL)
goto oom;
}
/* Build query, using NIS domain if it is set. */
if (domain != NULL) {
if (escaped_host != escaped_shost) {
filt_len = asprintf(&filt, "(&%s(|"
"(nisNetgroupTriple=\\28,%s,%s\\29)"
"(nisNetgroupTriple=\\28%s,%s,%s\\29)"
"(nisNetgroupTriple=\\28%s,%s,%s\\29)"
"(nisNetgroupTriple=\\28,%s,\\29)"
"(nisNetgroupTriple=\\28%s,%s,\\29)"
"(nisNetgroupTriple=\\28%s,%s,\\29)))",
ldap_conf.netgroup_search_filter, escaped_user, escaped_domain,
escaped_shost, escaped_user, escaped_domain,
escaped_host, escaped_user, escaped_domain, escaped_user,
escaped_shost, escaped_user, escaped_host, escaped_user);
} else if (escaped_shost != NULL) {
filt_len = asprintf(&filt, "(&%s(|"
"(nisNetgroupTriple=\\28,%s,%s\\29)"
"(nisNetgroupTriple=\\28%s,%s,%s\\29)"
"(nisNetgroupTriple=\\28,%s,\\29)"
"(nisNetgroupTriple=\\28%s,%s,\\29)))",
ldap_conf.netgroup_search_filter, escaped_user, escaped_domain,
escaped_shost, escaped_user, escaped_domain,
escaped_user, escaped_shost, escaped_user);
} else {
filt_len = asprintf(&filt, "(&%s(|"
"(nisNetgroupTriple=\\28*,%s,%s\\29)"
"(nisNetgroupTriple=\\28*,%s,\\29)))",
ldap_conf.netgroup_search_filter, escaped_user, escaped_domain,
escaped_user);
}
} else {
if (escaped_host != escaped_shost) {
filt_len = asprintf(&filt, "(&%s(|"
"(nisNetgroupTriple=\\28,%s,*\\29)"
"(nisNetgroupTriple=\\28%s,%s,*\\29)"
"(nisNetgroupTriple=\\28%s,%s,*\\29)))",
ldap_conf.netgroup_search_filter, escaped_user,
escaped_shost, escaped_user, escaped_host, escaped_user);
} else if (escaped_shost != NULL) {
filt_len = asprintf(&filt, "(&%s(|"
"(nisNetgroupTriple=\\28,%s,*\\29)"
"(nisNetgroupTriple=\\28%s,%s,*\\29)))",
ldap_conf.netgroup_search_filter, escaped_user,
escaped_shost, escaped_user);
} else {
filt_len = asprintf(&filt,
"(&%s(|(nisNetgroupTriple=\\28*,%s,*\\29)))",
ldap_conf.netgroup_search_filter, escaped_user);
}
}
if (filt_len == -1)
goto oom;
DPRINTF1("ldap netgroup search filter: '%s'", filt);
STAILQ_FOREACH(base, &ldap_conf.netgroup_base, entries) {
DPRINTF1("searching from netgroup_base '%s'", base->val);
rc = ldap_search_ext_s(ld, base->val, LDAP_SCOPE_SUBTREE, filt,
NULL, 0, NULL, NULL, tvp, 0, &result);
if (rc != LDAP_SUCCESS) {
DPRINTF1("ldap netgroup search failed: %s", ldap_err2string(rc));
ldap_msgfree(result);
continue;
}
old_tail = STAILQ_LAST(netgroups, ldap_netgroup, entries);
LDAP_FOREACH(entry, ld, result) {
struct berval **bv;
bv = ldap_get_values_len(ld, entry, "cn");
if (bv != NULL) {
/* Don't add a netgroup twice. */
STAILQ_FOREACH(ng, netgroups, entries) {
/* Assumes only one cn per entry. */
if (strcasecmp(ng->name, (*bv)->bv_val) == 0)
break;
}
if (ng == NULL) {
ng = malloc(sizeof(*ng));
if (ng == NULL ||
(ng->name = strdup((*bv)->bv_val)) == NULL) {
free(ng);
ldap_value_free_len(bv);
goto oom;
}
STAILQ_INSERT_TAIL(netgroups, ng, entries);
DPRINTF1("Found new netgroup %s for %s", ng->name,
base->val);
}
ldap_value_free_len(bv);
}
}
ldap_msgfree(result);
result = NULL;
/* Check for nested netgroups in what we added. */
ng = old_tail ? STAILQ_NEXT(old_tail, entries) : STAILQ_FIRST(netgroups);
if (ng != NULL) {
if (!sudo_netgroup_lookup_nested(ld, base->val, tvp, netgroups, ng))
goto done;
}
}
ret = true;
goto done;
oom:
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
done:
free(escaped_domain);
free(escaped_user);
free(escaped_host);
if (escaped_host != escaped_shost)
free(escaped_shost);
free(filt);
ldap_msgfree(result);
debug_return_bool(ret);
}
/*
* Builds up a filter to check against LDAP.
*/
static char *
sudo_ldap_build_pass1(LDAP *ld, struct passwd *pw)
{
char *buf, timebuffer[TIMEFILTER_LENGTH + 1], gidbuf[MAX_UID_T_LEN + 1];
struct ldap_netgroup_list netgroups;
struct ldap_netgroup *ng = NULL;
struct gid_list *gidlist;
struct group_list *grlist;
struct group *grp;
size_t sz = 0;
int i;
debug_decl(sudo_ldap_build_pass1, SUDOERS_DEBUG_LDAP)
STAILQ_INIT(&netgroups);
/* If there is a filter, allocate space for the global AND. */
if (ldap_conf.timed || ldap_conf.search_filter)
sz += 3;
/* Add LDAP search filter if present. */
if (ldap_conf.search_filter)
sz += strlen(ldap_conf.search_filter);
/* Then add (|(sudoUser=USERNAME)(sudoUser=ALL)) + NUL */
sz += 29 + sudo_ldap_value_len(pw->pw_name);
/* Add space for primary and supplementary groups and gids */
if ((grp = sudo_getgrgid(pw->pw_gid)) != NULL) {
sz += 12 + sudo_ldap_value_len(grp->gr_name);
}
sz += 13 + MAX_UID_T_LEN;
if ((grlist = sudo_get_grlist(pw)) != NULL) {
for (i = 0; i < grlist->ngroups; i++) {
if (grp != NULL && strcasecmp(grlist->groups[i], grp->gr_name) == 0)
continue;
sz += 12 + sudo_ldap_value_len(grlist->groups[i]);
}
}
if ((gidlist = sudo_get_gidlist(pw, ENTRY_TYPE_ANY)) != NULL) {
for (i = 0; i < gidlist->ngids; i++) {
if (pw->pw_gid == gidlist->gids[i])
continue;
sz += 13 + MAX_UID_T_LEN;
}
}
/* Add space for user netgroups if netgroup_base specified. */
if (!STAILQ_EMPTY(&ldap_conf.netgroup_base)) {
DPRINTF1("Looking up netgroups for %s", pw->pw_name);
if (sudo_netgroup_lookup(ld, pw, &netgroups)) {
STAILQ_FOREACH(ng, &netgroups, entries) {
sz += 14 + strlen(ng->name);
}
} else {
/* sudo_netgroup_lookup() failed, clean up. */
while ((ng = STAILQ_FIRST(&netgroups)) != NULL) {
STAILQ_REMOVE_HEAD(&netgroups, entries);
free(ng->name);
free(ng);
}
}
}
/* If timed, add space for time limits. */
if (ldap_conf.timed)
sz += TIMEFILTER_LENGTH;
if ((buf = malloc(sz)) == NULL) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
goto bad;
}
*buf = '\0';
/*
* If timed or using a search filter, start a global AND clause to
* contain the search filter, search criteria, and time restriction.
*/
if (ldap_conf.timed || ldap_conf.search_filter)
CHECK_STRLCPY(buf, "(&", sz);
if (ldap_conf.search_filter)
CHECK_STRLCAT(buf, ldap_conf.search_filter, sz);
/* Global OR + sudoUser=user_name filter */
CHECK_STRLCAT(buf, "(|(sudoUser=", sz);
CHECK_LDAP_VCAT(buf, pw->pw_name, sz);
CHECK_STRLCAT(buf, ")", sz);
/* Append primary group and gid */
if (grp != NULL) {
CHECK_STRLCAT(buf, "(sudoUser=%", sz);
CHECK_LDAP_VCAT(buf, grp->gr_name, sz);
CHECK_STRLCAT(buf, ")", sz);
}
(void) snprintf(gidbuf, sizeof(gidbuf), "%u", (unsigned int)pw->pw_gid);
CHECK_STRLCAT(buf, "(sudoUser=%#", sz);
CHECK_STRLCAT(buf, gidbuf, sz);
CHECK_STRLCAT(buf, ")", sz);
/* Append supplementary groups and gids */
if (grlist != NULL) {
for (i = 0; i < grlist->ngroups; i++) {
if (grp != NULL && strcasecmp(grlist->groups[i], grp->gr_name) == 0)
continue;
CHECK_STRLCAT(buf, "(sudoUser=%", sz);
CHECK_LDAP_VCAT(buf, grlist->groups[i], sz);
CHECK_STRLCAT(buf, ")", sz);
}
}
if (gidlist != NULL) {
for (i = 0; i < gidlist->ngids; i++) {
if (pw->pw_gid == gidlist->gids[i])
continue;
(void) snprintf(gidbuf, sizeof(gidbuf), "%u",
(unsigned int)gidlist->gids[i]);
CHECK_STRLCAT(buf, "(sudoUser=%#", sz);
CHECK_STRLCAT(buf, gidbuf, sz);
CHECK_STRLCAT(buf, ")", sz);
}
}
/* Done with groups. */
if (gidlist != NULL)
sudo_gidlist_delref(gidlist);
if (grlist != NULL)
sudo_grlist_delref(grlist);
if (grp != NULL)
sudo_gr_delref(grp);
/* Add netgroups (if any), freeing the list as we go. */
while ((ng = STAILQ_FIRST(&netgroups)) != NULL) {
STAILQ_REMOVE_HEAD(&netgroups, entries);
CHECK_STRLCAT(buf, "(sudoUser=+", sz);
CHECK_LDAP_VCAT(buf, ng->name, sz);
CHECK_STRLCAT(buf, ")", sz);
free(ng->name);
free(ng);
}
/* Add ALL to list and end the global OR. */
CHECK_STRLCAT(buf, "(sudoUser=ALL)", sz);
/* Add the time restriction, or simply end the global OR. */
if (ldap_conf.timed) {
CHECK_STRLCAT(buf, ")", sz); /* closes the global OR */
if (!sudo_ldap_timefilter(timebuffer, sizeof(timebuffer)))
goto bad;
CHECK_STRLCAT(buf, timebuffer, sz);
} else if (ldap_conf.search_filter) {
CHECK_STRLCAT(buf, ")", sz); /* closes the global OR */
}
CHECK_STRLCAT(buf, ")", sz); /* closes the global OR or the global AND */
debug_return_str(buf);
overflow:
sudo_warnx(U_("internal error, %s overflow"), __func__);
if (ng != NULL) {
/* Overflow while traversing netgroups. */
free(ng->name);
free(ng);
}
bad:
while ((ng = STAILQ_FIRST(&netgroups)) != NULL) {
STAILQ_REMOVE_HEAD(&netgroups, entries);
free(ng->name);
free(ng);
}
free(buf);
debug_return_str(NULL);
}
/*
* Builds up a filter to check against non-Unix group
* entries in LDAP, including netgroups.
*/
static char *
sudo_ldap_build_pass2(void)
{
char *filt, timebuffer[TIMEFILTER_LENGTH + 1];
bool query_netgroups = def_use_netgroups;
int len;
debug_decl(sudo_ldap_build_pass2, SUDOERS_DEBUG_LDAP)
/* No need to query netgroups if using netgroup_base. */
if (!STAILQ_EMPTY(&ldap_conf.netgroup_base))
query_netgroups = false;
/* Short circuit if no netgroups and no non-Unix groups. */
if (!query_netgroups && !def_group_plugin) {
errno = ENOENT;
debug_return_str(NULL);
}
if (ldap_conf.timed) {
if (!sudo_ldap_timefilter(timebuffer, sizeof(timebuffer)))
debug_return_str(NULL);
}
/*
* Match all sudoUsers beginning with '+' or '%:'.
* If a search filter or time restriction is specified,
* those get ANDed in to the expression.
*/
if (query_netgroups && def_group_plugin) {
len = asprintf(&filt, "%s%s(|(sudoUser=+*)(sudoUser=%%:*))%s%s",
(ldap_conf.timed || ldap_conf.search_filter) ? "(&" : "",
ldap_conf.search_filter ? ldap_conf.search_filter : "",
ldap_conf.timed ? timebuffer : "",
(ldap_conf.timed || ldap_conf.search_filter) ? ")" : "");
} else {
len = asprintf(&filt, "(&%s(sudoUser=*)(sudoUser=%s*)%s)",
ldap_conf.search_filter ? ldap_conf.search_filter : "",
query_netgroups ? "+" : "%:",
ldap_conf.timed ? timebuffer : "");
}
if (len == -1)
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
debug_return_str(filt);
}
/*
* Extract the dn from an entry and return the first rdn from it.
*/
static char *
sudo_ldap_get_first_rdn(LDAP *ld, LDAPMessage *entry)
{
#ifdef HAVE_LDAP_STR2DN
char *dn, *rdn = NULL;
LDAPDN tmpDN;
debug_decl(sudo_ldap_get_first_rdn, SUDOERS_DEBUG_LDAP)
if ((dn = ldap_get_dn(ld, entry)) == NULL)
debug_return_str(NULL);
if (ldap_str2dn(dn, &tmpDN, LDAP_DN_FORMAT_LDAP) == LDAP_SUCCESS) {
ldap_rdn2str(tmpDN[0], &rdn, LDAP_DN_FORMAT_UFN);
ldap_dnfree(tmpDN);
}
ldap_memfree(dn);
debug_return_str(rdn);
#else
char *dn, **edn;
debug_decl(sudo_ldap_get_first_rdn, SUDOERS_DEBUG_LDAP)
if ((dn = ldap_get_dn(ld, entry)) == NULL)
return NULL;
edn = ldap_explode_dn(dn, 1);
ldap_memfree(dn);
debug_return_str(edn ? edn[0] : NULL);
#endif
}
/*
* Fetch and display the global Options.
*/
static int
sudo_ldap_display_defaults(struct sudo_nss *nss, struct passwd *pw,
struct sudo_lbuf *lbuf)
{
struct berval **bv, **p;
struct timeval tv, *tvp = NULL;
struct ldap_config_str *base;
struct sudo_ldap_handle *handle = nss->handle;
LDAP *ld;
LDAPMessage *entry, *result;
char *prefix, *filt;
int rc, count = 0;
debug_decl(sudo_ldap_display_defaults, SUDOERS_DEBUG_LDAP)
if (handle == NULL || handle->ld == NULL)
goto done;
ld = handle->ld;
filt = sudo_ldap_build_default_filter();
if (filt == NULL) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
count = -1;
goto done;
}
STAILQ_FOREACH(base, &ldap_conf.base, entries) {
if (ldap_conf.timeout > 0) {
tv.tv_sec = ldap_conf.timeout;
tv.tv_usec = 0;
tvp = &tv;
}
result = NULL;
rc = ldap_search_ext_s(ld, base->val, LDAP_SCOPE_SUBTREE,
filt, NULL, 0, NULL, NULL, tvp, 0, &result);
if (rc == LDAP_SUCCESS && (entry = ldap_first_entry(ld, result))) {
bv = ldap_get_values_len(ld, entry, "sudoOption");
if (bv != NULL) {
if (lbuf->len == 0 || isspace((unsigned char)lbuf->buf[lbuf->len - 1]))
prefix = " ";
else
prefix = ", ";
for (p = bv; *p != NULL; p++) {
struct defaults d;
sudo_lbuf_append(lbuf, "%s", prefix);
d.op = sudo_ldap_parse_option((*p)->bv_val, &d.var, &d.val);
sudoers_format_default(lbuf, &d);
prefix = ", ";
count++;
}
ldap_value_free_len(bv);
}
}
ldap_msgfree(result);
}
free(filt);
done:
if (sudo_lbuf_error(lbuf))
debug_return_int(-1);
debug_return_int(count);
}
/*
* STUB
*/
static int
sudo_ldap_display_bound_defaults(struct sudo_nss *nss, struct passwd *pw,
struct sudo_lbuf *lbuf)
{
debug_decl(sudo_ldap_display_bound_defaults, SUDOERS_DEBUG_LDAP)
debug_return_int(0);
}
static char *
berval_iter(void **vp)
{
struct berval **bv = *vp;
*vp = bv + 1;
return *bv ? (*bv)->bv_val : NULL;
}
static struct userspec_list *
ldap_to_sudoers(LDAP *ld, struct ldap_result *lres)
{
struct userspec_list *ldap_userspecs;
struct userspec *us;
struct member *m;
unsigned int i;
debug_decl(ldap_to_sudoers, SUDOERS_DEBUG_LDAP)
if ((ldap_userspecs = calloc(1, sizeof(*ldap_userspecs))) == NULL)
goto oom;
TAILQ_INIT(ldap_userspecs);
/* We only have a single userspec */
if ((us = calloc(1, sizeof(*us))) == NULL)
goto oom;
TAILQ_INIT(&us->users);
TAILQ_INIT(&us->privileges);
TAILQ_INSERT_TAIL(ldap_userspecs, us, entries);
/* The user has already matched, use ALL as wildcard. */
if ((m = calloc(1, sizeof(*m))) == NULL)
goto oom;
m->type = ALL;
TAILQ_INSERT_TAIL(&us->users, m, entries);
/* Treat each sudoRole as a separate privilege. */
for (i = 0; i < lres->nentries; i++) {
LDAPMessage *entry = lres->entries[i].entry;
struct berval **cmnds, **runasusers, **runasgroups;
struct berval **opts, **notbefore, **notafter;
struct privilege *priv;
char *cn;
/* Ignore sudoRole without sudoCommand. */
cmnds = ldap_get_values_len(ld, entry, "sudoCommand");
if (cmnds == NULL)
continue;
/* Get the entry's dn for long format printing. */
cn = sudo_ldap_get_first_rdn(ld, entry);
/* Get sudoRunAsUser / sudoRunAsGroup */
runasusers = ldap_get_values_len(ld, entry, "sudoRunAsUser");
if (runasusers == NULL)
runasusers = ldap_get_values_len(ld, entry, "sudoRunAs");
runasgroups = ldap_get_values_len(ld, entry, "sudoRunAsGroup");
/* Get sudoNotBefore / sudoNotAfter */
notbefore = ldap_get_values_len(ld, entry, "sudoNotBefore");
notafter = ldap_get_values_len(ld, entry, "sudoNotAfter");
/* Parse sudoOptions. */
opts = ldap_get_values_len(ld, entry, "sudoOption");
priv = sudo_ldap_role_to_priv(cn, NULL, runasusers, runasgroups,
cmnds, opts, notbefore ? notbefore[0]->bv_val : NULL,
notafter ? notafter[0]->bv_val : NULL, false, long_list,
berval_iter);
/* Cleanup */
if (cn != NULL)
ldap_memfree(cn);
if (cmnds != NULL)
ldap_value_free_len(cmnds);
if (runasusers != NULL)
ldap_value_free_len(runasusers);
if (runasgroups != NULL)
ldap_value_free_len(runasgroups);
if (opts != NULL)
ldap_value_free_len(opts);
if (notbefore != NULL)
ldap_value_free_len(notbefore);
if (notafter != NULL)
ldap_value_free_len(notafter);
if (priv == NULL)
goto oom;
TAILQ_INSERT_TAIL(&us->privileges, priv, entries);
}
debug_return_ptr(ldap_userspecs);
oom:
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
if (ldap_userspecs != NULL) {
while ((us = TAILQ_FIRST(ldap_userspecs)) != NULL) {
TAILQ_REMOVE(ldap_userspecs, us, entries);
free_userspec(us);
}
free(ldap_userspecs);
}
debug_return_ptr(NULL);
}
/*
* Like sudo_ldap_lookup(), except we just print entries.
*/
static int
sudo_ldap_display_privs(struct sudo_nss *nss, struct passwd *pw,
struct sudo_lbuf *lbuf)
{
struct sudo_ldap_handle *handle = nss->handle;
struct userspec_list *ldap_userspecs = NULL;
struct ldap_result *lres;
LDAP *ld;
int ret = 0;
debug_decl(sudo_ldap_display_privs, SUDOERS_DEBUG_LDAP)
if (handle == NULL || handle->ld == NULL)
goto done;
ld = handle->ld;
DPRINTF1("ldap search for command list");
lres = sudo_ldap_result_get(nss, pw);
if (lres == NULL)
goto done;
/* Convert to sudoers parse tree. */
if ((ldap_userspecs = ldap_to_sudoers(ld, lres)) == NULL) {
ret = -1;
goto done;
}
/* Call common display code. */
ret = sudo_display_userspecs(ldap_userspecs, pw, lbuf);
done:
if (ldap_userspecs != NULL) {
struct userspec *us;
while ((us = TAILQ_FIRST(ldap_userspecs)) != NULL) {
TAILQ_REMOVE(ldap_userspecs, us, entries);
free_userspec(us);
}
free(ldap_userspecs);
}
if (sudo_lbuf_error(lbuf))
debug_return_int(-1);
debug_return_int(ret);
}
static int
sudo_ldap_display_cmnd(struct sudo_nss *nss, struct passwd *pw)
{
struct sudo_ldap_handle *handle = nss->handle;
LDAP *ld;
struct ldap_result *lres;
LDAPMessage *entry;
bool found = false;
unsigned int i;
debug_decl(sudo_ldap_display_cmnd, SUDOERS_DEBUG_LDAP)
if (handle == NULL || handle->ld == NULL)
goto done;
ld = handle->ld;
/*
* The sudo_ldap_result_get() function returns all nodes that match
* the user and the host.
*/
DPRINTF1("ldap search for command list");
lres = sudo_ldap_result_get(nss, pw);
if (lres == NULL)
goto done;
for (i = 0; i < lres->nentries; i++) {
entry = lres->entries[i].entry;
if (!sudo_ldap_check_runas(ld, entry))
continue;
if (sudo_ldap_check_command(ld, entry, NULL) == true) {
found = true;
goto done;
}
}
done:
if (found)
sudo_printf(SUDO_CONV_INFO_MSG, "%s%s%s\n",
safe_cmnd ? safe_cmnd : user_cmnd,
user_args ? " " : "", user_args ? user_args : "");
debug_return_int(!found);
}
#ifdef HAVE_LDAP_SASL_INTERACTIVE_BIND_S
static unsigned int (*sudo_gss_krb5_ccache_name)(unsigned int *minor_status, const char *name, const char **old_name);
static int
sudo_set_krb5_ccache_name(const char *name, const char **old_name)
{
int ret = 0;
unsigned int junk;
static bool initialized;
debug_decl(sudo_set_krb5_ccache_name, SUDOERS_DEBUG_LDAP)
if (!initialized) {
sudo_gss_krb5_ccache_name =
sudo_dso_findsym(SUDO_DSO_DEFAULT, "gss_krb5_ccache_name");
initialized = true;
}
/*
* Try to use gss_krb5_ccache_name() if possible.
* We also need to set KRB5CCNAME since some LDAP libs may not use
* gss_krb5_ccache_name().
*/
if (sudo_gss_krb5_ccache_name != NULL) {
ret = sudo_gss_krb5_ccache_name(&junk, name, old_name);
} else {
/* No gss_krb5_ccache_name(), fall back on KRB5CCNAME. */
if (old_name != NULL)
*old_name = sudo_getenv("KRB5CCNAME");
}
if (name != NULL && *name != '\0') {
if (sudo_setenv("KRB5CCNAME", name, true) == -1)
ret = -1;
} else {
if (sudo_unsetenv("KRB5CCNAME") == -1)
ret = -1;
}
debug_return_int(ret);
}
/*
* Make a copy of the credential cache file specified by KRB5CCNAME
* which must be readable by the user. The resulting cache file
* is root-owned and will be removed after authenticating via SASL.
*/
static char *
sudo_krb5_copy_cc_file(const char *old_ccname)
{
int nfd, ofd = -1;
ssize_t nread, nwritten = -1;
static char new_ccname[sizeof(_PATH_TMP) + sizeof("sudocc_XXXXXXXX") - 1];
char buf[10240], *ret = NULL;
debug_decl(sudo_krb5_copy_cc_file, SUDOERS_DEBUG_LDAP)
old_ccname = sudo_krb5_ccname_path(old_ccname);
if (old_ccname != NULL) {
/* Open credential cache as user to prevent stolen creds. */
if (!set_perms(PERM_USER))
goto done;
ofd = open(old_ccname, O_RDONLY|O_NONBLOCK);
if (!restore_perms())
goto done;
if (ofd != -1) {
(void) fcntl(ofd, F_SETFL, 0);
if (sudo_lock_file(ofd, SUDO_LOCK)) {
snprintf(new_ccname, sizeof(new_ccname), "%s%s",
_PATH_TMP, "sudocc_XXXXXXXX");
nfd = mkstemp(new_ccname);
if (nfd != -1) {
sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
"copy ccache %s -> %s", old_ccname, new_ccname);
while ((nread = read(ofd, buf, sizeof(buf))) > 0) {
ssize_t off = 0;
do {
nwritten = write(nfd, buf + off, nread - off);
if (nwritten == -1) {
sudo_warn("error writing to %s", new_ccname);
goto write_error;
}
off += nwritten;
} while (off < nread);
}
if (nread == -1)
sudo_warn("unable to read %s", new_ccname);
write_error:
close(nfd);
if (nread != -1 && nwritten != -1) {
ret = new_ccname; /* success! */
} else {
unlink(new_ccname); /* failed */
}
} else {
sudo_warn("unable to create temp file %s", new_ccname);
}
}
} else {
sudo_debug_printf(SUDO_DEBUG_WARN|SUDO_DEBUG_LINENO|SUDO_DEBUG_ERRNO,
"unable to open %s", old_ccname);
}
}
done:
if (ofd != -1)
close(ofd);
debug_return_str(ret);
}
static int
sudo_ldap_sasl_interact(LDAP *ld, unsigned int flags, void *_auth_id,
void *_interact)
{
char *auth_id = (char *)_auth_id;
sasl_interact_t *interact = (sasl_interact_t *)_interact;
int ret = LDAP_SUCCESS;
debug_decl(sudo_ldap_sasl_interact, SUDOERS_DEBUG_LDAP)
for (; interact->id != SASL_CB_LIST_END; interact++) {
if (interact->id != SASL_CB_USER) {
sudo_warnx("sudo_ldap_sasl_interact: unexpected interact id %lu",
interact->id);
ret = LDAP_PARAM_ERROR;
break;
}
if (auth_id != NULL)
interact->result = auth_id;
else if (interact->defresult != NULL)
interact->result = interact->defresult;
else
interact->result = "";
interact->len = strlen(interact->result);
#if SASL_VERSION_MAJOR < 2
interact->result = strdup(interact->result);
if (interact->result == NULL) {
ret = LDAP_NO_MEMORY;
break;
}
#endif /* SASL_VERSION_MAJOR < 2 */
DPRINTF2("sudo_ldap_sasl_interact: SASL_CB_USER %s",
(const char *)interact->result);
}
debug_return_int(ret);
}
#endif /* HAVE_LDAP_SASL_INTERACTIVE_BIND_S */
/*
* Create a new sudo_ldap_result structure.
*/
static struct ldap_result *
sudo_ldap_result_alloc(void)
{
struct ldap_result *result;
debug_decl(sudo_ldap_result_alloc, SUDOERS_DEBUG_LDAP)
result = calloc(1, sizeof(*result));
if (result != NULL)
STAILQ_INIT(&result->searches);
debug_return_ptr(result);
}
/*
* Free the ldap result structure
*/
static void
sudo_ldap_result_free(struct ldap_result *lres)
{
struct ldap_search_result *s;
debug_decl(sudo_ldap_result_free, SUDOERS_DEBUG_LDAP)
if (lres != NULL) {
if (lres->nentries) {
free(lres->entries);
lres->entries = NULL;
}
while ((s = STAILQ_FIRST(&lres->searches)) != NULL) {
STAILQ_REMOVE_HEAD(&lres->searches, entries);
ldap_msgfree(s->searchresult);
free(s);
}
free(lres);
}
debug_return;
}
/*
* Add a search result to the ldap_result structure.
*/
static struct ldap_search_result *
sudo_ldap_result_add_search(struct ldap_result *lres, LDAP *ldap,
LDAPMessage *searchresult)
{
struct ldap_search_result *news;
debug_decl(sudo_ldap_result_add_search, SUDOERS_DEBUG_LDAP)
/* Create new entry and add it to the end of the chain. */
news = calloc(1, sizeof(*news));
if (news != NULL) {
news->ldap = ldap;
news->searchresult = searchresult;
STAILQ_INSERT_TAIL(&lres->searches, news, entries);
}
debug_return_ptr(news);
}
/*
* Connect to the LDAP server specified by ld.
* Returns LDAP_SUCCESS on success, else non-zero.
*/
static int
sudo_ldap_bind_s(LDAP *ld)
{
int ret;
debug_decl(sudo_ldap_bind_s, SUDOERS_DEBUG_LDAP)
#ifdef HAVE_LDAP_SASL_INTERACTIVE_BIND_S
if (ldap_conf.rootuse_sasl == true ||
(ldap_conf.rootuse_sasl != false && ldap_conf.use_sasl == true)) {
const char *old_ccname = NULL;
const char *new_ccname = ldap_conf.krb5_ccname;
const char *tmp_ccname = NULL;
void *auth_id = ldap_conf.rootsasl_auth_id ?
ldap_conf.rootsasl_auth_id : ldap_conf.sasl_auth_id;
int rc;
/* Make temp copy of the user's credential cache as needed. */
if (ldap_conf.krb5_ccname == NULL && user_ccname != NULL) {
new_ccname = tmp_ccname = sudo_krb5_copy_cc_file(user_ccname);
if (tmp_ccname == NULL) {
/* XXX - fatal error */
sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
"unable to copy user ccache %s", user_ccname);
}
}
if (new_ccname != NULL) {
rc = sudo_set_krb5_ccache_name(new_ccname, &old_ccname);
if (rc == 0) {
sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
"set ccache name %s -> %s",
old_ccname ? old_ccname : "(none)", new_ccname);
} else {
sudo_debug_printf(SUDO_DEBUG_WARN|SUDO_DEBUG_LINENO,
"sudo_set_krb5_ccache_name() failed: %d", rc);
}
}
ret = ldap_sasl_interactive_bind_s(ld, ldap_conf.binddn,
ldap_conf.sasl_mech, NULL, NULL, LDAP_SASL_QUIET,
sudo_ldap_sasl_interact, auth_id);
if (new_ccname != NULL) {
rc = sudo_set_krb5_ccache_name(old_ccname ? old_ccname : "", NULL);
if (rc == 0) {
sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
"restore ccache name %s -> %s", new_ccname,
old_ccname ? old_ccname : "(none)");
} else {
sudo_debug_printf(SUDO_DEBUG_WARN|SUDO_DEBUG_LINENO,
"sudo_set_krb5_ccache_name() failed: %d", rc);
}
/* Remove temporary copy of user's credential cache. */
if (tmp_ccname != NULL)
unlink(tmp_ccname);
}
if (ret != LDAP_SUCCESS) {
sudo_warnx("ldap_sasl_interactive_bind_s(): %s",
ldap_err2string(ret));
goto done;
}
DPRINTF1("ldap_sasl_interactive_bind_s() ok");
} else
#endif /* HAVE_LDAP_SASL_INTERACTIVE_BIND_S */
#ifdef HAVE_LDAP_SASL_BIND_S
{
struct berval bv;
bv.bv_val = ldap_conf.bindpw ? ldap_conf.bindpw : "";
bv.bv_len = strlen(bv.bv_val);
ret = ldap_sasl_bind_s(ld, ldap_conf.binddn, LDAP_SASL_SIMPLE, &bv,
NULL, NULL, NULL);
if (ret != LDAP_SUCCESS) {
sudo_warnx("ldap_sasl_bind_s(): %s", ldap_err2string(ret));
goto done;
}
DPRINTF1("ldap_sasl_bind_s() ok");
}
#else
{
ret = ldap_simple_bind_s(ld, ldap_conf.binddn, ldap_conf.bindpw);
if (ret != LDAP_SUCCESS) {
sudo_warnx("ldap_simple_bind_s(): %s", ldap_err2string(ret));
goto done;
}
DPRINTF1("ldap_simple_bind_s() ok");
}
#endif
done:
debug_return_int(ret);
}
/*
* Open a connection to the LDAP server.
* Returns 0 on success and non-zero on failure.
*/
static int
sudo_ldap_open(struct sudo_nss *nss)
{
LDAP *ld;
int rc = -1;
bool ldapnoinit = false;
struct sudo_ldap_handle *handle;
debug_decl(sudo_ldap_open, SUDOERS_DEBUG_LDAP)
if (!sudo_ldap_read_config())
goto done;
/* Prevent reading of user ldaprc and system defaults. */
if (sudo_getenv("LDAPNOINIT") == NULL) {
if (sudo_setenv("LDAPNOINIT", "1", true) == 0)
ldapnoinit = true;
}
/* Set global LDAP options */
if (sudo_ldap_set_options_global() != LDAP_SUCCESS)
goto done;
/* Connect to LDAP server */
#ifdef HAVE_LDAP_INITIALIZE
if (!STAILQ_EMPTY(&ldap_conf.uri)) {
char *buf = sudo_ldap_join_uri(&ldap_conf.uri);
if (buf == NULL)
goto done;
DPRINTF2("ldap_initialize(ld, %s)", buf);
rc = ldap_initialize(&ld, buf);
free(buf);
} else
#endif
rc = sudo_ldap_init(&ld, ldap_conf.host, ldap_conf.port);
if (rc != LDAP_SUCCESS) {
sudo_warnx(U_("unable to initialize LDAP: %s"), ldap_err2string(rc));
goto done;
}
/* Set LDAP per-connection options */
rc = sudo_ldap_set_options_conn(ld);
if (rc != LDAP_SUCCESS)
goto done;
if (ldapnoinit)
(void) sudo_unsetenv("LDAPNOINIT");
if (ldap_conf.ssl_mode == SUDO_LDAP_STARTTLS) {
#if defined(HAVE_LDAP_START_TLS_S)
rc = ldap_start_tls_s(ld, NULL, NULL);
if (rc != LDAP_SUCCESS) {
sudo_warnx("ldap_start_tls_s(): %s", ldap_err2string(rc));
goto done;
}
DPRINTF1("ldap_start_tls_s() ok");
#elif defined(HAVE_LDAP_SSL_CLIENT_INIT) && defined(HAVE_LDAP_START_TLS_S_NP)
int sslrc;
rc = ldap_ssl_client_init(ldap_conf.tls_keyfile, ldap_conf.tls_keypw,
0, &sslrc);
if (rc != LDAP_SUCCESS) {
sudo_warnx("ldap_ssl_client_init(): %s (SSL reason code %d)",
ldap_err2string(rc), sslrc);
goto done;
}
rc = ldap_start_tls_s_np(ld, NULL);
if (rc != LDAP_SUCCESS) {
sudo_warnx("ldap_start_tls_s_np(): %s", ldap_err2string(rc));
goto done;
}
DPRINTF1("ldap_start_tls_s_np() ok");
#else
sudo_warnx(U_("start_tls specified but LDAP libs do not support ldap_start_tls_s() or ldap_start_tls_s_np()"));
#endif /* !HAVE_LDAP_START_TLS_S && !HAVE_LDAP_START_TLS_S_NP */
}
/* Actually connect */
rc = sudo_ldap_bind_s(ld);
if (rc != LDAP_SUCCESS)
goto done;
/* Create a handle container. */
handle = calloc(1, sizeof(struct sudo_ldap_handle));
if (handle == NULL) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
rc = -1;
goto done;
}
handle->ld = ld;
/* handle->result = NULL; */
/* handle->username = NULL; */
/* handle->gidlist = NULL; */
nss->handle = handle;
done:
debug_return_int(rc == LDAP_SUCCESS ? 0 : -1);
}
static int
sudo_ldap_setdefs(struct sudo_nss *nss)
{
struct ldap_config_str *base;
struct sudo_ldap_handle *handle = nss->handle;
struct timeval tv, *tvp = NULL;
LDAP *ld;
LDAPMessage *entry, *result = NULL;
char *filt;
int ret;
debug_decl(sudo_ldap_setdefs, SUDOERS_DEBUG_LDAP)
if (handle == NULL || handle->ld == NULL)
debug_return_int(-1);
ld = handle->ld;
filt = sudo_ldap_build_default_filter();
if (filt == NULL) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
debug_return_int(-1);
}
DPRINTF1("Looking for cn=defaults: %s", filt);
STAILQ_FOREACH(base, &ldap_conf.base, entries) {
if (ldap_conf.timeout > 0) {
tv.tv_sec = ldap_conf.timeout;
tv.tv_usec = 0;
tvp = &tv;
}
ldap_msgfree(result);
result = NULL;
ret = ldap_search_ext_s(ld, base->val, LDAP_SCOPE_SUBTREE,
filt, NULL, 0, NULL, NULL, tvp, 0, &result);
if (ret == LDAP_SUCCESS && (entry = ldap_first_entry(ld, result))) {
DPRINTF1("found:%s", ldap_get_dn(ld, entry));
if (!sudo_ldap_parse_options(ld, entry)) {
ret = -1;
goto done;
}
} else {
DPRINTF1("no default options found in %s", base->val);
}
}
ret = 0;
done:
ldap_msgfree(result);
free(filt);
debug_return_int(ret);
}
/*
* like sudoers_lookup() - only LDAP style
*/
static int
sudo_ldap_lookup(struct sudo_nss *nss, int ret, int pwflag)
{
struct sudo_ldap_handle *handle = nss->handle;
LDAP *ld;
LDAPMessage *entry;
int rc, setenv_implied;
unsigned int i;
struct ldap_result *lres = NULL;
debug_decl(sudo_ldap_lookup, SUDOERS_DEBUG_LDAP)
if (handle == NULL || handle->ld == NULL)
debug_return_int(ret);
ld = handle->ld;
/* Fetch list of sudoRole entries that match user and host. */
lres = sudo_ldap_result_get(nss, sudo_user.pw);
if (lres == NULL)
debug_return_int(ret);
/*
* The following queries only determine whether or not a password
* is required, so the order of the entries doesn't matter.
*/
if (pwflag) {
int doauth = UNSPEC;
int matched = UNSPEC;
enum def_tuple pwcheck =
(pwflag == -1) ? never : sudo_defs_table[pwflag].sd_un.tuple;
DPRINTF1("perform search for pwflag %d", pwflag);
for (i = 0; i < lres->nentries; i++) {
entry = lres->entries[i].entry;
if ((pwcheck == any && doauth != false) ||
(pwcheck == all && doauth != true)) {
doauth = !!sudo_ldap_check_bool(ld, entry, "authenticate");
}
if (matched == true)
continue;
/* Only check the command when listing another user. */
if (user_uid == 0 || list_pw == NULL ||
user_uid == list_pw->pw_uid ||
sudo_ldap_check_command(ld, entry, NULL) == true) {
matched = true;
}
}
if (matched == true || user_uid == 0) {
SET(ret, VALIDATE_SUCCESS);
CLR(ret, VALIDATE_FAILURE);
switch (pwcheck) {
case always:
SET(ret, FLAG_CHECK_USER);
break;
case all:
case any:
if (doauth == false)
SET(ret, FLAG_NOPASSWD);
else
CLR(ret, FLAG_NOPASSWD);
break;
default:
break;
}
}
goto done;
}
DPRINTF1("searching LDAP for sudoers entries");
setenv_implied = false;
for (i = 0; i < lres->nentries; i++) {
entry = lres->entries[i].entry;
if (!sudo_ldap_check_runas(ld, entry))
continue;
rc = sudo_ldap_check_command(ld, entry, &setenv_implied);
if (rc != UNSPEC) {
/* We have a match. */
DPRINTF1("Command %sallowed", rc == true ? "" : "NOT ");
if (rc == true) {
DPRINTF1("LDAP entry: %p", entry);
/* Apply entry-specific options. */
if (setenv_implied)
def_setenv = true;
if (sudo_ldap_parse_options(ld, entry)) {
#ifdef HAVE_SELINUX
/* Set role and type if not specified on command line. */
if (user_role == NULL)
user_role = def_role;
if (user_type == NULL)
user_type = def_type;
#endif /* HAVE_SELINUX */
SET(ret, VALIDATE_SUCCESS);
CLR(ret, VALIDATE_FAILURE);
} else {
SET(ret, VALIDATE_ERROR);
}
} else {
SET(ret, VALIDATE_FAILURE);
CLR(ret, VALIDATE_SUCCESS);
}
break;
}
}
done:
DPRINTF1("done with LDAP searches");
DPRINTF1("user_matches=%s", lres->user_matches ? "true" : "false");
DPRINTF1("host_matches=%s", lres->host_matches ? "true" : "false");
if (!ISSET(ret, VALIDATE_SUCCESS)) {
/* No matching entries. */
if (pwflag && list_pw == NULL)
SET(ret, FLAG_NO_CHECK);
}
if (pwflag || lres->user_matches)
CLR(ret, FLAG_NO_USER);
if (pwflag || lres->host_matches)
CLR(ret, FLAG_NO_HOST);
DPRINTF1("sudo_ldap_lookup(%d)=0x%02x", pwflag, ret);
debug_return_int(ret);
}
/*
* Comparison function for ldap_entry_wrapper structures, descending order.
*/
static int
ldap_entry_compare(const void *a, const void *b)
{
const struct ldap_entry_wrapper *aw = a;
const struct ldap_entry_wrapper *bw = b;
debug_decl(ldap_entry_compare, SUDOERS_DEBUG_LDAP)
debug_return_int(bw->order < aw->order ? -1 :
(bw->order > aw->order ? 1 : 0));
}
/*
* Return the last entry in the list of searches, usually the
* one currently being used to add entries.
*/
static struct ldap_search_result *
sudo_ldap_result_last_search(struct ldap_result *lres)
{
debug_decl(sudo_ldap_result_last_search, SUDOERS_DEBUG_LDAP)
debug_return_ptr(STAILQ_LAST(&lres->searches, ldap_search_result, entries));
}
/*
* Add an entry to the result structure.
*/
static struct ldap_entry_wrapper *
sudo_ldap_result_add_entry(struct ldap_result *lres, LDAPMessage *entry)
{
struct ldap_search_result *last;
struct berval **bv;
double order = 0.0;
char *ep;
debug_decl(sudo_ldap_result_add_entry, SUDOERS_DEBUG_LDAP)
/* Determine whether the entry has the sudoOrder attribute. */
last = sudo_ldap_result_last_search(lres);
if (last != NULL) {
bv = ldap_get_values_len(last->ldap, entry, "sudoOrder");
if (bv != NULL) {
if (ldap_count_values_len(bv) > 0) {
/* Get the value of this attribute, 0 if not present. */
DPRINTF2("order attribute raw: %s", (*bv)->bv_val);
order = strtod((*bv)->bv_val, &ep);
if (ep == (*bv)->bv_val || *ep != '\0') {
sudo_warnx(U_("invalid sudoOrder attribute: %s"),
(*bv)->bv_val);
order = 0.0;
}
DPRINTF2("order attribute: %f", order);
}
ldap_value_free_len(bv);
}
}
/*
* Enlarge the array of entry wrappers as needed, preallocating blocks
* of 100 entries to save on allocation time.
*/
if (++lres->nentries > lres->allocated_entries) {
int allocated_entries = lres->allocated_entries + ALLOCATION_INCREMENT;
struct ldap_entry_wrapper *entries = reallocarray(lres->entries,
allocated_entries, sizeof(lres->entries[0]));
if (entries == NULL)
debug_return_ptr(NULL);
lres->allocated_entries = allocated_entries;
lres->entries = entries;
}
/* Fill in the new entry and return it. */
lres->entries[lres->nentries - 1].entry = entry;
lres->entries[lres->nentries - 1].order = order;
debug_return_ptr(&lres->entries[lres->nentries - 1]);
}
/*
* Free the ldap result structure in the sudo_nss handle.
*/
static void
sudo_ldap_result_free_nss(struct sudo_nss *nss)
{
struct sudo_ldap_handle *handle = nss->handle;
debug_decl(sudo_ldap_result_free_nss, SUDOERS_DEBUG_LDAP)
if (handle->result != NULL) {
DPRINTF1("removing reusable search result");
sudo_ldap_result_free(handle->result);
handle->username = NULL;
handle->gidlist = NULL;
handle->result = NULL;
}
debug_return;
}
/*
* Perform the LDAP query for the user or return a cached query if
* there is one for this user.
*/
static struct ldap_result *
sudo_ldap_result_get(struct sudo_nss *nss, struct passwd *pw)
{
struct sudo_ldap_handle *handle = nss->handle;
struct ldap_config_str *base;
struct ldap_result *lres;
struct timeval tv, *tvp = NULL;
LDAPMessage *entry, *result;
LDAP *ld = handle->ld;
int pass, rc;
char *filt;
debug_decl(sudo_ldap_result_get, SUDOERS_DEBUG_LDAP)
/*
* If we already have a cached result, return it so we don't have to
* have to contact the LDAP server again.
*/
if (handle->result) {
if (handle->gidlist == user_gid_list &&
strcmp(pw->pw_name, handle->username) == 0) {
DPRINTF1("reusing previous result (user %s) with %d entries",
handle->username, handle->result->nentries);
debug_return_ptr(handle->result);
}
/* User mismatch, cached result cannot be used. */
DPRINTF1("removing result (user %s), new search (user %s)",
handle->username, pw->pw_name);
sudo_ldap_result_free_nss(nss);
}
/*
* Okay - time to search for anything that matches this user
* Lets limit it to only two queries of the LDAP server
*
* The first pass will look by the username, groups, and
* the keyword ALL. We will then inspect the results that
* came back from the query. We don't need to inspect the
* sudoUser in this pass since the LDAP server already scanned
* it for us.
*
* The second pass will return all the entries that contain non-
* Unix groups, including netgroups. Then we take the non-Unix
* groups returned and try to match them against the username.
*
* Since we have to sort the possible entries before we make a
* decision, we perform the queries and store all of the results in
* an ldap_result object. The results are then sorted by sudoOrder.
*/
lres = sudo_ldap_result_alloc();
if (lres == NULL) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
debug_return_ptr(NULL);
}
for (pass = 0; pass < 2; pass++) {
filt = pass ? sudo_ldap_build_pass2() : sudo_ldap_build_pass1(ld, pw);
if (filt != NULL) {
DPRINTF1("ldap search '%s'", filt);
STAILQ_FOREACH(base, &ldap_conf.base, entries) {
DPRINTF1("searching from base '%s'",
base->val);
if (ldap_conf.timeout > 0) {
tv.tv_sec = ldap_conf.timeout;
tv.tv_usec = 0;
tvp = &tv;
}
result = NULL;
rc = ldap_search_ext_s(ld, base->val, LDAP_SCOPE_SUBTREE, filt,
NULL, 0, NULL, NULL, tvp, 0, &result);
if (rc != LDAP_SUCCESS) {
DPRINTF1("ldap search pass %d failed: %s", pass + 1,
ldap_err2string(rc));
continue;
}
/* Add the search result to list of search results. */
DPRINTF1("adding search result");
if (sudo_ldap_result_add_search(lres, ld, result) == NULL) {
sudo_warnx(U_("%s: %s"), __func__,
U_("unable to allocate memory"));
free(filt);
sudo_ldap_result_free(lres);
debug_return_ptr(NULL);
}
LDAP_FOREACH(entry, ld, result) {
/* Check user or non-unix group. */
if (pass && !sudo_ldap_check_non_unix_group(ld, entry, pw))
continue;
lres->user_matches = true;
/* Check host. */
if (!sudo_ldap_check_host(ld, entry, pw))
continue;
lres->host_matches = true;
if (sudo_ldap_result_add_entry(lres, entry) == NULL) {
sudo_warnx(U_("%s: %s"), __func__,
U_("unable to allocate memory"));
free(filt);
sudo_ldap_result_free(lres);
debug_return_ptr(NULL);
}
}
DPRINTF1("result now has %d entries", lres->nentries);
}
free(filt);
} else if (errno != ENOENT) {
/* Out of memory? */
sudo_ldap_result_free(lres);
debug_return_ptr(NULL);
}
}
/* Sort the entries by the sudoOrder attribute. */
if (lres->nentries != 0) {
DPRINTF1("sorting remaining %d entries", lres->nentries);
qsort(lres->entries, lres->nentries, sizeof(lres->entries[0]),
ldap_entry_compare);
}
/* Store everything in the sudo_nss handle. */
/* XXX - store pw and take a reference to it. */
/* XXX - take refs for gidlist and grlist */
handle->result = lres;
handle->username = pw->pw_name;
handle->gidlist = user_gid_list;
debug_return_ptr(lres);
}
/*
* Shut down the LDAP connection.
*/
static int
sudo_ldap_close(struct sudo_nss *nss)
{
struct sudo_ldap_handle *handle = nss->handle;
debug_decl(sudo_ldap_close, SUDOERS_DEBUG_LDAP)
if (handle != NULL) {
/* Free the result before unbinding; it may use the LDAP connection. */
sudo_ldap_result_free_nss(nss);
/* Unbind and close the LDAP connection. */
if (handle->ld != NULL) {
ldap_unbind_ext_s(handle->ld, NULL, NULL);
handle->ld = NULL;
}
/* Free the handle container. */
free(nss->handle);
nss->handle = NULL;
}
debug_return_int(0);
}
/*
* STUB
*/
static int
sudo_ldap_parse(struct sudo_nss *nss)
{
return 0;
}
#if 0
/*
* Create an ldap_result from an LDAP search result.
*
* This function is currently not used anywhere, it is left here as
* an example of how to use the cached searches.
*/
static struct ldap_result *
sudo_ldap_result_from_search(LDAP *ldap, LDAPMessage *searchresult)
{
struct ldap_search_result *last;
struct ldap_result *result;
LDAPMessage *entry;
/*
* An ldap_result is built from several search results, which are
* organized in a list. The head of the list is maintained in the
* ldap_result structure, together with the wrappers that point
* to individual entries, this has to be initialized first.
*/
result = sudo_ldap_result_alloc();
if (result == NULL) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
debug_return_ptr(NULL);
}
/*
* Build a new list node for the search result, this creates the
* list node.
*/
last = sudo_ldap_result_add_search(result, ldap, searchresult);
/*
* Now add each entry in the search result to the array of of entries
* in the ldap_result object.
*/
LDAP_FOREACH(entry, last->ldap, last->searchresult) {
if (sudo_ldap_result_add_entry(result, entry) == NULL) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
sudo_ldap_result_free(result);
result = NULL;
break;
}
}
DPRINTF1("sudo_ldap_result_from_search: %d entries found",
result ? result->nentries : -1);
return result;
}
#endif
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