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3f84e1b18d70f917aed01d6f9c6bad11e282b368
sudo/ldap.c
Todd C. Miller 3f84e1b18d use DPRINTF macro
2005-04-11 03:49:46 +00:00

969 lines
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/*
* Copyright (c) 2003-2005 Todd C. Miller <Todd.Miller@courtesan.com>
*
* 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/param.h>
#include <sys/stat.h>
#include <stdio.h>
#ifdef STDC_HEADERS
# include <stdlib.h>
# include <stddef.h>
#else
# ifdef HAVE_STDLIB_H
# include <stdlib.h>
# endif
#endif /* STDC_HEADERS */
#ifdef HAVE_STRING_H
# include <string.h>
#else
# ifdef HAVE_STRINGS_H
# include <strings.h>
# endif
#endif /* HAVE_STRING_H */
#if defined(HAVE_MALLOC_H) && !defined(STDC_HEADERS)
# include <malloc.h>
#endif /* HAVE_MALLOC_H && !STDC_HEADERS */
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#include <ctype.h>
#include <pwd.h>
#include <grp.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <err.h>
#include <errno.h>
#ifdef HAVE_LBER_H
# include <lber.h>
#endif
#include <ldap.h>
#include "sudo.h"
#include "parse.h"
#ifndef lint
__unused static const char rcsid[] = "$Sudo$";
#endif /* lint */
#ifndef BUF_SIZ
# define BUF_SIZ 1024
#endif
#ifndef LDAP_OPT_SUCCESS
# define LDAP_OPT_SUCCESS LDAP_SUCCESS
#endif
#define DPRINTF(args, level) if (ldap_conf.debug >= level) warnx args
/* ldap configuration structure */
struct ldap_config {
char *host;
int port;
int version;
char *uri;
char *binddn;
char *bindpw;
char *base;
char *ssl;
int tls_checkpeer;
char *tls_cacertfile;
char *tls_cacertdir;
char *tls_random_file;
char *tls_cipher_suite;
char *tls_certfile;
char *tls_keyfile;
int debug;
} ldap_conf;
/*
* Walk through search results and return TRUE if we have a matching
* netgroup, else FALSE.
*/
int
sudo_ldap_check_user_netgroup(ld, entry)
LDAP *ld;
LDAPMessage *entry;
{
char **v = NULL, **p = NULL;
int ret = FALSE;
if (!entry)
return(ret);
/* get the values from the entry */
v = ldap_get_values(ld, entry, "sudoUser");
/* walk through values */
for (p = v; p && *p && !ret; p++) {
/* match any */
if (netgr_matches(*p, NULL, NULL, user_name))
ret = TRUE;
DPRINTF(("ldap sudoUser netgroup '%s' ... %s", *p,
ret ? "MATCH!" : "not"), 2);
}
if (v)
ldap_value_free(v); /* cleanup */
return(ret);
}
/*
* Walk through search results and return TRUE if we have a
* host match, else FALSE.
*/
int
sudo_ldap_check_host(ld, entry)
LDAP *ld;
LDAPMessage *entry;
{
char **v = NULL, **p = NULL;
int ret = FALSE;
if (!entry)
return(ret);
/* get the values from the entry */
v = ldap_get_values(ld, entry, "sudoHost");
/* walk through values */
for (p = v; p && *p && !ret; p++) {
/* match any or address or netgroup or hostname */
if (!strcasecmp(*p, "ALL") || addr_matches(*p) ||
netgr_matches(*p, user_host, user_shost, NULL) ||
!hostname_matches(user_shost, user_host, *p))
ret = TRUE;
DPRINTF(("ldap sudoHost '%s' ... %s", *p,
ret ? "MATCH!" : "not"), 2);
}
if (v)
ldap_value_free(v); /* cleanup */
return(ret);
}
/*
* Walk through search results and return TRUE if we have a runas match,
* else FALSE.
* Since the runas directive in /etc/sudoers is optional, so is sudoRunAs.
*/
int
sudo_ldap_check_runas(ld, entry)
LDAP *ld;
LDAPMessage *entry;
{
char **v = NULL, **p = NULL;
int ret = FALSE;
if (!entry)
return(ret);
/* get the values from the entry */
v = ldap_get_values(ld, entry, "sudoRunAs");
/*
* 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
* 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
*
*/
/*
* If there are no runas entries, then match the runas_default with whats
* on the command line
*/
if (!v)
ret = !strcasecmp(*user_runas, def_runas_default);
/*
* What about the case where exactly one runas is specified in the config
* and the user forgets the -u option, should we switch it?
* Probably not...
*/
/* walk through values returned, looking for a match */
for (p = v; p && *p && !ret; p++) {
if (!strcasecmp(*p, *user_runas) || !strcasecmp(*p, "ALL"))
ret = TRUE;
DPRINTF(("ldap sudoRunAs '%s' ... %s", *p,
ret ? "MATCH!" : "not"), 2);
}
if (v)
ldap_value_free(v); /* cleanup */
return(ret);
}
/*
* Walk through search results and return TRUE if we have a command match.
*/
int
sudo_ldap_check_command(ld, entry)
LDAP *ld;
LDAPMessage *entry;
{
char *allowed_cmnd, *allowed_args, **v = NULL, **p = NULL;
int foundbang, ret = FALSE;
if (!entry)
return(ret);
v = ldap_get_values(ld, entry, "sudoCommand");
/* get_first_entry */
for (p = v; p && *p && ret >= 0; p++) {
/* Match against ALL ? */
if (!strcasecmp(*p, "ALL")) {
ret = TRUE;
efree(safe_cmnd);
safe_cmnd = estrdup(user_cmnd);
DPRINTF(("ldap sudoCommand '%s' ... MATCH!", *p), 2);
continue;
}
/* check for !command */
if (**p == '!') {
foundbang = TRUE;
allowed_cmnd = estrdup(1 + *p); /* !command */
} else {
foundbang = FALSE;
allowed_cmnd = estrdup(*p); /* command */
}
/* 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)) {
/*
* If allowed (no bang) set ret but keep on checking.
* If disallowed (bang), exit loop.
*/
ret = foundbang ? -1 : TRUE;
}
DPRINTF(("ldap sudoCommand '%s' ... %s", *p,
ret == TRUE ? "MATCH!" : "not"), 2);
efree(allowed_cmnd); /* cleanup */
}
if (v)
ldap_value_free(v); /* more cleanup */
/* return TRUE if we found at least one ALLOW and no DENY */
return(ret > 0);
}
/*
* 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.
*/
void
sudo_ldap_parse_options(ld, entry)
LDAP *ld;
LDAPMessage *entry;
{
char op, *var, *val, **v = NULL, **p = NULL;
if (!entry)
return;
v = ldap_get_values(ld, entry, "sudoOption");
/* walk through options */
for (p = v; p && *p; p++) {
DPRINTF(("ldap sudoOption: '%s'", *p), 2);
var = estrdup(*p);
/* check for equals sign past first char */
val = strchr(var, '=');
if (val > var) {
*val++ = '\0'; /* split on = and truncate var */
op = *(val - 2); /* peek for += or -= cases */
if (op == '+' || op == '-') {
*(val - 2) = '\0'; /* found, remove extra char */
/* case var+=val or var-=val */
set_default(var, val, (int) op);
} else {
/* case var=val */
set_default(var, val, TRUE);
}
} else if (*var == '!') {
/* case !var Boolean False */
set_default(var + 1, NULL, FALSE);
} else {
/* case var Boolean True */
set_default(var, NULL, TRUE);
}
efree(var);
}
if (v)
ldap_value_free(v);
}
/*
* Concatenate strings, dynamically growing them as necessary.
* Strings can be arbitrarily long and are allocated/reallocated on
* the fly. Make sure to free them when you are done.
*
* Usage:
*
* char *s=NULL;
* size_t sz;
*
* ncat(&s,&sz,"This ");
* ncat(&s,&sz,"is ");
* ncat(&s,&sz,"an ");
* ncat(&s,&sz,"arbitrarily ");
* ncat(&s,&sz,"long ");
* ncat(&s,&sz,"string!");
*
* printf("String Value='%s', but has %d bytes allocated\n",s,sz);
*
*/
void
ncat(s, sz, src)
char **s;
size_t *sz;
char *src;
{
size_t nsz;
/* handle initial alloc */
if (*s == NULL) {
*s = estrdup(src);
*sz = strlen(src) + 1;
return;
}
/* handle realloc */
nsz = strlen(*s) + strlen(src) + 1;
if (*sz < nsz)
*s = erealloc((void *) *s, *sz = nsz * 2);
strlcat(*s, src, *sz);
}
/*
* builds together a filter to check against ldap
*/
char *
sudo_ldap_build_pass1()
{
struct group *grp;
size_t sz;
char *b = NULL;
int i;
/* global OR */
ncat(&b, &sz, "(|");
/* build filter sudoUser=user_name */
ncat(&b, &sz, "(sudoUser=");
ncat(&b, &sz, user_name);
ncat(&b, &sz, ")");
/* Append primary group */
grp = sudo_getgrgid(getgid());
if (grp != NULL) {
ncat(&b, &sz, "(sudoUser=%");
ncat(&b, &sz, grp -> gr_name);
ncat(&b, &sz, ")");
}
/* Append supplementary groups */
for (i = 0; i < user_ngroups; i++) {
if ((grp = sudo_getgrgid(user_groups[i])) != NULL) {
ncat(&b, &sz, "(sudoUser=%");
ncat(&b, &sz, grp -> gr_name);
ncat(&b, &sz, ")");
}
}
/* Add ALL to list */
ncat(&b, &sz, "(sudoUser=ALL)");
/* End of OR List */
ncat(&b, &sz, ")");
return(b);
}
/*
* Map yes/true/on to TRUE, no/false/off to FALSE, else -1
*/
int
_atobool(s)
const char *s;
{
switch (*s) {
case 'y':
case 'Y':
if (strcasecmp(s, "yes") == 0)
return(TRUE);
break;
case 't':
case 'T':
if (strcasecmp(s, "true") == 0)
return(TRUE);
break;
case 'o':
case 'O':
if (strcasecmp(s, "on") == 0)
return(TRUE);
if (strcasecmp(s, "off") == 0)
return(FALSE);
break;
case 'n':
case 'N':
if (strcasecmp(s, "no") == 0)
return(FALSE);
break;
case 'f':
case 'F':
if (strcasecmp(s, "false") == 0)
return(FALSE);
break;
}
return(-1);
}
int
sudo_ldap_read_config()
{
FILE *f;
char buf[BUF_SIZ], *c, *keyword, *value;
ldap_conf.tls_checkpeer = -1; /* default */
if ((f = fopen(_PATH_LDAP_CONF, "r")) == NULL)
return(FALSE);
while (fgets(buf, sizeof(buf), f)) {
c = buf;
if (*c == '#')
continue; /* ignore comment */
if (*c == '\n')
continue; /* skip newline */
if (!*c)
continue; /* incomplete last line */
/* skip whitespace before keyword */
while (isspace((unsigned char) *c))
c++;
keyword = c;
/* properly terminate keyword string */
while (*c && !isspace((unsigned char) *c))
c++;
if (*c)
*c++ = '\0'; /* terminate keyword */
/* skip whitespace before value */
while (isspace((unsigned char) *c))
c++;
value = c;
/* trim whitespace after value */
while (*c)
c++; /* wind to end */
while (--c > value && isspace((unsigned char) *c))
*c = '\0';
/* The following macros make the code much more readable */
#define MATCH_S(x,y) if (!strcasecmp(keyword,x)) \
{ efree(y); y=estrdup(value); }
#define MATCH_I(x,y) if (!strcasecmp(keyword,x)) { y=atoi(value); }
#define MATCH_B(x,y) if (!strcasecmp(keyword,x)) { y=_atobool(value); }
/*
* Parse values using a continues chain of if else if else if else if
* else ...
*/
MATCH_S("host", ldap_conf.host)
else
MATCH_I("port", ldap_conf.port)
else
MATCH_S("ssl", ldap_conf.ssl)
else
MATCH_B("tls_checkpeer", ldap_conf.tls_checkpeer)
else
MATCH_S("tls_cacertfile", ldap_conf.tls_cacertfile)
else
MATCH_S("tls_cacertdir", ldap_conf.tls_cacertdir)
else
MATCH_S("tls_randfile", ldap_conf.tls_random_file)
else
MATCH_S("tls_ciphers", ldap_conf.tls_cipher_suite)
else
MATCH_S("tls_cert", ldap_conf.tls_certfile)
else
MATCH_S("tls_key", ldap_conf.tls_keyfile)
else
MATCH_I("ldap_version", ldap_conf.version)
else
MATCH_S("uri", ldap_conf.uri)
else
MATCH_S("binddn", ldap_conf.binddn)
else
MATCH_S("bindpw", ldap_conf.bindpw)
else
MATCH_S("sudoers_base", ldap_conf.base)
else
MATCH_I("sudoers_debug", ldap_conf.debug)
else {
/*
* The keyword was unrecognized. Since this config file is
* shared by multiple programs, it is appropriate to silently
* ignore options this program does not understand
*/
}
}
fclose(f);
/* defaults */
if (!ldap_conf.version)
ldap_conf.version = 3;
if (!ldap_conf.port)
ldap_conf.port = 389;
if (!ldap_conf.host)
ldap_conf.host = estrdup("localhost");
if (ldap_conf.debug > 1) {
fprintf(stderr, "LDAP Config Summary\n");
fprintf(stderr, "===================\n");
#ifdef HAVE_LDAP_INITIALIZE
if (ldap_conf.uri) {
fprintf(stderr, "uri %s\n", ldap_conf.uri);
} else
#endif
{
fprintf(stderr, "host %s\n", ldap_conf.host ?
ldap_conf.host : "(NONE)");
fprintf(stderr, "port %d\n", ldap_conf.port);
}
fprintf(stderr, "ldap_version %d\n", ldap_conf.version);
fprintf(stderr, "sudoers_base %s\n", ldap_conf.base ?
ldap_conf.base : "(NONE) <---Sudo will ignore ldap)");
fprintf(stderr, "binddn %s\n", ldap_conf.binddn ?
ldap_conf.binddn : "(anonymous)");
fprintf(stderr, "bindpw %s\n", ldap_conf.bindpw ?
ldap_conf.bindpw : "(anonymous)");
#ifdef HAVE_LDAP_START_TLS_S
fprintf(stderr, "ssl %s\n", ldap_conf.ssl ?
ldap_conf.ssl : "(no)");
#endif
fprintf(stderr, "===================\n");
}
if (!ldap_conf.base)
return(FALSE); /* if no base is defined, ignore LDAP */
return(TRUE);
}
/*
* like perl's join(sep,@ARGS)
*/
char *
_ldap_join_values(sep, v)
char *sep;
char **v;
{
char *b = NULL, **p = NULL;
size_t sz = 0;
/* paste values together */
for (p = v; p && *p; p++) {
if (p != v && sep != NULL)
ncat(&b, &sz, sep); /* append seperator */
ncat(&b, &sz, *p); /* append value */
}
/* sanity check */
if (b[0] == '\0') {
/* something went wrong, put something here */
ncat(&b, &sz, "(empty list)"); /* append value */
}
return(b);
}
char *sudo_ldap_cm_list = NULL;
size_t sudo_ldap_cm_list_size;
#define SAVE_LIST(x) ncat(&sudo_ldap_cm_list,&sudo_ldap_cm_list_size,(x))
/*
* Walks through search result and returns TRUE if we have a
* command match
*/
int
sudo_ldap_add_match(ld, entry, pwflag)
LDAP *ld;
LDAPMessage *entry;
int pwflag;
{
char *dn, **edn, **v = NULL;
/* if we are not collecting matches, then don't save them */
if (pwflag != I_LISTPW)
return(TRUE);
/* collect the dn, only show the rdn */
dn = ldap_get_dn(ld, entry);
edn = dn ? ldap_explode_dn(dn, 1) : NULL;
SAVE_LIST("\nLDAP Role: ");
SAVE_LIST((edn && *edn) ? *edn : "UNKNOWN");
SAVE_LIST("\n");
if (dn)
ldap_memfree(dn);
if (edn)
ldap_value_free(edn);
/* get the Runas Values from the entry */
v = ldap_get_values(ld, entry, "sudoRunAs");
if (v && *v) {
SAVE_LIST(" RunAs: (");
SAVE_LIST(_ldap_join_values(", ", v));
SAVE_LIST(")\n");
}
if (v)
ldap_value_free(v);
/* get the Command Values from the entry */
v = ldap_get_values(ld, entry, "sudoCommand");
if (v && *v) {
SAVE_LIST(" Commands:\n ");
SAVE_LIST(_ldap_join_values("\n ", v));
SAVE_LIST("\n");
} else {
SAVE_LIST(" Commands: NONE\n");
}
if (v)
ldap_value_free(v);
return(FALSE); /* Don't stop at the first match */
}
#undef SAVE_LIST
void
sudo_ldap_display_privs()
{
if (sudo_ldap_cm_list != NULL)
printf("%s", sudo_ldap_cm_list);
}
/*
* Open a connection to the LDAP server.
*/
VOID *
sudo_ldap_open()
{
LDAP *ld = NULL;
int rc; /* temp return value */
if (!sudo_ldap_read_config())
return(NULL);
/* macro to set option, error on failure plus consistent debugging */
#define SET_OPT(opt,optname,val) \
if (ldap_conf.val!=NULL) { \
if (ldap_conf.debug>1) fprintf(stderr, \
"ldap_set_option(LDAP_OPT_%s,\"%s\")\n",optname,ldap_conf.val); \
rc=ldap_set_option(ld,opt,ldap_conf.val); \
if(rc != LDAP_OPT_SUCCESS){ \
fprintf(stderr,"ldap_set_option(LDAP_OPT_%s,\"%s\")=%d: %s\n", \
optname, ldap_conf.val, rc, ldap_err2string(rc)); \
return(NULL) ; \
} \
} \
/* like above, but assumes val is in int */
#define SET_OPTI(opt,optname,val) \
if (ldap_conf.debug>1) fprintf(stderr, \
"ldap_set_option(LDAP_OPT_%s,0x%02x)\n",optname,ldap_conf.val); \
rc=ldap_set_option(ld,opt,&ldap_conf.val); \
if(rc != LDAP_OPT_SUCCESS){ \
fprintf(stderr,"ldap_set_option(LDAP_OPT_%s,0x%02x)=%d: %s\n", \
optname, ldap_conf.val, rc, ldap_err2string(rc)); \
return(NULL) ; \
} \
/* attempt to setup ssl options */
#ifdef LDAP_OPT_X_TLS_CACERTFILE
SET_OPT(LDAP_OPT_X_TLS_CACERTFILE, "X_TLS_CACERTFILE", tls_cacertfile);
#endif /* LDAP_OPT_X_TLS_CACERTFILE */
#ifdef LDAP_OPT_X_TLS_CACERTDIR
SET_OPT(LDAP_OPT_X_TLS_CACERTDIR, "X_TLS_CACERTDIR", tls_cacertdir);
#endif /* LDAP_OPT_X_TLS_CACERTDIR */
#ifdef LDAP_OPT_X_TLS_CERTFILE
SET_OPT(LDAP_OPT_X_TLS_CERTFILE, "X_TLS_CERTFILE", tls_certfile);
#endif /* LDAP_OPT_X_TLS_CERTFILE */
#ifdef LDAP_OPT_X_TLS_KEYFILE
SET_OPT(LDAP_OPT_X_TLS_KEYFILE, "X_TLS_KEYFILE", tls_keyfile);
#endif /* LDAP_OPT_X_TLS_KEYFILE */
#ifdef LDAP_OPT_X_TLS_CIPHER_SUITE
SET_OPT(LDAP_OPT_X_TLS_CIPHER_SUITE, "X_TLS_CIPHER_SUITE", tls_cipher_suite);
#endif /* LDAP_OPT_X_TLS_CIPHER_SUITE */
#ifdef LDAP_OPT_X_TLS_RANDOM_FILE
SET_OPT(LDAP_OPT_X_TLS_RANDOM_FILE, "X_TLS_RANDOM_FILE", tls_random_file);
#endif /* LDAP_OPT_X_TLS_RANDOM_FILE */
#ifdef LDAP_OPT_X_TLS_REQUIRE_CERT
/* check the server certificate? */
if (ldap_conf.tls_checkpeer != -1) {
SET_OPTI(LDAP_OPT_X_TLS_REQUIRE_CERT, "X_TLS_REQUIRE_CERT",
tls_checkpeer);
}
#endif /* LDAP_OPT_X_TLS_REQUIRE_CERT */
/* attempt connect */
#ifdef HAVE_LDAP_INITIALIZE
if (ldap_conf.uri) {
DPRINTF(("ldap_initialize(ld,%s)", ldap_conf.uri), 2);
rc = ldap_initialize(&ld, ldap_conf.uri);
if (rc) {
fprintf(stderr, "ldap_initialize()=%d : %s\n",
rc, ldap_err2string(rc));
return(NULL);
}
} else
#endif /* HAVE_LDAP_INITIALIZE */
if (ldap_conf.host) {
DPRINTF(("ldap_init(%s,%d)", ldap_conf.host, ldap_conf.port), 2);
if ((ld = ldap_init(ldap_conf.host, ldap_conf.port)) == NULL) {
fprintf(stderr, "ldap_init(): errno=%d : %s\n",
errno, strerror(errno));
return(NULL);
}
}
#ifdef LDAP_OPT_PROTOCOL_VERSION
/* Set the LDAP Protocol version */
SET_OPTI(LDAP_OPT_PROTOCOL_VERSION, "PROTOCOL_VERSION", version);
#endif /* LDAP_OPT_PROTOCOL_VERSION */
#ifdef HAVE_LDAP_START_TLS_S
/* Turn on TLS */
if (ldap_conf.ssl && !strcasecmp(ldap_conf.ssl, "start_tls")) {
rc = ldap_start_tls_s(ld, NULL, NULL);
if (rc != LDAP_SUCCESS) {
fprintf(stderr, "ldap_start_tls_s(): %d: %s\n", rc,
ldap_err2string(rc));
ldap_unbind(ld);
return(NULL);
}
DPRINTF(("ldap_start_tls_s() ok"), 1);
}
#endif /* HAVE_LDAP_START_TLS_S */
/* Actually connect */
if ((rc = ldap_simple_bind_s(ld, ldap_conf.binddn, ldap_conf.bindpw))) {
fprintf(stderr, "ldap_simple_bind_s()=%d : %s\n",
rc, ldap_err2string(rc));
return(NULL);
}
DPRINTF(("ldap_bind() ok"), 1);
return((VOID *) ld);
}
void
sudo_ldap_update_defaults(v)
VOID *v;
{
LDAP *ld = (LDAP *) v;
LDAPMessage *entry = NULL, *result = NULL; /* used for searches */
int rc; /* temp return value */
rc = ldap_search_s(ld, ldap_conf.base, LDAP_SCOPE_ONELEVEL,
"cn=defaults", NULL, 0, &result);
if (!rc && (entry = ldap_first_entry(ld, result))) {
DPRINTF(("found:%s", ldap_get_dn(ld, entry)), 1);
sudo_ldap_parse_options(ld, entry);
} else
DPRINTF(("no default options found!"), 1);
if (result)
ldap_msgfree(result);
}
/*
* like sudoers_lookup() - only LDAP style
*/
int
sudo_ldap_check(v, pwflag)
VOID *v;
int pwflag;
{
LDAP *ld = (LDAP *) v;
LDAPMessage *entry = NULL, *result = NULL; /* used for searches */
char *filt; /* used to parse attributes */
int rc = FALSE, ret = FALSE, pass = FALSE; /* temp/final return values */
int ldap_user_matches = FALSE, ldap_host_matches = FALSE; /* flags */
/*
* 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
* user netgroups. Then we take the netgroups returned and
* try to match them against the username.
*/
for (pass = 1; !ret && pass <= 2; pass++) {
if (pass == 1) {
/* Want the entries that match our usernames or groups */
filt = sudo_ldap_build_pass1();
} else { /* pass=2 */
/* Want the entries that have user netgroups in them. */
filt = estrdup("sudoUser=+*");
}
DPRINTF(("ldap search '%s'", filt), 1);
rc = ldap_search_s(ld, ldap_conf.base, LDAP_SCOPE_ONELEVEL, filt,
NULL, 0, &result);
if (rc)
DPRINTF(("nothing found for '%s'", filt), 1);
efree(filt);
/* parse each entry returned from this most recent search */
entry = rc ? NULL : ldap_first_entry(ld, result);
while (entry != NULL) {
DPRINTF(("found:%s", ldap_get_dn(ld, entry)), 1);
if (
/* first verify user netgroup matches - only if in pass 2 */
(pass != 2 || sudo_ldap_check_user_netgroup(ld, entry)) &&
/* remember that user matched */
(ldap_user_matches = -1) &&
/* verify host match */
sudo_ldap_check_host(ld, entry) &&
/* remember that host matched */
(ldap_host_matches = -1) &&
/* add matches for listing later */
sudo_ldap_add_match(ld, entry, pwflag) &&
/* verify command match */
sudo_ldap_check_command(ld, entry) &&
/* verify runas match */
sudo_ldap_check_runas(ld, entry)
) {
/* We have a match! */
DPRINTF(("Perfect Matched!"), 1);
/* pick up any options */
sudo_ldap_parse_options(ld, entry);
/* make sure we don't reenter loop */
ret = VALIDATE_OK;
/* break from inside for loop */
break;
}
entry = ldap_next_entry(ld, entry);
}
if (result)
ldap_msgfree(result);
result = NULL;
}
DPRINTF(("user_matches=%d", ldap_user_matches), 1);
DPRINTF(("host_matches=%d", ldap_host_matches), 1);
/* Check for special case for -v, -k, -l options */
if (pwflag && ldap_user_matches && ldap_host_matches) {
/*
* Handle verifypw & listpw
*
* To be extra paranoid, since we haven't read any NOPASSWD options
* in /etc/sudoers yet, but we have to make the decission now, lets
* assume the worst and prefer to prompt for password unless the setting
* is "never". (example verifypw=never or listpw=never)
*
*/
ret = VALIDATE_OK;
if (pwflag != -1) {
switch (sudo_defs_table[pwflag].sd_un.tuple) {
case never:
def_authenticate = FALSE;
break;
case always:
if (def_authenticate)
SET(ret, FLAG_CHECK_USER);
break;
default:
break;
}
}
}
if (!ISSET(ret, VALIDATE_OK)) {
/* we do not have a match */
ret = VALIDATE_NOT_OK;
if (pwflag)
SET(ret, FLAG_NO_CHECK);
else if (!ldap_user_matches)
SET(ret, FLAG_NO_USER);
else if (!ldap_host_matches)
SET(ret, FLAG_NO_HOST);
}
DPRINTF(("sudo_ldap_check(%d)=0x%02x", pwflag, ret), 1);
return(ret);
}
/*
* shut down LDAP connection
*/
void
sudo_ldap_close(v)
VOID *v;
{
if (v)
ldap_unbind_s((LDAP *) v);
}
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