Move common bits of ldap to sudoers conversion into ldap_common.c
and use it in sssd.c.
This commit is contained in:
Todd C. Miller
428
plugins/sudoers/ldap_common.c
Normal file
428
plugins/sudoers/ldap_common.c
Normal file
@@ -0,0 +1,428 @@
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/*
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* Copyright (c) 2013, 2016, 2018 Todd C. Miller <Todd.Miller@sudo.ws>
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*
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* This code is derived from software contributed by Aaron Spangler.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <config.h>
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#include <sys/types.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stddef.h>
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif /* HAVE_STRING_H */
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif /* HAVE_STRINGS_H */
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#include <ctype.h>
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#ifdef HAVE_LBER_H
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# include <lber.h>
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#endif
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#include <ldap.h>
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#include "sudoers.h"
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#include "parse.h"
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#include "gram.h"
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#include "sudo_lbuf.h"
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#include "sudo_ldap.h"
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/*
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* Returns true if the string pointed to by valp begins with an
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* odd number of '!' characters. Intervening blanks are ignored.
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* Stores the address of the string after '!' removal in valp.
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*/
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bool
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sudo_ldap_is_negated(char **valp)
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{
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char *val = *valp;
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bool ret = false;
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debug_decl(sudo_ldap_is_negated, SUDOERS_DEBUG_LDAP)
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while (*val == '!') {
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ret = !ret;
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do {
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val++;
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} while (isblank((unsigned char)*val));
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}
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*valp = val;
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debug_return_bool(ret);
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}
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/*
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* Parse an option string into a defaults structure.
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* The members of def are pointers into optstr (which is modified).
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*/
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int
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sudo_ldap_parse_option(char *optstr, char **varp, char **valp)
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{
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char *cp, *val = NULL;
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char *var = optstr;
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int op;
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debug_decl(sudo_ldap_parse_option, SUDOERS_DEBUG_LDAP)
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/* check for equals sign past first char */
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cp = strchr(var, '=');
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if (cp > var) {
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val = cp + 1;
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op = cp[-1]; /* peek for += or -= cases */
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if (op == '+' || op == '-') {
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/* case var+=val or var-=val */
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cp--;
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} else {
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/* case var=val */
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op = true;
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}
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/* Trim whitespace between var and operator. */
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while (cp > var && isblank((unsigned char)cp[-1]))
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cp--;
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/* Truncate variable name. */
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*cp = '\0';
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/* Trim leading whitespace from val. */
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while (isblank((unsigned char)*val))
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val++;
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/* Strip double quotes if present. */
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if (*val == '"') {
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char *ep = val + strlen(val);
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if (ep != val && ep[-1] == '"') {
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val++;
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ep[-1] = '\0';
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}
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}
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} else {
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/* Boolean value, either true or false. */
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op = sudo_ldap_is_negated(&var) ? false : true;
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}
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*varp = var;
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*valp = val;
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debug_return_int(op);
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}
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/*
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* Convert an array to a member list.
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* The caller is responsible for freeing the returned struct member_list.
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*/
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static struct member_list *
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array_to_member_list(void *a, size_t ele_size, size_t str_off)
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{
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struct member_list *members;
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struct member *m;
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debug_decl(bv_to_member_list, SUDOERS_DEBUG_LDAP)
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if ((members = calloc(1, sizeof(*members))) == NULL)
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return NULL;
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TAILQ_INIT(members);
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for (;*((char **)a) != NULL; a = (char *)a + ele_size) {
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char *val = *(char **)(*((char **)a) + str_off);
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if ((m = calloc(1, sizeof(*m))) == NULL)
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goto bad;
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switch (val[0]) {
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case '\0':
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/* Empty RunAsUser means run as the invoking user. */
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m->type = MYSELF;
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break;
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case 'A':
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if (strcmp(val, "ALL") == 0) {
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m->type = ALL;
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break;
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}
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/* FALLTHROUGH */
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default:
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m->type = WORD;
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m->name = strdup(val);
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if (m->name == NULL) {
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free(m);
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goto bad;
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}
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break;
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}
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TAILQ_INSERT_TAIL(members, m, entries);
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}
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debug_return_ptr(members);
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bad:
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while ((m = TAILQ_FIRST(members)) != NULL) {
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TAILQ_REMOVE(members, m, entries);
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free(m->name);
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free(m);
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}
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free(members);
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debug_return_ptr(NULL);
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}
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/*
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* Convert an LDAP sudoRole to a sudoers privilege.
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* Pass in struct berval ** for LDAP or char *** for SSSD.
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*/
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struct privilege *
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sudo_ldap_role_to_priv(const char *cn, void *runasusers, void *runasgroups,
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void *cmnds, void *opts, const char *notbefore,
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const char *notafter, size_t ele_size, size_t str_off)
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{
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struct cmndspec *cmndspec = NULL;
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struct cmndspec *prev_cmndspec = NULL;
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struct sudo_command *c;
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struct privilege *priv;
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struct member *m;
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debug_decl(sudo_ldap_role_to_priv, SUDOERS_DEBUG_LDAP)
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if ((priv = calloc(1, sizeof(*priv))) == NULL)
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goto oom;
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TAILQ_INIT(&priv->hostlist);
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TAILQ_INIT(&priv->cmndlist);
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TAILQ_INIT(&priv->defaults);
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priv->ldap_role = strdup(cn ? cn : "UNKNOWN");
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if (priv->ldap_role == NULL)
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goto oom;
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/* The host has already matched, use ALL as wildcard. */
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if ((m = calloc(1, sizeof(*m))) == NULL)
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goto oom;
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m->type = ALL;
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TAILQ_INSERT_TAIL(&priv->hostlist, m, entries);
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/*
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* Parse sudoCommands and add to cmndlist.
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* The convoluted pointer arithmetic is to support passing in
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* either a struct berval ** or a char ***.
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* An interator would probably be better.
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*/
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for (;*((char **)cmnds) != NULL; cmnds = (char *)cmnds + ele_size) {
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char *cmnd = *(char **)(*((char **)cmnds) + str_off);
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char *args;
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/* Allocate storage upfront. */
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cmndspec = calloc(1, sizeof(*cmndspec));
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c = calloc(1, sizeof(*c));
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m = calloc(1, sizeof(*m));
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if (cmndspec == NULL || c == NULL || m == NULL) {
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free(cmndspec);
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free(c);
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free(m);
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goto oom;
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}
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TAILQ_INSERT_TAIL(&priv->cmndlist, cmndspec, entries);
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/* Initialize cmndspec */
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TAGS_INIT(cmndspec->tags);
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cmndspec->notbefore = UNSPEC;
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cmndspec->notafter = UNSPEC;
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cmndspec->timeout = UNSPEC;
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/* Fill in command. */
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if ((args = strpbrk(cmnd, " \t")) != NULL) {
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*args++ = '\0';
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if ((c->args = strdup(args)) == NULL) {
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free(c);
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free(m);
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goto oom;
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}
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}
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if ((c->cmnd = strdup(cmnd)) == NULL) {
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free(c->args);
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free(c);
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free(m);
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goto oom;
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}
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m->type = COMMAND;
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m->name = (char *)c;
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cmndspec->cmnd = m;
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if (prev_cmndspec != NULL) {
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/* Inherit values from prior cmndspec */
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cmndspec->runasuserlist = prev_cmndspec->runasuserlist;
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cmndspec->runasgrouplist = prev_cmndspec->runasgrouplist;
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cmndspec->notbefore = prev_cmndspec->notbefore;
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cmndspec->notafter = prev_cmndspec->notafter;
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cmndspec->tags = prev_cmndspec->tags;
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} else {
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/* Parse sudoRunAsUser / sudoRunAs */
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if (runasusers != NULL) {
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cmndspec->runasuserlist =
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array_to_member_list(runasusers, ele_size, str_off);
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if (cmndspec->runasuserlist == NULL)
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goto oom;
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}
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/* Parse sudoRunAsGroup */
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if (runasgroups != NULL) {
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cmndspec->runasgrouplist =
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array_to_member_list(runasgroups, ele_size, str_off);
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if (cmndspec->runasgrouplist == NULL)
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goto oom;
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}
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/* Parse sudoNotBefore / sudoNotAfter */
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if (notbefore != NULL)
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cmndspec->notbefore = parse_gentime(notbefore);
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if (notafter != NULL)
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cmndspec->notbefore = parse_gentime(notafter);
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/* Parse sudoOptions. */
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if (opts != NULL) {
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for (; *((char **)opts) != NULL; opts = (char *)opts + ele_size) {
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char *opt = *(char **)(*((char **)opts) + str_off);
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char *var, *val;
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int op;
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op = sudo_ldap_parse_option(opt, &var, &val);
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if (strcmp(var, "command_timeout") == 0) {
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if (op == '=')
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cmndspec->timeout = parse_timeout(val);
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#ifdef HAVE_SELINUX
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} else if (strcmp(var, "role") == 0) {
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if (op == '=') {
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if ((cmndspec->role = strdup(val)) == NULL)
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goto oom;
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}
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} else if (strcmp(var, "type") == 0) {
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if (op == '=') {
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if ((cmndspec->type = strdup(val)) == NULL)
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goto oom;
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}
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#endif /* HAVE_SELINUX */
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#ifdef HAVE_PRIV_SET
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} else if (strcmp(var, "privs") == 0) {
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if (op == '=') {
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if ((cmndspec->privs = strdup(val)) == NULL)
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goto oom;
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}
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} else if (strcmp(val, "limitprivs") == 0) {
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if (op == '=') {
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if ((cmndspec->limitprivs = strdup(val)) == NULL)
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goto oom;
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}
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#endif /* HAVE_PRIV_SET */
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} else if (long_list) {
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struct defaults *def = calloc(1, sizeof(*def));
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if (def == NULL)
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goto oom;
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def->op = op;
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if ((def->var = strdup(var)) == NULL) {
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free(def);
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goto oom;
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}
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if (val != NULL) {
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if ((def->val = strdup(val)) == NULL) {
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free(def->var);
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free(def);
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goto oom;
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}
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}
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TAILQ_INSERT_TAIL(&priv->defaults, def, entries);
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} else {
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/* Convert to tags. */
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if (op != true && op != false)
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continue;
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if (strcmp(var, "authenticate") == 0) {
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cmndspec->tags.nopasswd = op == false;
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} else if (strcmp(var, "sudoedit_follow") == 0) {
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cmndspec->tags.follow = op == true;
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} else if (strcmp(var, "noexec") == 0) {
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cmndspec->tags.noexec = op == true;
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} else if (strcmp(var, "setenv") == 0) {
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cmndspec->tags.setenv = op == true;
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} else if (strcmp(var, "mail_all_cmnds") == 0 ||
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strcmp(var, "mail_always") == 0) {
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cmndspec->tags.send_mail = op == true;
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}
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}
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}
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}
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/* So we can inherit previous values. */
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prev_cmndspec = cmndspec;
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}
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}
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debug_return_ptr(priv);
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oom:
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sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
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if (priv != NULL)
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free_privilege(priv);
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debug_return_ptr(NULL);
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}
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/*
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* If a digest prefix is present, fills in struct sudo_digest
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* and returns a pointer to it, updating cmnd to point to the
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* command after the digest.
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*/
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struct sudo_digest *
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sudo_ldap_extract_digest(char **cmnd, struct sudo_digest *digest)
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{
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char *ep, *cp = *cmnd;
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int digest_type = SUDO_DIGEST_INVALID;
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debug_decl(sudo_ldap_check_command, SUDOERS_DEBUG_LDAP)
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/*
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* Check for and extract a digest prefix, e.g.
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* sha224:d06a2617c98d377c250edd470fd5e576327748d82915d6e33b5f8db1 /bin/ls
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*/
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if (cp[0] == 's' && cp[1] == 'h' && cp[2] == 'a') {
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switch (cp[3]) {
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case '2':
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if (cp[4] == '2' && cp[5] == '4')
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digest_type = SUDO_DIGEST_SHA224;
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else if (cp[4] == '5' && cp[5] == '6')
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digest_type = SUDO_DIGEST_SHA256;
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break;
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case '3':
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if (cp[4] == '8' && cp[5] == '4')
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digest_type = SUDO_DIGEST_SHA384;
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break;
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case '5':
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if (cp[4] == '1' && cp[5] == '2')
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digest_type = SUDO_DIGEST_SHA512;
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break;
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}
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if (digest_type != SUDO_DIGEST_INVALID) {
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cp += 6;
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while (isblank((unsigned char)*cp))
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cp++;
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if (*cp == ':') {
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cp++;
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while (isblank((unsigned char)*cp))
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cp++;
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ep = cp;
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while (*ep != '\0' && !isblank((unsigned char)*ep))
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ep++;
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if (*ep != '\0') {
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digest->digest_type = digest_type;
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digest->digest_str = strndup(cp, (size_t)(ep - cp));
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if (digest->digest_str == NULL) {
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sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
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debug_return_ptr(NULL);
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}
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cp = ep + 1;
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while (isblank((unsigned char)*cp))
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cp++;
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*cmnd = cp;
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sudo_debug_printf(SUDO_DEBUG_INFO,
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"%s digest %s for %s",
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digest_type_to_name(digest_type),
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digest->digest_str, cp);
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debug_return_ptr(digest);
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}
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}
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}
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}
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debug_return_ptr(NULL);
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}
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