/*
* Copyright (c) 2007-2013 Todd C. Miller <Todd.Miller@courtesan.com>
*
* 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/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>
#endif /* HAVE_STRING_H */
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif /* HAVE_STRINGS_H */
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#include <pwd.h>
#include <grp.h>
#include <ctype.h>
#include "sudoers.h"
#include "lbuf.h"
extern struct sudo_nss sudo_nss_file;
#ifdef HAVE_LDAP
extern struct sudo_nss sudo_nss_ldap;
#endif
#ifdef HAVE_SSSD
extern struct sudo_nss sudo_nss_sss;
#endif
#if (defined(HAVE_LDAP) || defined(HAVE_SSSD)) && defined(_PATH_NSSWITCH_CONF)
/*
* Read in /etc/nsswitch.conf
* Returns a tail queue of matches.
*/
struct sudo_nss_list *
sudo_read_nss(void)
{
FILE *fp;
char *cp, *line = NULL;
size_t linesize = 0;
#ifdef HAVE_SSSD
bool saw_sss = false;
#endif
bool saw_files = false;
bool saw_ldap = false;
bool got_match = false;
static struct sudo_nss_list snl;
debug_decl(sudo_read_nss, SUDO_DEBUG_NSS)
if ((fp = fopen(_PATH_NSSWITCH_CONF, "r")) == NULL)
goto nomatch;
while (sudo_parseln(&line, &linesize, NULL, fp) != -1) {
/* Skip blank or comment lines */
if (*line == '\0')
continue;
/* Look for a line starting with "sudoers:" */
if (strncasecmp(line, "sudoers:", 8) != 0)
continue;
/* Parse line */
for ((cp = strtok(line + 8, " \t")); cp != NULL; (cp = strtok(NULL, " \t"))) {
if (strcasecmp(cp, "files") == 0 && !saw_files) {
tq_append(&snl, &sudo_nss_file);
got_match = true;
#ifdef HAVE_LDAP
} else if (strcasecmp(cp, "ldap") == 0 && !saw_ldap) {
tq_append(&snl, &sudo_nss_ldap);
got_match = true;
#endif
#ifdef HAVE_SSSD
} else if (strcasecmp(cp, "sss") == 0 && !saw_sss) {
tq_append(&snl, &sudo_nss_sss);
got_match = true;
#endif
} else if (strcasecmp(cp, "[NOTFOUND=return]") == 0 && got_match) {
/* NOTFOUND affects the most recent entry */
tq_last(&snl)->ret_if_notfound = true;
got_match = false;
} else if (strcasecmp(cp, "[SUCCESS=return]") == 0 && got_match) {
/* SUCCESS affects the most recent entry */
tq_last(&snl)->ret_if_found = true;
got_match = false;
} else
got_match = false;
}
/* Only parse the first "sudoers:" line */
break;
}
free(line);
fclose(fp);
nomatch:
/* Default to files only if no matches */
if (tq_empty(&snl))
tq_append(&snl, &sudo_nss_file);
debug_return_ptr(&snl);
}
#else /* (HAVE_LDAP || HAVE_SSSD) && _PATH_NSSWITCH_CONF */
# if (defined(HAVE_LDAP) || defined(HAVE_SSSD)) && defined(_PATH_NETSVC_CONF)
/*
* Read in /etc/netsvc.conf (like nsswitch.conf on AIX)
* Returns a tail queue of matches.
*/
struct sudo_nss_list *
sudo_read_nss(void)
{
FILE *fp;
char *cp, *ep, *line = NULL;
ssize_t linesize = 0;
#ifdef HAVE_SSSD
bool saw_sss = false;
#endif
bool saw_files = false;
bool saw_ldap = false;
bool got_match = false;
static struct sudo_nss_list snl;
debug_decl(sudo_read_nss, SUDO_DEBUG_NSS)
if ((fp = fopen(_PATH_NETSVC_CONF, "r")) == NULL)
goto nomatch;
while (sudo_parseln(&line, &linesize, NULL, fp) != -1) {
/* Skip blank or comment lines */
if (*(cp = line) == '\0')
continue;
/* Look for a line starting with "sudoers = " */
if (strncasecmp(cp, "sudoers", 7) != 0)
continue;
cp += 7;
while (isspace((unsigned char)*cp))
cp++;
if (*cp++ != '=')
continue;
/* Parse line */
for ((cp = strtok(cp, ",")); cp != NULL; (cp = strtok(NULL, ","))) {
/* Trim leading whitespace. */
while (isspace((unsigned char)*cp))
cp++;
if (!saw_files && strncasecmp(cp, "files", 5) == 0 &&
(isspace((unsigned char)cp[5]) || cp[5] == '\0')) {
tq_append(&snl, &sudo_nss_file);
got_match = true;
ep = &cp[5];
#ifdef HAVE_LDAP
} else if (!saw_ldap && strncasecmp(cp, "ldap", 4) == 0 &&
(isspace((unsigned char)cp[4]) || cp[4] == '\0')) {
tq_append(&snl, &sudo_nss_ldap);
got_match = true;
ep = &cp[4];
#endif
#ifdef HAVE_SSSD
} else if (!saw_sss && strncasecmp(cp, "sss", 3) == 0 &&
(isspace((unsigned char)cp[3]) || cp[3] == '\0')) {
tq_append(&snl, &sudo_nss_sss);
got_match = true;
ep = &cp[3];
#endif
} else {
got_match = false;
}
/* check for = auth qualifier */
if (got_match && *ep) {
cp = ep;
while (isspace((unsigned char)*cp) || *cp == '=')
cp++;
if (strncasecmp(cp, "auth", 4) == 0 &&
(isspace((unsigned char)cp[4]) || cp[4] == '\0')) {
tq_last(&snl)->ret_if_found = true;
}
}
}
/* Only parse the first "sudoers" line */
break;
}
fclose(fp);
nomatch:
/* Default to files only if no matches */
if (tq_empty(&snl))
tq_append(&snl, &sudo_nss_file);
debug_return_ptr(&snl);
}
# else /* !_PATH_NETSVC_CONF && !_PATH_NSSWITCH_CONF */
/*
* Non-nsswitch.conf version with hard-coded order.
*/
struct sudo_nss_list *
sudo_read_nss(void)
{
static struct sudo_nss_list snl;
debug_decl(sudo_read_nss, SUDO_DEBUG_NSS)
# ifdef HAVE_SSSD
tq_append(&snl, &sudo_nss_sss);
# endif
# ifdef HAVE_LDAP
tq_append(&snl, &sudo_nss_ldap);
# endif
tq_append(&snl, &sudo_nss_file);
debug_return_ptr(&snl);
}
# endif /* !HAVE_LDAP || !_PATH_NETSVC_CONF */
#endif /* HAVE_LDAP && _PATH_NSSWITCH_CONF */
static int
output(const char *buf)
{
struct sudo_conv_message msg;
struct sudo_conv_reply repl;
debug_decl(output, SUDO_DEBUG_NSS)
/* Call conversation function */
memset(&msg, 0, sizeof(msg));
msg.msg_type = SUDO_CONV_INFO_MSG;
msg.msg = buf;
memset(&repl, 0, sizeof(repl));
if (sudo_conv(1, &msg, &repl) == -1)
debug_return_int(0);
debug_return_int(strlen(buf));
}
/*
* Print out privileges for the specified user.
* We only get here if the user is allowed to run something.
*/
void
display_privs(struct sudo_nss_list *snl, struct passwd *pw)
{
struct sudo_nss *nss;
struct lbuf defs, privs;
struct stat sb;
int cols, count, olen;
debug_decl(display_privs, SUDO_DEBUG_NSS)
cols = sudo_user.cols;
if (fstat(STDOUT_FILENO, &sb) == 0 && S_ISFIFO(sb.st_mode))
cols = 0;
lbuf_init(&defs, output, 4, NULL, cols);
lbuf_init(&privs, output, 8, NULL, cols);
/* Display defaults from all sources. */
lbuf_append(&defs, _("Matching Defaults entries for %s on %s:\n"),
pw->pw_name, user_srunhost);
count = 0;
tq_foreach_fwd(snl, nss) {
count += nss->display_defaults(nss, pw, &defs);
}
if (count)
lbuf_append(&defs, "\n\n");
else
defs.len = 0;
/* Display Runas and Cmnd-specific defaults from all sources. */
olen = defs.len;
lbuf_append(&defs, _("Runas and Command-specific defaults for %s:\n"),
pw->pw_name);
count = 0;
tq_foreach_fwd(snl, nss) {
count += nss->display_bound_defaults(nss, pw, &defs);
}
if (count)
lbuf_append(&defs, "\n\n");
else
defs.len = olen;
/* Display privileges from all sources. */
lbuf_append(&privs,
_("User %s may run the following commands on %s:\n"),
pw->pw_name, user_srunhost);
count = 0;
tq_foreach_fwd(snl, nss) {
count += nss->display_privs(nss, pw, &privs);
}
if (count == 0) {
defs.len = 0;
privs.len = 0;
lbuf_append(&privs, _("User %s is not allowed to run sudo on %s.\n"),
pw->pw_name, user_shost);
}
lbuf_print(&defs);
lbuf_print(&privs);
lbuf_destroy(&defs);
lbuf_destroy(&privs);
debug_return;
}
/*
* Check user_cmnd against sudoers and print the matching entry if the
* command is allowed.
* Returns true if the command is allowed, else false.
*/
bool
display_cmnd(struct sudo_nss_list *snl, struct passwd *pw)
{
struct sudo_nss *nss;
debug_decl(display_cmnd, SUDO_DEBUG_NSS)
tq_foreach_fwd(snl, nss) {
if (nss->display_cmnd(nss, pw) == 0)
debug_return_bool(true);
}
debug_return_bool(false);
}
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