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1e5af355642ee3b4940778b8055556273cf94d64
sudo/plugins/sudoers/parse.c
Todd C. Miller 1e5af35564 Refactor code to convert defaults to tags and do conversion on 
output for "sudo -l".

Remove the short_list (was long_list) global in favor of a verbose
argument.
2018-08-05 07:17:34 -06:00

862 lines
24 KiB
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/*
* Copyright (c) 2004-2005, 2007-2018 Todd C. Miller <Todd.Miller@sudo.ws>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <config.h>
#include <sys/types.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 <ctype.h>
#include <grp.h>
#include <pwd.h>
#include <time.h>
#include "sudoers.h"
#include "sudo_lbuf.h"
#include <gram.h>
/*
* Look up the user in the sudoers prase tree for pseudo-commands like
* list, verify and kill.
*/
static int
sudoers_lookup_pseudo(struct sudo_nss_list *snl, struct passwd *pw,
int validated, int pwflag)
{
int match;
struct sudo_nss *nss;
struct cmndspec *cs;
struct privilege *priv;
struct userspec *us;
struct defaults *def;
int nopass;
enum def_tuple pwcheck;
debug_decl(sudoers_lookup_pseudo, SUDOERS_DEBUG_PARSER)
pwcheck = (pwflag == -1) ? never : sudo_defs_table[pwflag].sd_un.tuple;
nopass = (pwcheck == all) ? true : false;
if (list_pw == NULL)
SET(validated, FLAG_NO_CHECK);
CLR(validated, FLAG_NO_USER);
CLR(validated, FLAG_NO_HOST);
match = DENY;
TAILQ_FOREACH(nss, snl, entries) {
if (nss->query(nss, pw) == -1) {
/* The query function should have printed an error message. */
SET(validated, VALIDATE_ERROR);
break;
}
TAILQ_FOREACH(us, &nss->parse_tree->userspecs, entries) {
if (userlist_matches(nss->parse_tree, pw, &us->users) != ALLOW)
continue;
TAILQ_FOREACH(priv, &us->privileges, entries) {
int priv_nopass = UNSPEC;
if (hostlist_matches(nss->parse_tree, pw, &priv->hostlist) != ALLOW)
continue;
TAILQ_FOREACH(def, &priv->defaults, entries) {
if (strcmp(def->var, "authenticate") == 0)
priv_nopass = !def->op;
}
TAILQ_FOREACH(cs, &priv->cmndlist, entries) {
if (pwcheck == any) {
if (cs->tags.nopasswd == true || priv_nopass == true)
nopass = true;
} else if (pwcheck == all) {
if (cs->tags.nopasswd != true && priv_nopass != true)
nopass = false;
}
if (match == ALLOW)
continue;
/* Only check the command when listing another user. */
if (user_uid == 0 || list_pw == NULL ||
user_uid == list_pw->pw_uid ||
cmnd_matches(nss->parse_tree, cs->cmnd) == ALLOW)
match = ALLOW;
}
}
}
}
if (match == ALLOW || user_uid == 0) {
/* User has an entry for this host. */
SET(validated, VALIDATE_SUCCESS);
} else if (match == DENY)
SET(validated, VALIDATE_FAILURE);
if (pwcheck == always && def_authenticate)
SET(validated, FLAG_CHECK_USER);
else if (nopass == true)
def_authenticate = false;
debug_return_int(validated);
}
static int
sudoers_lookup_check(struct sudo_nss *nss, struct passwd *pw,
int *validated, struct cmndspec **matching_cs,
struct defaults_list **defs, time_t now)
{
int host_match, runas_match, cmnd_match;
struct cmndspec *cs;
struct privilege *priv;
struct userspec *us;
struct member *matching_user;
debug_decl(sudoers_lookup_check, SUDOERS_DEBUG_PARSER)
TAILQ_FOREACH_REVERSE(us, &nss->parse_tree->userspecs, userspec_list, entries) {
if (userlist_matches(nss->parse_tree, pw, &us->users) != ALLOW)
continue;
CLR(*validated, FLAG_NO_USER);
TAILQ_FOREACH_REVERSE(priv, &us->privileges, privilege_list, entries) {
host_match = hostlist_matches(nss->parse_tree, pw, &priv->hostlist);
if (host_match == ALLOW)
CLR(*validated, FLAG_NO_HOST);
else
continue;
TAILQ_FOREACH_REVERSE(cs, &priv->cmndlist, cmndspec_list, entries) {
if (cs->notbefore != UNSPEC) {
if (now < cs->notbefore)
continue;
}
if (cs->notafter != UNSPEC) {
if (now > cs->notafter)
continue;
}
matching_user = NULL;
runas_match = runaslist_matches(nss->parse_tree,
cs->runasuserlist, cs->runasgrouplist, &matching_user,
NULL);
if (runas_match == ALLOW) {
cmnd_match = cmnd_matches(nss->parse_tree, cs->cmnd);
if (cmnd_match != UNSPEC) {
/*
* If user is running command as himself,
* set runas_pw = sudo_user.pw.
* XXX - hack, want more general solution
*/
if (matching_user && matching_user->type == MYSELF) {
sudo_pw_delref(runas_pw);
sudo_pw_addref(sudo_user.pw);
runas_pw = sudo_user.pw;
}
*matching_cs = cs;
*defs = &priv->defaults;
debug_return_int(cmnd_match);
}
}
}
}
}
debug_return_int(UNSPEC);
}
/*
* Apply cmndspec-specific settngs including SELinux role/type,
* Solaris privs, and command tags.
*/
static bool
apply_cmndspec(struct cmndspec *cs)
{
debug_decl(apply_cmndspec, SUDOERS_DEBUG_PARSER)
if (cs != NULL) {
#ifdef HAVE_SELINUX
/* Set role and type if not specified on command line. */
if (user_role == NULL) {
if (cs->role != NULL) {
user_role = strdup(cs->role);
if (user_role == NULL) {
sudo_warnx(U_("%s: %s"), __func__,
U_("unable to allocate memory"));
debug_return_bool(false);
}
} else {
user_role = def_role;
}
}
if (user_type == NULL) {
if (cs->type != NULL) {
user_type = strdup(cs->type);
if (user_type == NULL) {
sudo_warnx(U_("%s: %s"), __func__,
U_("unable to allocate memory"));
debug_return_bool(false);
}
} else {
user_type = def_type;
}
}
#endif /* HAVE_SELINUX */
#ifdef HAVE_PRIV_SET
/* Set Solaris privilege sets */
if (runas_privs == NULL) {
if (cs->privs != NULL) {
runas_privs = strdup(cs->privs);
if (runas_privs == NULL) {
sudo_warnx(U_("%s: %s"), __func__,
U_("unable to allocate memory"));
debug_return_bool(false);
}
} else {
runas_privs = def_privs;
}
}
if (runas_limitprivs == NULL) {
if (cs->limitprivs != NULL) {
runas_limitprivs = strdup(cs->limitprivs);
if (runas_limitprivs == NULL) {
sudo_warnx(U_("%s: %s"), __func__,
U_("unable to allocate memory"));
debug_return_bool(false);
}
} else {
runas_limitprivs = def_limitprivs;
}
}
#endif /* HAVE_PRIV_SET */
if (cs->timeout > 0)
def_command_timeout = cs->timeout;
if (cs->tags.nopasswd != UNSPEC)
def_authenticate = !cs->tags.nopasswd;
if (cs->tags.noexec != UNSPEC)
def_noexec = cs->tags.noexec;
if (cs->tags.setenv != UNSPEC)
def_setenv = cs->tags.setenv;
if (cs->tags.log_input != UNSPEC)
def_log_input = cs->tags.log_input;
if (cs->tags.log_output != UNSPEC)
def_log_output = cs->tags.log_output;
if (cs->tags.send_mail != UNSPEC) {
if (cs->tags.send_mail) {
def_mail_all_cmnds = true;
} else {
def_mail_all_cmnds = false;
def_mail_always = false;
def_mail_no_perms = false;
}
}
if (cs->tags.follow != UNSPEC)
def_sudoedit_follow = cs->tags.follow;
}
debug_return_bool(true);
}
/*
* Look up the user in the sudoers prase tree and check to see if they are
* allowed to run the specified command on this host as the target user.
*/
int
sudoers_lookup(struct sudo_nss_list *snl, struct passwd *pw, int validated,
int pwflag)
{
struct defaults_list *defs = NULL;
struct sudoers_parse_tree *parse_tree = NULL;
struct cmndspec *cs = NULL;
struct sudo_nss *nss;
int m, match = UNSPEC;
time_t now;
debug_decl(sudoers_lookup, SUDOERS_DEBUG_PARSER)
/*
* Special case checking the "validate", "list" and "kill" pseudo-commands.
*/
if (pwflag)
debug_return_int(sudoers_lookup_pseudo(snl, pw, validated, pwflag));
/* Need to be runas user while stat'ing things. */
if (!set_perms(PERM_RUNAS))
debug_return_int(validated);
/* Query each sudoers source and check the user. */
time(&now);
TAILQ_FOREACH(nss, snl, entries) {
if (nss->query(nss, pw) == -1) {
/* The query function should have printed an error message. */
SET(validated, VALIDATE_ERROR);
break;
}
m = sudoers_lookup_check(nss, pw, &validated, &cs, &defs, now);
if (m != UNSPEC) {
match = m;
parse_tree = nss->parse_tree;
}
if (!sudo_nss_can_continue(nss, m))
break;
}
if (match != UNSPEC) {
if (defs != NULL)
update_defaults(parse_tree, defs, SETDEF_GENERIC, false);
if (!apply_cmndspec(cs))
SET(validated, VALIDATE_ERROR);
else if (match == ALLOW)
SET(validated, VALIDATE_SUCCESS);
else
SET(validated, VALIDATE_FAILURE);
}
if (!restore_perms())
SET(validated, VALIDATE_ERROR);
debug_return_int(validated);
}
static int
display_priv_short(struct sudoers_parse_tree *parse_tree, struct passwd *pw,
struct userspec *us, struct sudo_lbuf *lbuf)
{
struct privilege *priv;
int nfound = 0;
debug_decl(display_priv_short, SUDOERS_DEBUG_PARSER)
TAILQ_FOREACH(priv, &us->privileges, entries) {
struct cmndspec *cs, *prev_cs = NULL;
struct cmndtag tags;
if (hostlist_matches(parse_tree, pw, &priv->hostlist) != ALLOW)
continue;
sudoers_defaults_list_to_tags(&priv->defaults, &tags);
TAILQ_FOREACH(cs, &priv->cmndlist, entries) {
/* Start a new line if RunAs changes. */
if (prev_cs == NULL || RUNAS_CHANGED(cs, prev_cs)) {
struct member *m;
if (cs != TAILQ_FIRST(&priv->cmndlist))
sudo_lbuf_append(lbuf, "\n");
sudo_lbuf_append(lbuf, " (");
if (cs->runasuserlist != NULL) {
TAILQ_FOREACH(m, cs->runasuserlist, entries) {
if (m != TAILQ_FIRST(cs->runasuserlist))
sudo_lbuf_append(lbuf, ", ");
sudoers_format_member(lbuf, parse_tree, m, ", ",
RUNASALIAS);
}
} else if (cs->runasgrouplist == NULL) {
sudo_lbuf_append(lbuf, "%s", def_runas_default);
} else {
sudo_lbuf_append(lbuf, "%s", pw->pw_name);
}
if (cs->runasgrouplist != NULL) {
sudo_lbuf_append(lbuf, " : ");
TAILQ_FOREACH(m, cs->runasgrouplist, entries) {
if (m != TAILQ_FIRST(cs->runasgrouplist))
sudo_lbuf_append(lbuf, ", ");
sudoers_format_member(lbuf, parse_tree, m, ", ",
RUNASALIAS);
}
}
sudo_lbuf_append(lbuf, ") ");
} else if (cs != TAILQ_FIRST(&priv->cmndlist)) {
sudo_lbuf_append(lbuf, ", ");
}
sudoers_format_cmndspec(lbuf, parse_tree, cs, prev_cs, tags, true);
prev_cs = cs;
nfound++;
}
sudo_lbuf_append(lbuf, "\n");
}
debug_return_int(nfound);
}
/*
* Compare the current cmndspec with the previous one to determine
* whether we need to start a new long entry for "sudo -ll".
* Returns true if we should start a new long entry, else false.
*/
static bool
new_long_entry(struct cmndspec *cs, struct cmndspec *prev_cs)
{
debug_decl(new_long_entry, SUDOERS_DEBUG_PARSER)
if (prev_cs == NULL)
debug_return_bool(true);
if (RUNAS_CHANGED(cs, prev_cs) || TAGS_CHANGED(prev_cs->tags, cs->tags))
debug_return_bool(true);
#ifdef HAVE_PRIV_SET
if (cs->privs && (!prev_cs->privs || strcmp(cs->privs, prev_cs->privs) != 0))
debug_return_bool(true);
if (cs->limitprivs && (!prev_cs->limitprivs || strcmp(cs->limitprivs, prev_cs->limitprivs) != 0))
debug_return_bool(true);
#endif /* HAVE_PRIV_SET */
#ifdef HAVE_SELINUX
if (cs->role && (!prev_cs->role || strcmp(cs->role, prev_cs->role) != 0))
debug_return_bool(true);
if (cs->type && (!prev_cs->type || strcmp(cs->type, prev_cs->type) != 0))
debug_return_bool(true);
#endif /* HAVE_SELINUX */
if (cs->timeout != prev_cs->timeout)
debug_return_bool(true);
if (cs->notbefore != prev_cs->notbefore)
debug_return_bool(true);
if (cs->notafter != prev_cs->notafter)
debug_return_bool(true);
debug_return_bool(false);
}
static int
display_priv_long(struct sudoers_parse_tree *parse_tree, struct passwd *pw,
struct userspec *us, struct sudo_lbuf *lbuf)
{
struct privilege *priv;
int nfound = 0;
debug_decl(display_priv_long, SUDOERS_DEBUG_PARSER)
TAILQ_FOREACH(priv, &us->privileges, entries) {
struct cmndspec *cs, *prev_cs;
if (hostlist_matches(parse_tree, pw, &priv->hostlist) != ALLOW)
continue;
prev_cs = NULL;
TAILQ_FOREACH(cs, &priv->cmndlist, entries) {
struct defaults *d;
struct member *m;
if (new_long_entry(cs, prev_cs)) {
int olen;
if (priv->ldap_role != NULL) {
sudo_lbuf_append(lbuf, _("\nLDAP Role: %s\n"),
priv->ldap_role);
} else {
sudo_lbuf_append(lbuf, _("\nSudoers entry:\n"));
}
sudo_lbuf_append(lbuf, _(" RunAsUsers: "));
if (cs->runasuserlist != NULL) {
TAILQ_FOREACH(m, cs->runasuserlist, entries) {
if (m != TAILQ_FIRST(cs->runasuserlist))
sudo_lbuf_append(lbuf, ", ");
sudoers_format_member(lbuf, parse_tree, m, ", ",
RUNASALIAS);
}
} else if (cs->runasgrouplist == NULL) {
sudo_lbuf_append(lbuf, "%s", def_runas_default);
} else {
sudo_lbuf_append(lbuf, "%s", pw->pw_name);
}
sudo_lbuf_append(lbuf, "\n");
if (cs->runasgrouplist != NULL) {
sudo_lbuf_append(lbuf, _(" RunAsGroups: "));
TAILQ_FOREACH(m, cs->runasgrouplist, entries) {
if (m != TAILQ_FIRST(cs->runasgrouplist))
sudo_lbuf_append(lbuf, ", ");
sudoers_format_member(lbuf, parse_tree, m, ", ",
RUNASALIAS);
}
sudo_lbuf_append(lbuf, "\n");
}
olen = lbuf->len;
sudo_lbuf_append(lbuf, _(" Options: "));
TAILQ_FOREACH(d, &priv->defaults, entries) {
sudoers_format_default(lbuf, d);
sudo_lbuf_append(lbuf, ", ");
}
if (TAG_SET(cs->tags.setenv))
sudo_lbuf_append(lbuf, "%ssetenv, ", cs->tags.setenv ? "" : "!");
if (TAG_SET(cs->tags.noexec))
sudo_lbuf_append(lbuf, "%snoexec, ", cs->tags.noexec ? "" : "!");
if (TAG_SET(cs->tags.nopasswd))
sudo_lbuf_append(lbuf, "%sauthenticate, ", cs->tags.nopasswd ? "!" : "");
if (TAG_SET(cs->tags.log_input))
sudo_lbuf_append(lbuf, "%slog_input, ", cs->tags.log_input ? "" : "!");
if (TAG_SET(cs->tags.log_output))
sudo_lbuf_append(lbuf, "%slog_output, ", cs->tags.log_output ? "" : "!");
if (lbuf->buf[lbuf->len - 2] == ',') {
lbuf->len -= 2; /* remove trailing ", " */
sudo_lbuf_append(lbuf, "\n");
} else {
lbuf->len = olen; /* no options */
}
#ifdef HAVE_PRIV_SET
if (cs->privs)
sudo_lbuf_append(lbuf, " Privs: %s\n", cs->privs);
if (cs->limitprivs)
sudo_lbuf_append(lbuf, " Limitprivs: %s\n", cs->limitprivs);
#endif /* HAVE_PRIV_SET */
#ifdef HAVE_SELINUX
if (cs->role)
sudo_lbuf_append(lbuf, " Role: %s\n", cs->role);
if (cs->type)
sudo_lbuf_append(lbuf, " Type: %s\n", cs->type);
#endif /* HAVE_SELINUX */
if (cs->timeout > 0) {
char numbuf[(((sizeof(int) * 8) + 2) / 3) + 2];
snprintf(numbuf, sizeof(numbuf), "%d", cs->timeout);
sudo_lbuf_append(lbuf, " Timeout: %s\n", numbuf);
}
if (cs->notbefore != UNSPEC) {
char buf[sizeof("CCYYMMDDHHMMSSZ")];
struct tm *tm = gmtime(&cs->notbefore);
snprintf(buf, sizeof(buf), "%04d%02d%02d%02d%02d%02dZ",
tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
tm->tm_hour, tm->tm_min, tm->tm_sec);
sudo_lbuf_append(lbuf, " NotBefore: %s\n", buf);
}
if (cs->notafter != UNSPEC) {
char buf[sizeof("CCYYMMDDHHMMSSZ")];
struct tm *tm = gmtime(&cs->notafter);
snprintf(buf, sizeof(buf), "%04d%02d%02d%02d%02d%02dZ",
tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
tm->tm_hour, tm->tm_min, tm->tm_sec);
sudo_lbuf_append(lbuf, " NotAfter: %s\n", buf);
}
sudo_lbuf_append(lbuf, _(" Commands:\n"));
}
sudo_lbuf_append(lbuf, "\t");
sudoers_format_member(lbuf, parse_tree, cs->cmnd, "\n\t",
CMNDALIAS);
sudo_lbuf_append(lbuf, "\n");
prev_cs = cs;
nfound++;
}
}
debug_return_int(nfound);
}
static int
sudo_display_userspecs(struct sudoers_parse_tree *parse_tree, struct passwd *pw,
struct sudo_lbuf *lbuf, bool verbose)
{
struct userspec *us;
int nfound = 0;
debug_decl(sudo_display_userspecs, SUDOERS_DEBUG_PARSER)
TAILQ_FOREACH(us, &parse_tree->userspecs, entries) {
if (userlist_matches(parse_tree, pw, &us->users) != ALLOW)
continue;
if (verbose)
nfound += display_priv_long(parse_tree, pw, us, lbuf);
else
nfound += display_priv_short(parse_tree, pw, us, lbuf);
}
if (sudo_lbuf_error(lbuf))
debug_return_int(-1);
debug_return_int(nfound);
}
/*
* Display matching Defaults entries for the given user on this host.
*/
static int
display_defaults(struct sudoers_parse_tree *parse_tree, struct passwd *pw,
struct sudo_lbuf *lbuf)
{
struct defaults *d;
char *prefix;
int nfound = 0;
debug_decl(display_defaults, SUDOERS_DEBUG_PARSER)
if (lbuf->len == 0 || isspace((unsigned char)lbuf->buf[lbuf->len - 1]))
prefix = " ";
else
prefix = ", ";
TAILQ_FOREACH(d, &parse_tree->defaults, entries) {
switch (d->type) {
case DEFAULTS_HOST:
if (hostlist_matches(parse_tree, pw, d->binding) != ALLOW)
continue;
break;
case DEFAULTS_USER:
if (userlist_matches(parse_tree, pw, d->binding) != ALLOW)
continue;
break;
case DEFAULTS_RUNAS:
case DEFAULTS_CMND:
continue;
}
sudo_lbuf_append(lbuf, "%s", prefix);
sudoers_format_default(lbuf, d);
prefix = ", ";
nfound++;
}
if (sudo_lbuf_error(lbuf))
debug_return_int(-1);
debug_return_int(nfound);
}
/*
* Display Defaults entries of the given type.
*/
static int
display_bound_defaults_by_type(struct sudoers_parse_tree *parse_tree,
int deftype, struct sudo_lbuf *lbuf)
{
struct defaults *d;
struct member_list *binding = NULL;
struct member *m;
char *dsep;
int atype, nfound = 0;
debug_decl(display_bound_defaults_by_type, SUDOERS_DEBUG_PARSER)
switch (deftype) {
case DEFAULTS_HOST:
atype = HOSTALIAS;
dsep = "@";
break;
case DEFAULTS_USER:
atype = USERALIAS;
dsep = ":";
break;
case DEFAULTS_RUNAS:
atype = RUNASALIAS;
dsep = ">";
break;
case DEFAULTS_CMND:
atype = CMNDALIAS;
dsep = "!";
break;
default:
debug_return_int(-1);
}
TAILQ_FOREACH(d, &parse_tree->defaults, entries) {
if (d->type != deftype)
continue;
nfound++;
if (binding != d->binding) {
binding = d->binding;
if (nfound != 1)
sudo_lbuf_append(lbuf, "\n");
sudo_lbuf_append(lbuf, " Defaults%s", dsep);
TAILQ_FOREACH(m, binding, entries) {
if (m != TAILQ_FIRST(binding))
sudo_lbuf_append(lbuf, ",");
sudoers_format_member(lbuf, parse_tree, m, ", ", atype);
sudo_lbuf_append(lbuf, " ");
}
} else
sudo_lbuf_append(lbuf, ", ");
sudoers_format_default(lbuf, d);
}
if (sudo_lbuf_error(lbuf))
debug_return_int(-1);
debug_return_int(nfound);
}
/*
* Display Defaults entries that are per-runas or per-command
*/
static int
display_bound_defaults(struct sudoers_parse_tree *parse_tree,
struct passwd *pw, struct sudo_lbuf *lbuf)
{
int nfound = 0;
debug_decl(display_bound_defaults, SUDOERS_DEBUG_PARSER)
/* XXX - should only print ones that match what the user can do. */
nfound += display_bound_defaults_by_type(parse_tree, DEFAULTS_RUNAS, lbuf);
nfound += display_bound_defaults_by_type(parse_tree, DEFAULTS_CMND, lbuf);
if (sudo_lbuf_error(lbuf))
debug_return_int(-1);
debug_return_int(nfound);
}
static int
output(const char *buf)
{
struct sudo_conv_message msg;
struct sudo_conv_reply repl;
debug_decl(output, SUDOERS_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, NULL) == -1)
debug_return_int(0);
debug_return_int(strlen(buf));
}
/*
* Print out privileges for the specified user.
* Returns true on success or -1 on error.
*/
int
display_privs(struct sudo_nss_list *snl, struct passwd *pw, bool verbose)
{
struct sudo_nss *nss;
struct sudo_lbuf def_buf, priv_buf;
struct stat sb;
int cols, count, olen, n;
debug_decl(display_privs, SUDOERS_DEBUG_PARSER)
cols = sudo_user.cols;
if (fstat(STDOUT_FILENO, &sb) == 0 && S_ISFIFO(sb.st_mode))
cols = 0;
sudo_lbuf_init(&def_buf, output, 4, NULL, cols);
sudo_lbuf_init(&priv_buf, output, 8, NULL, cols);
sudo_lbuf_append(&def_buf, _("Matching Defaults entries for %s on %s:\n"),
pw->pw_name, user_srunhost);
count = 0;
TAILQ_FOREACH(nss, snl, entries) {
n = display_defaults(nss->parse_tree, pw, &def_buf);
if (n == -1)
goto bad;
count += n;
}
if (count != 0) {
sudo_lbuf_append(&def_buf, "\n\n");
} else {
/* Undo Defaults header. */
def_buf.len = 0;
}
/* Display Runas and Cmnd-specific defaults. */
olen = def_buf.len;
sudo_lbuf_append(&def_buf, _("Runas and Command-specific defaults for %s:\n"),
pw->pw_name);
count = 0;
TAILQ_FOREACH(nss, snl, entries) {
n = display_bound_defaults(nss->parse_tree, pw, &def_buf);
if (n == -1)
goto bad;
count += n;
}
if (count != 0) {
sudo_lbuf_append(&def_buf, "\n\n");
} else {
/* Undo Defaults header. */
def_buf.len = olen;
}
/* Display privileges from all sources. */
sudo_lbuf_append(&priv_buf,
_("User %s may run the following commands on %s:\n"),
pw->pw_name, user_srunhost);
count = 0;
TAILQ_FOREACH(nss, snl, entries) {
if (nss->query(nss, pw) != -1) {
n = sudo_display_userspecs(nss->parse_tree, pw, &priv_buf, verbose);
if (n == -1)
goto bad;
count += n;
}
}
if (count == 0) {
def_buf.len = 0;
priv_buf.len = 0;
sudo_lbuf_append(&priv_buf,
_("User %s is not allowed to run sudo on %s.\n"),
pw->pw_name, user_shost);
}
if (sudo_lbuf_error(&def_buf) || sudo_lbuf_error(&priv_buf))
goto bad;
sudo_lbuf_print(&def_buf);
sudo_lbuf_print(&priv_buf);
sudo_lbuf_destroy(&def_buf);
sudo_lbuf_destroy(&priv_buf);
debug_return_int(true);
bad:
sudo_lbuf_destroy(&def_buf);
sudo_lbuf_destroy(&priv_buf);
debug_return_int(-1);
}
static int
display_cmnd_check(struct sudoers_parse_tree *parse_tree, struct passwd *pw,
time_t now)
{
int host_match, runas_match, cmnd_match;
struct cmndspec *cs;
struct privilege *priv;
struct userspec *us;
debug_decl(display_cmnd_check, SUDOERS_DEBUG_PARSER)
TAILQ_FOREACH_REVERSE(us, &parse_tree->userspecs, userspec_list, entries) {
if (userlist_matches(parse_tree, pw, &us->users) != ALLOW)
continue;
TAILQ_FOREACH_REVERSE(priv, &us->privileges, privilege_list, entries) {
host_match = hostlist_matches(parse_tree, pw, &priv->hostlist);
if (host_match != ALLOW)
continue;
TAILQ_FOREACH_REVERSE(cs, &priv->cmndlist, cmndspec_list, entries) {
if (cs->notbefore != UNSPEC) {
if (now < cs->notbefore)
continue;
}
if (cs->notafter != UNSPEC) {
if (now > cs->notafter)
continue;
}
runas_match = runaslist_matches(parse_tree, cs->runasuserlist,
cs->runasgrouplist, NULL, NULL);
if (runas_match == ALLOW) {
cmnd_match = cmnd_matches(parse_tree, cs->cmnd);
if (cmnd_match != UNSPEC)
debug_return_int(cmnd_match);
}
}
}
}
debug_return_int(UNSPEC);
}
/*
* Check user_cmnd against sudoers and print the matching entry if the
* command is allowed.
* Returns true if the command is allowed, false if not or -1 on error.
*/
int
display_cmnd(struct sudo_nss_list *snl, struct passwd *pw)
{
struct sudo_nss *nss;
int m, match = UNSPEC;
int ret = false;
time_t now;
debug_decl(display_cmnd, SUDOERS_DEBUG_PARSER)
/* Iterate over each source, checking for the command. */
time(&now);
TAILQ_FOREACH(nss, snl, entries) {
if (nss->query(nss, pw) == -1) {
/* The query function should have printed an error message. */
debug_return_int(-1);
}
m = display_cmnd_check(nss->parse_tree, pw, now);
if (m != UNSPEC)
match = m;
if (!sudo_nss_can_continue(nss, m))
break;
}
if (match == ALLOW) {
const int len = sudo_printf(SUDO_CONV_INFO_MSG, "%s%s%s\n",
safe_cmnd, user_args ? " " : "", user_args ? user_args : "");
ret = len < 0 ? -1 : true;
}
debug_return_int(ret);
}
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