Adding upstream version 1.8.27.upstream/1.8.27upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 997 insertions, 0 deletions

diff --git a/plugins/sudoers/policy.c b/plugins/sudoers/policy.c
new file mode 100644
index 0000000..09cf401
--- /dev/null
+++ b/plugins/sudoers/policy.c
@@ -0,0 +1,997 @@
+/*
+ * Copyright (c) 2010-2017 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.
+ */
+
+/*
+ * This is an open source non-commercial project. Dear PVS-Studio, please check it.
+ * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
+ */
+
+#include <config.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <netinet/in.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 <errno.h>
+#include <grp.h>
+#include <pwd.h>
+
+#include "sudoers.h"
+#include "sudoers_version.h"
+#include "interfaces.h"
+
+/*
+ * Info passed in from the sudo front-end.
+ */
+struct sudoers_policy_open_info {
+    char * const *settings;
+    char * const *user_info;
+    char * const *plugin_args;
+};
+
+/*
+ * Command execution args to be filled in: argv, envp and command info.
+ */
+struct sudoers_exec_args {
+    char ***argv;
+    char ***envp;
+    char ***info;
+};
+
+static unsigned int sudo_version;
+static const char *interfaces_string;
+sudo_conv_t sudo_conv;
+sudo_printf_t sudo_printf;
+const char *path_ldap_conf = _PATH_LDAP_CONF;
+const char *path_ldap_secret = _PATH_LDAP_SECRET;
+
+extern __dso_public struct policy_plugin sudoers_policy;
+
+#ifdef HAVE_BSD_AUTH_H
+extern char *login_style;
+#endif /* HAVE_BSD_AUTH_H */
+
+static int
+parse_bool(const char *line, int varlen, int *flags, int fval)
+{
+    debug_decl(parse_bool, SUDOERS_DEBUG_PLUGIN)
+
+    switch (sudo_strtobool(line + varlen + 1)) {
+    case true:
+	SET(*flags, fval);
+	debug_return_int(true);
+    case false:
+	CLR(*flags, fval);
+	debug_return_int(false);
+    default:
+	sudo_warn(U_("invalid %.*s set by sudo front-end"),
+	    varlen, line);
+	debug_return_int(-1);
+    }
+}
+
+/*
+ * Deserialize args, settings and user_info arrays.
+ * Fills in struct sudo_user and other common sudoers state.
+ */
+int
+sudoers_policy_deserialize_info(void *v, char **runas_user, char **runas_group)
+{
+    struct sudoers_policy_open_info *info = v;
+    char * const *cur;
+    const char *p, *errstr, *groups = NULL;
+    const char *remhost = NULL;
+    bool uid_set = false, gid_set = false;
+    int flags = 0;
+    debug_decl(sudoers_policy_deserialize_info, SUDOERS_DEBUG_PLUGIN)
+
+#define MATCHES(s, v)	\
+    (strncmp((s), (v), sizeof(v) - 1) == 0)
+
+#define CHECK(s, v) do {	\
+    if ((s)[sizeof(v) - 1] == '\0') { \
+	sudo_warn(U_("invalid %.*s set by sudo front-end"), \
+	    (int)(sizeof(v) - 2), v); \
+	goto bad; \
+    } \
+} while (0)
+
+    /* Parse sudo.conf plugin args. */
+    if (info->plugin_args != NULL) {
+	for (cur = info->plugin_args; *cur != NULL; cur++) {
+	    if (MATCHES(*cur, "sudoers_file=")) {
+		CHECK(*cur, "sudoers_file=");
+		sudoers_file = *cur + sizeof("sudoers_file=") - 1;
+		continue;
+	    }
+	    if (MATCHES(*cur, "sudoers_uid=")) {
+		p = *cur + sizeof("sudoers_uid=") - 1;
+		sudoers_uid = (uid_t) sudo_strtoid(p, NULL, NULL, &errstr);
+		if (errstr != NULL) {
+		    sudo_warnx(U_("%s: %s"), *cur, U_(errstr));
+		    goto bad;
+		}
+		continue;
+	    }
+	    if (MATCHES(*cur, "sudoers_gid=")) {
+		p = *cur + sizeof("sudoers_gid=") - 1;
+		sudoers_gid = (gid_t) sudo_strtoid(p, NULL, NULL, &errstr);
+		if (errstr != NULL) {
+		    sudo_warnx(U_("%s: %s"), *cur, U_(errstr));
+		    goto bad;
+		}
+		continue;
+	    }
+	    if (MATCHES(*cur, "sudoers_mode=")) {
+		p = *cur + sizeof("sudoers_mode=") - 1;
+		sudoers_mode = sudo_strtomode(p, &errstr);
+		if (errstr != NULL) {
+		    sudo_warnx(U_("%s: %s"), *cur, U_(errstr));
+		    goto bad;
+		}
+		continue;
+	    }
+	    if (MATCHES(*cur, "ldap_conf=")) {
+		CHECK(*cur, "ldap_conf=");
+		path_ldap_conf = *cur + sizeof("ldap_conf=") - 1;
+		continue;
+	    }
+	    if (MATCHES(*cur, "ldap_secret=")) {
+		CHECK(*cur, "ldap_secret=");
+		path_ldap_secret = *cur + sizeof("ldap_secret=") - 1;
+		continue;
+	    }
+	}
+    }
+
+    /* Parse command line settings. */
+    user_closefrom = -1;
+    for (cur = info->settings; *cur != NULL; cur++) {
+	if (MATCHES(*cur, "closefrom=")) {
+	    errno = 0;
+	    p = *cur + sizeof("closefrom=") - 1;
+	    user_closefrom = strtonum(p, 4, INT_MAX, &errstr);
+	    if (user_closefrom == 0) {
+		sudo_warnx(U_("%s: %s"), *cur, U_(errstr));
+		goto bad;
+	    }
+	    continue;
+	}
+	if (MATCHES(*cur, "runas_user=")) {
+	    CHECK(*cur, "runas_user=");
+	    *runas_user = *cur + sizeof("runas_user=") - 1;
+	    sudo_user.flags |= RUNAS_USER_SPECIFIED;
+	    continue;
+	}
+	if (MATCHES(*cur, "runas_group=")) {
+	    CHECK(*cur, "runas_group=");
+	    *runas_group = *cur + sizeof("runas_group=") - 1;
+	    sudo_user.flags |= RUNAS_GROUP_SPECIFIED;
+	    continue;
+	}
+	if (MATCHES(*cur, "prompt=")) {
+	    /* Allow epmpty prompt. */
+	    user_prompt = *cur + sizeof("prompt=") - 1;
+	    def_passprompt_override = true;
+	    continue;
+	}
+	if (MATCHES(*cur, "set_home=")) {
+	    if (parse_bool(*cur, sizeof("set_home") - 1, &flags,
+		MODE_RESET_HOME) == -1)
+		goto bad;
+	    continue;
+	}
+	if (MATCHES(*cur, "preserve_environment=")) {
+	    if (parse_bool(*cur, sizeof("preserve_environment") - 1, &flags,
+		MODE_PRESERVE_ENV) == -1)
+		goto bad;
+	    continue;
+	}
+	if (MATCHES(*cur, "run_shell=")) {
+	    if (parse_bool(*cur, sizeof("run_shell") -1, &flags,
+		MODE_SHELL) == -1)
+		goto bad;
+	    continue;
+	}
+	if (MATCHES(*cur, "login_shell=")) {
+	    if (parse_bool(*cur, sizeof("login_shell") - 1, &flags,
+		MODE_LOGIN_SHELL) == -1)
+		goto bad;
+	    continue;
+	}
+	if (MATCHES(*cur, "implied_shell=")) {
+	    if (parse_bool(*cur, sizeof("implied_shell") - 1, &flags,
+		MODE_IMPLIED_SHELL) == -1)
+		goto bad;
+	    continue;
+	}
+	if (MATCHES(*cur, "preserve_groups=")) {
+	    if (parse_bool(*cur, sizeof("preserve_groups") - 1, &flags,
+		MODE_PRESERVE_GROUPS) == -1)
+		goto bad;
+	    continue;
+	}
+	if (MATCHES(*cur, "ignore_ticket=")) {
+	    if (parse_bool(*cur, sizeof("ignore_ticket") -1, &flags,
+		MODE_IGNORE_TICKET) == -1)
+		goto bad;
+	    continue;
+	}
+	if (MATCHES(*cur, "noninteractive=")) {
+	    if (parse_bool(*cur, sizeof("noninteractive") - 1, &flags,
+		MODE_NONINTERACTIVE) == -1)
+		goto bad;
+	    continue;
+	}
+	if (MATCHES(*cur, "sudoedit=")) {
+	    if (parse_bool(*cur, sizeof("sudoedit") - 1, &flags,
+		MODE_EDIT) == -1)
+		goto bad;
+	    continue;
+	}
+	if (MATCHES(*cur, "login_class=")) {
+	    CHECK(*cur, "login_class=");
+	    login_class = *cur + sizeof("login_class=") - 1;
+	    def_use_loginclass = true;
+	    continue;
+	}
+#ifdef HAVE_PRIV_SET
+	if (MATCHES(*cur, "runas_privs=")) {
+	    CHECK(*cur, "runas_privs=");
+	    def_privs = *cur + sizeof("runas_privs=") - 1;
+	    continue;
+	}
+	if (MATCHES(*cur, "runas_limitprivs=")) {
+	    CHECK(*cur, "runas_limitprivs=");
+	    def_limitprivs = *cur + sizeof("runas_limitprivs=") - 1;
+	    continue;
+	}
+#endif /* HAVE_PRIV_SET */
+#ifdef HAVE_SELINUX
+	if (MATCHES(*cur, "selinux_role=")) {
+	    CHECK(*cur, "selinux_role=");
+	    user_role = *cur + sizeof("selinux_role=") - 1;
+	    continue;
+	}
+	if (MATCHES(*cur, "selinux_type=")) {
+	    CHECK(*cur, "selinux_type=");
+	    user_type = *cur + sizeof("selinux_type=") - 1;
+	    continue;
+	}
+#endif /* HAVE_SELINUX */
+#ifdef HAVE_BSD_AUTH_H
+	if (MATCHES(*cur, "bsdauth_type=")) {
+	    CHECK(*cur, "login_style=");
+	    login_style = *cur + sizeof("bsdauth_type=") - 1;
+	    continue;
+	}
+#endif /* HAVE_BSD_AUTH_H */
+	if (MATCHES(*cur, "network_addrs=")) {
+	    interfaces_string = *cur + sizeof("network_addrs=") - 1;
+	    if (!set_interfaces(interfaces_string)) {
+		sudo_warn(U_("unable to parse network address list"));
+		goto bad;
+	    }
+	    continue;
+	}
+	if (MATCHES(*cur, "max_groups=")) {
+	    errno = 0;
+	    p = *cur + sizeof("max_groups=") - 1;
+	    sudo_user.max_groups = strtonum(p, 1, INT_MAX, &errstr);
+	    if (sudo_user.max_groups == 0) {
+		sudo_warnx(U_("%s: %s"), *cur, U_(errstr));
+		goto bad;
+	    }
+	    continue;
+	}
+	if (MATCHES(*cur, "remote_host=")) {
+	    CHECK(*cur, "remote_host=");
+	    remhost = *cur + sizeof("remote_host=") - 1;
+	    continue;
+	}
+	if (MATCHES(*cur, "timeout=")) {
+	    p = *cur + sizeof("timeout=") - 1;
+	    user_timeout = parse_timeout(p);
+	    if (user_timeout == -1) {
+		if (errno == ERANGE)
+		    sudo_warnx(U_("%s: %s"), p, U_("timeout value too large"));
+		else
+		    sudo_warnx(U_("%s: %s"), p, U_("invalid timeout value"));
+		goto bad;
+	    }
+	    continue;
+	}
+#ifdef ENABLE_SUDO_PLUGIN_API
+	if (MATCHES(*cur, "plugin_dir=")) {
+	    CHECK(*cur, "plugin_dir=");
+	    path_plugin_dir = *cur + sizeof("plugin_dir=") - 1;
+	    continue;
+	}
+#endif
+    }
+
+    user_umask = (mode_t)-1;
+    for (cur = info->user_info; *cur != NULL; cur++) {
+	if (MATCHES(*cur, "user=")) {
+	    CHECK(*cur, "user=");
+	    if ((user_name = strdup(*cur + sizeof("user=") - 1)) == NULL)
+		goto oom;
+	    continue;
+	}
+	if (MATCHES(*cur, "uid=")) {
+	    p = *cur + sizeof("uid=") - 1;
+	    user_uid = (uid_t) sudo_strtoid(p, NULL, NULL, &errstr);
+	    if (errstr != NULL) {
+		sudo_warnx(U_("%s: %s"), *cur, U_(errstr));
+		goto bad;
+	    }
+	    uid_set = true;
+	    continue;
+	}
+	if (MATCHES(*cur, "gid=")) {
+	    p = *cur + sizeof("gid=") - 1;
+	    user_gid = (gid_t) sudo_strtoid(p, NULL, NULL, &errstr);
+	    if (errstr != NULL) {
+		sudo_warnx(U_("%s: %s"), *cur, U_(errstr));
+		goto bad;
+	    }
+	    gid_set = true;
+	    continue;
+	}
+	if (MATCHES(*cur, "groups=")) {
+	    CHECK(*cur, "groups=");
+	    groups = *cur + sizeof("groups=") - 1;
+	    continue;
+	}
+	if (MATCHES(*cur, "cwd=")) {
+	    CHECK(*cur, "cwd=");
+	    if ((user_cwd = strdup(*cur + sizeof("cwd=") - 1)) == NULL)
+		goto oom;
+	    continue;
+	}
+	if (MATCHES(*cur, "tty=")) {
+	    CHECK(*cur, "tty=");
+	    if ((user_ttypath = strdup(*cur + sizeof("tty=") - 1)) == NULL)
+		goto oom;
+	    user_tty = user_ttypath;
+	    if (strncmp(user_tty, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
+		user_tty += sizeof(_PATH_DEV) - 1;
+	    continue;
+	}
+	if (MATCHES(*cur, "host=")) {
+	    CHECK(*cur, "host=");
+	    if ((user_host = strdup(*cur + sizeof("host=") - 1)) == NULL)
+		goto oom;
+	    if ((p = strchr(user_host, '.')) != NULL) {
+		user_shost = strndup(user_host, (size_t)(p - user_host));
+		if (user_shost == NULL)
+		    goto oom;
+	    } else {
+		user_shost = user_host;
+	    }
+	    continue;
+	}
+	if (MATCHES(*cur, "lines=")) {
+	    errno = 0;
+	    p = *cur + sizeof("lines=") - 1;
+	    sudo_user.lines = strtonum(p, 1, INT_MAX, &errstr);
+	    if (sudo_user.lines == 0) {
+		sudo_warnx(U_("%s: %s"), *cur, U_(errstr));
+		goto bad;
+	    }
+	    continue;
+	}
+	if (MATCHES(*cur, "cols=")) {
+	    errno = 0;
+	    p = *cur + sizeof("cols=") - 1;
+	    sudo_user.cols = strtonum(p, 1, INT_MAX, &errstr);
+	    if (sudo_user.cols == 0) {
+		sudo_warnx(U_("%s: %s"), *cur, U_(errstr));
+		goto bad;
+	    }
+	    continue;
+	}
+	if (MATCHES(*cur, "sid=")) {
+	    p = *cur + sizeof("sid=") - 1;
+	    user_sid = (pid_t) sudo_strtoid(p, NULL, NULL, &errstr);
+	    if (errstr != NULL) {
+		sudo_warnx(U_("%s: %s"), *cur, U_(errstr));
+		goto bad;
+	    }
+	    continue;
+	}
+	if (MATCHES(*cur, "umask=")) {
+	    p = *cur + sizeof("umask=") - 1;
+	    sudo_user.umask = sudo_strtomode(p, &errstr);
+	    if (errstr != NULL) {
+		sudo_warnx(U_("%s: %s"), *cur, U_(errstr));
+		goto bad;
+	    }
+	    continue;
+	}
+    }
+
+    /* User name, user ID, group ID and host name must be specified. */
+    if (user_name == NULL) {
+	sudo_warnx(U_("user name not set by sudo front-end"));
+	goto bad;
+    }
+    if (!uid_set) {
+	sudo_warnx(U_("user ID not set by sudo front-end"));
+	goto bad;
+    }
+    if (!gid_set) {
+	sudo_warnx(U_("group ID not set by sudo front-end"));
+	goto bad;
+    }
+    if (user_host == NULL) {
+	sudo_warnx(U_("host name not set by sudo front-end"));
+	goto bad;
+    }
+
+    if ((user_runhost = strdup(remhost ? remhost : user_host)) == NULL)
+	goto oom;
+    if ((p = strchr(user_runhost, '.')) != NULL) {
+	user_srunhost = strndup(user_runhost, (size_t)(p - user_runhost));
+	if (user_srunhost == NULL)
+	    goto oom;
+    } else {
+	user_srunhost = user_runhost;
+    }
+    if (user_cwd == NULL) {
+	if ((user_cwd = strdup("unknown")) == NULL)
+	    goto oom;
+    }
+    if (user_tty == NULL) {
+	if ((user_tty = strdup("unknown")) == NULL)
+	    goto oom;
+	/* user_ttypath remains NULL */
+    }
+
+    if (groups != NULL) {
+	/* sudo_parse_gids() will print a warning on error. */
+	user_ngids = sudo_parse_gids(groups, &user_gid, &user_gids);
+	if (user_ngids == -1)
+	    goto bad;
+    }
+
+    /* umask is only set in user_info[] for API 1.10 and above. */
+    if (user_umask == (mode_t)-1) {
+	user_umask = umask(0);
+	umask(user_umask);
+    }
+
+    /* Always reset the environment for a login shell. */
+    if (ISSET(flags, MODE_LOGIN_SHELL))
+	def_env_reset = true;
+
+    /* Some systems support fexecve() which we use for digest matches. */
+    cmnd_fd = -1;
+
+    /* Dump settings and user info (XXX - plugin args) */
+    for (cur = info->settings; *cur != NULL; cur++)
+	sudo_debug_printf(SUDO_DEBUG_INFO, "settings: %s", *cur);
+    for (cur = info->user_info; *cur != NULL; cur++)
+	sudo_debug_printf(SUDO_DEBUG_INFO, "user_info: %s", *cur);
+
+#undef MATCHES
+    debug_return_int(flags);
+
+oom:
+    sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
+bad:
+    debug_return_int(MODE_ERROR);
+}
+
+/*
+ * Setup the execution environment.
+ * Builds up the command_info list and sets argv and envp.
+ * Consumes iolog_path if not NULL.
+ * Returns 1 on success and -1 on error.
+ */
+int
+sudoers_policy_exec_setup(char *argv[], char *envp[], mode_t cmnd_umask,
+    char *iolog_path, void *v)
+{
+    struct sudoers_exec_args *exec_args = v;
+    char **command_info;
+    int info_len = 0;
+    debug_decl(sudoers_policy_exec_setup, SUDOERS_DEBUG_PLUGIN)
+
+    /* Increase the length of command_info as needed, it is *not* checked. */
+    command_info = calloc(48, sizeof(char *));
+    if (command_info == NULL)
+	goto oom;
+
+    command_info[info_len] = sudo_new_key_val("command", safe_cmnd);
+    if (command_info[info_len++] == NULL)
+	goto oom;
+    if (def_log_input || def_log_output) {
+	if (iolog_path)
+	    command_info[info_len++] = iolog_path;	/* now owned */
+	if (def_log_input) {
+	    if ((command_info[info_len++] = strdup("iolog_stdin=true")) == NULL)
+		goto oom;
+	    if ((command_info[info_len++] = strdup("iolog_ttyin=true")) == NULL)
+		goto oom;
+	}
+	if (def_log_output) {
+	    if ((command_info[info_len++] = strdup("iolog_stdout=true")) == NULL)
+		goto oom;
+	    if ((command_info[info_len++] = strdup("iolog_stderr=true")) == NULL)
+		goto oom;
+	    if ((command_info[info_len++] = strdup("iolog_ttyout=true")) == NULL)
+		goto oom;
+	}
+	if (def_compress_io) {
+	    if ((command_info[info_len++] = strdup("iolog_compress=true")) == NULL)
+		goto oom;
+	}
+	if (def_maxseq) {
+	    if (asprintf(&command_info[info_len++], "maxseq=%u", def_maxseq) == -1)
+		goto oom;
+	}
+    }
+    if (ISSET(sudo_mode, MODE_EDIT)) {
+	if ((command_info[info_len++] = strdup("sudoedit=true")) == NULL)
+	    goto oom;
+	if (!def_sudoedit_checkdir) {
+	    if ((command_info[info_len++] = strdup("sudoedit_checkdir=false")) == NULL)
+		goto oom;
+	}
+	if (def_sudoedit_follow) {
+	    if ((command_info[info_len++] = strdup("sudoedit_follow=true")) == NULL)
+		goto oom;
+	}
+    }
+    if (ISSET(sudo_mode, MODE_LOGIN_SHELL)) {
+	/* Set cwd to run user's homedir. */
+	if ((command_info[info_len++] = sudo_new_key_val("cwd", runas_pw->pw_dir)) == NULL)
+	    goto oom;
+    }
+    if (def_stay_setuid) {
+	if (asprintf(&command_info[info_len++], "runas_uid=%u",
+	    (unsigned int)user_uid) == -1)
+	    goto oom;
+	if (asprintf(&command_info[info_len++], "runas_gid=%u",
+	    (unsigned int)user_gid) == -1)
+	    goto oom;
+	if (asprintf(&command_info[info_len++], "runas_euid=%u",
+	    (unsigned int)runas_pw->pw_uid) == -1)
+	    goto oom;
+	if (asprintf(&command_info[info_len++], "runas_egid=%u",
+	    runas_gr ? (unsigned int)runas_gr->gr_gid :
+	    (unsigned int)runas_pw->pw_gid) == -1)
+	    goto oom;
+    } else {
+	if (asprintf(&command_info[info_len++], "runas_uid=%u",
+	    (unsigned int)runas_pw->pw_uid) == -1)
+	    goto oom;
+	if (asprintf(&command_info[info_len++], "runas_gid=%u",
+	    runas_gr ? (unsigned int)runas_gr->gr_gid :
+	    (unsigned int)runas_pw->pw_gid) == -1)
+	    goto oom;
+    }
+    if (def_preserve_groups) {
+	if ((command_info[info_len++] = strdup("preserve_groups=true")) == NULL)
+	    goto oom;
+    } else {
+	int i, len;
+	gid_t egid;
+	size_t glsize;
+	char *cp, *gid_list;
+	struct gid_list *gidlist;
+
+	/* Only use results from a group db query, not the front end. */
+	gidlist = sudo_get_gidlist(runas_pw, ENTRY_TYPE_QUERIED);
+
+	/* We reserve an extra spot in the list for the effective gid. */
+	glsize = sizeof("runas_groups=") - 1 +
+	    ((gidlist->ngids + 1) * (MAX_UID_T_LEN + 1));
+	gid_list = malloc(glsize);
+	if (gid_list == NULL)
+	    goto oom;
+	memcpy(gid_list, "runas_groups=", sizeof("runas_groups=") - 1);
+	cp = gid_list + sizeof("runas_groups=") - 1;
+
+	/* On BSD systems the effective gid is the first group in the list. */
+	egid = runas_gr ? (unsigned int)runas_gr->gr_gid :
+	    (unsigned int)runas_pw->pw_gid;
+	len = snprintf(cp, glsize - (cp - gid_list), "%u", (unsigned int)egid);
+	if (len < 0 || (size_t)len >= glsize - (cp - gid_list)) {
+	    sudo_warnx(U_("internal error, %s overflow"), __func__);
+	    free(gid_list);
+	    goto bad;
+	}
+	cp += len;
+	for (i = 0; i < gidlist->ngids; i++) {
+	    if (gidlist->gids[i] != egid) {
+		len = snprintf(cp, glsize - (cp - gid_list), ",%u",
+		     (unsigned int) gidlist->gids[i]);
+		if (len < 0 || (size_t)len >= glsize - (cp - gid_list)) {
+		    sudo_warnx(U_("internal error, %s overflow"), __func__);
+		    free(gid_list);
+		    goto bad;
+		}
+		cp += len;
+	    }
+	}
+	command_info[info_len++] = gid_list;
+	sudo_gidlist_delref(gidlist);
+    }
+    if (def_closefrom >= 0) {
+	if (asprintf(&command_info[info_len++], "closefrom=%d", def_closefrom) == -1)
+	    goto oom;
+    }
+    if (def_ignore_iolog_errors) {
+	if ((command_info[info_len++] = strdup("ignore_iolog_errors=true")) == NULL)
+	    goto oom;
+    }
+    if (def_noexec) {
+	if ((command_info[info_len++] = strdup("noexec=true")) == NULL)
+	    goto oom;
+    }
+    if (def_exec_background) {
+	if ((command_info[info_len++] = strdup("exec_background=true")) == NULL)
+	    goto oom;
+    }
+    if (def_set_utmp) {
+	if ((command_info[info_len++] = strdup("set_utmp=true")) == NULL)
+	    goto oom;
+    }
+    if (def_use_pty) {
+	if ((command_info[info_len++] = strdup("use_pty=true")) == NULL)
+	    goto oom;
+    }
+    if (def_utmp_runas) {
+	if ((command_info[info_len++] = sudo_new_key_val("utmp_user", runas_pw->pw_name)) == NULL)
+	    goto oom;
+    }
+    if (def_iolog_mode != (S_IRUSR|S_IWUSR)) {
+	if (asprintf(&command_info[info_len++], "iolog_mode=0%o", (unsigned int)def_iolog_mode) == -1)
+	    goto oom;
+    }
+    if (def_iolog_user != NULL) {
+	if ((command_info[info_len++] = sudo_new_key_val("iolog_user", def_iolog_user)) == NULL)
+	    goto oom;
+    }
+    if (def_iolog_group != NULL) {
+	if ((command_info[info_len++] = sudo_new_key_val("iolog_group", def_iolog_group)) == NULL)
+	    goto oom;
+    }
+    if (def_command_timeout > 0 || user_timeout > 0) {
+	int timeout = user_timeout;
+	if (timeout == 0 || def_command_timeout < timeout)
+	    timeout = def_command_timeout;
+	if (asprintf(&command_info[info_len++], "timeout=%u", timeout) == -1)
+	    goto oom;
+    }
+    if (cmnd_umask != ACCESSPERMS) {
+	if (asprintf(&command_info[info_len++], "umask=0%o", (unsigned int)cmnd_umask) == -1)
+	    goto oom;
+    }
+    if (cmnd_fd != -1) {
+	if (sudo_version < SUDO_API_MKVERSION(1, 9)) {
+	    /* execfd only supported by plugin API 1.9 and higher */
+	    close(cmnd_fd);
+	    cmnd_fd = -1;
+	} else {
+	    if (asprintf(&command_info[info_len++], "execfd=%d", cmnd_fd) == -1)
+		goto oom;
+	}
+    }
+#ifdef HAVE_LOGIN_CAP_H
+    if (def_use_loginclass) {
+	if ((command_info[info_len++] = sudo_new_key_val("login_class", login_class)) == NULL)
+	    goto oom;
+    }
+#endif /* HAVE_LOGIN_CAP_H */
+#ifdef HAVE_SELINUX
+    if (user_role != NULL) {
+	if ((command_info[info_len++] = sudo_new_key_val("selinux_role", user_role)) == NULL)
+	    goto oom;
+    }
+    if (user_type != NULL) {
+	if ((command_info[info_len++] = sudo_new_key_val("selinux_type", user_type)) == NULL)
+	    goto oom;
+    }
+#endif /* HAVE_SELINUX */
+#ifdef HAVE_PRIV_SET
+    if (runas_privs != NULL) {
+	if ((command_info[info_len++] = sudo_new_key_val("runas_privs", runas_privs)) == NULL)
+	    goto oom;
+    }
+    if (runas_limitprivs != NULL) {
+	if ((command_info[info_len++] = sudo_new_key_val("runas_limitprivs", runas_limitprivs)) == NULL)
+	    goto oom;
+    }
+#endif /* HAVE_SELINUX */
+
+    /* Free on exit; they are not available in the close function. */
+    sudoers_gc_add(GC_VECTOR, argv);
+    sudoers_gc_add(GC_VECTOR, envp);
+    sudoers_gc_add(GC_VECTOR, command_info);
+
+    /* Fill in exec environment info. */
+    *(exec_args->argv) = argv;
+    *(exec_args->envp) = envp;
+    *(exec_args->info) = command_info;
+
+    debug_return_int(true);
+
+oom:
+    sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
+bad:
+    while (info_len--)
+	free(command_info[info_len]);
+    free(command_info);
+    debug_return_int(-1);
+}
+
+static int
+sudoers_policy_open(unsigned int version, sudo_conv_t conversation,
+    sudo_printf_t plugin_printf, char * const settings[],
+    char * const user_info[], char * const envp[], char * const args[])
+{
+    struct sudo_conf_debug_file_list debug_files = TAILQ_HEAD_INITIALIZER(debug_files);
+    struct sudoers_policy_open_info info;
+    const char *cp, *plugin_path = NULL;
+    char * const *cur;
+    debug_decl(sudoers_policy_open, SUDOERS_DEBUG_PLUGIN)
+
+    sudo_version = version;
+    sudo_conv = conversation;
+    sudo_printf = plugin_printf;
+
+    /* Plugin args are only specified for API version 1.2 and higher. */
+    if (sudo_version < SUDO_API_MKVERSION(1, 2))
+	args = NULL;
+
+    /* Initialize the debug subsystem.  */
+    for (cur = settings; (cp = *cur) != NULL; cur++) {
+	if (strncmp(cp, "debug_flags=", sizeof("debug_flags=") - 1) == 0) {
+	    cp += sizeof("debug_flags=") - 1;
+	    if (!sudoers_debug_parse_flags(&debug_files, cp))
+		debug_return_int(-1);
+	    continue;
+	}
+	if (strncmp(cp, "plugin_path=", sizeof("plugin_path=") - 1) == 0) {
+	    plugin_path = cp + sizeof("plugin_path=") - 1;
+	    continue;
+	}
+    }
+    if (!sudoers_debug_register(plugin_path, &debug_files))
+	debug_return_int(-1);
+
+    /* Call the sudoers init function. */
+    info.settings = settings;
+    info.user_info = user_info;
+    info.plugin_args = args;
+    debug_return_int(sudoers_policy_init(&info, envp));
+}
+
+static void
+sudoers_policy_close(int exit_status, int error_code)
+{
+    debug_decl(sudoers_policy_close, SUDOERS_DEBUG_PLUGIN)
+
+    /* We do not currently log the exit status. */
+    if (error_code) {
+	errno = error_code;
+	sudo_warn(U_("unable to execute %s"), safe_cmnd);
+    }
+
+    /* Close the session we opened in sudoers_policy_init_session(). */
+    if (ISSET(sudo_mode, MODE_RUN|MODE_EDIT))
+	(void)sudo_auth_end_session(runas_pw);
+
+    /* Deregister the callback for sudo_fatal()/sudo_fatalx(). */
+    sudo_fatal_callback_deregister(sudoers_cleanup);
+
+    /* Free remaining references to password and group entries. */
+    /* XXX - move cleanup to function in sudoers.c */
+    sudo_pw_delref(sudo_user.pw);
+    sudo_user.pw = NULL;
+    sudo_pw_delref(runas_pw);
+    runas_pw = NULL;
+    if (runas_gr != NULL) {
+	sudo_gr_delref(runas_gr);
+	runas_gr = NULL;
+    }
+    if (user_gid_list != NULL) {
+	sudo_gidlist_delref(user_gid_list);
+	user_gid_list = NULL;
+    }
+    free(user_gids);
+    user_gids = NULL;
+
+    sudoers_debug_deregister();
+
+    return;
+}
+
+/*
+ * The init_session function is called before executing the command
+ * and before uid/gid changes occur.
+ * Returns 1 on success, 0 on failure and -1 on error.
+ */
+static int
+sudoers_policy_init_session(struct passwd *pwd, char **user_env[])
+{
+    debug_decl(sudoers_policy_init_session, SUDOERS_DEBUG_PLUGIN)
+
+    /* user_env is only specified for API version 1.2 and higher. */
+    if (sudo_version < SUDO_API_MKVERSION(1, 2))
+	user_env = NULL;
+
+    debug_return_int(sudo_auth_begin_session(pwd, user_env));
+}
+
+static int
+sudoers_policy_check(int argc, char * const argv[], char *env_add[],
+    char **command_infop[], char **argv_out[], char **user_env_out[])
+{
+    struct sudoers_exec_args exec_args;
+    int ret;
+    debug_decl(sudoers_policy_check, SUDOERS_DEBUG_PLUGIN)
+
+    if (!ISSET(sudo_mode, MODE_EDIT))
+	SET(sudo_mode, MODE_RUN);
+
+    exec_args.argv = argv_out;
+    exec_args.envp = user_env_out;
+    exec_args.info = command_infop;
+
+    ret = sudoers_policy_main(argc, argv, 0, env_add, false, &exec_args);
+    if (ret == true && sudo_version >= SUDO_API_MKVERSION(1, 3)) {
+	/* Unset close function if we don't need it to avoid extra process. */
+	if (!def_log_input && !def_log_output && !def_use_pty &&
+	    !sudo_auth_needs_end_session())
+	    sudoers_policy.close = NULL;
+    }
+    debug_return_int(ret);
+}
+
+static int
+sudoers_policy_validate(void)
+{
+    debug_decl(sudoers_policy_validate, SUDOERS_DEBUG_PLUGIN)
+
+    user_cmnd = "validate";
+    SET(sudo_mode, MODE_VALIDATE);
+
+    debug_return_int(sudoers_policy_main(0, NULL, I_VERIFYPW, NULL, false, NULL));
+}
+
+static void
+sudoers_policy_invalidate(int remove)
+{
+    debug_decl(sudoers_policy_invalidate, SUDOERS_DEBUG_PLUGIN)
+
+    user_cmnd = "kill";
+    /* XXX - plugin API should support a return value for fatal errors. */
+    timestamp_remove(remove);
+    sudoers_cleanup();
+
+    debug_return;
+}
+
+static int
+sudoers_policy_list(int argc, char * const argv[], int verbose,
+    const char *list_user)
+{
+    int ret;
+    debug_decl(sudoers_policy_list, SUDOERS_DEBUG_PLUGIN)
+
+    user_cmnd = "list";
+    if (argc)
+	SET(sudo_mode, MODE_CHECK);
+    else
+	SET(sudo_mode, MODE_LIST);
+    if (list_user) {
+	list_pw = sudo_getpwnam(list_user);
+	if (list_pw == NULL) {
+	    sudo_warnx(U_("unknown user: %s"), list_user);
+	    debug_return_int(-1);
+	}
+    }
+    ret = sudoers_policy_main(argc, argv, I_LISTPW, NULL, verbose, NULL);
+    if (list_user) {
+	sudo_pw_delref(list_pw);
+	list_pw = NULL;
+    }
+
+    debug_return_int(ret);
+}
+
+static int
+sudoers_policy_version(int verbose)
+{
+    debug_decl(sudoers_policy_version, SUDOERS_DEBUG_PLUGIN)
+
+    sudo_printf(SUDO_CONV_INFO_MSG, _("Sudoers policy plugin version %s\n"),
+	PACKAGE_VERSION);
+    sudo_printf(SUDO_CONV_INFO_MSG, _("Sudoers file grammar version %d\n"),
+	SUDOERS_GRAMMAR_VERSION);
+
+    if (verbose) {
+	sudo_printf(SUDO_CONV_INFO_MSG, _("\nSudoers path: %s\n"), sudoers_file);
+#ifdef HAVE_LDAP
+# ifdef _PATH_NSSWITCH_CONF
+	sudo_printf(SUDO_CONV_INFO_MSG, _("nsswitch path: %s\n"), _PATH_NSSWITCH_CONF);
+# endif
+	sudo_printf(SUDO_CONV_INFO_MSG, _("ldap.conf path: %s\n"), path_ldap_conf);
+	sudo_printf(SUDO_CONV_INFO_MSG, _("ldap.secret path: %s\n"), path_ldap_secret);
+#endif
+	dump_auth_methods();
+	dump_defaults();
+	sudo_printf(SUDO_CONV_INFO_MSG, "\n");
+	if (interfaces_string != NULL) {
+	    dump_interfaces(interfaces_string);
+	    sudo_printf(SUDO_CONV_INFO_MSG, "\n");
+	}
+    }
+    debug_return_int(true);
+}
+
+static struct sudo_hook sudoers_hooks[] = {
+    { SUDO_HOOK_VERSION, SUDO_HOOK_SETENV, sudoers_hook_setenv, NULL },
+    { SUDO_HOOK_VERSION, SUDO_HOOK_UNSETENV, sudoers_hook_unsetenv, NULL },
+    { SUDO_HOOK_VERSION, SUDO_HOOK_GETENV, sudoers_hook_getenv, NULL },
+    { SUDO_HOOK_VERSION, SUDO_HOOK_PUTENV, sudoers_hook_putenv, NULL },
+    { 0, 0, NULL, NULL }
+};
+
+/*
+ * Register environment function hooks.
+ * Note that we have not registered sudoers with the debug subsystem yet.
+ */
+static void
+sudoers_policy_register_hooks(int version, int (*register_hook)(struct sudo_hook *hook))
+{
+    struct sudo_hook *hook;
+
+    for (hook = sudoers_hooks; hook->hook_fn != NULL; hook++) {
+	if (register_hook(hook) != 0) {
+	    sudo_warn_nodebug(
+		U_("unable to register hook of type %d (version %d.%d)"),
+		hook->hook_type, SUDO_API_VERSION_GET_MAJOR(hook->hook_version),
+		SUDO_API_VERSION_GET_MINOR(hook->hook_version));
+	}
+    }
+}
+
+__dso_public struct policy_plugin sudoers_policy = {
+    SUDO_POLICY_PLUGIN,
+    SUDO_API_VERSION,
+    sudoers_policy_open,
+    sudoers_policy_close,
+    sudoers_policy_version,
+    sudoers_policy_check,
+    sudoers_policy_list,
+    sudoers_policy_validate,
+    sudoers_policy_invalidate,
+    sudoers_policy_init_session,
+    sudoers_policy_register_hooks
+};