diff options
Diffstat (limited to 'plugins/sudoers/policy.c')
| -rw-r--r-- | plugins/sudoers/policy.c | 997 |
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 +}; |