diff options
Diffstat (limited to 'plugins/sudoers/testsudoers.c')
| -rw-r--r-- | plugins/sudoers/testsudoers.c | 621 |
1 files changed, 621 insertions, 0 deletions
diff --git a/plugins/sudoers/testsudoers.c b/plugins/sudoers/testsudoers.c new file mode 100644 index 0000000..3eea349 --- /dev/null +++ b/plugins/sudoers/testsudoers.c @@ -0,0 +1,621 @@ +/* + * SPDX-License-Identifier: ISC + * + * Copyright (c) 1996, 1998-2005, 2007-2022 + * 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. + * + * Sponsored in part by the Defense Advanced Research Projects + * Agency (DARPA) and Air Force Research Laboratory, Air Force + * Materiel Command, USAF, under agreement number F39502-99-1-0512. + */ + +/* + * 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 <arpa/inet.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#ifdef HAVE_STRINGS_H +# include <strings.h> +#endif /* HAVE_STRINGS_H */ +#include <unistd.h> +#include <errno.h> + +#include "tsgetgrpw.h" +#include "sudoers.h" +#include "interfaces.h" +#include "sudo_conf.h" +#include "sudo_lbuf.h" +#include <gram.h> + +#ifndef YYDEBUG +# define YYDEBUG 0 +#endif + +enum sudoers_formats { + format_ldif, + format_sudoers +}; + +/* + * Function Prototypes + */ +static void dump_sudoers(struct sudo_lbuf *lbuf); +static void set_runaspw(const char *); +static void set_runasgr(const char *); +static bool cb_runas_default(const char *file, int line, int column, const union sudo_defs_val *, int); +static int testsudoers_error(const char *msg); +static int testsudoers_output(const char *buf); +sudo_noreturn static void usage(void); + +/* testsudoers_pwutil.c */ +extern struct cache_item *testsudoers_make_gritem(gid_t gid, const char *group); +extern struct cache_item *testsudoers_make_grlist_item(const struct passwd *pw, char * const *groups); +extern struct cache_item *testsudoers_make_gidlist_item(const struct passwd *pw, char * const *gids, unsigned int type); +extern struct cache_item *testsudoers_make_pwitem(uid_t uid, const char *user); + +/* gram.y */ +extern int (*trace_print)(const char *msg); + +/* + * Globals + */ +struct sudo_user sudo_user; +struct passwd *list_pw; +static const char *orig_cmnd; +static char *runas_group, *runas_user; + +#if defined(SUDO_DEVEL) && defined(__OpenBSD__) +extern char *malloc_options; +#endif +#if YYDEBUG +extern int sudoersdebug; +#endif + +sudo_dso_public int main(int argc, char *argv[]); + +int +main(int argc, char *argv[]) +{ + enum sudoers_formats input_format = format_sudoers; + struct cmndspec *cs; + struct privilege *priv; + struct userspec *us; + char *p, *grfile, *pwfile; + const char *errstr; + int match, host_match, runas_match, cmnd_match; + int ch, dflag, exitcode = EXIT_FAILURE; + struct sudo_lbuf lbuf; + debug_decl(main, SUDOERS_DEBUG_MAIN); + +#if defined(SUDO_DEVEL) && defined(__OpenBSD__) + malloc_options = "S"; +#endif +#if YYDEBUG + sudoersdebug = 1; +#endif + + initprogname(argc > 0 ? argv[0] : "testsudoers"); + + if (!sudoers_initlocale(setlocale(LC_ALL, ""), def_sudoers_locale)) + sudo_fatalx(U_("%s: %s"), __func__, U_("unable to allocate memory")); + sudo_warn_set_locale_func(sudoers_warn_setlocale); + bindtextdomain("sudoers", LOCALEDIR); /* XXX - should have own domain */ + textdomain("sudoers"); + + /* No word wrap on output. */ + sudo_lbuf_init(&lbuf, testsudoers_output, 0, NULL, 0); + + /* Initialize the debug subsystem. */ + if (sudo_conf_read(NULL, SUDO_CONF_DEBUG) == -1) + goto done; + if (!sudoers_debug_register(getprogname(), sudo_conf_debug_files(getprogname()))) + goto done; + + dflag = 0; + grfile = pwfile = NULL; + while ((ch = getopt(argc, argv, "+dg:G:h:i:P:p:tu:U:")) != -1) { + switch (ch) { + case 'd': + dflag = 1; + break; + case 'G': + sudoers_gid = (gid_t)sudo_strtoid(optarg, &errstr); + if (errstr != NULL) + sudo_fatalx("group-ID %s: %s", optarg, errstr); + break; + case 'g': + runas_group = optarg; + SET(sudo_user.flags, RUNAS_GROUP_SPECIFIED); + break; + case 'h': + user_host = optarg; + break; + case 'i': + if (strcasecmp(optarg, "ldif") == 0) { + input_format = format_ldif; + } else if (strcasecmp(optarg, "sudoers") == 0) { + input_format = format_sudoers; + } else { + sudo_warnx(U_("unsupported input format %s"), optarg); + usage(); + } + break; + case 'p': + pwfile = optarg; + break; + case 'P': + grfile = optarg; + break; + case 't': + trace_print = testsudoers_error; + break; + case 'U': + sudoers_uid = (uid_t)sudo_strtoid(optarg, &errstr); + if (errstr != NULL) + sudo_fatalx("user-ID %s: %s", optarg, errstr); + break; + case 'u': + runas_user = optarg; + SET(sudo_user.flags, RUNAS_USER_SPECIFIED); + break; + default: + usage(); + break; + } + } + argc -= optind; + argv += optind; + + if (grfile != NULL || pwfile != NULL) { + /* Set group/passwd file and init the cache. */ + if (grfile) + testsudoers_setgrfile(grfile); + if (pwfile) + testsudoers_setpwfile(pwfile); + + /* Use custom passwd/group backend. */ + sudo_pwutil_set_backend(testsudoers_make_pwitem, + testsudoers_make_gritem, testsudoers_make_gidlist_item, + testsudoers_make_grlist_item); + } + + if (argc < 2) { + if (!dflag) + usage(); + user_name = argc ? *argv++ : (char *)"root"; + orig_cmnd = "true"; + argc = 0; + } else { + user_name = *argv++; + orig_cmnd = *argv++; + argc -= 2; + } + user_cmnd = strdup(orig_cmnd); + if (user_cmnd == NULL) + sudo_fatalx(U_("%s: %s"), __func__, U_("unable to allocate memory")); + user_base = sudo_basename(user_cmnd); + + if ((sudo_user.pw = sudo_getpwnam(user_name)) == NULL) + sudo_fatalx(U_("unknown user %s"), user_name); + + if (user_host == NULL) { + if ((user_host = sudo_gethostname()) == NULL) + sudo_fatal("gethostname"); + } + if ((p = strchr(user_host, '.'))) { + *p = '\0'; + if ((user_shost = strdup(user_host)) == NULL) + sudo_fatalx(U_("%s: %s"), __func__, U_("unable to allocate memory")); + *p = '.'; + } else { + user_shost = user_host; + } + user_runhost = user_host; + user_srunhost = user_shost; + + /* Fill in user_args from argv. */ + if (argc > 0) { + char *to, **from; + size_t size, n; + + for (size = 0, from = argv; *from; from++) + size += strlen(*from) + 1; + + if ((user_args = malloc(size)) == NULL) + sudo_fatalx(U_("%s: %s"), __func__, U_("unable to allocate memory")); + for (to = user_args, from = argv; *from; from++) { + n = strlcpy(to, *from, size - (to - user_args)); + if (n >= size - (to - user_args)) + sudo_fatalx(U_("internal error, %s overflow"), getprogname()); + to += n; + *to++ = ' '; + } + *--to = '\0'; + } + + /* Initialize default values. */ + if (!init_defaults()) + sudo_fatalx("%s", U_("unable to initialize sudoers default values")); + + /* Set group_plugin callback. */ + sudo_defs_table[I_GROUP_PLUGIN].callback = cb_group_plugin; + + /* Set runas callback. */ + sudo_defs_table[I_RUNAS_DEFAULT].callback = cb_runas_default; + + /* Set locale callback. */ + sudo_defs_table[I_SUDOERS_LOCALE].callback = sudoers_locale_callback; + + /* Load ip addr/mask for each interface. */ + if (get_net_ifs(&p) > 0) { + if (!set_interfaces(p)) + sudo_fatal("%s", U_("unable to parse network address list")); + } + + /* Allocate space for data structures in the parser. */ + init_parser("sudoers", false, true); + + /* + * Set runas passwd/group entries based on command line or sudoers. + * Note that if runas_group was specified without runas_user we + * run the command as the invoking user. + */ + if (runas_group != NULL) { + set_runasgr(runas_group); + set_runaspw(runas_user ? runas_user : user_name); + } else + set_runaspw(runas_user ? runas_user : def_runas_default); + + /* Parse the policy file. */ + sudoers_setlocale(SUDOERS_LOCALE_SUDOERS, NULL); + switch (input_format) { + case format_ldif: + if (!sudoers_parse_ldif(&parsed_policy, stdin, NULL, true)) { + (void) puts("Parse error in LDIF"); + parse_error = true; + } + break; + case format_sudoers: + if (sudoersparse() != 0) + parse_error = true; + break; + default: + sudo_fatalx("error: unhandled input %d", input_format); + } + if (!update_defaults(&parsed_policy, NULL, SETDEF_ALL, false)) + parse_error = true; + + if (!parse_error) + (void) puts("Parses OK"); + + if (dflag) { + (void) putchar('\n'); + dump_sudoers(&lbuf); + if (argc < 2) { + exitcode = parse_error ? 1 : 0; + goto done; + } + } + + /* This loop must match the one in sudo_file_lookup() */ + printf("\nEntries for user %s:\n", user_name); + match = UNSPEC; + TAILQ_FOREACH_REVERSE(us, &parsed_policy.userspecs, userspec_list, entries) { + if (userlist_matches(&parsed_policy, sudo_user.pw, &us->users) != ALLOW) + continue; + TAILQ_FOREACH_REVERSE(priv, &us->privileges, privilege_list, entries) { + sudo_lbuf_append(&lbuf, "\n"); + sudoers_format_privilege(&lbuf, &parsed_policy, priv, false); + sudo_lbuf_print(&lbuf); + host_match = hostlist_matches(&parsed_policy, sudo_user.pw, + &priv->hostlist); + if (host_match == ALLOW) { + puts("\thost matched"); + TAILQ_FOREACH_REVERSE(cs, &priv->cmndlist, cmndspec_list, entries) { + runas_match = runaslist_matches(&parsed_policy, + cs->runasuserlist, cs->runasgrouplist, NULL, NULL); + if (runas_match == ALLOW) { + puts("\trunas matched"); + cmnd_match = cmnd_matches(&parsed_policy, cs->cmnd, + cs->runchroot, NULL); + if (cmnd_match != UNSPEC) + match = cmnd_match; + printf("\tcmnd %s\n", match == ALLOW ? "allowed" : + match == DENY ? "denied" : "unmatched"); + } + } + } else + puts(U_("\thost unmatched")); + } + } + puts(match == ALLOW ? U_("\nCommand allowed") : + match == DENY ? U_("\nCommand denied") : U_("\nCommand unmatched")); + + /* + * Exit codes: + * 0 - parsed OK and command matched. + * 1 - parse error + * 2 - command not matched + * 3 - command denied + */ + exitcode = parse_error ? 1 : (match == ALLOW ? 0 : match + 3); +done: + sudo_lbuf_destroy(&lbuf); + sudo_freepwcache(); + sudo_freegrcache(); + sudo_debug_exit_int(__func__, __FILE__, __LINE__, sudo_debug_subsys, exitcode); + exit(exitcode); +} + +static void +set_runaspw(const char *user) +{ + struct passwd *pw = NULL; + debug_decl(set_runaspw, SUDOERS_DEBUG_UTIL); + + if (*user == '#') { + const char *errstr; + uid_t uid = sudo_strtoid(user + 1, &errstr); + if (errstr == NULL) { + if ((pw = sudo_getpwuid(uid)) == NULL) + pw = sudo_fakepwnam(user, user_gid); + } + } + if (pw == NULL) { + if ((pw = sudo_getpwnam(user)) == NULL) + sudo_fatalx(U_("unknown user %s"), user); + } + if (runas_pw != NULL) + sudo_pw_delref(runas_pw); + runas_pw = pw; + debug_return; +} + +static void +set_runasgr(const char *group) +{ + struct group *gr = NULL; + debug_decl(set_runasgr, SUDOERS_DEBUG_UTIL); + + if (*group == '#') { + const char *errstr; + gid_t gid = sudo_strtoid(group + 1, &errstr); + if (errstr == NULL) { + if ((gr = sudo_getgrgid(gid)) == NULL) + gr = sudo_fakegrnam(group); + } + } + if (gr == NULL) { + if ((gr = sudo_getgrnam(group)) == NULL) + sudo_fatalx(U_("unknown group %s"), group); + } + if (runas_gr != NULL) + sudo_gr_delref(runas_gr); + runas_gr = gr; + debug_return; +} + +/* + * Callback for runas_default sudoers setting. + */ +static bool +cb_runas_default(const char *file, int line, int column, + const union sudo_defs_val *sd_un, int op) +{ + /* Only reset runaspw if user didn't specify one. */ + if (!runas_user && !runas_group) + set_runaspw(sd_un->str); + return true; +} + +void +sudo_setspent(void) +{ + return; +} + +void +sudo_endspent(void) +{ + return; +} + +FILE * +open_sudoers(const char *file, bool doedit, bool *keepopen) +{ + struct stat sb; + FILE *fp = NULL; + const char *base; + int error, fd; + debug_decl(open_sudoers, SUDOERS_DEBUG_UTIL); + + /* Report errors using the basename for consistent test output. */ + base = sudo_basename(file); + fd = sudo_secure_open_file(file, sudoers_uid, sudoers_gid, &sb, &error); + if (fd != -1) { + if ((fp = fdopen(fd, "r")) == NULL) { + sudo_warn("unable to open %s", base); + close(fd); + } + } else { + switch (error) { + case SUDO_PATH_MISSING: + sudo_warn("unable to open %s", base); + break; + case SUDO_PATH_BAD_TYPE: + sudo_warnx("%s is not a regular file", base); + break; + case SUDO_PATH_WRONG_OWNER: + sudo_warnx("%s should be owned by uid %u", + base, (unsigned int) sudoers_uid); + break; + case SUDO_PATH_WORLD_WRITABLE: + sudo_warnx("%s is world writable", base); + break; + case SUDO_PATH_GROUP_WRITABLE: + sudo_warnx("%s should be owned by gid %u", + base, (unsigned int) sudoers_gid); + break; + default: + sudo_warnx("%s: internal error, unexpected error %d", + __func__, error); + break; + } + } + + debug_return_ptr(fp); +} + +bool +init_envtables(void) +{ + return(true); +} + +bool +set_perms(int perm) +{ + return true; +} + +bool +restore_perms(void) +{ + return true; +} + +void +init_eventlog_config(void) +{ + return; +} + +int +set_cmnd_path(const char *runchroot) +{ + /* Reallocate user_cmnd to catch bugs in command_matches(). */ + char *new_cmnd = strdup(orig_cmnd); + if (new_cmnd == NULL) + return NOT_FOUND_ERROR; + free(user_cmnd); + user_cmnd = new_cmnd; + return FOUND; +} + +static bool +print_defaults(struct sudo_lbuf *lbuf) +{ + struct defaults *def, *next; + debug_decl(print_defaults, SUDOERS_DEBUG_UTIL); + + TAILQ_FOREACH_SAFE(def, &parsed_policy.defaults, entries, next) + sudoers_format_default_line(lbuf, &parsed_policy, def, &next, false); + + debug_return_bool(!sudo_lbuf_error(lbuf)); +} + +static int +print_alias(struct sudoers_parse_tree *parse_tree, struct alias *a, void *v) +{ + struct sudo_lbuf *lbuf = v; + struct member *m; + debug_decl(print_alias, SUDOERS_DEBUG_UTIL); + + sudo_lbuf_append(lbuf, "%s %s = ", alias_type_to_string(a->type), + a->name); + TAILQ_FOREACH(m, &a->members, entries) { + if (m != TAILQ_FIRST(&a->members)) + sudo_lbuf_append(lbuf, ", "); + sudoers_format_member(lbuf, parse_tree, m, NULL, UNSPEC); + } + sudo_lbuf_append(lbuf, "\n"); + + debug_return_int(sudo_lbuf_error(lbuf) ? -1 : 0); +} + +static bool +print_aliases(struct sudo_lbuf *lbuf) +{ + debug_decl(print_aliases, SUDOERS_DEBUG_UTIL); + + alias_apply(&parsed_policy, print_alias, lbuf); + + debug_return_bool(!sudo_lbuf_error(lbuf)); +} + +static void +dump_sudoers(struct sudo_lbuf *lbuf) +{ + debug_decl(dump_sudoers, SUDOERS_DEBUG_UTIL); + + /* Print Defaults */ + if (!print_defaults(lbuf)) + goto done; + if (lbuf->len > 0) { + sudo_lbuf_print(lbuf); + sudo_lbuf_append(lbuf, "\n"); + } + + /* Print Aliases */ + if (!print_aliases(lbuf)) + goto done; + if (lbuf->len > 1) { + sudo_lbuf_print(lbuf); + sudo_lbuf_append(lbuf, "\n"); + } + + /* Print User_Specs */ + if (!sudoers_format_userspecs(lbuf, &parsed_policy, NULL, false, true)) + goto done; + if (lbuf->len > 1) { + sudo_lbuf_print(lbuf); + } + +done: + if (sudo_lbuf_error(lbuf)) { + if (errno == ENOMEM) + sudo_fatalx(U_("%s: %s"), __func__, U_("unable to allocate memory")); + } + + debug_return; +} + +static int +testsudoers_output(const char *buf) +{ + return fputs(buf, stdout); +} + +static int +testsudoers_error(const char *buf) +{ + return fputs(buf, stderr); +} + +static void +usage(void) +{ + (void) fprintf(stderr, "usage: %s [-dt] [-G sudoers_gid] [-g group] [-h host] [-i input_format] [-P grfile] [-p pwfile] [-U sudoers_uid] [-u user] <user> <command> [args]\n", getprogname()); + exit(EXIT_FAILURE); +} |