--- /dev/null
+/*
+ * Copyright (c) 1996, 1998-2005, 2007-2012
+ * Todd C. Miller <Todd.Miller@courtesan.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * 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.
+ */
+
+/*
+ * Lock the sudoers file for safe editing (ala vipw) and check for parse errors.
+ */
+
+#define _SUDO_MAIN
+
+#ifdef __TANDEM
+# include <floss.h>
+#endif
+
+#include <config.h>
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#ifndef __TANDEM
+# include <sys/file.h>
+#endif
+#include <sys/wait.h>
+#include <stdio.h>
+#ifdef STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#else
+# ifdef HAVE_STDLIB_H
+# include <stdlib.h>
+# endif
+#endif /* STDC_HEADERS */
+#ifdef HAVE_STRING_H
+# include <string.h>
+#endif /* HAVE_STRING_H */
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+#endif /* HAVE_STRINGS_H */
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif /* HAVE_UNISTD_H */
+#include <stdarg.h>
+#include <ctype.h>
+#include <pwd.h>
+#include <grp.h>
+#include <signal.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#if TIME_WITH_SYS_TIME
+# include <time.h>
+#endif
+#ifdef HAVE_SETLOCALE
+# include <locale.h>
+#endif
+
+#include "sudoers.h"
+#include "interfaces.h"
+#include "parse.h"
+#include "redblack.h"
+#include "gettext.h"
+#include "sudoers_version.h"
+#include "sudo_conf.h"
+#include <gram.h>
+
+struct sudoersfile {
+ struct sudoersfile *prev, *next;
+ char *path;
+ char *tpath;
+ int fd;
+ int modified;
+ int doedit;
+};
+TQ_DECLARE(sudoersfile)
+
+sudo_conv_t sudo_conv; /* NULL in non-plugin */
+
+/*
+ * Function prototypes
+ */
+static void quit(int);
+static char *get_args(char *);
+static char *get_editor(char **);
+static void get_hostname(void);
+static int whatnow(void);
+static int check_aliases(bool, bool);
+static bool check_syntax(char *, bool, bool, bool);
+static bool edit_sudoers(struct sudoersfile *, char *, char *, int);
+static bool install_sudoers(struct sudoersfile *, bool);
+static int print_unused(void *, void *);
+static void reparse_sudoers(char *, char *, bool, bool);
+static int run_command(char *, char **);
+static int visudo_printf(int msg_type, const char *fmt, ...);
+static void setup_signals(void);
+static void help(void) __attribute__((__noreturn__));
+static void usage(int);
+
+void cleanup(int);
+
+extern void yyerror(const char *);
+extern void yyrestart(FILE *);
+
+/*
+ * External globals exported by the parser
+ */
+extern struct rbtree *aliases;
+extern FILE *yyin;
+extern char *sudoers, *errorfile;
+extern int errorlineno;
+extern bool parse_error;
+/* For getopt(3) */
+extern char *optarg;
+extern int optind;
+
+/*
+ * Globals
+ */
+struct interface *interfaces;
+struct sudo_user sudo_user;
+struct passwd *list_pw;
+sudo_printf_t sudo_printf = visudo_printf;
+static struct sudoersfile_list sudoerslist;
+static struct rbtree *alias_freelist;
+static bool checkonly;
+
+int
+main(int argc, char *argv[])
+{
+ struct sudoersfile *sp;
+ char *args, *editor, *sudoers_path;
+ int ch, exitcode = 0;
+ bool quiet, strict, oldperms;
+ debug_decl(main, SUDO_DEBUG_MAIN)
+
+#if defined(SUDO_DEVEL) && defined(__OpenBSD__)
+ {
+ extern char *malloc_options;
+ malloc_options = "AFGJPR";
+ }
+#endif
+
+#if !defined(HAVE_GETPROGNAME) && !defined(HAVE___PROGNAME)
+ setprogname(argc > 0 ? argv[0] : "visudo");
+#endif
+
+#ifdef HAVE_SETLOCALE
+ setlocale(LC_ALL, "");
+#endif
+ bindtextdomain("sudoers", LOCALEDIR); /* XXX - should have visudo domain */
+ textdomain("sudoers");
+
+ if (argc < 1)
+ usage(1);
+
+ /* Read sudo.conf. */
+ sudo_conf_read();
+
+ /*
+ * Arg handling.
+ */
+ checkonly = oldperms = quiet = strict = false;
+ sudoers_path = _PATH_SUDOERS;
+ while ((ch = getopt(argc, argv, "Vcf:sq")) != -1) {
+ switch (ch) {
+ case 'V':
+ (void) printf(_("%s version %s\n"), getprogname(), PACKAGE_VERSION);
+ (void) printf(_("%s grammar version %d\n"), getprogname(), SUDOERS_GRAMMAR_VERSION);
+ goto done;
+ case 'c':
+ checkonly++; /* check mode */
+ break;
+ case 'f':
+ sudoers_path = optarg; /* sudoers file path */
+ oldperms = true;
+ break;
+ case 'h':
+ help();
+ break;
+ case 's':
+ strict++; /* strict mode */
+ break;
+ case 'q':
+ quiet++; /* quiet mode */
+ break;
+ default:
+ usage(1);
+ }
+ }
+ /* There should be no other command line arguments. */
+ if (argc - optind != 0)
+ usage(1);
+
+ sudo_setpwent();
+ sudo_setgrent();
+
+ /* Mock up a fake sudo_user struct. */
+ user_cmnd = "";
+ if ((sudo_user.pw = sudo_getpwuid(getuid())) == NULL)
+ errorx(1, _("you do not exist in the %s database"), "passwd");
+ get_hostname();
+
+ /* Setup defaults data structures. */
+ init_defaults();
+
+ if (checkonly) {
+ exitcode = check_syntax(sudoers_path, quiet, strict, oldperms) ? 0 : 1;
+ goto done;
+ }
+
+ /*
+ * Parse the existing sudoers file(s) in quiet mode to highlight any
+ * existing errors and to pull in editor and env_editor conf values.
+ */
+ if ((yyin = open_sudoers(sudoers_path, true, NULL)) == NULL) {
+ error(1, "%s", sudoers_path);
+ }
+ init_parser(sudoers_path, 0);
+ yyparse();
+ (void) update_defaults(SETDEF_GENERIC|SETDEF_HOST|SETDEF_USER);
+
+ editor = get_editor(&args);
+
+ /* Install signal handlers to clean up temp files if we are killed. */
+ setup_signals();
+
+ /* Edit the sudoers file(s) */
+ tq_foreach_fwd(&sudoerslist, sp) {
+ if (!sp->doedit)
+ continue;
+ if (sp != tq_first(&sudoerslist)) {
+ printf(_("press return to edit %s: "), sp->path);
+ while ((ch = getchar()) != EOF && ch != '\n')
+ continue;
+ }
+ edit_sudoers(sp, editor, args, -1);
+ }
+
+ /* Check edited files for a parse error and re-edit any that fail. */
+ reparse_sudoers(editor, args, strict, quiet);
+
+ /* Install the sudoers temp files as needed. */
+ tq_foreach_fwd(&sudoerslist, sp) {
+ (void) install_sudoers(sp, oldperms);
+ }
+
+done:
+ sudo_debug_exit_int(__func__, __FILE__, __LINE__, sudo_debug_subsys, exitcode);
+ exit(exitcode);
+}
+
+/*
+ * List of editors that support the "+lineno" command line syntax.
+ * If an entry starts with '*' the tail end of the string is matched.
+ * No other wild cards are supported.
+ */
+static char *lineno_editors[] = {
+ "ex",
+ "nex",
+ "vi",
+ "nvi",
+ "vim",
+ "elvis",
+ "*macs",
+ "mg",
+ "vile",
+ "jove",
+ "pico",
+ "nano",
+ "ee",
+ "joe",
+ "zile",
+ NULL
+};
+
+/*
+ * Edit each sudoers file.
+ * Returns true on success, else false.
+ */
+static bool
+edit_sudoers(struct sudoersfile *sp, char *editor, char *args, int lineno)
+{
+ int tfd; /* sudoers temp file descriptor */
+ bool modified; /* was the file modified? */
+ int ac; /* argument count */
+ char **av; /* argument vector for run_command */
+ char *cp; /* scratch char pointer */
+ char buf[PATH_MAX*2]; /* buffer used for copying files */
+ char linestr[64]; /* string version of lineno */
+ struct timeval tv, tv1, tv2; /* time before and after edit */
+ struct timeval orig_mtim; /* starting mtime of sudoers file */
+ off_t orig_size; /* starting size of sudoers file */
+ ssize_t nread; /* number of bytes read */
+ struct stat sb; /* stat buffer */
+ bool rval = false; /* return value */
+ debug_decl(edit_sudoers, SUDO_DEBUG_UTIL)
+
+ if (fstat(sp->fd, &sb) == -1)
+ error(1, _("unable to stat %s"), sp->path);
+ orig_size = sb.st_size;
+ mtim_get(&sb, &orig_mtim);
+
+ /* Create the temp file if needed and set timestamp. */
+ if (sp->tpath == NULL) {
+ easprintf(&sp->tpath, "%s.tmp", sp->path);
+ tfd = open(sp->tpath, O_WRONLY | O_CREAT | O_TRUNC, 0600);
+ if (tfd < 0)
+ error(1, "%s", sp->tpath);
+
+ /* Copy sp->path -> sp->tpath and reset the mtime. */
+ if (orig_size != 0) {
+ (void) lseek(sp->fd, (off_t)0, SEEK_SET);
+ while ((nread = read(sp->fd, buf, sizeof(buf))) > 0)
+ if (write(tfd, buf, nread) != nread)
+ error(1, _("write error"));
+
+ /* Add missing newline at EOF if needed. */
+ if (nread > 0 && buf[nread - 1] != '\n') {
+ buf[0] = '\n';
+ if (write(tfd, buf, 1) != 1)
+ error(1, _("write error"));
+ }
+ }
+ (void) close(tfd);
+ }
+ (void) touch(-1, sp->tpath, &orig_mtim);
+
+ /* Does the editor support +lineno? */
+ if (lineno > 0)
+ {
+ char *editor_base = strrchr(editor, '/');
+ if (editor_base != NULL)
+ editor_base++;
+ else
+ editor_base = editor;
+ if (*editor_base == 'r')
+ editor_base++;
+
+ for (av = lineno_editors; (cp = *av) != NULL; av++) {
+ /* We only handle a leading '*' wildcard. */
+ if (*cp == '*') {
+ size_t blen = strlen(editor_base);
+ size_t clen = strlen(++cp);
+ if (blen >= clen) {
+ if (strcmp(cp, editor_base + blen - clen) == 0)
+ break;
+ }
+ } else if (strcmp(cp, editor_base) == 0)
+ break;
+ }
+ /* Disable +lineno if editor doesn't support it. */
+ if (cp == NULL)
+ lineno = -1;
+ }
+
+ /* Find the length of the argument vector */
+ ac = 3 + (lineno > 0);
+ if (args) {
+ bool wasblank;
+
+ ac++;
+ for (wasblank = false, cp = args; *cp; cp++) {
+ if (isblank((unsigned char) *cp))
+ wasblank = true;
+ else if (wasblank) {
+ wasblank = false;
+ ac++;
+ }
+ }
+ }
+
+ /* Build up argument vector for the command */
+ av = emalloc2(ac, sizeof(char *));
+ if ((av[0] = strrchr(editor, '/')) != NULL)
+ av[0]++;
+ else
+ av[0] = editor;
+ ac = 1;
+ if (lineno > 0) {
+ (void) snprintf(linestr, sizeof(linestr), "+%d", lineno);
+ av[ac++] = linestr;
+ }
+ if (args) {
+ for ((cp = strtok(args, " \t")); cp; (cp = strtok(NULL, " \t")))
+ av[ac++] = cp;
+ }
+ av[ac++] = sp->tpath;
+ av[ac++] = NULL;
+
+ /*
+ * Do the edit:
+ * We cannot check the editor's exit value against 0 since
+ * XPG4 specifies that vi's exit value is a function of the
+ * number of errors during editing (?!?!).
+ */
+ gettimeofday(&tv1, NULL);
+ if (run_command(editor, av) != -1) {
+ gettimeofday(&tv2, NULL);
+ /*
+ * Sanity checks.
+ */
+ if (stat(sp->tpath, &sb) < 0) {
+ warningx(_("unable to stat temporary file (%s), %s unchanged"),
+ sp->tpath, sp->path);
+ goto done;
+ }
+ if (sb.st_size == 0 && orig_size != 0) {
+ warningx(_("zero length temporary file (%s), %s unchanged"),
+ sp->tpath, sp->path);
+ sp->modified = true;
+ goto done;
+ }
+ } else {
+ warningx(_("editor (%s) failed, %s unchanged"), editor, sp->path);
+ goto done;
+ }
+
+ /* Set modified bit if use changed the file. */
+ modified = true;
+ mtim_get(&sb, &tv);
+ if (orig_size == sb.st_size && timevalcmp(&orig_mtim, &tv, ==)) {
+ /*
+ * If mtime and size match but the user spent no measurable
+ * time in the editor we can't tell if the file was changed.
+ */
+ timevalsub(&tv1, &tv2);
+ if (timevalisset(&tv2))
+ modified = false;
+ }
+
+ /*
+ * If modified in this edit session, mark as modified.
+ */
+ if (modified)
+ sp->modified = modified;
+ else
+ warningx(_("%s unchanged"), sp->tpath);
+
+ rval = true;
+done:
+ debug_return_bool(rval);
+}
+
+/*
+ * Parse sudoers after editing and re-edit any ones that caused a parse error.
+ */
+static void
+reparse_sudoers(char *editor, char *args, bool strict, bool quiet)
+{
+ struct sudoersfile *sp, *last;
+ FILE *fp;
+ int ch;
+ debug_decl(reparse_sudoers, SUDO_DEBUG_UTIL)
+
+ /*
+ * Parse the edited sudoers files and do sanity checking
+ */
+ do {
+ sp = tq_first(&sudoerslist);
+ last = tq_last(&sudoerslist);
+ fp = fopen(sp->tpath, "r+");
+ if (fp == NULL)
+ errorx(1, _("unable to re-open temporary file (%s), %s unchanged."),
+ sp->tpath, sp->path);
+
+ /* Clean slate for each parse */
+ init_defaults();
+ init_parser(sp->path, quiet);
+
+ /* Parse the sudoers temp file */
+ yyrestart(fp);
+ if (yyparse() && !parse_error) {
+ warningx(_("unabled to parse temporary file (%s), unknown error"),
+ sp->tpath);
+ parse_error = true;
+ errorfile = sp->path;
+ }
+ fclose(yyin);
+ if (!parse_error) {
+ if (!update_defaults(SETDEF_GENERIC|SETDEF_HOST|SETDEF_USER) ||
+ check_aliases(strict, quiet) != 0) {
+ parse_error = true;
+ errorfile = sp->path;
+ }
+ }
+
+ /*
+ * Got an error, prompt the user for what to do now
+ */
+ if (parse_error) {
+ switch (whatnow()) {
+ case 'Q' : parse_error = false; /* ignore parse error */
+ break;
+ case 'x' : /* XXX - should return instead of exiting */
+ cleanup(0);
+ sudo_debug_exit_int(__func__, __FILE__,
+ __LINE__, sudo_debug_subsys, 0);
+ exit(0);
+ break;
+ }
+ }
+ if (parse_error) {
+ /* Edit file with the parse error */
+ tq_foreach_fwd(&sudoerslist, sp) {
+ if (errorfile == NULL || strcmp(sp->path, errorfile) == 0) {
+ edit_sudoers(sp, editor, args, errorlineno);
+ break;
+ }
+ }
+ if (sp == NULL) {
+ errorx(1, _("internal error, unable to find %s in list!"),
+ sudoers);
+ }
+ }
+
+ /* If any new #include directives were added, edit them too. */
+ for (sp = last->next; sp != NULL; sp = sp->next) {
+ printf(_("press return to edit %s: "), sp->path);
+ while ((ch = getchar()) != EOF && ch != '\n')
+ continue;
+ edit_sudoers(sp, editor, args, errorlineno);
+ }
+ } while (parse_error);
+
+ debug_return;
+}
+
+/*
+ * Set the owner and mode on a sudoers temp file and
+ * move it into place. Returns true on success, else false.
+ */
+static bool
+install_sudoers(struct sudoersfile *sp, bool oldperms)
+{
+ struct stat sb;
+ bool rval = false;
+ debug_decl(install_sudoers, SUDO_DEBUG_UTIL)
+
+ if (!sp->modified) {
+ /*
+ * No changes but fix owner/mode if needed.
+ */
+ (void) unlink(sp->tpath);
+ if (!oldperms && fstat(sp->fd, &sb) != -1) {
+ if (sb.st_uid != SUDOERS_UID || sb.st_gid != SUDOERS_GID)
+ ignore_result(chown(sp->path, SUDOERS_UID, SUDOERS_GID));
+ if ((sb.st_mode & 0777) != SUDOERS_MODE)
+ ignore_result(chmod(sp->path, SUDOERS_MODE));
+ }
+ rval = true;
+ goto done;
+ }
+
+ /*
+ * Change mode and ownership of temp file so when
+ * we move it to sp->path things are kosher.
+ */
+ if (oldperms) {
+ /* Use perms of the existing file. */
+ if (fstat(sp->fd, &sb) == -1)
+ error(1, _("unable to stat %s"), sp->path);
+ if (chown(sp->tpath, sb.st_uid, sb.st_gid) != 0) {
+ warning(_("unable to set (uid, gid) of %s to (%u, %u)"),
+ sp->tpath, (unsigned int)sb.st_uid, (unsigned int)sb.st_gid);
+ }
+ if (chmod(sp->tpath, sb.st_mode & 0777) != 0) {
+ warning(_("unable to change mode of %s to 0%o"), sp->tpath,
+ (unsigned int)(sb.st_mode & 0777));
+ }
+ } else {
+ if (chown(sp->tpath, SUDOERS_UID, SUDOERS_GID) != 0) {
+ warning(_("unable to set (uid, gid) of %s to (%u, %u)"),
+ sp->tpath, SUDOERS_UID, SUDOERS_GID);
+ goto done;
+ }
+ if (chmod(sp->tpath, SUDOERS_MODE) != 0) {
+ warning(_("unable to change mode of %s to 0%o"), sp->tpath,
+ SUDOERS_MODE);
+ goto done;
+ }
+ }
+
+ /*
+ * Now that sp->tpath is sane (parses ok) it needs to be
+ * rename(2)'d to sp->path. If the rename(2) fails we try using
+ * mv(1) in case sp->tpath and sp->path are on different file systems.
+ */
+ if (rename(sp->tpath, sp->path) == 0) {
+ efree(sp->tpath);
+ sp->tpath = NULL;
+ } else {
+ if (errno == EXDEV) {
+ char *av[4];
+ warningx(_("%s and %s not on the same file system, using mv to rename"),
+ sp->tpath, sp->path);
+
+ /* Build up argument vector for the command */
+ if ((av[0] = strrchr(_PATH_MV, '/')) != NULL)
+ av[0]++;
+ else
+ av[0] = _PATH_MV;
+ av[1] = sp->tpath;
+ av[2] = sp->path;
+ av[3] = NULL;
+
+ /* And run it... */
+ if (run_command(_PATH_MV, av)) {
+ warningx(_("command failed: '%s %s %s', %s unchanged"),
+ _PATH_MV, sp->tpath, sp->path, sp->path);
+ (void) unlink(sp->tpath);
+ efree(sp->tpath);
+ sp->tpath = NULL;
+ goto done;
+ }
+ efree(sp->tpath);
+ sp->tpath = NULL;
+ } else {
+ warning(_("error renaming %s, %s unchanged"), sp->tpath, sp->path);
+ (void) unlink(sp->tpath);
+ goto done;
+ }
+ }
+ rval = true;
+done:
+ debug_return_bool(rval);
+}
+
+/* STUB */
+void
+set_fqdn(void)
+{
+ return;
+}
+
+/* STUB */
+void
+init_envtables(void)
+{
+ return;
+}
+
+/* STUB */
+bool
+user_is_exempt(void)
+{
+ return false;
+}
+
+/* STUB */
+void
+sudo_setspent(void)
+{
+ return;
+}
+
+/* STUB */
+void
+sudo_endspent(void)
+{
+ return;
+}
+
+/* STUB */
+int
+group_plugin_query(const char *user, const char *group, const struct passwd *pw)
+{
+ return false;
+}
+
+/*
+ * Assuming a parse error occurred, prompt the user for what they want
+ * to do now. Returns the first letter of their choice.
+ */
+static int
+whatnow(void)
+{
+ int choice, c;
+ debug_decl(whatnow, SUDO_DEBUG_UTIL)
+
+ for (;;) {
+ (void) fputs(_("What now? "), stdout);
+ choice = getchar();
+ for (c = choice; c != '\n' && c != EOF;)
+ c = getchar();
+
+ switch (choice) {
+ case EOF:
+ choice = 'x';
+ /* FALLTHROUGH */
+ case 'e':
+ case 'x':
+ case 'Q':
+ debug_return_int(choice);
+ default:
+ (void) puts(_("Options are:\n"
+ " (e)dit sudoers file again\n"
+ " e(x)it without saving changes to sudoers file\n"
+ " (Q)uit and save changes to sudoers file (DANGER!)\n"));
+ }
+ }
+}
+
+/*
+ * Install signal handlers for visudo.
+ */
+static void
+setup_signals(void)
+{
+ sigaction_t sa;
+ debug_decl(setup_signals, SUDO_DEBUG_UTIL)
+
+ /*
+ * Setup signal handlers to cleanup nicely.
+ */
+ zero_bytes(&sa, sizeof(sa));
+ sigemptyset(&sa.sa_mask);
+ sa.sa_flags = SA_RESTART;
+ sa.sa_handler = quit;
+ (void) sigaction(SIGTERM, &sa, NULL);
+ (void) sigaction(SIGHUP, &sa, NULL);
+ (void) sigaction(SIGINT, &sa, NULL);
+ (void) sigaction(SIGQUIT, &sa, NULL);
+
+ debug_return;
+}
+
+static int
+run_command(char *path, char **argv)
+{
+ int status;
+ pid_t pid, rv;
+ debug_decl(run_command, SUDO_DEBUG_UTIL)
+
+ switch (pid = sudo_debug_fork()) {
+ case -1:
+ error(1, _("unable to execute %s"), path);
+ break; /* NOTREACHED */
+ case 0:
+ sudo_endpwent();
+ sudo_endgrent();
+ closefrom(STDERR_FILENO + 1);
+ execv(path, argv);
+ warning(_("unable to run %s"), path);
+ _exit(127);
+ break; /* NOTREACHED */
+ }
+
+ do {
+ rv = waitpid(pid, &status, 0);
+ } while (rv == -1 && errno == EINTR);
+
+ if (rv != -1)
+ rv = WIFEXITED(status) ? WEXITSTATUS(status) : -1;
+ debug_return_int(rv);
+}
+
+static bool
+check_owner(const char *path, bool quiet)
+{
+ struct stat sb;
+ bool ok = true;
+ debug_decl(check_owner, SUDO_DEBUG_UTIL)
+
+ if (stat(path, &sb) == 0) {
+ if (sb.st_uid != SUDOERS_UID || sb.st_gid != SUDOERS_GID) {
+ ok = false;
+ if (!quiet) {
+ fprintf(stderr,
+ _("%s: wrong owner (uid, gid) should be (%u, %u)\n"),
+ path, SUDOERS_UID, SUDOERS_GID);
+ }
+ }
+ if ((sb.st_mode & 07777) != SUDOERS_MODE) {
+ ok = false;
+ if (!quiet) {
+ fprintf(stderr, _("%s: bad permissions, should be mode 0%o\n"),
+ path, SUDOERS_MODE);
+ }
+ }
+ }
+ debug_return_bool(ok);
+}
+
+static bool
+check_syntax(char *sudoers_path, bool quiet, bool strict, bool oldperms)
+{
+ bool ok = false;
+ debug_decl(check_syntax, SUDO_DEBUG_UTIL)
+
+ if (strcmp(sudoers_path, "-") == 0) {
+ yyin = stdin;
+ sudoers_path = "stdin";
+ } else if ((yyin = fopen(sudoers_path, "r")) == NULL) {
+ if (!quiet)
+ warning(_("unable to open %s"), sudoers_path);
+ goto done;
+ }
+ init_parser(sudoers_path, quiet);
+ if (yyparse() && !parse_error) {
+ if (!quiet)
+ warningx(_("failed to parse %s file, unknown error"), sudoers_path);
+ parse_error = true;
+ errorfile = sudoers_path;
+ }
+ if (!parse_error && check_aliases(strict, quiet) != 0) {
+ parse_error = true;
+ errorfile = sudoers_path;
+ }
+ ok = !parse_error;
+
+ if (parse_error) {
+ if (!quiet) {
+ if (errorlineno != -1)
+ (void) printf(_("parse error in %s near line %d\n"),
+ errorfile, errorlineno);
+ else
+ (void) printf(_("parse error in %s\n"), errorfile);
+ }
+ } else {
+ struct sudoersfile *sp;
+
+ /* Parsed OK, check mode and owner. */
+ if (oldperms || check_owner(sudoers_path, quiet))
+ (void) printf(_("%s: parsed OK\n"), sudoers_path);
+ else
+ ok = false;
+ tq_foreach_fwd(&sudoerslist, sp) {
+ if (oldperms || check_owner(sp->path, quiet))
+ (void) printf(_("%s: parsed OK\n"), sp->path);
+ else
+ ok = false;
+ }
+ }
+
+done:
+ debug_return_bool(ok);
+}
+
+/*
+ * Used to open (and lock) the initial sudoers file and to also open
+ * any subsequent files #included via a callback from the parser.
+ */
+FILE *
+open_sudoers(const char *path, bool doedit, bool *keepopen)
+{
+ struct sudoersfile *entry;
+ FILE *fp;
+ int open_flags;
+ debug_decl(open_sudoers, SUDO_DEBUG_UTIL)
+
+ if (checkonly)
+ open_flags = O_RDONLY;
+ else
+ open_flags = O_RDWR | O_CREAT;
+
+ /* Check for existing entry */
+ tq_foreach_fwd(&sudoerslist, entry) {
+ if (strcmp(path, entry->path) == 0)
+ break;
+ }
+ if (entry == NULL) {
+ entry = ecalloc(1, sizeof(*entry));
+ entry->path = estrdup(path);
+ /* entry->modified = 0; */
+ entry->prev = entry;
+ /* entry->next = NULL; */
+ entry->fd = open(entry->path, open_flags, SUDOERS_MODE);
+ /* entry->tpath = NULL; */
+ entry->doedit = doedit;
+ if (entry->fd == -1) {
+ warning("%s", entry->path);
+ efree(entry);
+ debug_return_ptr(NULL);
+ }
+ if (!checkonly && !lock_file(entry->fd, SUDO_TLOCK))
+ errorx(1, _("%s busy, try again later"), entry->path);
+ if ((fp = fdopen(entry->fd, "r")) == NULL)
+ error(1, "%s", entry->path);
+ tq_append(&sudoerslist, entry);
+ } else {
+ /* Already exists, open .tmp version if there is one. */
+ if (entry->tpath != NULL) {
+ if ((fp = fopen(entry->tpath, "r")) == NULL)
+ error(1, "%s", entry->tpath);
+ } else {
+ if ((fp = fdopen(entry->fd, "r")) == NULL)
+ error(1, "%s", entry->path);
+ rewind(fp);
+ }
+ }
+ if (keepopen != NULL)
+ *keepopen = true;
+ debug_return_ptr(fp);
+}
+
+static char *
+get_editor(char **args)
+{
+ char *Editor, *EditorArgs, *EditorPath, *UserEditor, *UserEditorArgs;
+ debug_decl(get_editor, SUDO_DEBUG_UTIL)
+
+ /*
+ * Check VISUAL and EDITOR environment variables to see which editor
+ * the user wants to use (we may not end up using it though).
+ * If the path is not fully-qualified, make it so and check that
+ * the specified executable actually exists.
+ */
+ UserEditorArgs = NULL;
+ if ((UserEditor = getenv("VISUAL")) == NULL || *UserEditor == '\0')
+ UserEditor = getenv("EDITOR");
+ if (UserEditor && *UserEditor == '\0')
+ UserEditor = NULL;
+ else if (UserEditor) {
+ UserEditorArgs = get_args(UserEditor);
+ if (find_path(UserEditor, &Editor, NULL, getenv("PATH"), 0) == FOUND) {
+ UserEditor = Editor;
+ } else {
+ if (def_env_editor) {
+ /* If we are honoring $EDITOR this is a fatal error. */
+ errorx(1, _("specified editor (%s) doesn't exist"), UserEditor);
+ } else {
+ /* Otherwise, just ignore $EDITOR. */
+ UserEditor = NULL;
+ }
+ }
+ }
+
+ /*
+ * See if we can use the user's choice of editors either because
+ * we allow any $EDITOR or because $EDITOR is in the allowable list.
+ */
+ Editor = EditorArgs = EditorPath = NULL;
+ if (def_env_editor && UserEditor) {
+ Editor = UserEditor;
+ EditorArgs = UserEditorArgs;
+ } else if (UserEditor) {
+ struct stat editor_sb;
+ struct stat user_editor_sb;
+ char *base, *userbase;
+
+ if (stat(UserEditor, &user_editor_sb) != 0) {
+ /* Should never happen since we already checked above. */
+ error(1, _("unable to stat editor (%s)"), UserEditor);
+ }
+ EditorPath = estrdup(def_editor);
+ Editor = strtok(EditorPath, ":");
+ do {
+ EditorArgs = get_args(Editor);
+ /*
+ * Both Editor and UserEditor should be fully qualified but
+ * check anyway...
+ */
+ if ((base = strrchr(Editor, '/')) == NULL)
+ continue;
+ if ((userbase = strrchr(UserEditor, '/')) == NULL) {
+ Editor = NULL;
+ break;
+ }
+ base++, userbase++;
+
+ /*
+ * We compare the basenames first and then use stat to match
+ * for sure.
+ */
+ if (strcmp(base, userbase) == 0) {
+ if (stat(Editor, &editor_sb) == 0 && S_ISREG(editor_sb.st_mode)
+ && (editor_sb.st_mode & 0000111) &&
+ editor_sb.st_dev == user_editor_sb.st_dev &&
+ editor_sb.st_ino == user_editor_sb.st_ino)
+ break;
+ }
+ } while ((Editor = strtok(NULL, ":")));
+ }
+
+ /*
+ * Can't use $EDITOR, try each element of def_editor until we
+ * find one that exists, is regular, and is executable.
+ */
+ if (Editor == NULL || *Editor == '\0') {
+ efree(EditorPath);
+ EditorPath = estrdup(def_editor);
+ Editor = strtok(EditorPath, ":");
+ do {
+ EditorArgs = get_args(Editor);
+ if (sudo_goodpath(Editor, NULL))
+ break;
+ } while ((Editor = strtok(NULL, ":")));
+
+ /* Bleah, none of the editors existed! */
+ if (Editor == NULL || *Editor == '\0')
+ errorx(1, _("no editor found (editor path = %s)"), def_editor);
+ }
+ *args = EditorArgs;
+ debug_return_str(Editor);
+}
+
+/*
+ * Split out any command line arguments and return them.
+ */
+static char *
+get_args(char *cmnd)
+{
+ char *args;
+ debug_decl(get_args, SUDO_DEBUG_UTIL)
+
+ args = cmnd;
+ while (*args && !isblank((unsigned char) *args))
+ args++;
+ if (*args) {
+ *args++ = '\0';
+ while (*args && isblank((unsigned char) *args))
+ args++;
+ }
+ debug_return_str(*args ? args : NULL);
+}
+
+/*
+ * Look up the hostname and set user_host and user_shost.
+ */
+static void
+get_hostname(void)
+{
+ char *p, thost[MAXHOSTNAMELEN + 1];
+ debug_decl(get_hostname, SUDO_DEBUG_UTIL)
+
+ if (gethostname(thost, sizeof(thost)) != -1) {
+ thost[sizeof(thost) - 1] = '\0';
+ user_host = estrdup(thost);
+
+ if ((p = strchr(user_host, '.'))) {
+ *p = '\0';
+ user_shost = estrdup(user_host);
+ *p = '.';
+ } else {
+ user_shost = user_host;
+ }
+ } else {
+ user_host = user_shost = "localhost";
+ }
+ debug_return;
+}
+
+static bool
+alias_remove_recursive(char *name, int type)
+{
+ struct member *m;
+ struct alias *a;
+ bool rval = true;
+ debug_decl(alias_remove_recursive, SUDO_DEBUG_ALIAS)
+
+ if ((a = alias_find(name, type)) != NULL) {
+ tq_foreach_fwd(&a->members, m) {
+ if (m->type == ALIAS) {
+ if (!alias_remove_recursive(m->name, type))
+ rval = false;
+ }
+ }
+ }
+ alias_seqno++;
+ a = alias_remove(name, type);
+ if (a)
+ rbinsert(alias_freelist, a);
+ debug_return_bool(rval);
+}
+
+static int
+check_alias(char *name, int type, int strict, int quiet)
+{
+ struct member *m;
+ struct alias *a;
+ int errors = 0;
+ debug_decl(check_alias, SUDO_DEBUG_ALIAS)
+
+ if ((a = alias_find(name, type)) != NULL) {
+ /* check alias contents */
+ tq_foreach_fwd(&a->members, m) {
+ if (m->type == ALIAS)
+ errors += check_alias(m->name, type, strict, quiet);
+ }
+ } else {
+ if (!quiet) {
+ char *fmt;
+ if (errno == ELOOP) {
+ fmt = strict ?
+ _("Error: cycle in %s_Alias `%s'") :
+ _("Warning: cycle in %s_Alias `%s'");
+ } else {
+ fmt = strict ?
+ _("Error: %s_Alias `%s' referenced but not defined") :
+ _("Warning: %s_Alias `%s' referenced but not defined");
+ }
+ warningx(fmt,
+ type == HOSTALIAS ? "Host" : type == CMNDALIAS ? "Cmnd" :
+ type == USERALIAS ? "User" : type == RUNASALIAS ? "Runas" :
+ "Unknown", name);
+ }
+ errors++;
+ }
+
+ debug_return_int(errors);
+}
+
+/*
+ * Iterate through the sudoers datastructures looking for undefined
+ * aliases or unused aliases.
+ */
+static int
+check_aliases(bool strict, bool quiet)
+{
+ struct cmndspec *cs;
+ struct member *m, *binding;
+ struct privilege *priv;
+ struct userspec *us;
+ struct defaults *d;
+ int atype, errors = 0;
+ debug_decl(check_aliases, SUDO_DEBUG_ALIAS)
+
+ alias_freelist = rbcreate(alias_compare);
+
+ /* Forward check. */
+ tq_foreach_fwd(&userspecs, us) {
+ tq_foreach_fwd(&us->users, m) {
+ if (m->type == ALIAS) {
+ alias_seqno++;
+ errors += check_alias(m->name, USERALIAS, strict, quiet);
+ }
+ }
+ tq_foreach_fwd(&us->privileges, priv) {
+ tq_foreach_fwd(&priv->hostlist, m) {
+ if (m->type == ALIAS) {
+ alias_seqno++;
+ errors += check_alias(m->name, HOSTALIAS, strict, quiet);
+ }
+ }
+ tq_foreach_fwd(&priv->cmndlist, cs) {
+ tq_foreach_fwd(&cs->runasuserlist, m) {
+ if (m->type == ALIAS) {
+ alias_seqno++;
+ errors += check_alias(m->name, RUNASALIAS, strict, quiet);
+ }
+ }
+ if ((m = cs->cmnd)->type == ALIAS) {
+ alias_seqno++;
+ errors += check_alias(m->name, CMNDALIAS, strict, quiet);
+ }
+ }
+ }
+ }
+
+ /* Reverse check (destructive) */
+ tq_foreach_fwd(&userspecs, us) {
+ tq_foreach_fwd(&us->users, m) {
+ if (m->type == ALIAS) {
+ alias_seqno++;
+ if (!alias_remove_recursive(m->name, USERALIAS))
+ errors++;
+ }
+ }
+ tq_foreach_fwd(&us->privileges, priv) {
+ tq_foreach_fwd(&priv->hostlist, m) {
+ if (m->type == ALIAS) {
+ alias_seqno++;
+ if (!alias_remove_recursive(m->name, HOSTALIAS))
+ errors++;
+ }
+ }
+ tq_foreach_fwd(&priv->cmndlist, cs) {
+ tq_foreach_fwd(&cs->runasuserlist, m) {
+ if (m->type == ALIAS) {
+ alias_seqno++;
+ if (!alias_remove_recursive(m->name, RUNASALIAS))
+ errors++;
+ }
+ }
+ if ((m = cs->cmnd)->type == ALIAS) {
+ alias_seqno++;
+ if (!alias_remove_recursive(m->name, CMNDALIAS))
+ errors++;
+ }
+ }
+ }
+ }
+ tq_foreach_fwd(&defaults, d) {
+ switch (d->type) {
+ case DEFAULTS_HOST:
+ atype = HOSTALIAS;
+ break;
+ case DEFAULTS_USER:
+ atype = USERALIAS;
+ break;
+ case DEFAULTS_RUNAS:
+ atype = RUNASALIAS;
+ break;
+ case DEFAULTS_CMND:
+ atype = CMNDALIAS;
+ break;
+ default:
+ continue; /* not an alias */
+ }
+ tq_foreach_fwd(&d->binding, binding) {
+ for (m = binding; m != NULL; m = m->next) {
+ if (m->type == ALIAS) {
+ alias_seqno++;
+ if (!alias_remove_recursive(m->name, atype))
+ errors++;
+ }
+ }
+ }
+ }
+ rbdestroy(alias_freelist, alias_free);
+
+ /* If all aliases were referenced we will have an empty tree. */
+ if (!no_aliases() && !quiet)
+ alias_apply(print_unused, strict ? "Error" : "Warning");
+
+ debug_return_int(strict ? errors : 0);
+}
+
+static int
+print_unused(void *v1, void *v2)
+{
+ struct alias *a = (struct alias *)v1;
+ char *prefix = (char *)v2;
+
+ warningx2(_("%s: unused %s_Alias %s"), prefix,
+ a->type == HOSTALIAS ? "Host" : a->type == CMNDALIAS ? "Cmnd" :
+ a->type == USERALIAS ? "User" : a->type == RUNASALIAS ? "Runas" :
+ "Unknown", a->name);
+ return 0;
+}
+
+/*
+ * Unlink any sudoers temp files that remain.
+ */
+void
+cleanup(int gotsignal)
+{
+ struct sudoersfile *sp;
+
+ tq_foreach_fwd(&sudoerslist, sp) {
+ if (sp->tpath != NULL)
+ (void) unlink(sp->tpath);
+ }
+ if (!gotsignal) {
+ sudo_endpwent();
+ sudo_endgrent();
+ }
+}
+
+/*
+ * Unlink sudoers temp files (if any) and exit.
+ */
+static void
+quit(int signo)
+{
+ const char *signame, *myname;
+
+ cleanup(signo);
+#define emsg " exiting due to signal: "
+ myname = getprogname();
+ signame = strsignal(signo);
+ ignore_result(write(STDERR_FILENO, myname, strlen(myname)));
+ ignore_result(write(STDERR_FILENO, emsg, sizeof(emsg) - 1));
+ ignore_result(write(STDERR_FILENO, signame, strlen(signame)));
+ ignore_result(write(STDERR_FILENO, "\n", 1));
+ _exit(signo);
+}
+
+static void
+usage(int fatal)
+{
+ (void) fprintf(fatal ? stderr : stdout,
+ "usage: %s [-chqsV] [-f sudoers]\n", getprogname());
+ if (fatal)
+ exit(1);
+}
+
+static void
+help(void)
+{
+ (void) printf(_("%s - safely edit the sudoers file\n\n"), getprogname());
+ usage(0);
+ (void) puts(_("\nOptions:\n"
+ " -c check-only mode\n"
+ " -f sudoers specify sudoers file location\n"
+ " -h display help message and exit\n"
+ " -q less verbose (quiet) syntax error messages\n"
+ " -s strict syntax checking\n"
+ " -V display version information and exit"));
+ exit(0);
+}
+
+static int
+visudo_printf(int msg_type, const char *fmt, ...)
+{
+ va_list ap;
+ FILE *fp;
+
+ switch (msg_type) {
+ case SUDO_CONV_INFO_MSG:
+ fp = stdout;
+ break;
+ case SUDO_CONV_ERROR_MSG:
+ fp = stderr;
+ break;
+ default:
+ errno = EINVAL;
+ return -1;
+ }
+
+ va_start(ap, fmt);
+ vfprintf(fp, fmt, ap);
+ va_end(ap);
+
+ return 0;
+}
projects / debian / sudo / blobdiff