+++ /dev/null
-/*
- * Copyright (c) 1996, 1998-2005, 2007-2010
- * 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 <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 __STDC__
-# include <stdarg.h>
-#else
-# include <varargs.h>
-#endif
-
-#include "sudo.h"
-#include "interfaces.h"
-#include "parse.h"
-#include "redblack.h"
-#include <gram.h>
-
-struct sudoersfile {
- struct sudoersfile *prev, *next;
- char *path;
- char *tpath;
- int fd;
- int modified;
- int doedit;
-};
-TQ_DECLARE(sudoersfile);
-
-/*
- * Function prototypes
- */
-static RETSIGTYPE quit __P((int));
-static char *get_args __P((char *));
-static char *get_editor __P((char **));
-static void get_hostname __P((void));
-static char whatnow __P((void));
-static int check_aliases __P((int, int));
-static int check_syntax __P((char *, int, int));
-static int edit_sudoers __P((struct sudoersfile *, char *, char *, int));
-static int install_sudoers __P((struct sudoersfile *, int));
-static int print_unused __P((void *, void *));
-static int reparse_sudoers __P((char *, char *, int, int));
-static int run_command __P((char *, char **));
-static void print_selfref __P((char *, int, int, int));
-static void print_undefined __P((char *, int, int, int));
-static void setup_signals __P((void));
-static void usage __P((void)) __attribute__((__noreturn__));
-
-extern void yyerror __P((const char *));
-extern void yyrestart __P((FILE *));
-
-/*
- * External globals exported by the parser
- */
-extern struct rbtree *aliases;
-extern FILE *yyin;
-extern char *sudoers, *errorfile;
-extern int errorlineno, parse_error;
-/* For getopt(3) */
-extern char *optarg;
-extern int optind;
-
-/*
- * Globals
- */
-int Argc;
-char **Argv;
-int num_interfaces;
-struct interface *interfaces;
-struct sudo_user sudo_user;
-struct passwd *list_pw;
-static struct sudoersfile_list sudoerslist;
-static struct rbtree *alias_freelist;
-
-int
-main(argc, argv)
- int argc;
- char **argv;
-{
- struct sudoersfile *sp;
- char *args, *editor, *sudoers_path;
- int ch, checkonly, quiet, strict, oldperms;
-#if defined(SUDO_DEVEL) && defined(__OpenBSD__)
- extern char *malloc_options;
- malloc_options = "AFGJPR";
-#endif
-
- Argv = argv;
- if ((Argc = argc) < 1)
- usage();
-
- /*
- * 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);
- exit(0);
- case 'c':
- checkonly++; /* check mode */
- break;
- case 'f':
- sudoers_path = optarg; /* sudoers file path */
- oldperms = TRUE;
- break;
- case 's':
- strict++; /* strict mode */
- break;
- case 'q':
- quiet++; /* quiet mode */
- break;
- default:
- usage();
- }
- }
- argc -= optind;
- argv += optind;
- if (argc)
- usage();
-
- sudo_setpwent();
- sudo_setgrent();
-
- /* Mock up a fake sudo_user struct. */
- user_cmnd = "";
- if ((sudo_user.pw = sudo_getpwuid(getuid())) == NULL)
- errorx(1, "you don't exist in the passwd database");
- get_hostname();
-
- /* Setup defaults data structures. */
- init_defaults();
-
- if (checkonly)
- exit(check_syntax(sudoers_path, quiet, strict));
-
- /*
- * 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. */
- tq_foreach_fwd(&sudoerslist, sp) {
- if (!sp->modified)
- (void) unlink(sp->tpath);
- else
- (void) install_sudoers(sp, oldperms);
- }
-
- exit(0);
-}
-
-/*
- * Edit each sudoers file.
- * Returns TRUE on success, else FALSE.
- */
-static int
-edit_sudoers(sp, editor, args, lineno)
- struct sudoersfile *sp;
- char *editor, *args;
- int lineno;
-{
- int tfd; /* sudoers temp file descriptor */
- int 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 */
-
-#ifdef HAVE_FSTAT
- if (fstat(sp->fd, &sb) == -1)
-#else
- if (stat(sp->path, &sb) == -1)
-#endif
- error(1, "can't 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';
- write(tfd, buf, 1);
- }
- }
- (void) close(tfd);
- }
- (void) touch(-1, sp->tpath, &orig_mtim);
-
- /* Find the length of the argument vector */
- ac = 3 + (lineno > 0);
- if (args) {
- int 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 (?!?!).
- */
- gettime(&tv1);
- if (run_command(editor, av) != -1) {
- gettime(&tv2);
- /*
- * Sanity checks.
- */
- if (stat(sp->tpath, &sb) < 0) {
- warningx("cannot stat temporary file (%s), %s unchanged",
- sp->tpath, sp->path);
- return(FALSE);
- }
- if (sb.st_size == 0 && orig_size != 0) {
- warningx("zero length temporary file (%s), %s unchanged",
- sp->tpath, sp->path);
- sp->modified = TRUE;
- return(FALSE);
- }
- } else {
- warningx("editor (%s) failed, %s unchanged", editor, sp->path);
- return(FALSE);
- }
-
- /* 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);
-
- return(TRUE);
-}
-
-/*
- * Parse sudoers after editing and re-edit any ones that caused a parse error.
- * Returns TRUE on success, else FALSE.
- */
-static int
-reparse_sudoers(editor, args, strict, quiet)
- char *editor, *args;
- int strict, quiet;
-{
- struct sudoersfile *sp, *last;
- FILE *fp;
- int ch;
-
- /*
- * 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, "can't 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' : cleanup(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, can't 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);
-
- return(TRUE);
-}
-
-/*
- * Set the owner and mode on a sudoers temp file and
- * move it into place. Returns TRUE on success, else FALSE.
- */
-static int
-install_sudoers(sp, oldperms)
- struct sudoersfile *sp;
- int oldperms;
-{
- struct stat sb;
-
- /*
- * 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. */
-#ifdef HAVE_FSTAT
- if (fstat(sp->fd, &sb) == -1)
-#else
- if (stat(sp->path, &sb) == -1)
-#endif
- error(1, "can't stat %s", sp->path);
- (void) chown(sp->tpath, sb.st_uid, sb.st_gid);
- (void) chmod(sp->tpath, sb.st_mode & 0777);
- } else {
- if (chown(sp->tpath, SUDOERS_UID, SUDOERS_GID) != 0) {
- warning("unable to set (uid, gid) of %s to (%d, %d)",
- sp->tpath, SUDOERS_UID, SUDOERS_GID);
- return(FALSE);
- }
- if (chmod(sp->tpath, SUDOERS_MODE) != 0) {
- warning("unable to change mode of %s to 0%o", sp->tpath,
- SUDOERS_MODE);
- return(FALSE);
- }
- }
-
- /*
- * 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;
- return(FALSE);
- }
- efree(sp->tpath);
- sp->tpath = NULL;
- } else {
- warning("error renaming %s, %s unchanged", sp->tpath, sp->path);
- (void) unlink(sp->tpath);
- return(FALSE);
- }
- }
- return(TRUE);
-}
-
-/* STUB */
-void
-set_fqdn()
-{
- return;
-}
-
-/* STUB */
-void
-init_envtables()
-{
- return;
-}
-
-/* STUB */
-int
-user_is_exempt()
-{
- return(FALSE);
-}
-
-/* STUB */
-void
-sudo_setspent()
-{
- return;
-}
-
-/* STUB */
-void
-sudo_endspent()
-{
- return;
-}
-
-char *
-sudo_getepw(pw)
- const struct passwd *pw;
-{
- return (pw->pw_passwd);
-}
-
-/*
- * Assuming a parse error occurred, prompt the user for what they want
- * to do now. Returns the first letter of their choice.
- */
-static char
-whatnow()
-{
- int choice, c;
-
- 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':
- return(choice);
- default:
- (void) puts("Options are:");
- (void) puts(" (e)dit sudoers file again");
- (void) puts(" e(x)it without saving changes to sudoers file");
- (void) puts(" (Q)uit and save changes to sudoers file (DANGER!)\n");
- }
- }
-}
-
-/*
- * Install signal handlers for visudo.
- */
-static void
-setup_signals()
-{
- sigaction_t sa;
-
- /*
- * 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);
-}
-
-static int
-run_command(path, argv)
- char *path;
- char **argv;
-{
- int status;
- pid_t pid, rv;
-
- switch (pid = fork()) {
- case -1:
- error(1, "unable to run %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 {
-#ifdef sudo_waitpid
- rv = sudo_waitpid(pid, &status, 0);
-#else
- rv = wait(&status);
-#endif
- } while (rv == -1 && errno == EINTR);
-
- if (rv == -1 || !WIFEXITED(status))
- return(-1);
- return(WEXITSTATUS(status));
-}
-
-static int
-check_syntax(sudoers_path, quiet, strict)
- char *sudoers_path;
- int quiet;
- int strict;
-{
- struct stat sb;
- int error;
-
- if ((yyin = fopen(sudoers_path, "r")) == NULL) {
- if (!quiet)
- warning("unable to open %s", sudoers_path);
- exit(1);
- }
- 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;
- }
- error = parse_error;
- if (!quiet) {
- if (parse_error) {
- 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 {
- (void) printf("%s: parsed OK\n", sudoers_path);
- }
- }
- /* Check mode and owner in strict mode. */
-#ifdef HAVE_FSTAT
- if (strict && fstat(fileno(yyin), &sb) == 0)
-#else
- if (strict && stat(sudoers_path, &sb) == 0)
-#endif
- {
- if (sb.st_uid != SUDOERS_UID || sb.st_gid != SUDOERS_GID) {
- error = TRUE;
- if (!quiet) {
- fprintf(stderr, "%s: wrong owner (uid, gid) should be (%d, %d)\n",
- sudoers_path, SUDOERS_UID, SUDOERS_GID);
- }
- }
- if ((sb.st_mode & 07777) != SUDOERS_MODE) {
- error = TRUE;
- if (!quiet) {
- fprintf(stderr, "%s: bad permissions, should be mode 0%o\n",
- sudoers_path, SUDOERS_MODE);
- }
- }
- }
-
- return(error);
-}
-
-/*
- * 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(path, doedit, keepopen)
- const char *path;
- int doedit;
- int *keepopen;
-{
- struct sudoersfile *entry;
- FILE *fp;
-
- /* Check for existing entry */
- tq_foreach_fwd(&sudoerslist, entry) {
- if (strcmp(path, entry->path) == 0)
- break;
- }
- if (entry == NULL) {
- entry = emalloc(sizeof(*entry));
- entry->path = estrdup(path);
- entry->modified = 0;
- entry->prev = entry;
- entry->next = NULL;
- entry->fd = open(entry->path, O_RDWR | O_CREAT, SUDOERS_MODE);
- entry->tpath = NULL;
- entry->doedit = doedit;
- if (entry->fd == -1) {
- warning("%s", entry->path);
- efree(entry);
- return(NULL);
- }
- if (!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;
- return(fp);
-}
-
-static char *
-get_editor(args)
- char **args;
-{
- char *Editor, *EditorArgs, *EditorPath, *UserEditor, *UserEditorArgs;
-
- /*
- * 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;
- return(Editor);
-}
-
-/*
- * Split out any command line arguments and return them.
- */
-static char *
-get_args(cmnd)
- char *cmnd;
-{
- char *args;
-
- args = cmnd;
- while (*args && !isblank((unsigned char) *args))
- args++;
- if (*args) {
- *args++ = '\0';
- while (*args && isblank((unsigned char) *args))
- args++;
- }
- return(*args ? args : NULL);
-}
-
-/*
- * Look up the hostname and set user_host and user_shost.
- */
-static void
-get_hostname()
-{
- char *p, thost[MAXHOSTNAMELEN + 1];
-
- if (gethostname(thost, sizeof(thost)) != 0) {
- user_host = user_shost = "localhost";
- return;
- }
- 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;
- }
-}
-
-static int
-alias_remove_recursive(name, type, strict, quiet)
- char *name;
- int type;
- int strict;
- int quiet;
-{
- struct member *m;
- struct alias *a;
- int error = 0;
-
- if ((a = alias_find(name, type)) != NULL) {
- tq_foreach_fwd(&a->members, m) {
- if (m->type == ALIAS) {
- if (strcmp(name, m->name) == 0) {
- print_selfref(m->name, type, strict, quiet);
- error = 1;
- } else {
- if (!alias_remove_recursive(m->name, type, strict, quiet))
- error = 1;
- }
- }
- }
- }
- alias_seqno++;
- a = alias_remove(name, type);
- if (a)
- rbinsert(alias_freelist, a);
- return(error);
-}
-
-/*
- * Iterate through the sudoers datastructures looking for undefined
- * aliases or unused aliases.
- */
-static int
-check_aliases(strict, quiet)
- int strict;
- int quiet;
-{
- struct cmndspec *cs;
- struct member *m, *binding;
- struct privilege *priv;
- struct userspec *us;
- struct defaults *d;
- int atype, error = 0;
-
- alias_freelist = rbcreate(alias_compare);
-
- /* Forward check. */
- tq_foreach_fwd(&userspecs, us) {
- tq_foreach_fwd(&us->users, m) {
- if (m->type == ALIAS) {
- alias_seqno++;
- if (alias_find(m->name, USERALIAS) == NULL) {
- print_undefined(m->name, USERALIAS, strict, quiet);
- error++;
- }
- }
- }
- tq_foreach_fwd(&us->privileges, priv) {
- tq_foreach_fwd(&priv->hostlist, m) {
- if (m->type == ALIAS) {
- alias_seqno++;
- if (alias_find(m->name, HOSTALIAS) == NULL) {
- print_undefined(m->name, HOSTALIAS, strict, quiet);
- error++;
- }
- }
- }
- tq_foreach_fwd(&priv->cmndlist, cs) {
- tq_foreach_fwd(&cs->runasuserlist, m) {
- if (m->type == ALIAS) {
- alias_seqno++;
- if (alias_find(m->name, RUNASALIAS) == NULL) {
- print_undefined(m->name, RUNASALIAS, strict, quiet);
- error++;
- }
- }
- }
- if ((m = cs->cmnd)->type == ALIAS) {
- alias_seqno++;
- if (alias_find(m->name, CMNDALIAS) == NULL) {
- print_undefined(m->name, CMNDALIAS, strict, quiet);
- error++;
- }
- }
- }
- }
- }
-
- /* Reverse check (destructive) */
- tq_foreach_fwd(&userspecs, us) {
- tq_foreach_fwd(&us->users, m) {
- if (m->type == ALIAS) {
- if (!alias_remove_recursive(m->name, USERALIAS, strict, quiet))
- error++;
- }
- }
- tq_foreach_fwd(&us->privileges, priv) {
- tq_foreach_fwd(&priv->hostlist, m) {
- if (m->type == ALIAS)
- if (!alias_remove_recursive(m->name, HOSTALIAS, strict,
- quiet))
- error++;
- }
- tq_foreach_fwd(&priv->cmndlist, cs) {
- tq_foreach_fwd(&cs->runasuserlist, m) {
- if (m->type == ALIAS)
- if (!alias_remove_recursive(m->name, RUNASALIAS,
- strict, quiet))
- error++;
- }
- if ((m = cs->cmnd)->type == ALIAS)
- if (!alias_remove_recursive(m->name, CMNDALIAS, strict,
- quiet))
- error++;
- }
- }
- }
- 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)
- if (!alias_remove_recursive(m->name, atype, strict, quiet))
- error++;
- }
- }
- }
- 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");
-
- return (strict ? error : 0);
-}
-
-static void
-print_undefined(name, type, strict, quiet)
- char *name;
- int type;
- int strict;
- int quiet;
-{
- if (!quiet) {
- warningx("%s: %s_Alias `%s' referenced but not defined",
- strict ? "Error" : "Warning",
- type == HOSTALIAS ? "Host" : type == CMNDALIAS ? "Cmnd" :
- type == USERALIAS ? "User" : type == RUNASALIAS ? "Runas" :
- "Unknown", name);
- }
-}
-
-static void
-print_selfref(name, type, strict, quiet)
- char *name;
- int type;
- int strict;
- int quiet;
-{
- if (!quiet) {
- warningx("%s: %s_Alias `%s' references self",
- strict ? "Error" : "Warning",
- type == HOSTALIAS ? "Host" : type == CMNDALIAS ? "Cmnd" :
- type == USERALIAS ? "User" : type == RUNASALIAS ? "Runas" :
- "Unknown", name);
- }
-}
-
-static int
-print_unused(v1, v2)
- void *v1;
- void *v2;
-{
- struct alias *a = (struct alias *)v1;
- char *prefix = (char *)v2;
-
- warningx("%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(gotsignal)
- 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 RETSIGTYPE
-quit(signo)
- int signo;
-{
- cleanup(signo);
-#define emsg " exiting due to signal.\n"
- write(STDERR_FILENO, getprogname(), strlen(getprogname()));
- write(STDERR_FILENO, emsg, sizeof(emsg) - 1);
- _exit(signo);
-}
-
-static void
-usage()
-{
- (void) fprintf(stderr, "usage: %s [-c] [-q] [-s] [-V] [-f sudoers]\n",
- getprogname());
- exit(1);
-}