/*
- * Copyright (c) 2004-2008 Todd C. Miller <Todd.Miller@courtesan.com>
+ * Copyright (c) 2004-2008, 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
#include <config.h>
+#if defined(HAVE_SETRESUID) || defined(HAVE_SETREUID) || defined(HAVE_SETEUID)
+
#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#endif /* STDC_HEADERS */
#ifdef HAVE_STRING_H
# include <string.h>
-#else
-# ifdef HAVE_STRINGS_H
-# include <strings.h>
-# endif
#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 <grp.h>
#include <pwd.h>
#include <signal.h>
#include <errno.h>
#if TIME_WITH_SYS_TIME
# include <time.h>
#endif
-#ifndef HAVE_TIMESPEC
-# include <emul/timespec.h>
-#endif
#include "sudo.h"
-extern sigaction_t saved_sa_int, saved_sa_quit, saved_sa_tstp;
-extern char **environ;
+static char *find_editor __P((int *argc_out, char ***argv_out));
-static char *find_editor();
+extern char **NewArgv; /* XXX */
/*
* Wrapper to allow users to edit privileged files with their own uid.
int
sudo_edit(argc, argv, envp)
int argc;
- char **argv;
- char **envp;
+ char *argv[];
+ char *envp[];
{
ssize_t nread, nwritten;
- pid_t kidpid, pid;
const char *tmpdir;
- char **nargv, **ap, *editor, *cp;
+ char *cp, *suff, **nargv, *editor, **files;
+ char **editor_argv = NULL;
char buf[BUFSIZ];
- int error, i, ac, ofd, tfd, nargc, rval, tmplen, wasblank;
+ int rc, i, j, ac, ofd, tfd, nargc, rval, nfiles, tmplen;
+ int editor_argc = 0;
struct stat sb;
- struct timespec ts1, ts2;
+ struct timeval tv, tv1, tv2;
struct tempfile {
char *tfile;
char *ofile;
- struct timespec omtim;
+ struct timeval omtim;
off_t osize;
} *tf;
+ /* Determine user's editor. */
+ editor = find_editor(&editor_argc, &editor_argv);
+ if (editor == NULL)
+ return 1;
+
/*
* Find our temporary directory, one of /var/tmp, /usr/tmp, or /tmp
*/
while (tmplen > 0 && tmpdir[tmplen - 1] == '/')
tmplen--;
- /*
- * Close password, shadow, and group files before we try to open
- * user-specified files to prevent the opening of things like /dev/fd/4
- */
- sudo_endpwent();
- sudo_endgrent();
-
/*
* For each file specified by the user, make a temporary version
* and copy the contents of the original to it.
*/
- tf = emalloc2(argc - 1, sizeof(*tf));
- zero_bytes(tf, (argc - 1) * sizeof(*tf));
- for (i = 0, ap = argv + 1; i < argc - 1 && *ap != NULL; i++, ap++) {
- error = -1;
+ files = argv + 1;
+ nfiles = argc - 1;
+ tf = emalloc2(nfiles, sizeof(*tf));
+ zero_bytes(tf, nfiles * sizeof(*tf));
+ for (i = 0, j = 0; i < nfiles; i++) {
+ rc = -1;
set_perms(PERM_RUNAS);
- if ((ofd = open(*ap, O_RDONLY, 0644)) != -1 || errno == ENOENT) {
+ if ((ofd = open(files[i], O_RDONLY, 0644)) != -1 || errno == ENOENT) {
if (ofd == -1) {
zero_bytes(&sb, sizeof(sb)); /* new file */
- error = 0;
+ rc = 0;
} else {
#ifdef HAVE_FSTAT
- error = fstat(ofd, &sb);
+ rc = fstat(ofd, &sb);
#else
- error = stat(tf[i].ofile, &sb);
+ rc = stat(tf[j].ofile, &sb);
#endif
}
}
set_perms(PERM_ROOT);
- if (error || (ofd != -1 && !S_ISREG(sb.st_mode))) {
- if (error)
- warning("%s", *ap);
+ if (rc || (ofd != -1 && !S_ISREG(sb.st_mode))) {
+ if (rc)
+ warning("%s", files[i]);
else
- warningx("%s: not a regular file", *ap);
+ warningx("%s: not a regular file", files[i]);
if (ofd != -1)
close(ofd);
- argc--;
- i--;
continue;
}
- tf[i].ofile = *ap;
- tf[i].omtim.tv_sec = mtim_getsec(sb);
- tf[i].omtim.tv_nsec = mtim_getnsec(sb);
- tf[i].osize = sb.st_size;
- if ((cp = strrchr(tf[i].ofile, '/')) != NULL)
+ tf[j].ofile = files[i];
+ tf[j].osize = sb.st_size;
+ mtim_get(&sb, &tf[j].omtim);
+ if ((cp = strrchr(tf[j].ofile, '/')) != NULL)
cp++;
else
- cp = tf[i].ofile;
- easprintf(&tf[i].tfile, "%.*s/%s.XXXXXXXX", tmplen, tmpdir, cp);
+ cp = tf[j].ofile;
+ suff = strrchr(cp, '.');
+ if (suff != NULL) {
+ easprintf(&tf[j].tfile, "%.*s/%.*sXXXXXXXX%s", tmplen, tmpdir, (int)(size_t)(suff - cp), cp, suff);
+ } else {
+ easprintf(&tf[j].tfile, "%.*s/%s.XXXXXXXX", tmplen, tmpdir, cp);
+ }
set_perms(PERM_USER);
- tfd = mkstemp(tf[i].tfile);
+ tfd = mkstemps(tf[j].tfile, suff ? strlen(suff) : 0);
set_perms(PERM_ROOT);
if (tfd == -1) {
- warning("mkstemp");
+ warning("mkstemps");
goto cleanup;
}
if (ofd != -1) {
while ((nread = read(ofd, buf, sizeof(buf))) != 0) {
if ((nwritten = write(tfd, buf, nread)) != nread) {
if (nwritten == -1)
- warning("%s", tf[i].tfile);
+ warning("%s", tf[j].tfile);
else
- warningx("%s: short write", tf[i].tfile);
+ warningx("%s: short write", tf[j].tfile);
goto cleanup;
}
}
* resides. It is OK if touch() fails since we only use the info
* to determine whether or not a file has been modified.
*/
- (void) touch(tfd, NULL, &tf[i].omtim);
+ (void) touch(tfd, NULL, &tf[j].omtim);
#ifdef HAVE_FSTAT
- error = fstat(tfd, &sb);
+ rc = fstat(tfd, &sb);
#else
- error = stat(tf[i].tfile, &sb);
+ rc = stat(tf[j].tfile, &sb);
#endif
- if (!error) {
- tf[i].omtim.tv_sec = mtim_getsec(sb);
- tf[i].omtim.tv_nsec = mtim_getnsec(sb);
- }
+ if (!rc)
+ mtim_get(&sb, &tf[j].omtim);
close(tfd);
+ j++;
}
- if (argc == 1)
- return(1); /* no files readable, you lose */
-
- environ = envp;
- editor = find_editor();
+ if ((nfiles = j) == 0)
+ return 1; /* no files readable, you lose */
/*
* Allocate space for the new argument vector and fill it in.
- * The EDITOR and VISUAL environment variables may contain command
- * line args so look for those and alloc space for them too.
+ * We concatenate the editor with its args and the file list
+ * to create a new argv.
+ * We allocate an extra slot to be used if execve() fails.
*/
- nargc = argc;
- for (wasblank = FALSE, cp = editor; *cp != '\0'; cp++) {
- if (isblank((unsigned char) *cp))
- wasblank = TRUE;
- else if (wasblank) {
- wasblank = FALSE;
- nargc++;
- }
- }
- nargv = (char **) emalloc2(nargc + 1, sizeof(char *));
- ac = 0;
- for ((cp = strtok(editor, " \t")); cp != NULL; (cp = strtok(NULL, " \t")))
- nargv[ac++] = cp;
- for (i = 0; i < argc - 1 && ac < nargc; )
+ nargc = editor_argc + nfiles;
+ nargv = (char **) emalloc2(1 + nargc + 1, sizeof(char *));
+ nargv++;
+ for (ac = 0; ac < editor_argc; ac++)
+ nargv[ac] = editor_argv[ac];
+ for (i = 0; i < nfiles && ac < nargc; )
nargv[ac++] = tf[i++].tfile;
nargv[ac] = NULL;
- /* Allow the editor to be suspended. */
- (void) sigaction(SIGTSTP, &saved_sa_tstp, NULL);
-
/*
- * Fork and exec the editor with the invoking user's creds,
+ * Run the editor with the invoking user's creds,
* keeping track of the time spent in the editor.
*/
- gettime(&ts1);
- kidpid = fork();
- if (kidpid == -1) {
- warning("fork");
- goto cleanup;
- } else if (kidpid == 0) {
- /* child */
- (void) sigaction(SIGINT, &saved_sa_int, NULL);
- (void) sigaction(SIGQUIT, &saved_sa_quit, NULL);
- set_perms(PERM_FULL_USER);
- closefrom(def_closefrom);
- execvp(nargv[0], nargv);
- warning("unable to execute %s", nargv[0]);
- _exit(127);
- }
-
- /*
- * Wait for status from the child. Most modern kernels
- * will not let an unprivileged child process send a
- * signal to its privileged parent so we have to request
- * status when the child is stopped and then send the
- * same signal to our own pid.
- */
- do {
-#ifdef sudo_waitpid
- pid = sudo_waitpid(kidpid, &i, WUNTRACED);
-#else
- pid = wait(&i);
-#endif
- if (pid == kidpid) {
- if (WIFSTOPPED(i))
- kill(getpid(), WSTOPSIG(i));
- else
- break;
- }
- } while (pid != -1 || errno == EINTR);
- gettime(&ts2);
- if (pid == -1 || !WIFEXITED(i))
- rval = 1;
- else
- rval = WEXITSTATUS(i);
+ gettime(&tv1);
+ rval = run_command(editor, nargv, envp, user_uid, TRUE);
+ gettime(&tv2);
/* Copy contents of temp files to real ones */
- for (i = 0; i < argc - 1; i++) {
- error = -1;
+ for (i = 0; i < nfiles; i++) {
+ rc = -1;
set_perms(PERM_USER);
if ((tfd = open(tf[i].tfile, O_RDONLY, 0644)) != -1) {
#ifdef HAVE_FSTAT
- error = fstat(tfd, &sb);
+ rc = fstat(tfd, &sb);
#else
- error = stat(tf[i].tfile, &sb);
+ rc = stat(tf[i].tfile, &sb);
#endif
}
set_perms(PERM_ROOT);
- if (error || !S_ISREG(sb.st_mode)) {
- if (error)
+ if (rc || !S_ISREG(sb.st_mode)) {
+ if (rc)
warning("%s", tf[i].tfile);
else
warningx("%s: not a regular file", tf[i].tfile);
close(tfd);
continue;
}
- if (tf[i].osize == sb.st_size && tf[i].omtim.tv_sec == mtim_getsec(sb)
- && tf[i].omtim.tv_nsec == mtim_getnsec(sb)) {
+ mtim_get(&sb, &tv);
+ if (tf[i].osize == sb.st_size && timevalcmp(&tf[i].omtim, &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.
*/
-#ifdef HAVE_TIMESPECSUB2
- timespecsub(&ts1, &ts2);
-#else
- timespecsub(&ts1, &ts2, &ts2);
-#endif
- if (timespecisset(&ts2)) {
+ timevalsub(&tv1, &tv2);
+ if (timevalisset(&tv2)) {
warningx("%s unchanged", tf[i].ofile);
unlink(tf[i].tfile);
close(tfd);
close(ofd);
}
- return(rval);
+ return rval;
cleanup:
/* Clean up temp files and return. */
- for (i = 0; i < argc - 1; i++) {
+ for (i = 0; i < nfiles; i++) {
if (tf[i].tfile != NULL)
unlink(tf[i].tfile);
}
- return(1);
+ return 1;
+}
+
+static char *
+resolve_editor(editor, argc_out, argv_out)
+ char *editor;
+ int *argc_out;
+ char ***argv_out;
+{
+ char *cp, **nargv, *editor_path = NULL;
+ int ac, nargc, wasblank;
+
+ editor = estrdup(editor); /* becomes part of argv_out */
+
+ /*
+ * Split editor into an argument vector; editor is reused (do not free).
+ * The EDITOR and VISUAL environment variables may contain command
+ * line args so look for those and alloc space for them too.
+ */
+ nargc = 1;
+ for (wasblank = FALSE, cp = editor; *cp != '\0'; cp++) {
+ if (isblank((unsigned char) *cp))
+ wasblank = TRUE;
+ else if (wasblank) {
+ wasblank = FALSE;
+ nargc++;
+ }
+ }
+ /* If we can't find the editor in the user's PATH, give up. */
+ cp = strtok(editor, " \t");
+ if (cp == NULL ||
+ find_path(cp, &editor_path, NULL, getenv("PATH"), 0) != FOUND) {
+ efree(editor);
+ return NULL;
+ }
+ nargv = (char **) emalloc2(nargc + 1, sizeof(char *));
+ for (ac = 0; cp != NULL && ac < nargc; ac++) {
+ nargv[ac] = cp;
+ cp = strtok(NULL, " \t");
+ }
+ nargv[ac] = NULL;
+
+ *argc_out = nargc;
+ *argv_out = nargv;
+ return editor_path;
}
/*
- * Determine which editor to use. We don't bother restricting this
- * based on def_env_editor or def_editor since the editor runs with
- * the uid of the invoking user, not the runas (privileged) user.
+ * Determine which editor to use. We don't need to worry about restricting
+ * this to a "safe" editor since it runs with the uid of the invoking user,
+ * not the runas (privileged) user.
+ * Fills in argv_out with an argument vector suitable for execve() that
+ * includes the editor with the specified files.
*/
static char *
-find_editor()
+find_editor(argc_out, argv_out)
+ int *argc_out;
+ char ***argv_out;
{
- char *cp, *editor = NULL, **ev, *ev0[4];
+ char *cp, *editor, *editor_path = NULL, **ev, *ev0[4];
+ /*
+ * If any of SUDO_EDITOR, VISUAL or EDITOR are set, choose the first one.
+ */
ev0[0] = "SUDO_EDITOR";
ev0[1] = "VISUAL";
ev0[2] = "EDITOR";
ev0[3] = NULL;
for (ev = ev0; *ev != NULL; ev++) {
if ((editor = getenv(*ev)) != NULL && *editor != '\0') {
- if ((cp = strrchr(editor, '/')) != NULL)
- cp++;
- else
- cp = editor;
- /* Ignore "sudoedit" and "sudo" to avoid an endless loop. */
- if (strncmp(cp, "sudo", 4) != 0 ||
- (cp[4] != ' ' && cp[4] != '\0' && strcmp(cp + 4, "edit") != 0)) {
- editor = estrdup(editor);
+ editor_path = resolve_editor(editor, argc_out, argv_out);
+ if (editor_path != NULL)
break;
- }
}
- editor = NULL;
}
- if (editor == NULL) {
+ if (editor_path == NULL) {
+ /* def_editor could be a path, split it up */
editor = estrdup(def_editor);
- if ((cp = strchr(editor, ':')) != NULL)
- *cp = '\0'; /* def_editor could be a path */
+ cp = strtok(editor, ":");
+ while (cp != NULL && editor_path == NULL) {
+ editor_path = resolve_editor(cp, argc_out, argv_out);
+ cp = strtok(NULL, ":");
+ }
+ if (editor_path)
+ efree(editor);
}
- return(editor);
+ if (!editor_path) {
+ audit_failure(NewArgv, "%s: command not found", editor);
+ warningx("%s: command not found", editor);
+ }
+ return editor_path;
+}
+
+#else /* HAVE_SETRESUID || HAVE_SETREUID || HAVE_SETEUID */
+
+/*
+ * Must have the ability to change the effective uid to use sudoedit.
+ */
+int
+sudo_edit(argc, argv, envp)
+ int argc;
+ char *argv[];
+ char *envp[];
+{
+ return 1;
}
+
+#endif /* HAVE_SETRESUID || HAVE_SETREUID || HAVE_SETEUID */
projects / debian / sudo / blobdiff