/*
- * "$Id: process.c 7256 2008-01-25 00:48:54Z mike $"
+ * "$Id$"
*
- * Process management routines for the CUPS scheduler.
+ * Process management routines for the CUPS scheduler.
*
- * Copyright 2007-2010 by Apple Inc.
- * Copyright 1997-2007 by Easy Software Products, all rights reserved.
+ * Copyright 2007-2014 by Apple Inc.
+ * Copyright 1997-2007 by Easy Software Products, all rights reserved.
*
- * These coded instructions, statements, and computer programs are the
- * property of Apple Inc. and are protected by Federal copyright
- * law. Distribution and use rights are outlined in the file "LICENSE.txt"
- * which should have been included with this file. If this file is
- * file is missing or damaged, see the license at "http://www.cups.org/".
- *
- * Contents:
- *
- * cupsdCreateProfile() - Create an execution profile for a subprocess.
- * cupsdDestroyProfile() - Delete an execution profile.
- * cupsdEndProcess() - End a process.
- * cupsdFinishProcess() - Finish a process and get its name.
- * cupsdStartProcess() - Start a process.
- * compare_procs() - Compare two processes.
- * cupsd_requote() - Make a regular-expression version of a string.
+ * These coded instructions, statements, and computer programs are the
+ * property of Apple Inc. and are protected by Federal copyright
+ * law. Distribution and use rights are outlined in the file "LICENSE.txt"
+ * which should have been included with this file. If this file is
+ * file is missing or damaged, see the license at "http://www.cups.org/".
*/
/*
#ifdef __APPLE__
# include <libgen.h>
#endif /* __APPLE__ */
-#ifdef HAVE_SANDBOX_H
-# define __APPLE_API_PRIVATE
-# include <sandbox.h>
-#endif /* HAVE_SANDBOX_H */
/*
request[1024], /* Quoted RequestRoot */
root[1024], /* Quoted ServerRoot */
temp[1024]; /* Quoted TempDir */
+ const char *nodebug; /* " (with no-log)" for no debug */
- if (!UseProfiles || RunUser)
+ if (!UseProfiles)
{
/*
* Only use sandbox profiles as root...
return (NULL);
}
+ fchown(cupsFileNumber(fp), RunUser, Group);
+ fchmod(cupsFileNumber(fp), 0640);
+
cupsd_requote(cache, CacheDir, sizeof(cache));
cupsd_requote(request, RequestRoot, sizeof(request));
cupsd_requote(root, ServerRoot, sizeof(root));
cupsd_requote(temp, TempDir, sizeof(temp));
+ nodebug = LogLevel < CUPSD_LOG_DEBUG ? " (with no-log)" : "";
+
cupsFilePuts(fp, "(version 1)\n");
- if (LogLevel >= CUPSD_LOG_DEBUG)
- cupsFilePuts(fp, "(debug deny)\n");
cupsFilePuts(fp, "(allow default)\n");
cupsFilePrintf(fp,
"(deny file-write* file-read-data file-read-metadata\n"
" (regex"
" #\"^%s$\"" /* RequestRoot */
" #\"^%s/\"" /* RequestRoot/... */
- " #\"^/Users$\""
- " #\"^/Users/\""
- "))\n",
- request, request);
+ ")%s)\n",
+ request, request, nodebug);
+ if (!RunUser)
+ cupsFilePrintf(fp,
+ "(deny file-write* file-read-data file-read-metadata\n"
+ " (regex"
+ " #\"^/Users$\""
+ " #\"^/Users/\""
+ ")%s)\n", nodebug);
cupsFilePrintf(fp,
"(deny file-write*\n"
" (regex"
" #\"^/Library/\""
" #\"^/System$\""
" #\"^/System/\""
- "))\n",
- root, root);
+ ")%s)\n",
+ root, root, nodebug);
/* Specifically allow applications to stat RequestRoot */
cupsFilePrintf(fp,
"(allow file-read-metadata\n"
" #\"^/Users/Shared/\""
"))\n",
temp, temp, cache, cache, request, request);
- cupsFilePuts(fp,
- "(deny file-write*\n"
- " (regex"
- " #\"^/Library/Printers/PPDs$\""
- " #\"^/Library/Printers/PPDs/\""
- " #\"^/Library/Printers/PPD Plugins$\""
- " #\"^/Library/Printers/PPD Plugins/\""
- "))\n");
+ cupsFilePrintf(fp,
+ "(deny file-write*\n"
+ " (regex"
+ " #\"^/Library/Printers/PPDs$\""
+ " #\"^/Library/Printers/PPDs/\""
+ " #\"^/Library/Printers/PPD Plugins$\""
+ " #\"^/Library/Printers/PPD Plugins/\""
+ ")%s)\n", nodebug);
if (job_id)
+ {
+ /*
+ * Allow job filters to read the spool file(s)...
+ */
+
cupsFilePrintf(fp,
"(allow file-read-data file-read-metadata\n"
" (regex #\"^%s/([ac]%05d|d%05d-[0-9][0-9][0-9])$\"))\n",
request, job_id, job_id);
+ }
+ else
+ {
+ /*
+ * Allow email notifications from notifiers...
+ */
+
+ cupsFilePuts(fp,
+ "(allow process-exec\n"
+ " (literal \"/usr/sbin/sendmail\")\n"
+ " (with no-sandbox)\n"
+ ")\n");
+ }
cupsFileClose(fp);
if (!pid)
return (0);
- else if (force)
+
+ if (!RunUser)
+ {
+ /*
+ * When running as root, cupsd puts child processes in their own process
+ * group. Using "-pid" sends a signal to all processes in the group.
+ */
+
+ pid = -pid;
+ }
+
+ if (force)
return (kill(pid, SIGKILL));
else
return (kill(pid, SIGTERM));
cupsd_job_t *job, /* I - Job associated with process */
int *pid) /* O - Process ID */
{
- int user; /* Command UID */
- struct stat commandinfo; /* Command file information */
+ int i; /* Looping var */
+ const char *exec_path = command; /* Command to be exec'd */
+ char *real_argv[103], /* Real command-line arguments */
+ cups_exec[1024]; /* Path to "cups-exec" program */
+ uid_t user; /* Command UID */
cupsd_proc_t *proc; /* New process record */
#if defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET)
struct sigaction action; /* POSIX signal handler */
#endif /* __APPLE__ */
+ *pid = 0;
+
+ /*
+ * Figure out the UID for the child process...
+ */
+
if (RunUser)
user = RunUser;
else if (root)
else
user = User;
- if (stat(command, &commandinfo))
- {
- *pid = 0;
-
- cupsdLogMessage(CUPSD_LOG_DEBUG2,
- "cupsdStartProcess(command=\"%s\", argv=%p, envp=%p, "
- "infd=%d, outfd=%d, errfd=%d, backfd=%d, sidefd=%d, root=%d, "
- "profile=%p, job=%p(%d), pid=%p) = %d",
- command, argv, envp, infd, outfd, errfd, backfd, sidefd,
- root, profile, job, job ? job->id : 0, pid, *pid);
- cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to execute %s: %s", command,
- strerror(errno));
-
- if (job && job->printer)
- {
- if (cupsdSetPrinterReasons(job->printer, "+cups-missing-filter-warning"))
- cupsdAddEvent(CUPSD_EVENT_PRINTER_STATE, job->printer, NULL,
- "Printer driver %s is missing.", command);
- }
-
- return (0);
- }
- else if (!RunUser &&
- ((commandinfo.st_mode & (S_ISUID | S_IWGRP | S_IWOTH)) ||
- commandinfo.st_uid))
- {
- *pid = 0;
-
- cupsdLogMessage(CUPSD_LOG_DEBUG2,
- "cupsdStartProcess(command=\"%s\", argv=%p, envp=%p, "
- "infd=%d, outfd=%d, errfd=%d, backfd=%d, sidefd=%d, root=%d, "
- "profile=%p, job=%p(%d), pid=%p) = %d",
- command, argv, envp, infd, outfd, errfd, backfd, sidefd,
- root, profile, job, job ? job->id : 0, pid, *pid);
- cupsdLogMessage(CUPSD_LOG_ERROR,
- "Unable to execute %s: insecure file permissions (0%o)",
- command, commandinfo.st_mode);
-
- if (job && job->printer)
- {
- if (cupsdSetPrinterReasons(job->printer, "+cups-insecure-filter-warning"))
- cupsdAddEvent(CUPSD_EVENT_PRINTER_STATE, job->printer, NULL,
- "Printer driver %s has insecure file permissions (0%o).",
- command, commandinfo.st_mode);
- }
-
- errno = EPERM;
-
- return (0);
- }
- else if ((commandinfo.st_uid != user || !(commandinfo.st_mode & S_IXUSR)) &&
- (commandinfo.st_gid != Group || !(commandinfo.st_mode & S_IXGRP)) &&
- !(commandinfo.st_mode & S_IXOTH))
- {
- *pid = 0;
+ /*
+ * Check the permissions of the command we are running...
+ */
- cupsdLogMessage(CUPSD_LOG_DEBUG2,
- "cupsdStartProcess(command=\"%s\", argv=%p, envp=%p, "
- "infd=%d, outfd=%d, errfd=%d, backfd=%d, sidefd=%d, root=%d, "
- "profile=%p, job=%p(%d), pid=%p) = %d",
- command, argv, envp, infd, outfd, errfd, backfd, sidefd,
- root, profile, job, job ? job->id : 0, pid, *pid);
- cupsdLogMessage(CUPSD_LOG_ERROR,
- "Unable to execute %s: no execute permissions (0%o)",
- command, commandinfo.st_mode);
-
- errno = EPERM;
+ if (_cupsFileCheck(command, _CUPS_FILE_CHECK_PROGRAM, !RunUser,
+ cupsdLogFCMessage, job ? job->printer : NULL))
return (0);
- }
#if defined(__APPLE__)
if (envp)
{
/*
- * Add special voodoo magic for Mac OS X - this allows Mac OS X
- * programs to access their bundle resources properly...
+ * Add special voodoo magic for OS X - this allows OS X programs to access
+ * their bundle resources properly...
*/
if ((linkbytes = readlink(command, linkpath, sizeof(linkpath) - 1)) > 0)
}
#endif /* __APPLE__ */
+ /*
+ * Use helper program when we have a sandbox profile...
+ */
+
+ if (profile)
+ {
+ snprintf(cups_exec, sizeof(cups_exec), "%s/daemon/cups-exec", ServerBin);
+
+ real_argv[0] = cups_exec;
+ real_argv[1] = profile;
+ real_argv[2] = (char *)command;
+
+ for (i = 0;
+ i < (int)(sizeof(real_argv) / sizeof(real_argv[0]) - 4) && argv[i];
+ i ++)
+ real_argv[i + 3] = argv[i];
+
+ real_argv[i + 3] = NULL;
+
+ argv = real_argv;
+ exec_path = cups_exec;
+ }
+
/*
* Block signals before forking...
*/
if ((*pid = fork()) == 0)
{
/*
- * Child process goes here...
- *
- * Update stdin/stdout/stderr as needed...
+ * Child process goes here; update stderr as needed...
+ */
+
+ if (errfd != 2)
+ {
+ if (errfd < 0)
+ errfd = open("/dev/null", O_WRONLY);
+
+ if (errfd != 2)
+ {
+ dup2(errfd, 2);
+ close(errfd);
+ }
+ }
+
+ /*
+ * Put this process in its own process group so that we can kill any child
+ * processes it creates.
+ */
+
+#ifdef HAVE_SETPGID
+ if (!RunUser && setpgid(0, 0))
+ exit(errno + 100);
+#else
+ if (!RunUser && setpgrp())
+ exit(errno + 100);
+#endif /* HAVE_SETPGID */
+
+ /*
+ * Update the remaining file descriptors as needed...
*/
if (infd != 0)
}
}
- if (errfd != 2)
- {
- if (errfd < 0)
- errfd = open("/dev/null", O_WRONLY);
-
- if (errfd != 2)
- {
- dup2(errfd, 2);
- close(errfd);
- }
- }
-
if (backfd != 3 && backfd >= 0)
{
dup2(backfd, 3);
if (!root)
nice(FilterNice);
-#ifdef HAVE_SANDBOX_H
/*
- * Run in a separate security profile...
+ * Reset group membership to just the main one we belong to.
*/
- if (profile)
- {
- char *error = NULL; /* Sandbox error, if any */
+ if (!RunUser && setgid(Group))
+ exit(errno + 100);
- if (sandbox_init((char *)profile, SANDBOX_NAMED_EXTERNAL, &error))
- {
- fprintf(stderr, "ERROR: sandbox_init failed: %s (%s)\n", error,
- strerror(errno));
- sandbox_free_error(error);
- }
- }
-#endif /* HAVE_SANDBOX_H */
+ if (!RunUser && setgroups(1, &Group))
+ exit(errno + 100);
/*
* Change user to something "safe"...
*/
- if (!root && !RunUser)
- {
- /*
- * Running as root, so change to non-priviledged user...
- */
-
- if (setgid(Group))
- exit(errno);
-
- if (setgroups(1, &Group))
- exit(errno);
-
- if (setuid(User))
- exit(errno);
- }
- else
- {
- /*
- * Reset group membership to just the main one we belong to.
- */
-
- if (setgid(Group) && !RunUser)
- exit(errno);
-
- if (setgroups(1, &Group) && !RunUser)
- exit(errno);
- }
+ if (!RunUser && user && setuid(user))
+ exit(errno + 100);
/*
* Change umask to restrict permissions on created files...
cupsdReleaseSignals();
/*
- * Execute the command; if for some reason this doesn't work,
- * return the error code...
+ * Execute the command; if for some reason this doesn't work, log an error
+ * exit with a non-zero value...
*/
if (envp)
- execve(command, argv, envp);
+ execve(exec_path, argv, envp);
else
- execv(command, argv);
+ execv(exec_path, argv);
- perror(command);
-
- exit(errno);
+ exit(errno + 100);
}
else if (*pid < 0)
{
{
if (!process_array)
process_array = cupsArrayNew((cups_array_func_t)compare_procs, NULL);
-
+
if (process_array)
{
if ((proc = calloc(1, sizeof(cupsd_proc_t) + strlen(command))) != NULL)
{
proc->pid = *pid;
proc->job_id = job ? job->id : 0;
- strcpy(proc->name, command);
+ _cups_strcpy(proc->name, command);
cupsArrayAdd(process_array, proc);
}
{
ch = *src++;
+ if (ch == '/' && !*src)
+ break; /* Don't add trailing slash */
+
if (strchr(".?*()[]^$\\", ch))
*dstptr++ = '\\';
- *dstptr++ = ch;
+ *dstptr++ = (char)ch;
}
*dstptr = '\0';
/*
- * End of "$Id: process.c 7256 2008-01-25 00:48:54Z mike $".
+ * End of "$Id$".
*/
projects / thirdparty / cups.git / blobdiff