/*
* "$Id$"
*
- * Process management routines for the Common UNIX Printing System (CUPS).
+ * Process management routines for the CUPS scheduler.
*
- * Copyright 2007-2009 by Apple Inc.
+ * Copyright 2007-2012 by Apple Inc.
* Copyright 1997-2007 by Easy Software Products, all rights reserved.
*
* These coded instructions, statements, and computer programs are the
#include <grp.h>
#ifdef __APPLE__
# include <libgen.h>
-#endif /* __APPLE__ */
-#ifdef HAVE_SANDBOX_H
-# define __APPLE_API_PRIVATE
-# include <sandbox.h>
-#endif /* HAVE_SANDBOX_H */
+#endif /* __APPLE__ */
/*
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");
- cupsFilePuts(fp, "(debug deny)\n");
cupsFilePuts(fp, "(allow default)\n");
cupsFilePrintf(fp,
"(deny file-write* file-read-data file-read-metadata\n"
- " (regex #\"^%s/\"))\n", request);
+ " (regex"
+ " #\"^%s$\"" /* RequestRoot */
+ " #\"^%s/\"" /* RequestRoot/... */
+ ")%s)\n",
+ request, request, nodebug);
+ if (!RunUser)
+ cupsFilePrintf(fp,
+ "(deny file-write* file-read-data file-read-metadata\n"
+ " (regex"
+ " #\"^/Users$\""
+ " #\"^/Users/\""
+ ")%s)\n", nodebug);
cupsFilePrintf(fp,
"(deny file-write*\n"
- " (regex #\"^%s\" #\"^/private/etc\" #\"^/usr/local/etc\" "
- "#\"^/Library\" #\"^/System\" #\"^/Users\"))\n", root);
+ " (regex"
+ " #\"^%s$\"" /* ServerRoot */
+ " #\"^%s/\"" /* ServerRoot/... */
+ " #\"^/private/etc$\""
+ " #\"^/private/etc/\""
+ " #\"^/usr/local/etc$\""
+ " #\"^/usr/local/etc/\""
+ " #\"^/Library$\""
+ " #\"^/Library/\""
+ " #\"^/System$\""
+ " #\"^/System/\""
+ ")%s)\n",
+ root, root, nodebug);
+ /* Specifically allow applications to stat RequestRoot */
+ cupsFilePrintf(fp,
+ "(allow file-read-metadata\n"
+ " (regex"
+ " #\"^%s$\"" /* RequestRoot */
+ "))\n",
+ request);
cupsFilePrintf(fp,
"(allow file-write* file-read-data file-read-metadata\n"
- " (regex #\"^%s$\" #\"^%s/\" #\"^%s$\" #\"^%s/\""
+ " (regex"
+ " #\"^%s$\"" /* TempDir */
+ " #\"^%s/\"" /* TempDir/... */
+ " #\"^%s$\"" /* CacheDir */
+ " #\"^%s/\"" /* CacheDir/... */
+ " #\"^%s/Library$\"" /* RequestRoot/Library */
+ " #\"^%s/Library/\"" /* RequestRoot/Library/... */
" #\"^/Library/Application Support/\""
" #\"^/Library/Caches/\""
" #\"^/Library/Preferences/\""
- " #\"^/Library/Printers/\""
+ " #\"^/Library/Printers/.*/\""
+ " #\"^/Users/Shared/\""
"))\n",
- temp, temp, cache, cache);
- cupsFilePuts(fp,
- "(deny file-write*\n"
- " (regex #\"^/Library/Printers/PPDs/\""
- " #\"^/Library/Printers/PPD Plugins/\""
- "))\n");
+ temp, temp, cache, cache, request, request);
+ cupsFilePrintf(fp,
+ "(deny file-write*\n"
+ " (regex"
+ " #\"^/Library/Printers/PPDs$\""
+ " #\"^/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);
cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdEndProcess(pid=%d, force=%d)", pid,
force);
+ if (!pid)
+ return (0);
+
+ 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
int sidefd, /* I - Sidechannel file descriptor */
int root, /* I - Run as root? */
void *profile, /* I - Security profile to use */
- int job_id, /* I - Job associated with process */
+ cupsd_job_t *job, /* I - Job associated with process */
int *pid) /* O - Process ID */
{
+ 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 */
int user; /* Command UID */
- struct stat commandinfo; /* Command file information */
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_id=%d, pid=%p) = %d",
- command, argv, envp, infd, outfd, errfd, backfd, sidefd,
- root, profile, job_id, pid, *pid);
- cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to execute %s: %s", command,
- strerror(errno));
- return (0);
- }
- else if (commandinfo.st_mode & S_IWOTH)
- {
- *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_id=%d, pid=%p) = %d",
- command, argv, envp, infd, outfd, errfd, backfd, sidefd,
- root, profile, job_id, pid, *pid);
- cupsdLogMessage(CUPSD_LOG_ERROR,
- "Unable to execute %s: 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_id=%d, pid=%p) = %d",
- command, argv, envp, infd, outfd, errfd, backfd, sidefd,
- root, profile, job_id, 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 MacOS X - this allows MacOS 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 (infd != 0)
+ if (errfd != 2)
{
- close(0);
- if (infd > 0)
- dup(infd);
- else
- open("/dev/null", O_RDONLY);
+ if (errfd < 0)
+ errfd = open("/dev/null", O_WRONLY);
+
+ if (errfd != 2)
+ {
+ dup2(errfd, 2);
+ close(errfd);
+ }
}
- if (outfd != 1)
+
+ /*
+ * 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)
{
- close(1);
- if (outfd > 0)
- dup(outfd);
- else
- open("/dev/null", O_WRONLY);
+ if (infd < 0)
+ infd = open("/dev/null", O_RDONLY);
+
+ if (infd != 0)
+ {
+ dup2(infd, 0);
+ close(infd);
+ }
}
- if (errfd != 2)
+
+ if (outfd != 1)
{
- close(2);
- if (errfd > 0)
- dup(errfd);
- else
- open("/dev/null", O_WRONLY);
+ if (outfd < 0)
+ outfd = open("/dev/null", O_WRONLY);
+
+ if (outfd != 1)
+ {
+ dup2(outfd, 1);
+ close(outfd);
+ }
}
- if (backfd != 3)
+
+ if (backfd != 3 && backfd >= 0)
{
- close(3);
- if (backfd > 0)
- dup(backfd);
- else
- open("/dev/null", O_RDWR);
+ dup2(backfd, 3);
+ close(backfd);
fcntl(3, F_SETFL, O_NDELAY);
}
- if (sidefd != 4 && sidefd > 0)
+
+ if (sidefd != 4 && sidefd >= 0)
{
- close(4);
- dup(sidefd);
+ dup2(sidefd, 4);
+ close(sidefd);
fcntl(4, F_SETFL, O_NDELAY);
}
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.
- */
-
- setgid(Group);
- setgroups(1, &Group);
- }
+ if (!RunUser && user && setuid(user))
+ exit(errno + 100);
/*
* Change umask to restrict permissions on created files...
#ifdef HAVE_SIGSET
sigset(SIGTERM, SIG_DFL);
sigset(SIGCHLD, SIG_DFL);
+ sigset(SIGPIPE, SIG_DFL);
#elif defined(HAVE_SIGACTION)
memset(&action, 0, sizeof(action));
sigaction(SIGTERM, &action, NULL);
sigaction(SIGCHLD, &action, NULL);
+ sigaction(SIGPIPE, &action, NULL);
#else
signal(SIGTERM, SIG_DFL);
signal(SIGCHLD, SIG_DFL);
+ signal(SIGPIPE, SIG_DFL);
#endif /* HAVE_SIGSET */
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);
-
- perror(command);
+ execv(exec_path, argv);
- 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_id;
- strcpy(proc->name, command);
+ proc->job_id = job ? job->id : 0;
+ _cups_strcpy(proc->name, command);
cupsArrayAdd(process_array, proc);
}
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_id=%d, pid=%p) = %d",
+ "profile=%p, job=%p(%d), pid=%p) = %d",
command, argv, envp, infd, outfd, errfd, backfd, sidefd,
- root, profile, job_id, pid, *pid);
+ root, profile, job, job ? job->id : 0, pid, *pid);
return (*pid);
}