/*
- * "$Id: process.c 4719 2005-09-28 21:12:44Z mike $"
+ * "$Id$"
*
- * Process management routines for the Common UNIX Printing System (CUPS).
+ * Process management routines for the CUPS scheduler.
*
- * Copyright 1997-2005 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 Easy Software Products 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 missing or damaged please contact Easy Software Products
- * at:
- *
- * Attn: CUPS Licensing Information
- * Easy Software Products
- * 44141 Airport View Drive, Suite 204
- * Hollywood, Maryland 20636 USA
- *
- * Voice: (301) 373-9600
- * EMail: cups-info@cups.org
- * WWW: http://www.cups.org
- *
- * Contents:
- *
- * cupsdEndProcess() - End a process.
- * cupsdStartProcess() - Start a process.
+ * 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/".
*/
/*
#include "cupsd.h"
#include <grp.h>
+#ifdef __APPLE__
+# include <libgen.h>
+#endif /* __APPLE__ */
+
+
+/*
+ * Process structure...
+ */
+
+typedef struct
+{
+ int pid, /* Process ID */
+ job_id; /* Job associated with process */
+ char name[1]; /* Name of process */
+} cupsd_proc_t;
+
+
+/*
+ * Local globals...
+ */
+
+static cups_array_t *process_array = NULL;
+
+
+/*
+ * Local functions...
+ */
+
+static int compare_procs(cupsd_proc_t *a, cupsd_proc_t *b);
+#ifdef HAVE_SANDBOX_H
+static char *cupsd_requote(char *dst, const char *src, size_t dstsize);
+#endif /* HAVE_SANDBOX_H */
+
+
+/*
+ * 'cupsdCreateProfile()' - Create an execution profile for a subprocess.
+ */
+
+void * /* O - Profile or NULL on error */
+cupsdCreateProfile(int job_id) /* I - Job ID or 0 for none */
+{
+#ifdef HAVE_SANDBOX_H
+ cups_file_t *fp; /* File pointer */
+ char profile[1024], /* File containing the profile */
+ cache[1024], /* Quoted CacheDir */
+ request[1024], /* Quoted RequestRoot */
+ root[1024], /* Quoted ServerRoot */
+ temp[1024]; /* Quoted TempDir */
+ const char *nodebug; /* " (with no-log)" for no debug */
+
+
+ if (!UseProfiles)
+ {
+ /*
+ * Only use sandbox profiles as root...
+ */
+
+ cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d) = NULL",
+ job_id);
+
+ return (NULL);
+ }
+
+ if ((fp = cupsTempFile2(profile, sizeof(profile))) == NULL)
+ {
+ cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d) = NULL",
+ job_id);
+ cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to create security profile: %s",
+ strerror(errno));
+ 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, "(allow default)\n");
+ cupsFilePrintf(fp,
+ "(deny file-write* file-read-data file-read-metadata\n"
+ " (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$\""
+ " #\"^/Users/\""
+ ")%s)\n", nodebug);
+ cupsFilePrintf(fp,
+ "(deny file-write*\n"
+ " (regex"
+ " #\"^%s$\"" /* 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$\"" /* RequestRoot */
+ "))\n",
+ request);
+ cupsFilePrintf(fp,
+ "(allow file-write* file-read-data file-read-metadata\n"
+ " (regex"
+ " #\"^%s$\"" /* TempDir */
+ " #\"^%s/\"" /* TempDir/... */
+ " #\"^%s$\"" /* CacheDir */
+ " #\"^%s/\"" /* CacheDir/... */
+ " #\"^%s/Library$\"" /* RequestRoot/Library */
+ " #\"^%s/Library/\"" /* RequestRoot/Library/... */
+ " #\"^/Library/Application Support/\""
+ " #\"^/Library/Caches/\""
+ " #\"^/Library/Preferences/\""
+ " #\"^/Library/Printers/.*/\""
+ " #\"^/Users/Shared/\""
+ "))\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, "cupsdCreateProfile(job_id=%d) = \"%s\"",
+ job_id, profile);
+ return ((void *)strdup(profile));
+
+#else
+ cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d) = NULL",
+ job_id);
+
+ return (NULL);
+#endif /* HAVE_SANDBOX_H */
+}
+
+
+/*
+ * 'cupsdDestroyProfile()' - Delete an execution profile.
+ */
+
+void
+cupsdDestroyProfile(void *profile) /* I - Profile */
+{
+ cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdDeleteProfile(profile=\"%s\")",
+ profile ? (char *)profile : "(null)");
+
+#ifdef HAVE_SANDBOX_H
+ if (profile)
+ {
+ unlink((char *)profile);
+ free(profile);
+ }
+#endif /* HAVE_SANDBOX_H */
+}
/*
cupsdEndProcess(int pid, /* I - Process ID */
int force) /* I - Force child to die */
{
+ 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
}
+/*
+ * 'cupsdFinishProcess()' - Finish a process and get its name.
+ */
+
+const char * /* O - Process name */
+cupsdFinishProcess(int pid, /* I - Process ID */
+ char *name, /* I - Name buffer */
+ int namelen, /* I - Size of name buffer */
+ int *job_id) /* O - Job ID pointer or NULL */
+{
+ cupsd_proc_t key, /* Search key */
+ *proc; /* Matching process */
+
+
+ key.pid = pid;
+
+ if ((proc = (cupsd_proc_t *)cupsArrayFind(process_array, &key)) != NULL)
+ {
+ if (job_id)
+ *job_id = proc->job_id;
+
+ strlcpy(name, proc->name, namelen);
+ cupsArrayRemove(process_array, proc);
+ free(proc);
+ }
+ else
+ {
+ if (job_id)
+ *job_id = 0;
+
+ strlcpy(name, "unknown", namelen);
+ }
+
+ cupsdLogMessage(CUPSD_LOG_DEBUG2,
+ "cupsdFinishProcess(pid=%d, name=%p, namelen=%d, "
+ "job_id=%p(%d)) = \"%s\"", pid, name, namelen, job_id,
+ job_id ? *job_id : 0, name);
+
+ return (name);
+}
+
+
/*
* 'cupsdStartProcess()' - Start a process.
*/
int /* O - Process ID or 0 */
cupsdStartProcess(
- const char *command, /* I - Full path to command */
- char *argv[], /* I - Command-line arguments */
- char *envp[], /* I - Environment */
- int infd, /* I - Standard input file descriptor */
- int outfd, /* I - Standard output file descriptor */
- int errfd, /* I - Standard error file descriptor */
- int backfd, /* I - Backchannel file descriptor */
- int root, /* I - Run as root? */
- int *pid) /* O - Process ID */
+ const char *command, /* I - Full path to command */
+ char *argv[], /* I - Command-line arguments */
+ char *envp[], /* I - Environment */
+ int infd, /* I - Standard input file descriptor */
+ int outfd, /* I - Standard output file descriptor */
+ int errfd, /* I - Standard error file descriptor */
+ int backfd, /* I - Backchannel file descriptor */
+ int sidefd, /* I - Sidechannel file descriptor */
+ int root, /* I - Run as root? */
+ void *profile, /* I - Security profile to use */
+ 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 */
+ 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 */
+ struct sigaction action; /* POSIX signal handler */
#endif /* HAVE_SIGACTION && !HAVE_SIGSET */
+#if defined(__APPLE__)
+ char processPath[1024], /* CFProcessPath environment variable */
+ linkpath[1024]; /* Link path for symlinks... */
+ int linkbytes; /* Bytes for link path */
+#endif /* __APPLE__ */
- cupsdLogMessage(CUPSD_LOG_DEBUG2,
- "cupsdStartProcess(\"%s\", %p, %p, %d, %d, %d)",
- command, argv, envp, infd, outfd, errfd);
+ *pid = 0;
+
+ /*
+ * Figure out the UID for the child process...
+ */
+
+ if (RunUser)
+ user = RunUser;
+ else if (root)
+ user = 0;
+ else
+ user = User;
+
+ /*
+ * Check the permissions of the command we are running...
+ */
+
+ 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 OS X - this allows OS X programs to access
+ * their bundle resources properly...
+ */
+
+ if ((linkbytes = readlink(command, linkpath, sizeof(linkpath) - 1)) > 0)
+ {
+ /*
+ * Yes, this is a symlink to the actual program, nul-terminate and
+ * use it...
+ */
+
+ linkpath[linkbytes] = '\0';
+
+ if (linkpath[0] == '/')
+ snprintf(processPath, sizeof(processPath), "CFProcessPath=%s",
+ linkpath);
+ else
+ snprintf(processPath, sizeof(processPath), "CFProcessPath=%s/%s",
+ dirname((char *)command), linkpath);
+ }
+ else
+ snprintf(processPath, sizeof(processPath), "CFProcessPath=%s", command);
+
+ envp[0] = processPath; /* Replace <CFProcessPath> string */
+ }
+#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)
{
- close(0);
- if (infd > 0)
- dup(infd);
- else
- open("/dev/null", O_RDONLY);
+ if (infd < 0)
+ infd = open("/dev/null", O_RDONLY);
+
+ if (infd != 0)
+ {
+ dup2(infd, 0);
+ close(infd);
+ }
}
+
if (outfd != 1)
{
- close(1);
- if (outfd > 0)
- dup(outfd);
- else
- open("/dev/null", O_WRONLY);
+ if (outfd < 0)
+ outfd = open("/dev/null", O_WRONLY);
+
+ if (outfd != 1)
+ {
+ dup2(outfd, 1);
+ close(outfd);
+ }
}
- if (errfd != 2)
+
+ if (backfd != 3 && backfd >= 0)
{
- close(2);
- if (errfd > 0)
- dup(errfd);
- else
- open("/dev/null", O_WRONLY);
+ dup2(backfd, 3);
+ close(backfd);
+ fcntl(3, F_SETFL, O_NDELAY);
}
- if (backfd != 3)
+
+ if (sidefd != 4 && sidefd >= 0)
{
- close(3);
- if (backfd > 0)
- dup(backfd);
- else
- open("/dev/null", O_RDWR);
- fcntl(3, F_SETFL, O_NDELAY);
+ dup2(sidefd, 4);
+ close(sidefd);
+ fcntl(4, F_SETFL, O_NDELAY);
}
/*
* Change the priority of the process based on the FilterNice setting.
- * (this is not done for backends...)
+ * (this is not done for root processes...)
*/
if (!root)
nice(FilterNice);
/*
- * Change user to something "safe"...
+ * Reset group membership to just the main one we belong to.
*/
- if (!root && !RunUser)
- {
- /*
- * Running as root, so change to non-priviledged user...
- */
-
- if (setgid(Group))
- exit(errno);
+ if (!RunUser && setgid(Group))
+ exit(errno + 100);
- if (setgroups(1, &Group))
- exit(errno);
+ if (!RunUser && setgroups(1, &Group))
+ exit(errno + 100);
- if (setuid(User))
- exit(errno);
- }
- else
- {
- /*
- * Reset group membership to just the main one we belong to.
- */
+ /*
+ * Change user to something "safe"...
+ */
- 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);
+ execv(exec_path, argv);
- perror(command);
-
- exit(errno);
+ exit(errno + 100);
}
else if (*pid < 0)
{
*pid = 0;
}
+ else
+ {
+ 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;
+ _cups_strcpy(proc->name, command);
+
+ cupsArrayAdd(process_array, proc);
+ }
+ }
+ }
cupsdReleaseSignals();
+ 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);
+
return (*pid);
}
/*
- * End of "$Id: process.c 4719 2005-09-28 21:12:44Z mike $".
+ * 'compare_procs()' - Compare two processes.
+ */
+
+static int /* O - Result of comparison */
+compare_procs(cupsd_proc_t *a, /* I - First process */
+ cupsd_proc_t *b) /* I - Second process */
+{
+ return (a->pid - b->pid);
+}
+
+
+#ifdef HAVE_SANDBOX_H
+/*
+ * 'cupsd_requote()' - Make a regular-expression version of a string.
+ */
+
+static char * /* O - Quoted string */
+cupsd_requote(char *dst, /* I - Destination buffer */
+ const char *src, /* I - Source string */
+ size_t dstsize) /* I - Size of destination buffer */
+{
+ int ch; /* Current character */
+ char *dstptr, /* Current position in buffer */
+ *dstend; /* End of destination buffer */
+
+
+ dstptr = dst;
+ dstend = dst + dstsize - 2;
+
+ while (*src && dstptr < dstend)
+ {
+ ch = *src++;
+
+ if (ch == '/' && !*src)
+ break; /* Don't add trailing slash */
+
+ if (strchr(".?*()[]^$\\", ch))
+ *dstptr++ = '\\';
+
+ *dstptr++ = (char)ch;
+ }
+
+ *dstptr = '\0';
+
+ return (dst);
+}
+#endif /* HAVE_SANDBOX_H */
+
+
+/*
+ * End of "$Id$".
*/
projects / thirdparty / cups.git / blobdiff