Imported Upstream version 1.5.3upstream/1.5.3

1 files changed, 656 insertions, 0 deletions

diff --git a/scheduler/process.c b/scheduler/process.c
new file mode 100644
index 0000000..c1ca526
--- /dev/null
+++ b/scheduler/process.c
@@ -0,0 +1,656 @@
+/*
+ * "$Id: process.c 9790 2011-05-19 22:40:03Z mike $"
+ *
+ *   Process management routines for the CUPS scheduler.
+ *
+ *   Copyright 2007-2011 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.
+ */
+
+/*
+ * Include necessary headers...
+ */
+
+#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()' - End a process.
+ */
+
+int					/* O - 0 on success, -1 on failure */
+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
+    return (kill(pid, SIGTERM));
+}
+
+
+/*
+ * '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         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 */
+  int		user;			/* Command UID */
+  cupsd_proc_t	*proc;			/* New process record */
+#if defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET)
+  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__ */
+
+
+  *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 Mac OS X - this allows Mac 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...
+  */
+
+  cupsdHoldSignals();
+
+  if ((*pid = fork()) == 0)
+  {
+   /*
+    * 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 (infd < 0)
+        infd = open("/dev/null", O_RDONLY);
+
+      if (infd != 0)
+      {
+        dup2(infd, 0);
+	close(infd);
+      }
+    }
+
+    if (outfd != 1)
+    {
+      if (outfd < 0)
+        outfd = open("/dev/null", O_WRONLY);
+
+      if (outfd != 1)
+      {
+        dup2(outfd, 1);
+	close(outfd);
+      }
+    }
+
+    if (backfd != 3 && backfd >= 0)
+    {
+      dup2(backfd, 3);
+      close(backfd);
+      fcntl(3, F_SETFL, O_NDELAY);
+    }
+
+    if (sidefd != 4 && sidefd >= 0)
+    {
+      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 root processes...)
+    */
+
+    if (!root)
+      nice(FilterNice);
+
+   /*
+    * Reset group membership to just the main one we belong to.
+    */
+
+    if (!RunUser && setgid(Group))
+      exit(errno + 100);
+
+    if (!RunUser && setgroups(1, &Group))
+      exit(errno + 100);
+
+   /*
+    * Change user to something "safe"...
+    */
+
+    if (!RunUser && user && setuid(user))
+      exit(errno + 100);
+
+   /*
+    * Change umask to restrict permissions on created files...
+    */
+
+    umask(077);
+
+   /*
+    * Unblock signals before doing the exec...
+    */
+
+#ifdef HAVE_SIGSET
+    sigset(SIGTERM, SIG_DFL);
+    sigset(SIGCHLD, SIG_DFL);
+    sigset(SIGPIPE, SIG_DFL);
+#elif defined(HAVE_SIGACTION)
+    memset(&action, 0, sizeof(action));
+
+    sigemptyset(&action.sa_mask);
+    action.sa_handler = SIG_DFL;
+
+    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, log an error
+    * exit with a non-zero value...
+    */
+
+    if (envp)
+      execve(exec_path, argv, envp);
+    else
+      execv(exec_path, argv);
+
+    exit(errno + 100);
+  }
+  else if (*pid < 0)
+  {
+   /*
+    * Error - couldn't fork a new process!
+    */
+
+    cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to fork %s - %s.", command,
+                    strerror(errno));
+
+    *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);
+}
+
+
+/*
+ * '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 (strchr(".?*()[]^$\\", ch))
+      *dstptr++ = '\\';
+
+    *dstptr++ = ch;
+  }
+
+  *dstptr = '\0';
+
+  return (dst);
+}
+#endif /* HAVE_SANDBOX_H */
+
+
+/*
+ * End of "$Id: process.c 9790 2011-05-19 22:40:03Z mike $".
+ */