/*
- * "$Id: process.c 177 2006-06-21 00:20:03Z jlovell $"
+ * "$Id: process.c 7256 2008-01-25 00:48:54Z mike $"
*
* Process management routines for the Common UNIX Printing System (CUPS).
*
- * Copyright 1997-2006 by Easy Software Products, all rights reserved.
+ * Copyright 2007-2009 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
+ * 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:
*
- * cupsdEndProcess() - End a process.
- * cupsdFinishProcess() - Finish a process and get its name.
- * cupsdStartProcess() - Start a process.
- * compare_procs() - Compare two processes.
+ * 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 "cupsd.h"
#include <grp.h>
-#if defined(__APPLE__)
+#ifdef __APPLE__
# include <libgen.h>
#endif /* __APPLE__ */
+#ifdef HAVE_SANDBOX_H
+# define __APPLE_API_PRIVATE
+# include <sandbox.h>
+#endif /* HAVE_SANDBOX_H */
/*
typedef struct
{
- int pid; /* Process ID */
+ int pid, /* Process ID */
+ job_id; /* Job associated with process */
char name[1]; /* Name of process */
} cupsd_proc_t;
*/
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 */
+
+
+ if (!UseProfiles || RunUser)
+ {
+ /*
+ * 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);
+ }
+
+ cupsd_requote(cache, CacheDir, sizeof(cache));
+ cupsd_requote(request, RequestRoot, sizeof(request));
+ cupsd_requote(root, ServerRoot, sizeof(root));
+ cupsd_requote(temp, TempDir, sizeof(temp));
+
+ 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);
+ cupsFilePrintf(fp,
+ "(deny file-write*\n"
+ " (regex #\"^%s\" #\"^/private/etc\" #\"^/usr/local/etc\" "
+ "#\"^/Library\" #\"^/System\" #\"^/Users\"))\n", root);
+ cupsFilePrintf(fp,
+ "(allow file-write* file-read-data file-read-metadata\n"
+ " (regex #\"^%s$\" #\"^%s/\" #\"^%s$\" #\"^%s/\""
+ " #\"^/Library/Application Support/\""
+ " #\"^/Library/Caches/\""
+ " #\"^/Library/Preferences/\""
+ " #\"^/Library/Printers/\""
+ "))\n",
+ temp, temp, cache, cache);
+ cupsFilePuts(fp,
+ "(deny file-write*\n"
+ " (regex #\"^/Library/Printers/PPDs/\""
+ " #\"^/Library/Printers/PPD Plugins/\""
+ "))\n");
+ if (job_id)
+ cupsFilePrintf(fp,
+ "(allow file-read-data file-read-metadata\n"
+ " (regex #\"^%s/([ac]%05d|d%05d-[0-9][0-9][0-9])$\"))\n",
+ request, job_id, job_id);
+
+ 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 */
{
- if (force)
+ cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdEndProcess(pid=%d, force=%d)", pid,
+ force);
+
+ if (!pid)
+ return (0);
+ else if (force)
return (kill(pid, SIGKILL));
else
return (kill(pid, SIGTERM));
const char * /* O - Process name */
cupsdFinishProcess(int pid, /* I - Process ID */
char *name, /* I - Name buffer */
- int namelen) /* I - Size of 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 */
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);
-
- return (name);
}
else
- return ("unknown");
+ {
+ 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);
}
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 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__ */
- cupsdLogMessage(CUPSD_LOG_DEBUG2,
- "cupsdStartProcess(\"%s\", %p, %p, %d, %d, %d)",
- command, argv, envp, infd, outfd, errfd);
+ if (RunUser)
+ user = RunUser;
+ else if (root)
+ user = 0;
+ 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;
+
+ 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;
+ return (0);
+ }
#if defined(__APPLE__)
if (envp)
linkpath);
else
snprintf(processPath, sizeof(processPath), "CFProcessPath=%s/%s",
- dirname(command), linkpath);
+ dirname((char *)command), linkpath);
}
else
snprintf(processPath, sizeof(processPath), "CFProcessPath=%s", command);
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)
{
- close(2);
- if (errfd > 0)
- dup(errfd);
- else
- open("/dev/null", O_WRONLY);
+ if (errfd < 0)
+ errfd = open("/dev/null", O_WRONLY);
+
+ if (errfd != 2)
+ {
+ dup2(errfd, 2);
+ close(errfd);
+ }
}
- 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)
+ {
+ 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);
+#ifdef HAVE_SANDBOX_H
+ /*
+ * Run in a separate security profile...
+ */
+
+ if (profile)
+ {
+ char *error = NULL; /* Sandbox error, if any */
+
+ 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 */
+
/*
* Change user to something "safe"...
*/
* Reset group membership to just the main one we belong to.
*/
- setgid(Group);
- setgroups(1, &Group);
+ if (setgid(Group) && !RunUser)
+ exit(errno);
+
+ if (setgroups(1, &Group) && !RunUser)
+ exit(errno);
}
/*
#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();
{
if ((proc = calloc(1, sizeof(cupsd_proc_t) + strlen(command))) != NULL)
{
- proc->pid = *pid;
+ proc->pid = *pid;
+ proc->job_id = job ? job->id : 0;
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);
}
}
+#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 177 2006-06-21 00:20:03Z jlovell $".
+ * End of "$Id: process.c 7256 2008-01-25 00:48:54Z mike $".
*/
projects / thirdparty / cups.git / blobdiff