mirror of https://gitee.com/openkylin/cups.git
898 lines
24 KiB
C
898 lines
24 KiB
C
/*
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* Process management routines for the CUPS scheduler.
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*
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* Copyright © 2021-2023 by OpenPrinting.
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* Copyright © 2007-2017 by Apple Inc.
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* Copyright © 1997-2007 by Easy Software Products, all rights reserved.
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*
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* Licensed under Apache License v2.0. See the file "LICENSE" for more
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* information.
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*/
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/*
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* Include necessary headers...
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*/
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#include "cupsd.h"
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#include <grp.h>
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#ifdef __APPLE__
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# include <libgen.h>
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#endif /* __APPLE__ */
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#ifdef HAVE_POSIX_SPAWN
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# include <spawn.h>
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extern char **environ;
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/* Don't use posix_spawn on systems with bugs in their implementations... */
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# if defined(OpenBSD) && OpenBSD < 201505
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# define USE_POSIX_SPAWN 0
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# elif defined(__UCLIBC__) && __UCLIBC_MAJOR__ == 1 && __UCLIBC_MINOR__ == 0 && __UCLIBC_SUBLEVEL__ < 27
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# define USE_POSIX_SPAWN 0
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# elif defined(__UCLIBC__) && __UCLIBC_MAJOR__ < 1
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# define USE_POSIX_SPAWN 0
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# else /* All other platforms */
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# define USE_POSIX_SPAWN 1
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# endif /* ... */
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#else
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# define USE_POSIX_SPAWN 0
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#endif /* HAVE_POSIX_SPAWN */
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/*
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* Process structure...
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*/
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typedef struct
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{
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int pid, /* Process ID */
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job_id; /* Job associated with process */
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char name[1]; /* Name of process */
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} cupsd_proc_t;
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/*
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* Local globals...
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*/
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static cups_array_t *process_array = NULL;
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/*
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* Local functions...
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*/
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static int compare_procs(cupsd_proc_t *a, cupsd_proc_t *b);
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#ifdef HAVE_SANDBOX_H
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static char *cupsd_requote(char *dst, const char *src, size_t dstsize);
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#endif /* HAVE_SANDBOX_H */
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/*
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* 'cupsdCreateProfile()' - Create an execution profile for a subprocess.
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*/
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void * /* O - Profile or NULL on error */
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cupsdCreateProfile(int job_id, /* I - Job ID or 0 for none */
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int allow_networking)/* I - Allow networking off machine? */
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{
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#ifdef HAVE_SANDBOX_H
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cups_file_t *fp; /* File pointer */
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char profile[1024], /* File containing the profile */
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bin[1024], /* Quoted ServerBin */
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cache[1024], /* Quoted CacheDir */
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domain[1024], /* Domain socket, if any */
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request[1024], /* Quoted RequestRoot */
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root[1024], /* Quoted ServerRoot */
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state[1024], /* Quoted StateDir */
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temp[1024]; /* Quoted TempDir */
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const char *nodebug; /* " (with no-log)" for no debug */
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cupsd_listener_t *lis; /* Current listening socket */
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if (!UseSandboxing || Sandboxing == CUPSD_SANDBOXING_OFF)
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{
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/*
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* Only use sandbox profiles as root...
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*/
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cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d, allow_networking=%d) = NULL", job_id, allow_networking);
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return (NULL);
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}
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if ((fp = cupsTempFile2(profile, sizeof(profile))) == NULL)
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{
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/*
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* This should never happen, and is fatal when sandboxing is enabled.
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*/
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cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d, allow_networking=%d) = NULL", job_id, allow_networking);
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cupsdLogMessage(CUPSD_LOG_EMERG, "Unable to create security profile: %s", strerror(errno));
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kill(getpid(), SIGTERM);
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return (NULL);
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}
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fchown(cupsFileNumber(fp), RunUser, Group);
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fchmod(cupsFileNumber(fp), 0640);
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cupsd_requote(bin, ServerBin, sizeof(bin));
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cupsd_requote(cache, CacheDir, sizeof(cache));
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cupsd_requote(request, RequestRoot, sizeof(request));
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cupsd_requote(root, ServerRoot, sizeof(root));
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cupsd_requote(state, StateDir, sizeof(state));
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cupsd_requote(temp, TempDir, sizeof(temp));
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nodebug = LogLevel < CUPSD_LOG_DEBUG ? " (with no-log)" : "";
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cupsFilePuts(fp, "(version 1)\n");
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if (Sandboxing == CUPSD_SANDBOXING_STRICT)
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cupsFilePuts(fp, "(deny default)\n");
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else
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cupsFilePuts(fp, "(allow default)\n");
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if (LogLevel >= CUPSD_LOG_DEBUG)
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cupsFilePuts(fp, "(debug deny)\n");
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cupsFilePuts(fp, "(import \"system.sb\")\n");
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cupsFilePuts(fp, "(import \"com.apple.corefoundation.sb\")\n");
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cupsFilePuts(fp, "(system-network)\n");
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cupsFilePuts(fp, "(allow mach-per-user-lookup)\n");
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cupsFilePuts(fp, "(allow ipc-posix-sem)\n");
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cupsFilePuts(fp, "(allow ipc-posix-shm)\n");
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cupsFilePuts(fp, "(allow ipc-sysv-shm)\n");
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cupsFilePuts(fp, "(allow mach-lookup)\n");
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if (!RunUser)
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cupsFilePrintf(fp,
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"(deny file-write* file-read-data file-read-metadata\n"
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" (regex"
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" #\"^/Users$\""
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" #\"^/Users/\""
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")%s)\n", nodebug);
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cupsFilePrintf(fp,
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"(deny file-write*\n"
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" (regex"
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" #\"^%s$\"" /* ServerRoot */
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" #\"^%s/\"" /* ServerRoot/... */
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" #\"^/private/etc$\""
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" #\"^/private/etc/\""
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" #\"^/usr/local/etc$\""
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" #\"^/usr/local/etc/\""
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" #\"^/Library$\""
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" #\"^/Library/\""
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" #\"^/System$\""
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" #\"^/System/\""
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")%s)\n",
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root, root, nodebug);
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/* Specifically allow applications to stat RequestRoot and some other system folders */
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cupsFilePrintf(fp,
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"(allow file-read-metadata\n"
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" (regex"
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" #\"^/$\"" /* / */
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" #\"^/usr$\"" /* /usr */
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" #\"^/Library$\"" /* /Library */
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" #\"^/Library/Printers$\"" /* /Library/Printers */
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" #\"^%s$\"" /* RequestRoot */
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"))\n",
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request);
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/* Read and write TempDir, CacheDir, and other common folders */
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cupsFilePuts(fp,
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"(allow file-write* file-read-data file-read-metadata\n"
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" (regex"
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" #\"^/private/var/db/\""
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" #\"^/private/var/folders/\""
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" #\"^/private/var/lib/\""
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" #\"^/private/var/log/\""
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" #\"^/private/var/mysql/\""
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" #\"^/private/var/run/\""
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" #\"^/private/var/spool/\""
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" #\"^/Library/Application Support/\""
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" #\"^/Library/Caches/\""
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" #\"^/Library/Logs/\""
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" #\"^/Library/Preferences/\""
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" #\"^/Library/WebServer/\""
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" #\"^/Users/Shared/\""
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"))\n");
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cupsFilePrintf(fp,
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"(deny file-write*\n"
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" (regex #\"^%s$\")%s)\n",
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request, nodebug);
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cupsFilePrintf(fp,
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"(deny file-write* file-read-data file-read-metadata\n"
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" (regex #\"^%s/\")%s)\n",
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request, nodebug);
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cupsFilePrintf(fp,
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"(allow file-write* file-read-data file-read-metadata\n"
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" (regex"
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" #\"^%s$\"" /* TempDir */
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" #\"^%s/\"" /* TempDir/... */
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" #\"^%s$\"" /* CacheDir */
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" #\"^%s/\"" /* CacheDir/... */
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"))\n",
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temp, temp, cache, cache);
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/* Read common folders */
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cupsFilePrintf(fp,
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"(allow file-read-data file-read-metadata\n"
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" (regex"
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" #\"^/AppleInternal$\""
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" #\"^/AppleInternal/\""
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" #\"^/bin$\"" /* /bin */
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" #\"^/bin/\"" /* /bin/... */
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" #\"^/private$\""
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" #\"^/private/etc$\""
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" #\"^/private/etc/\""
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" #\"^/private/tmp$\""
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" #\"^/private/tmp/\""
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" #\"^/private/var$\""
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" #\"^/private/var/db$\""
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" #\"^/private/var/folders$\""
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" #\"^/private/var/lib$\""
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" #\"^/private/var/log$\""
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" #\"^/private/var/mysql$\""
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" #\"^/private/var/run$\""
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" #\"^/private/var/spool$\""
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" #\"^/private/var/tmp$\""
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" #\"^/private/var/tmp/\""
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" #\"^/usr/bin$\"" /* /usr/bin */
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" #\"^/usr/bin/\"" /* /usr/bin/... */
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" #\"^/usr/libexec/cups$\"" /* /usr/libexec/cups */
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" #\"^/usr/libexec/cups/\"" /* /usr/libexec/cups/... */
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" #\"^/usr/libexec/fax$\"" /* /usr/libexec/fax */
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" #\"^/usr/libexec/fax/\"" /* /usr/libexec/fax/... */
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" #\"^/usr/sbin$\"" /* /usr/sbin */
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" #\"^/usr/sbin/\"" /* /usr/sbin/... */
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" #\"^/Library$\"" /* /Library */
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" #\"^/Library/\"" /* /Library/... */
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" #\"^/System$\"" /* /System */
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" #\"^/System/\"" /* /System/... */
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" #\"^%s/Library$\"" /* RequestRoot/Library */
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" #\"^%s/Library/\"" /* RequestRoot/Library/... */
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" #\"^%s$\"" /* ServerBin */
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" #\"^%s/\"" /* ServerBin/... */
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" #\"^%s$\"" /* ServerRoot */
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" #\"^%s/\"" /* ServerRoot/... */
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" #\"^%s$\"" /* StateDir */
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" #\"^%s/\"" /* StateDir/... */
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"))\n",
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request, request, bin, bin, root, root, state, state);
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if (Sandboxing == CUPSD_SANDBOXING_RELAXED)
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{
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/* Limited write access to /Library/Printers/... */
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cupsFilePuts(fp,
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"(allow file-write*\n"
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" (regex"
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" #\"^/Library/Printers/.*/\""
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"))\n");
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cupsFilePrintf(fp,
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"(deny file-write*\n"
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" (regex"
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" #\"^/Library/Printers/PPDs$\""
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" #\"^/Library/Printers/PPDs/\""
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" #\"^/Library/Printers/PPD Plugins$\""
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" #\"^/Library/Printers/PPD Plugins/\""
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")%s)\n", nodebug);
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}
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/* Allow execution of child processes as long as the programs are not in a user directory */
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cupsFilePuts(fp, "(allow process*)\n");
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cupsFilePuts(fp, "(deny process-exec (regex #\"^/Users/\"))\n");
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if (RunUser && getenv("CUPS_TESTROOT"))
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{
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/* Allow source directory access in "make test" environment */
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char testroot[1024]; /* Root directory of test files */
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cupsd_requote(testroot, getenv("CUPS_TESTROOT"), sizeof(testroot));
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cupsFilePrintf(fp,
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"(allow file-write* file-read-data file-read-metadata\n"
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" (regex"
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" #\"^%s$\"" /* CUPS_TESTROOT */
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" #\"^%s/\"" /* CUPS_TESTROOT/... */
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"))\n",
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testroot, testroot);
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cupsFilePrintf(fp,
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"(allow process-exec\n"
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" (regex"
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" #\"^%s/\"" /* CUPS_TESTROOT/... */
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"))\n",
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testroot);
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cupsFilePrintf(fp, "(allow sysctl*)\n");
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}
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if (job_id)
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{
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/* Allow job filters to read the current job files... */
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cupsFilePrintf(fp,
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"(allow file-read-data file-read-metadata\n"
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" (regex #\"^%s/([ac]%05d|d%05d-[0-9][0-9][0-9])$\"))\n",
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request, job_id, job_id);
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}
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else
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{
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/* Allow email notifications from notifiers... */
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cupsFilePuts(fp,
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"(allow process-exec\n"
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" (literal \"/usr/sbin/sendmail\")\n"
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" (with no-sandbox))\n");
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}
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/* Allow access to Bluetooth, USB, and notify_post. */
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cupsFilePuts(fp, "(allow iokit*)\n");
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cupsFilePuts(fp, "(allow distributed-notification-post)\n");
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/* Allow outbound networking to local services */
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cupsFilePuts(fp, "(allow network-outbound"
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"\n (regex #\"^/private/var/run/\" #\"^/private/tmp/\" #\"^/private/var/tmp/\")");
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for (lis = (cupsd_listener_t *)cupsArrayFirst(Listeners);
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lis;
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lis = (cupsd_listener_t *)cupsArrayNext(Listeners))
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{
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if (httpAddrFamily(&(lis->address)) == AF_LOCAL)
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{
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httpAddrString(&(lis->address), domain, sizeof(domain));
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cupsFilePrintf(fp, "\n (literal \"%s\")", domain);
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}
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}
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if (allow_networking)
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{
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/* Allow TCP and UDP networking off the machine... */
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cupsFilePuts(fp, "\n (remote tcp))\n");
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cupsFilePuts(fp, "(allow network-bind)\n"); /* for LPD resvport */
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cupsFilePuts(fp, "(allow network*\n"
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" (local udp \"*:*\")\n"
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" (remote udp \"*:*\"))\n");
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/* Also allow access to device files... */
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cupsFilePuts(fp, "(allow file-write* file-read-data file-read-metadata file-ioctl\n"
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" (regex #\"^/dev/\"))\n");
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/* And allow kernel extensions to be loaded, e.g., SMB */
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cupsFilePuts(fp, "(allow system-kext-load)\n");
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}
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else
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{
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/* Only allow SNMP (UDP) and LPD (TCP) off the machine... */
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cupsFilePuts(fp, ")\n");
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cupsFilePuts(fp, "(allow network-outbound\n"
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" (remote udp \"*:161\")\n"
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" (remote tcp \"*:515\"))\n");
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cupsFilePuts(fp, "(allow network-inbound\n"
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" (local udp \"localhost:*\"))\n");
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}
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cupsFileClose(fp);
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cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d,allow_networking=%d) = \"%s\"", job_id, allow_networking, profile);
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return ((void *)strdup(profile));
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#else
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cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d, allow_networking=%d) = NULL", job_id, allow_networking);
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return (NULL);
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#endif /* HAVE_SANDBOX_H */
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}
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/*
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* 'cupsdDestroyProfile()' - Delete an execution profile.
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*/
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void
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cupsdDestroyProfile(void *profile) /* I - Profile */
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{
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cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdDeleteProfile(profile=\"%s\")",
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profile ? (char *)profile : "(null)");
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#ifdef HAVE_SANDBOX_H
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if (profile)
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{
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unlink((char *)profile);
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free(profile);
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}
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#endif /* HAVE_SANDBOX_H */
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}
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/*
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* 'cupsdEndProcess()' - End a process.
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*/
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int /* O - 0 on success, -1 on failure */
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cupsdEndProcess(int pid, /* I - Process ID */
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int force) /* I - Force child to die */
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{
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cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdEndProcess(pid=%d, force=%d)", pid,
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force);
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if (!pid)
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return (0);
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if (!RunUser)
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{
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/*
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* When running as root, cupsd puts child processes in their own process
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* group. Using "-pid" sends a signal to all processes in the group.
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*/
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pid = -pid;
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}
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if (force)
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return (kill(pid, SIGKILL));
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else
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return (kill(pid, SIGTERM));
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}
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/*
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* 'cupsdFinishProcess()' - Finish a process and get its name.
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*/
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const char * /* O - Process name */
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cupsdFinishProcess(int pid, /* I - Process ID */
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char *name, /* I - Name buffer */
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size_t namelen, /* I - Size of name buffer */
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int *job_id) /* O - Job ID pointer or NULL */
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{
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cupsd_proc_t key, /* Search key */
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*proc; /* Matching process */
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key.pid = pid;
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if ((proc = (cupsd_proc_t *)cupsArrayFind(process_array, &key)) != NULL)
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{
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if (job_id)
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*job_id = proc->job_id;
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strlcpy(name, proc->name, namelen);
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cupsArrayRemove(process_array, proc);
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free(proc);
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}
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else
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{
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if (job_id)
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*job_id = 0;
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strlcpy(name, "unknown", namelen);
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}
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cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdFinishProcess(pid=%d, name=%p, namelen=" CUPS_LLFMT ", job_id=%p(%d)) = \"%s\"", pid, name, CUPS_LLCAST namelen, job_id, job_id ? *job_id : 0, name);
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return (name);
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}
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/*
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* 'cupsdStartProcess()' - Start a process.
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*/
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int /* O - Process ID or 0 */
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cupsdStartProcess(
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const char *command, /* I - Full path to command */
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char *argv[], /* I - Command-line arguments */
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char *envp[], /* I - Environment */
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int infd, /* I - Standard input file descriptor */
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int outfd, /* I - Standard output file descriptor */
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int errfd, /* I - Standard error file descriptor */
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int backfd, /* I - Backchannel file descriptor */
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int sidefd, /* I - Sidechannel file descriptor */
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int root, /* I - Run as root? */
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void *profile, /* I - Security profile to use */
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cupsd_job_t *job, /* I - Job associated with process */
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int *pid) /* O - Process ID */
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{
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int i; /* Looping var */
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const char *exec_path = command; /* Command to be exec'd */
|
||
char *real_argv[110], /* Real command-line arguments */
|
||
cups_exec[1024], /* Path to "cups-exec" program */
|
||
user_str[16], /* User string */
|
||
group_str[16], /* Group string */
|
||
nice_str[16]; /* FilterNice string */
|
||
uid_t user; /* Command UID */
|
||
cupsd_proc_t *proc; /* New process record */
|
||
#if USE_POSIX_SPAWN
|
||
posix_spawn_file_actions_t actions; /* Spawn file actions */
|
||
posix_spawnattr_t attrs; /* Spawn attributes */
|
||
sigset_t defsignals; /* Default signals */
|
||
#elif defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET)
|
||
struct sigaction action; /* POSIX signal handler */
|
||
#endif /* USE_POSIX_SPAWN */
|
||
#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 macOS - this allows macOS 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 !USE_POSIX_SPAWN
|
||
if (profile)
|
||
#endif /* !USE_POSIX_SPAWN */
|
||
{
|
||
snprintf(cups_exec, sizeof(cups_exec), "%s/daemon/cups-exec", ServerBin);
|
||
snprintf(user_str, sizeof(user_str), "%d", user);
|
||
snprintf(group_str, sizeof(group_str), "%d", Group);
|
||
snprintf(nice_str, sizeof(nice_str), "%d", FilterNice);
|
||
|
||
real_argv[0] = cups_exec;
|
||
real_argv[1] = (char *)"-g";
|
||
real_argv[2] = group_str;
|
||
real_argv[3] = (char *)"-n";
|
||
real_argv[4] = nice_str;
|
||
real_argv[5] = (char *)"-u";
|
||
real_argv[6] = user_str;
|
||
real_argv[7] = profile ? profile : "none";
|
||
real_argv[8] = (char *)command;
|
||
|
||
for (i = 0;
|
||
i < (int)(sizeof(real_argv) / sizeof(real_argv[0]) - 10) && argv[i];
|
||
i ++)
|
||
real_argv[i + 9] = argv[i];
|
||
|
||
real_argv[i + 9] = NULL;
|
||
|
||
argv = real_argv;
|
||
exec_path = cups_exec;
|
||
}
|
||
|
||
if (LogLevel == CUPSD_LOG_DEBUG2)
|
||
{
|
||
cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Preparing to start \"%s\", arguments:", command);
|
||
|
||
for (i = 0; argv[i]; i ++)
|
||
cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: argv[%d] = \"%s\"", i, argv[i]);
|
||
}
|
||
|
||
#if USE_POSIX_SPAWN
|
||
/*
|
||
* Setup attributes and file actions for the spawn...
|
||
*/
|
||
|
||
cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Setting spawn attributes.");
|
||
sigemptyset(&defsignals);
|
||
sigaddset(&defsignals, SIGTERM);
|
||
sigaddset(&defsignals, SIGCHLD);
|
||
sigaddset(&defsignals, SIGPIPE);
|
||
|
||
posix_spawnattr_init(&attrs);
|
||
posix_spawnattr_setflags(&attrs, POSIX_SPAWN_SETPGROUP | POSIX_SPAWN_SETSIGDEF);
|
||
posix_spawnattr_setpgroup(&attrs, 0);
|
||
posix_spawnattr_setsigdefault(&attrs, &defsignals);
|
||
|
||
cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Setting file actions.");
|
||
posix_spawn_file_actions_init(&actions);
|
||
if (infd != 0)
|
||
{
|
||
if (infd < 0)
|
||
posix_spawn_file_actions_addopen(&actions, 0, "/dev/null", O_RDONLY, 0);
|
||
else
|
||
posix_spawn_file_actions_adddup2(&actions, infd, 0);
|
||
}
|
||
|
||
if (outfd != 1)
|
||
{
|
||
if (outfd < 0)
|
||
posix_spawn_file_actions_addopen(&actions, 1, "/dev/null", O_WRONLY, 0);
|
||
else
|
||
posix_spawn_file_actions_adddup2(&actions, outfd, 1);
|
||
}
|
||
|
||
if (errfd != 2)
|
||
{
|
||
if (errfd < 0)
|
||
posix_spawn_file_actions_addopen(&actions, 2, "/dev/null", O_WRONLY, 0);
|
||
else
|
||
posix_spawn_file_actions_adddup2(&actions, errfd, 2);
|
||
}
|
||
|
||
if (backfd != 3 && backfd >= 0)
|
||
posix_spawn_file_actions_adddup2(&actions, backfd, 3);
|
||
|
||
if (sidefd != 4 && sidefd >= 0)
|
||
posix_spawn_file_actions_adddup2(&actions, sidefd, 4);
|
||
|
||
cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Calling posix_spawn.");
|
||
|
||
if (posix_spawn(pid, exec_path, &actions, &attrs, argv, envp ? envp : environ))
|
||
{
|
||
cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to fork %s - %s.", command, strerror(errno));
|
||
|
||
*pid = 0;
|
||
}
|
||
else
|
||
cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: pid=%d", (int)*pid);
|
||
|
||
posix_spawn_file_actions_destroy(&actions);
|
||
posix_spawnattr_destroy(&attrs);
|
||
|
||
#else
|
||
/*
|
||
* 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 CUPS_SNAP
|
||
if (!RunUser && setgroups(0, NULL))
|
||
# else
|
||
if (!RunUser && setgroups(1, &Group))
|
||
# endif /* CUPS_SNAP */
|
||
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;
|
||
}
|
||
|
||
cupsdReleaseSignals();
|
||
#endif /* USE_POSIX_SPAWN */
|
||
|
||
if (*pid)
|
||
{
|
||
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);
|
||
}
|
||
}
|
||
}
|
||
|
||
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 (ch == '/' && !*src)
|
||
break; /* Don't add trailing slash */
|
||
|
||
if (strchr(".?*()[]^$\\\"", ch))
|
||
*dstptr++ = '\\';
|
||
|
||
*dstptr++ = (char)ch;
|
||
}
|
||
|
||
*dstptr = '\0';
|
||
|
||
return (dst);
|
||
}
|
||
#endif /* HAVE_SANDBOX_H */
|