* [patch] udev-selinux: restores file security context and sets mode in matchpathcon @ 2004-08-03 15:26 ` Luke Kenneth Casson Leighton 0 siblings, 0 replies; 5+ messages in thread From: Luke Kenneth Casson Leighton @ 2004-08-03 15:26 UTC (permalink / raw) To: SE-Linux, Linux Hotplug Dev List okay, updated. this is an experimental patch. - records former security context - assumes any file creates (directories, symlinks, nodes) are hunky-dory and going to be the only file creates - restores former security context. matchpathcon mode on: - directories (for the mkdirs) uses S_IFDIR - inodes (for the mknod) uses the mode passed in. - symlinks uses S_IFDIR the reason for using this patch is because of speed: if matchpathcon is used in the same process, the lookups etc. are cached. a reason for _not_ using this patch is for a udev in initrd where the smaller klibc is used. it would be necessary to add rexeg to klibc and to compile a special libselinux1 with it. if you do not intend to put udev into an initrd, this patch is perfectly acceptable for use. l. ------------------------------------------------------- This SF.Net email is sponsored by OSTG. Have you noticed the changes on Linux.com, ITManagersJournal and NewsForge in the past few weeks? Now, one more big change to announce. We are now OSTG- Open Source Technology Group. Come see the changes on the new OSTG site. www.ostg.com _______________________________________________ Linux-hotplug-devel mailing list http://linux-hotplug.sourceforge.net Linux-hotplug-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel ^ permalink raw reply [flat|nested] 5+ messages in thread
* [patch] udev-selinux: restores file security context and sets mode in matchpathcon @ 2004-08-03 15:26 ` Luke Kenneth Casson Leighton 0 siblings, 0 replies; 5+ messages in thread From: Luke Kenneth Casson Leighton @ 2004-08-03 15:26 UTC (permalink / raw) To: SE-Linux, Linux Hotplug Dev List okay, updated. this is an experimental patch. - records former security context - assumes any file creates (directories, symlinks, nodes) are hunky-dory and going to be the only file creates - restores former security context. matchpathcon mode on: - directories (for the mkdirs) uses S_IFDIR - inodes (for the mknod) uses the mode passed in. - symlinks uses S_IFDIR the reason for using this patch is because of speed: if matchpathcon is used in the same process, the lookups etc. are cached. a reason for _not_ using this patch is for a udev in initrd where the smaller klibc is used. it would be necessary to add rexeg to klibc and to compile a special libselinux1 with it. if you do not intend to put udev into an initrd, this patch is perfectly acceptable for use. l. -- This message was distributed to subscribers of the selinux mailing list. If you no longer wish to subscribe, send mail to majordomo@tycho.nsa.gov with the words "unsubscribe selinux" without quotes as the message. ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [patch] udev-selinux: restores file security context and sets 2004-08-03 15:26 ` Luke Kenneth Casson Leighton (?) @ 2004-08-04 9:33 ` Hannes Reinecke 2004-08-04 11:09 ` Luke Kenneth Casson Leighton -1 siblings, 1 reply; 5+ messages in thread From: Hannes Reinecke @ 2004-08-04 9:33 UTC (permalink / raw) To: linux-hotplug Luke Kenneth Casson Leighton wrote: > okay, updated. > > this is an experimental patch. > [ .. ] > the reason for using this patch is because of speed: > if matchpathcon is used in the same process, the lookups etc. > are cached. > > a reason for _not_ using this patch is for a udev in initrd > where the smaller klibc is used. it would be necessary to add > rexeg to klibc and to compile a special libselinux1 with it. > > if you do not intend to put udev into an initrd, this patch is > perfectly acceptable for use. > > l. So where is it then? Cheers, Hannes -- Dr. Hannes Reinecke hare@suse.de SuSE Linux AG S390 & zSeries Maxfeldstraße 5 +49 911 74053 688 90409 Nürnberg http://www.suse.de ------------------------------------------------------- This SF.Net email is sponsored by OSTG. Have you noticed the changes on Linux.com, ITManagersJournal and NewsForge in the past few weeks? Now, one more big change to announce. We are now OSTG- Open Source Technology Group. Come see the changes on the new OSTG site. www.ostg.com _______________________________________________ Linux-hotplug-devel mailing list http://linux-hotplug.sourceforge.net Linux-hotplug-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [patch] udev-selinux: restores file security context and sets mode in matchpathcon 2004-08-04 9:33 ` [patch] udev-selinux: restores file security context and sets Hannes Reinecke @ 2004-08-04 11:09 ` Luke Kenneth Casson Leighton 0 siblings, 0 replies; 5+ messages in thread From: Luke Kenneth Casson Leighton @ 2004-08-04 11:09 UTC (permalink / raw) To: Hannes Reinecke; +Cc: SE-Linux, Linux Hotplug Dev List [-- Attachment #1: Type: text/plain, Size: 1237 bytes --] duh! On Wed, Aug 04, 2004 at 11:33:07AM +0200, Hannes Reinecke wrote: > Luke Kenneth Casson Leighton wrote: > >okay, updated. > > > >this is an experimental patch. > > > [ .. ] > >the reason for using this patch is because of speed: > >if matchpathcon is used in the same process, the lookups etc. > >are cached. > > > >a reason for _not_ using this patch is for a udev in initrd > >where the smaller klibc is used. it would be necessary to add > >rexeg to klibc and to compile a special libselinux1 with it. > > > >if you do not intend to put udev into an initrd, this patch is > >perfectly acceptable for use. > > > >l. > So where is it then? > > Cheers, > > Hannes > -- > Dr. Hannes Reinecke hare@suse.de > SuSE Linux AG S390 & zSeries > Maxfeldstra?e 5 +49 911 74053 688 > 90409 N?rnberg http://www.suse.de -- -- Information I post is with honesty, integrity, and the expectation that you will take full responsibility if acting on the information contained, and that, should you find it to be flawed or even mildly useful, you will act with both honesty and integrity in return - and tell me. -- <a href="http://lkcl.net"> lkcl.net </a> <br /> <a href="mailto:lkcl@lkcl.net"> lkcl@lkcl.net </a> <br /> [-- Attachment #2: f --] [-- Type: text/plain, Size: 5770 bytes --] --- udev-add.c.orig 2004-07-09 18:59:09.000000000 +0100 +++ udev-add.c 2004-08-03 16:21:59.000000000 +0100 @@ -50,6 +50,10 @@ #define LOCAL_USER "$local" +#ifdef WITH_SELINUX +#include <selinux/selinux.h> +#endif + /* * Right now the major/minor of a device is stored in a file called * "dev" in sysfs. @@ -92,7 +96,31 @@ break; *pos = 0x00; if (stat(p, &stats)) { +#ifdef WITH_SELINUX + int seretval = 0; + security_context_t scontext; + if (is_selinux_enabled() > 0) + { + seretval = matchpathcon(p, S_IFDIR, &scontext); + if (seretval < 0) { + dbg("matchpathcon(%s) failed\n", p); + } else { + seretval=setfscreatecon(scontext); + if (seretval < 0) + dbg("setfiles %s failed with error '%s'", + p, strerror(errno)); + } + } +#endif retval = mkdir(p, 0755); +#ifdef WITH_SELINUX + if (is_selinux_enabled() > 0) + { + /* after mkdir, free the context */ + freecon(scontext); + } +#endif + if (retval != 0) { dbg("mkdir(%s) failed with error '%s'", p, strerror(errno)); @@ -109,6 +137,10 @@ { struct stat stats; int retval = 0; + int seretval = 0; +#ifdef WITH_SELINUX + security_context_t scontext; +#endif if (stat(file, &stats) != 0) goto create; @@ -117,6 +149,24 @@ if (((stats.st_mode & S_IFMT) == S_IFBLK || (stats.st_mode & S_IFMT) == S_IFCHR) && (stats.st_rdev == makedev(major, minor))) { dbg("preserve file '%s', cause it has correct dev_t", file); +#ifdef WITH_SELINUX + /* lkcl: maybe someone would like to do the same thing with se/linux + * security contexts (check they are the same) but hey, not me! + */ + if (is_selinux_enabled() > 0) + { + retval = matchpathcon(file, mode, &scontext); + if (retval < 0) { + dbg("matchpathcon(%s) failed\n", file); + } else { + retval=setfilecon(scontext, file); + if (retval < 0) + dbg("setfiles %s failed with error '%s'", + file, strerror(errno)); + freecon(scontext); + } + } +#endif goto perms; } @@ -126,6 +176,21 @@ dbg("already present file '%s' unlinked", file); create: +#ifdef WITH_SELINUX + if (is_selinux_enabled() > 0) + { + seretval = matchpathcon(file, mode, &scontext); + if (seretval < 0) { + dbg("matchpathcon(%s) failed\n", file); + } else { + retval=setfscreatecon(scontext); + if (retval < 0) + dbg("setfiles %s failed with error '%s'", + file, strerror(errno)); + } + } +#endif + retval = mknod(file, mode, makedev(major, minor)); if (retval != 0) { dbg("mknod(%s, %#o, %u, %u) failed with error '%s'", @@ -133,6 +198,15 @@ goto exit; } +#ifdef WITH_SELINUX + if (is_selinux_enabled() > 0) + { + /* after mknod, free the context */ + if (seretval == 0) + freecon(scontext); + } +#endif + perms: dbg("chmod(%s, %#o)", file, mode); if (chmod(file, mode) != 0) { @@ -150,7 +224,11 @@ } exit: +#ifdef WITH_SELINUX + return retval < 0 ? retval : seretval; +#else return retval; +#endif } /* get the local logged in user */ @@ -304,10 +382,36 @@ dbg("symlink(%s, %s)", linktarget, filename); if (!fake) { +#ifdef WITH_SELINUX + int seretval = 0; + security_context_t scontext; + if (is_selinux_enabled() > 0) + { + seretval = matchpathcon(filename, S_IFLNK, &scontext); + if (seretval < 0) { + dbg("matchpathcon(%s) failed\n", filename); + } else { + seretval=setfscreatecon(scontext); + if (seretval < 0) + dbg("setfiles %s failed with error '%s'", + filename, strerror(errno)); + } + } +#endif + + unlink(filename); if (symlink(linktarget, filename) != 0) dbg("symlink(%s, %s) failed with error '%s'", linktarget, filename, strerror(errno)); +#ifdef WITH_SELINUX + if (is_selinux_enabled() > 0) + { + /* after symlink, free the context */ + freecon(scontext); + } +#endif + } } @@ -403,6 +507,11 @@ char *pos; int retval; +#ifdef WITH_SELINUX + int seretval; + security_context_t prev_scontext; +#endif + memset(&dev, 0x00, sizeof(dev)); dev.type = get_device_type(path, subsystem); @@ -438,6 +547,23 @@ dbg("name='%s'", dev.name); +#ifdef WITH_SELINUX + /* record the present security context, for file-creation + * restoration creation purposes. + * + * we're going to assume that between now and the time that + * this context is restored that the only filecreation of any + * kind to occur will be mknod, symlink and mkdirs. + */ + + if (is_selinux_enabled() > 0) + { + seretval = getfscreatecon(&prev_scontext); + if (seretval < 0) { + dbg("getfscreatecon failed\n"); + } + } +#endif switch (dev.type) { case 'b': case 'c': @@ -474,6 +600,16 @@ break; } +#ifdef WITH_SELINUX + if (is_selinux_enabled() > 0) + { + /* reset the file create context to its former glory */ + if (seretval == 0) + seretval=setfscreatecon(prev_scontext); + freecon(prev_scontext); + } +#endif + exit: sysfs_close_class_device(class_dev); --- Makefile.orig 2004-08-02 22:23:58.000000000 +0100 +++ Makefile 2004-08-02 22:24:01.000000000 +0100 @@ -25,6 +25,8 @@ # Leave this set to `false' for production use. DEBUG = true +# Set this to compile with Security-Enhanced Linux support. +WITH_SELINUX = true ROOT = udev DAEMON = udevd @@ -39,6 +41,7 @@ LOCAL_CFG_DIR = etc/udev HOTPLUG_EXEC = $(ROOT) + DESTDIR = KERNEL_DIR = /lib/modules/${shell uname -r}/build @@ -172,6 +175,13 @@ CFLAGS += -I$(PWD)/libsysfs +ifeq ($(strip $(WITH_SELINUX)),true) + LIB_OBJS += \ + -lselinux + CFLAGS += \ + -DWITH_SELINUX +endif + all: $(ROOT) $(SENDER) $(DAEMON) $(INFO) $(TESTER) $(STARTER) @extras="$(EXTRAS)" ; for target in $$extras ; do \ echo $$target ; \ ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [patch] udev-selinux: restores file security context and sets mode in matchpathcon @ 2004-08-04 11:09 ` Luke Kenneth Casson Leighton 0 siblings, 0 replies; 5+ messages in thread From: Luke Kenneth Casson Leighton @ 2004-08-04 11:09 UTC (permalink / raw) To: Hannes Reinecke; +Cc: SE-Linux, Linux Hotplug Dev List [-- Attachment #1: Type: text/plain, Size: 1237 bytes --] duh! On Wed, Aug 04, 2004 at 11:33:07AM +0200, Hannes Reinecke wrote: > Luke Kenneth Casson Leighton wrote: > >okay, updated. > > > >this is an experimental patch. > > > [ .. ] > >the reason for using this patch is because of speed: > >if matchpathcon is used in the same process, the lookups etc. > >are cached. > > > >a reason for _not_ using this patch is for a udev in initrd > >where the smaller klibc is used. it would be necessary to add > >rexeg to klibc and to compile a special libselinux1 with it. > > > >if you do not intend to put udev into an initrd, this patch is > >perfectly acceptable for use. > > > >l. > So where is it then? > > Cheers, > > Hannes > -- > Dr. Hannes Reinecke hare@suse.de > SuSE Linux AG S390 & zSeries > Maxfeldstra?e 5 +49 911 74053 688 > 90409 N?rnberg http://www.suse.de -- -- Information I post is with honesty, integrity, and the expectation that you will take full responsibility if acting on the information contained, and that, should you find it to be flawed or even mildly useful, you will act with both honesty and integrity in return - and tell me. -- <a href="http://lkcl.net"> lkcl.net </a> <br /> <a href="mailto:lkcl@lkcl.net"> lkcl@lkcl.net </a> <br /> [-- Attachment #2: f --] [-- Type: text/plain, Size: 5770 bytes --] --- udev-add.c.orig 2004-07-09 18:59:09.000000000 +0100 +++ udev-add.c 2004-08-03 16:21:59.000000000 +0100 @@ -50,6 +50,10 @@ #define LOCAL_USER "$local" +#ifdef WITH_SELINUX +#include <selinux/selinux.h> +#endif + /* * Right now the major/minor of a device is stored in a file called * "dev" in sysfs. @@ -92,7 +96,31 @@ break; *pos = 0x00; if (stat(p, &stats)) { +#ifdef WITH_SELINUX + int seretval = 0; + security_context_t scontext; + if (is_selinux_enabled() > 0) + { + seretval = matchpathcon(p, S_IFDIR, &scontext); + if (seretval < 0) { + dbg("matchpathcon(%s) failed\n", p); + } else { + seretval=setfscreatecon(scontext); + if (seretval < 0) + dbg("setfiles %s failed with error '%s'", + p, strerror(errno)); + } + } +#endif retval = mkdir(p, 0755); +#ifdef WITH_SELINUX + if (is_selinux_enabled() > 0) + { + /* after mkdir, free the context */ + freecon(scontext); + } +#endif + if (retval != 0) { dbg("mkdir(%s) failed with error '%s'", p, strerror(errno)); @@ -109,6 +137,10 @@ { struct stat stats; int retval = 0; + int seretval = 0; +#ifdef WITH_SELINUX + security_context_t scontext; +#endif if (stat(file, &stats) != 0) goto create; @@ -117,6 +149,24 @@ if (((stats.st_mode & S_IFMT) == S_IFBLK || (stats.st_mode & S_IFMT) == S_IFCHR) && (stats.st_rdev == makedev(major, minor))) { dbg("preserve file '%s', cause it has correct dev_t", file); +#ifdef WITH_SELINUX + /* lkcl: maybe someone would like to do the same thing with se/linux + * security contexts (check they are the same) but hey, not me! + */ + if (is_selinux_enabled() > 0) + { + retval = matchpathcon(file, mode, &scontext); + if (retval < 0) { + dbg("matchpathcon(%s) failed\n", file); + } else { + retval=setfilecon(scontext, file); + if (retval < 0) + dbg("setfiles %s failed with error '%s'", + file, strerror(errno)); + freecon(scontext); + } + } +#endif goto perms; } @@ -126,6 +176,21 @@ dbg("already present file '%s' unlinked", file); create: +#ifdef WITH_SELINUX + if (is_selinux_enabled() > 0) + { + seretval = matchpathcon(file, mode, &scontext); + if (seretval < 0) { + dbg("matchpathcon(%s) failed\n", file); + } else { + retval=setfscreatecon(scontext); + if (retval < 0) + dbg("setfiles %s failed with error '%s'", + file, strerror(errno)); + } + } +#endif + retval = mknod(file, mode, makedev(major, minor)); if (retval != 0) { dbg("mknod(%s, %#o, %u, %u) failed with error '%s'", @@ -133,6 +198,15 @@ goto exit; } +#ifdef WITH_SELINUX + if (is_selinux_enabled() > 0) + { + /* after mknod, free the context */ + if (seretval == 0) + freecon(scontext); + } +#endif + perms: dbg("chmod(%s, %#o)", file, mode); if (chmod(file, mode) != 0) { @@ -150,7 +224,11 @@ } exit: +#ifdef WITH_SELINUX + return retval < 0 ? retval : seretval; +#else return retval; +#endif } /* get the local logged in user */ @@ -304,10 +382,36 @@ dbg("symlink(%s, %s)", linktarget, filename); if (!fake) { +#ifdef WITH_SELINUX + int seretval = 0; + security_context_t scontext; + if (is_selinux_enabled() > 0) + { + seretval = matchpathcon(filename, S_IFLNK, &scontext); + if (seretval < 0) { + dbg("matchpathcon(%s) failed\n", filename); + } else { + seretval=setfscreatecon(scontext); + if (seretval < 0) + dbg("setfiles %s failed with error '%s'", + filename, strerror(errno)); + } + } +#endif + + unlink(filename); if (symlink(linktarget, filename) != 0) dbg("symlink(%s, %s) failed with error '%s'", linktarget, filename, strerror(errno)); +#ifdef WITH_SELINUX + if (is_selinux_enabled() > 0) + { + /* after symlink, free the context */ + freecon(scontext); + } +#endif + } } @@ -403,6 +507,11 @@ char *pos; int retval; +#ifdef WITH_SELINUX + int seretval; + security_context_t prev_scontext; +#endif + memset(&dev, 0x00, sizeof(dev)); dev.type = get_device_type(path, subsystem); @@ -438,6 +547,23 @@ dbg("name='%s'", dev.name); +#ifdef WITH_SELINUX + /* record the present security context, for file-creation + * restoration creation purposes. + * + * we're going to assume that between now and the time that + * this context is restored that the only filecreation of any + * kind to occur will be mknod, symlink and mkdirs. + */ + + if (is_selinux_enabled() > 0) + { + seretval = getfscreatecon(&prev_scontext); + if (seretval < 0) { + dbg("getfscreatecon failed\n"); + } + } +#endif switch (dev.type) { case 'b': case 'c': @@ -474,6 +600,16 @@ break; } +#ifdef WITH_SELINUX + if (is_selinux_enabled() > 0) + { + /* reset the file create context to its former glory */ + if (seretval == 0) + seretval=setfscreatecon(prev_scontext); + freecon(prev_scontext); + } +#endif + exit: sysfs_close_class_device(class_dev); --- Makefile.orig 2004-08-02 22:23:58.000000000 +0100 +++ Makefile 2004-08-02 22:24:01.000000000 +0100 @@ -25,6 +25,8 @@ # Leave this set to `false' for production use. DEBUG = true +# Set this to compile with Security-Enhanced Linux support. +WITH_SELINUX = true ROOT = udev DAEMON = udevd @@ -39,6 +41,7 @@ LOCAL_CFG_DIR = etc/udev HOTPLUG_EXEC = $(ROOT) + DESTDIR = KERNEL_DIR = /lib/modules/${shell uname -r}/build @@ -172,6 +175,13 @@ CFLAGS += -I$(PWD)/libsysfs +ifeq ($(strip $(WITH_SELINUX)),true) + LIB_OBJS += \ + -lselinux + CFLAGS += \ + -DWITH_SELINUX +endif + all: $(ROOT) $(SENDER) $(DAEMON) $(INFO) $(TESTER) $(STARTER) @extras="$(EXTRAS)" ; for target in $$extras ; do \ echo $$target ; \ ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2004-08-04 11:09 UTC | newest] Thread overview: 5+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2004-08-03 15:26 [patch] udev-selinux: restores file security context and sets mode in matchpathcon Luke Kenneth Casson Leighton 2004-08-03 15:26 ` Luke Kenneth Casson Leighton 2004-08-04 9:33 ` [patch] udev-selinux: restores file security context and sets Hannes Reinecke 2004-08-04 11:09 ` [patch] udev-selinux: restores file security context and sets mode in matchpathcon Luke Kenneth Casson Leighton 2004-08-04 11:09 ` Luke Kenneth Casson Leighton
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.