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next portion of selinux updates: chcon, runcon. From

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Yuichi Nakamura <himainu-ynakam@miomio.jp>  
KaiGai Kohei <busybox@kaigai.gr.jp>
This commit is contained in:
Denis Vlasenko 2007-03-11 22:16:02 +00:00
parent baca175912
commit 1203c9bf2f
7 changed files with 349 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
coreutils/id.c
View File

@ -89,7 +89,7 @@ int id_main(int argc, char **argv)
if (flags & JUST_CONTEXT) {
selinux_or_die();
if (argc - optind == 1) {
bb_error_msg_and_die("can't print security context when user specified");
bb_error_msg_and_die("user name can't be passed with -Z");
}
if (getcon(&scontext)) {

1
coreutils/install.c
View File

@ -1,6 +1,7 @@
/* vi: set sw=4 ts=4: */
/*
* Copyright (C) 2003 by Glenn McGrath <bug1@iinet.net.au>
* SELinux support: by Yuichi Nakamura <ynakam@hitachisoft.jp>
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*

3
include/libbb.h
View File

@ -41,6 +41,7 @@
#if ENABLE_SELINUX
#include <selinux/selinux.h>
#include <selinux/context.h>
#endif
#if ENABLE_LOCALE_SUPPORT
@ -598,6 +599,8 @@ extern void run_shell(const char *shell, int loginshell, const char *command, co
#if ENABLE_SELINUX
extern void renew_current_security_context(void);
extern void set_current_security_context(security_context_t sid);
extern context_t set_security_context_component(security_context_t cur_context,
char *user, char *role, char *type, char *range);
#endif
extern void selinux_or_die(void);
extern int restricted_shell(const char *shell);

1
libbb/Kbuild
View File

@ -106,6 +106,7 @@ lib-$(CONFIG_SU) += correct_password.o
lib-$(CONFIG_LOGIN) += correct_password.o
lib-$(CONFIG_DF) += find_mount_point.o
lib-$(CONFIG_MKFS_MINIX) += find_mount_point.o
lib-$(CONFIG_SELINUX) += selinux_common.o
# We shouldn't build xregcomp.c if we don't need it - this ensures we don't
# require regex.h to be in the include dir even if we don't need it thereby

30
libbb/selinux_common.c Normal file
View File

@ -0,0 +1,30 @@
/*
* libbb/selinux_common.c
* -- common SELinux utility functions
*
* Copyright 2007 KaiGai Kohei <kaigai@kaigai.gr.jp>
*/
#include "busybox.h"
#include <selinux/context.h>
context_t set_security_context_component(security_context_t cur_context,
char *user, char *role, char *type, char *range)
{
context_t con = context_new(cur_context);
if (!con)
return NULL;
if (user && context_user_set(con, user))
goto error;
if (type && context_type_set(con, type))
goto error;
if (range && context_range_set(con, range))
goto error;
if (role && context_role_set(con, role))
goto error;
return con;
error:
context_free(con);
return NULL;
}

175
selinux/chcon.c Normal file
View File

@ -0,0 +1,175 @@
/*
* chcon -- change security context, based on coreutils-5.97-13
*
* Port to busybox: KaiGai Kohei <kaigai@kaigai.gr.jp>
*
* Copyright (C) 2006 - 2007 KaiGai Kohei <kaigai@kaigai.gr.jp>
*/
#include "busybox.h"
#include <getopt.h>
#include <selinux/context.h>
#define OPT_RECURSIVE (1<<0) /* 'R' */
#define OPT_CHANHES (1<<1) /* 'c' */
#define OPT_NODEREFERENCE (1<<2) /* 'h' */
#define OPT_QUIET (1<<3) /* 'f' */
#define OPT_USER (1<<4) /* 'u' */
#define OPT_ROLE (1<<5) /* 'r' */
#define OPT_TYPE (1<<6) /* 't' */
#define OPT_RANGE (1<<7) /* 'l' */
#define OPT_VERBOSE (1<<8) /* 'v' */
#define OPT_REFERENCE ((1<<9) * ENABLE_FEATURE_CHCON_LONG_OPTIONS)
#define OPT_COMPONENT_SPECIFIED (OPT_USER | OPT_ROLE | OPT_TYPE | OPT_RANGE)
static char *user = NULL;
static char *role = NULL;
static char *type = NULL;
static char *range = NULL;
static char *specified_context = NULL;
static int change_filedir_context(const char *fname, struct stat *stbuf, void *userData, int depth)
{
context_t context = NULL;
security_context_t file_context = NULL;
security_context_t context_string;
int rc = FALSE;
int status = 0;
if (option_mask32 & OPT_NODEREFERENCE) {
status = lgetfilecon(fname, &file_context);
} else {
status = getfilecon(fname, &file_context);
}
if (status < 0 && errno != ENODATA) {
if ((option_mask32 & OPT_QUIET) == 0)
bb_error_msg("cannot obtain security context: %s", fname);
goto skip;
}
if (file_context == NULL && specified_context == NULL) {
bb_error_msg("cannot apply partial context to unlabeled file %s", fname);
goto skip;
}
if (specified_context == NULL) {
context = set_security_context_component(file_context,
user, role, type, range);
if (!context) {
bb_error_msg("cannot compute security context from %s", file_context);
goto skip;
}
} else {
context = context_new(specified_context);
if (!context) {
bb_error_msg("invalid context: %s", specified_context);
goto skip;
}
}
context_string = context_str(context);
if (!context_string) {
bb_error_msg("cannot obtain security context in text expression");
goto skip;
}
if (file_context == NULL || strcmp(context_string, file_context) != 0) {
int fail;
if (option_mask32 & OPT_NODEREFERENCE) {
fail = lsetfilecon(fname, context_string);
} else {
fail = setfilecon(fname, context_string);
}
if ((option_mask32 & OPT_VERBOSE) || ((option_mask32 & OPT_CHANHES) && !fail)) {
printf(!fail
? "context of %s changed to %s\n"
: "failed to change context of %s to %s\n",
fname, context_string);
}
if (!fail) {
rc = TRUE;
} else if ((option_mask32 & OPT_QUIET) == 0) {
bb_error_msg("failed to change context of %s to %s",
fname, context_string);
}
} else if (option_mask32 & OPT_VERBOSE) {
printf("context of %s retained as %s\n", fname, context_string);
rc = TRUE;
}
skip:
/* FIXME: aren't these work ok on NULL ptr? Remove if() then */
if (context)
context_free(context);
if (file_context)
freecon(file_context);
return rc;
}
#if ENABLE_FEATURE_CHCON_LONG_OPTIONS
static struct option chcon_options[] = {
{ "recursive", 0, NULL, 'R' },
{ "changes", 0, NULL, 'c' },
{ "no-dereference", 0, NULL, 'h' },
{ "silent", 0, NULL, 'f' },
{ "quiet", 0, NULL, 'f' },
{ "user", 1, NULL, 'u' },
{ "role", 1, NULL, 'r' },
{ "type", 1, NULL, 't' },
{ "range", 1, NULL, 'l' },
{ "verbose", 0, NULL, 'v' },
{ "reference", 1, NULL, 0xff }, /* no short option */
{ NULL, 0, NULL, 0 },
};
#endif
int chcon_main(int argc, char *argv[]);
int chcon_main(int argc, char *argv[])
{
char *reference_file;
char *fname;
int i, errors = 0;
#if ENABLE_FEATURE_CHCON_LONG_OPTIONS
applet_long_options = chcon_options;
#endif
opt_complementary = "-1" /* at least 1 param */
":?:f--v:v--f" /* 'verbose' and 'quiet' are exclusive */
":\xff--urtl:u--\xff:r--\xff:t--\xff:l--\xff";
getopt32(argc, argv, "Rchf:u:r:t:l:v",
&user, &role, &type, &range, &reference_file);
argv += optind;
#if ENABLE_FEATURE_CHCON_LONG_OPTIONS
if (option_mask32 & OPT_REFERENCE) {
/* FIXME: lgetfilecon() should be used when '-h' is specified.
But current implementation follows the original one. */
if (getfilecon(reference_file, &specified_context) < 0)
bb_perror_msg_and_die("getfilecon('%s') failed", reference_file);
} else
#endif
if ((option_mask32 & OPT_COMPONENT_SPECIFIED) == 0) {
specified_context = *argv++;
/* specified_context is never NULL -
* "-1" in opt_complementary prevents this. */
if (!argv[0])
bb_error_msg_and_die("too few arguments");
}
for (i = 0; (fname = argv[i]) != NULL; i++) {
int fname_len = strlen(fname);
while (fname_len > 1 && fname[fname_len - 1] == '/')
fname_len--;
fname[fname_len] = '\0';
if (recursive_action(fname,
option_mask32 & OPT_RECURSIVE,
FALSE, /* followLinks */
FALSE, /* depthFirst */
change_filedir_context,
change_filedir_context,
NULL, 0) != TRUE)
errors = 1;
}
return errors;
}

137
selinux/runcon.c Normal file
View File

@ -0,0 +1,137 @@
/*
* runcon [ context |
* ( [ -c ] [ -r role ] [-t type] [ -u user ] [ -l levelrange ] )
* command [arg1 [arg2 ...] ]
*
* attempt to run the specified command with the specified context.
*
* -r role : use the current context with the specified role
* -t type : use the current context with the specified type
* -u user : use the current context with the specified user
* -l level : use the current context with the specified level range
* -c : compute process transition context before modifying
*
* Contexts are interpreted as follows:
*
* Number of MLS
* components system?
*
* 1 - type
* 2 - role:type
* 3 Y role:type:range
* 3 N user:role:type
* 4 Y user:role:type:range
* 4 N error
*
* Port to busybox: KaiGai Kohei <kaigai@kaigai.gr.jp>
* - based on coreutils-5.97 (in Fedora Core 6)
*/
#include "busybox.h"
#include <getopt.h>
#include <selinux/context.h>
#include <selinux/flask.h>
static context_t runcon_compute_new_context(char *user, char *role, char *type, char *range,
char *command, int compute_trans)
{
context_t con;
security_context_t cur_context;
if (getcon(&cur_context))
bb_error_msg_and_die("cannot get current context");
if (compute_trans) {
security_context_t file_context, new_context;
if (getfilecon(command, &file_context) < 0)
bb_error_msg_and_die("cannot retrieve attributes of '%s'",
command);
if (security_compute_create(cur_context, file_context,
SECCLASS_PROCESS, &new_context))
bb_error_msg_and_die("unable to compute a new context");
cur_context = new_context;
}
con = context_new(cur_context);
if (!con)
bb_error_msg_and_die("'%s' is not a valid context", cur_context);
if (user && context_user_set(con, user))
bb_error_msg_and_die("failed to set new user '%s'", user);
if (type && context_type_set(con, type))
bb_error_msg_and_die("failed to set new type '%s'", type);
if (range && context_range_set(con, range))
bb_error_msg_and_die("failed to set new range '%s'", range);
if (role && context_role_set(con, role))
bb_error_msg_and_die("failed to set new role '%s'", role);
return con;
}
#if ENABLE_FEATURE_RUNCON_LONG_OPTIONS
static const struct option runcon_options[] = {
{ "user", 1, NULL, 'u' },
{ "role", 1, NULL, 'r' },
{ "type", 1, NULL, 't' },
{ "range", 1, NULL, 'l' },
{ "compute", 0, NULL, 'c' },
{ "help", 0, NULL, 'h' },
{ NULL, 0, NULL, 0 },
};
#endif
#define OPTS_ROLE (1<<0) /* r */
#define OPTS_TYPE (1<<1) /* t */
#define OPTS_USER (1<<2) /* u */
#define OPTS_RANGE (1<<3) /* l */
#define OPTS_COMPUTE (1<<4) /* c */
#define OPTS_HELP (1<<5) /* h */
#define OPTS_CONTEXT_COMPONENT (OPTS_ROLE | OPTS_TYPE | OPTS_USER | OPTS_RANGE)
int runcon_main(int argc, char *argv[]);
int runcon_main(int argc, char *argv[])
{
char *role = NULL;
char *range = NULL;
char *user = NULL;
char *type = NULL;
char *context = NULL;
unsigned opts;
context_t con;
selinux_or_die();
#if ENABLE_FEATURE_RUNCON_LONG_OPTIONS
applet_long_options = runcon_options;
#endif
opt_complementary = "-1";
opts = getopt32(argc, argv, "r:t:u:l:ch", &role, &type, &user, &range);
argv += optind;
if (!(opts & OPTS_CONTEXT_COMPONENT)) {
context = *argv++;
if (!argv[0])
bb_error_msg_and_die("no command found");
}
if (context) {
con = context_new(context);
if (!con)
bb_error_msg_and_die("'%s' is not a valid context", context);
} else {
con = runcon_compute_new_context(user, role, type, range,
argv[0], opts & OPTS_COMPUTE);
}
if (security_check_context(context_str(con)))
bb_error_msg_and_die("'%s' is not a valid context",
context_str(con));
if (setexeccon(context_str(con)))
bb_error_msg_and_die("cannot set up security context '%s'",
context_str(con));
execvp(argv[0], argv);
bb_perror_msg_and_die("cannot execute '%s'", command);
return 1;
}