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("can't get current context");
if (compute_trans) {
security_context_t file_context, new_context;
if (getfilecon(command, &file_context) < 0)
bb_error_msg_and_die("can't 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("can't set new user '%s'", user);
if (type && context_type_set(con, type))
bb_error_msg_and_die("can't set new type '%s'", type);
if (range && context_range_set(con, range))
bb_error_msg_and_die("can't set new range '%s'", range);
if (role && context_role_set(con, role))
bb_error_msg_and_die("can't set new role '%s'", role);
return con;
}
static int check_dominance(const char *pattern, const char *raw) {
security_context_t ctx;
context_t con;
struct av_decision avd;
int rc = -1;
context_t my_tmp;
const char *raw_range;
security_class_t context_class = string_to_security_class("context");
access_vector_t context_contains_perm = string_to_av_perm(context_class, "contains");
con = context_new(raw);
if (!con)
return -1;
raw_range = context_range_get(con);
my_tmp = context_new(my_context);
if (!my_tmp) {
context_free(con);
return -1;
}
ctx = NULL;
if (context_range_set(my_tmp, pattern))
goto out;
ctx = strdup(context_str(my_tmp));
if (!ctx)
goto out;
if (context_range_set(my_tmp, raw_range))
goto out;
raw = context_str(my_tmp);
if (!raw)
goto out;
rc = security_compute_av_raw(ctx, (security_context_t)raw, context_class, context_contains_perm, &avd);
if (rc)
goto out;
rc = (context_contains_perm & avd.allowed) != context_contains_perm;
out:
free(ctx);
context_free(my_tmp);
context_free(con);
return rc;
}
static int set_context_from_socket( const struct service_config *scp, int fd )
{
security_context_t curr_context = NULL;
security_context_t peer_context = NULL;
security_context_t exec_context = NULL;
context_t bcon = NULL;
context_t pcon = NULL;
security_context_t new_context = NULL;
security_context_t new_exec_context = NULL;
int retval = -1;
const char *exepath = NULL;
if (getcon(&curr_context) < 0)
goto fail;
if (getpeercon(fd, &peer_context) < 0)
goto fail;
exepath = SC_SERVER_ARGV( scp )[0];
if (getfilecon(exepath, &exec_context) < 0)
goto fail;
if (!(bcon = context_new(curr_context)))
goto fail;
if (!(pcon = context_new(peer_context)))
goto fail;
if (!context_range_get(pcon))
goto fail;
if (context_range_set(bcon, context_range_get(pcon)))
goto fail;
if (!(new_context = context_str(bcon)))
goto fail;
if (security_compute_create(new_context, exec_context, SECCLASS_PROCESS,
&new_exec_context) < 0)
goto fail;
retval = set_context(new_exec_context);
freecon(new_exec_context);
fail:
context_free(pcon);
context_free(bcon);
freecon(exec_context);
freecon(peer_context);
freecon(curr_context);
return retval;
}
/* Set the context of all files associated with this VM to the new context
* complete with the unique generated category.
*/
static int
file_con_fixup (data_t *data)
{
security_context_t sec_con = { 0, };
context_t con = { 0, };
char mcs_str[9] = { 0, };
int ret = 0, p_ret = 0, i = 0;;
p_ret = snprintf (mcs_str, sizeof (mcs_str), "s0:c%d", data->category);
if (p_ret < 0 || p_ret > 9) {
syslog (LOG_CRIT, "insufficient buffer size");
return -1;
}
for (i = 0; data->files [i] != NULL; ++i) {
if (getfilecon (data->files [i], &sec_con) == -1) {
syslog (LOG_CRIT,
"error getting context from file: %s, error %s",
data->files [i], strerror (errno));
continue;
}
con = context_new (sec_con);
if (con == NULL) {
syslog (LOG_CRIT,
"Error creating new context from string: %s",
sec_con);
ret = -1;
goto err_freecon;
}
if (context_range_set (con, mcs_str) == -1) {
syslog (LOG_CRIT,
"Error setting context range to %s, "
"error: %s", mcs_str, strerror (errno));
ret = -1;
goto err_confree;
}
syslog (LOG_INFO, "Setting context for file %s to %s",
data->files [i], context_str (con));
ret = setfilecon (data->files [i], context_str (con));
if (ret != 0)
syslog (LOG_CRIT, "setfilecon error:%s",
strerror (errno));
context_free (con);
freecon (sec_con);
}
return ret;
err_confree:
context_free (con);
err_freecon:
freecon (sec_con);
return ret;
}
static char *
SELinuxGenNewContext(const char *oldcontext, const char *mcs)
{
char *newcontext = NULL;
char *scontext = strdup(oldcontext);
context_t con;
if (!scontext) goto err;
con = context_new(scontext);
if (!con) goto err;
context_range_set(con, mcs);
newcontext = strdup(context_str(con));
context_free(con);
err:
freecon(scontext);
return newcontext;
}
int get_default_context_with_rolelevel(const char *user,
const char *role,
const char *level,
security_context_t fromcon,
security_context_t * newcon)
{
int rc = 0;
int freefrom = 0;
context_t con;
char *newfromcon;
if (!level)
return get_default_context_with_role(user, role, fromcon,
newcon);
if (!fromcon) {
rc = getcon(&fromcon);
if (rc < 0)
return rc;
freefrom = 1;
}
rc = -1;
con = context_new(fromcon);
if (!con)
goto out;
if (context_range_set(con, level))
goto out;
newfromcon = context_str(con);
if (!newfromcon)
goto out;
rc = get_default_context_with_role(user, role, newfromcon, newcon);
out:
context_free(con);
if (freefrom)
freecon(fromcon);
return rc;
}
static int mls_range_allowed(pam_handle_t *pamh, security_context_t src, security_context_t dst, int debug)
{
struct av_decision avd;
int retval;
unsigned int bit = CONTEXT__CONTAINS;
context_t src_context = context_new (src);
context_t dst_context = context_new (dst);
context_range_set(dst_context, context_range_get(src_context));
if (debug)
pam_syslog(pamh, LOG_NOTICE, "Checking if %s mls range valid for %s", dst, context_str(dst_context));
retval = security_compute_av(context_str(dst_context), dst, SECCLASS_CONTEXT, bit, &avd);
context_free(src_context);
context_free(dst_context);
if (retval || ((bit & avd.allowed) != bit))
return 0;
return 1;
}
/* Basic function to build string representation of context from
* user:role:type component and sensitivity:category.
* Returned string must be free'd by caller.
*/
static char*
create_context (char *oldcontext, char *mcs)
{
char *newcontext = NULL, *scontext = NULL;
context_t con = { 0, };
scontext = strdup(oldcontext);
if (!scontext)
return scontext;
con = context_new(scontext);
if (!con) {
perror ("context_new");
return NULL;
}
context_range_set(con, mcs);
newcontext = strdup(context_str(con));
context_free(con);
return (newcontext);
}
static context_t compute_context_from_mask(security_context_t context, unsigned long opts)
{
context_t new_context = context_new(context);
if (!new_context)
return NULL;
if ((opts & OPT_CHCON_USER) && context_user_set(new_context, user))
goto error;
if ((opts & OPT_CHCON_RANGE) && context_range_set(new_context, range))
goto error;
if ((opts & OPT_CHCON_ROLE) && context_role_set(new_context, role))
goto error;
if ((opts & OPT_CHCON_TYPE) && context_type_set(new_context, type))
goto error;
return new_context;
error:
context_free (new_context);
return NULL;
}
context_t FAST_FUNC 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;
}
int get_ordered_context_list_with_level(const char *user,
const char *level,
security_context_t fromcon,
security_context_t ** list)
{
int rc;
int freefrom = 0;
context_t con;
char *newfromcon;
if (!level)
return get_ordered_context_list(user, fromcon, list);
if (!fromcon) {
rc = getcon(&fromcon);
if (rc < 0)
return rc;
freefrom = 1;
}
rc = -1;
con = context_new(fromcon);
if (!con)
goto out;
if (context_range_set(con, level))
goto out;
newfromcon = context_str(con);
if (!newfromcon)
goto out;
rc = get_ordered_context_list(user, newfromcon, list);
out:
context_free(con);
if (freefrom)
freecon(fromcon);
return rc;
}
int mac_selinux_get_child_mls_label(int socket_fd, const char *exe, const char *exec_label, char **label) {
int r = -EOPNOTSUPP;
#ifdef HAVE_SELINUX
_cleanup_freecon_ char *mycon = NULL, *peercon = NULL, *fcon = NULL;
_cleanup_context_free_ context_t pcon = NULL, bcon = NULL;
security_class_t sclass;
const char *range = NULL;
assert(socket_fd >= 0);
assert(exe);
assert(label);
if (!mac_selinux_have())
return -EOPNOTSUPP;
r = getcon_raw(&mycon);
if (r < 0)
return -errno;
r = getpeercon_raw(socket_fd, &peercon);
if (r < 0)
return -errno;
if (!exec_label) {
/* If there is no context set for next exec let's use context
of target executable */
r = getfilecon_raw(exe, &fcon);
if (r < 0)
return -errno;
}
bcon = context_new(mycon);
if (!bcon)
return -ENOMEM;
pcon = context_new(peercon);
if (!pcon)
return -ENOMEM;
range = context_range_get(pcon);
if (!range)
return -errno;
r = context_range_set(bcon, range);
if (r)
return -errno;
freecon(mycon);
mycon = strdup(context_str(bcon));
if (!mycon)
return -ENOMEM;
sclass = string_to_security_class("process");
r = security_compute_create_raw(mycon, fcon, sclass, label);
if (r < 0)
return -errno;
#endif
return r;
}
/*
* do_set_domain
* It tries to replace the domain/range of the current context.
*/
static int
do_set_domain(security_context_t old_context, char *domain, server_rec *s)
{
security_context_t new_context;
security_context_t raw_context;
context_t context;
char *range;
/*
* Compute the new security context
*/
context = context_new(old_context);
if (!context) {
ap_log_error(APLOG_MARK, APLOG_ERR, errno, s,
"SELinux: context_new(\"%s\") failed",
old_context);
return -1;
}
range = strchr(domain, ':');
if (range)
*range++ = '\0';
if (domain && strcmp(domain, "*") != 0)
context_type_set(context, domain);
if (range && strcmp(range, "*") != 0)
context_range_set(context, range);
if (range)
*--range = ':'; /* fixup */
new_context = context_str(context);
if (!new_context) {
ap_log_error(APLOG_MARK, APLOG_ERR, errno, s,
"SELinux: context_str(\"%s:%s:%s:%s\") failed",
context_user_get(context),
context_role_get(context),
context_type_get(context),
context_range_get(context));
context_free(context);
return -1;
}
/*
* If old_context == new_context, we don't need to do anything
*/
if (selinux_trans_to_raw_context(new_context, &raw_context) < 0) {
ap_log_error(APLOG_MARK, APLOG_ERR, errno, s,
"SELinux: selinux_trans_to_raw_context(\"%s\") failed",
new_context);
context_free(context);
return -1;
}
context_free(context);
if (!strcmp(old_context, raw_context)) {
freecon(raw_context);
return 1;
}
if (setcon_raw(raw_context) < 0) {
ap_log_error(APLOG_MARK, APLOG_ERR, errno, s,
"SELinux: setcon_raw(\"%s\") failed",
raw_context);
freecon(raw_context);
return -1;
}
freecon(raw_context);
return 0;
}
static security_context_t
config_context (pam_handle_t *pamh, security_context_t defaultcon, int use_current_range, int debug)
{
security_context_t newcon=NULL;
context_t new_context;
int mls_enabled = is_selinux_mls_enabled();
char *response=NULL;
char *type=NULL;
char resp_val = 0;
pam_prompt (pamh, PAM_TEXT_INFO, NULL, _("Default Security Context %s\n"), defaultcon);
while (1) {
if (query_response(pamh,
_("Would you like to enter a different role or level?"), "n",
&response, debug) == PAM_SUCCESS) {
resp_val = response[0];
_pam_drop(response);
} else {
resp_val = 'N';
}
if ((resp_val == 'y') || (resp_val == 'Y'))
{
if ((new_context = context_new(defaultcon)) == NULL)
goto fail_set;
/* Allow the user to enter role and level individually */
if (query_response(pamh, _("role:"), context_role_get(new_context),
&response, debug) == PAM_SUCCESS && response[0]) {
if (get_default_type(response, &type)) {
pam_prompt (pamh, PAM_ERROR_MSG, NULL, _("No default type for role %s\n"), response);
_pam_drop(response);
continue;
} else {
if (context_role_set(new_context, response))
goto fail_set;
if (context_type_set (new_context, type))
goto fail_set;
}
}
_pam_drop(response);
if (mls_enabled)
{
if (use_current_range) {
security_context_t mycon = NULL;
context_t my_context;
if (getcon(&mycon) != 0)
goto fail_set;
my_context = context_new(mycon);
if (my_context == NULL) {
freecon(mycon);
goto fail_set;
}
freecon(mycon);
if (context_range_set(new_context, context_range_get(my_context))) {
context_free(my_context);
goto fail_set;
}
context_free(my_context);
} else if (query_response(pamh, _("level:"), context_range_get(new_context),
&response, debug) == PAM_SUCCESS && response[0]) {
if (context_range_set(new_context, response))
goto fail_set;
}
_pam_drop(response);
}
if (debug)
pam_syslog(pamh, LOG_NOTICE, "Selected Security Context %s", context_str(new_context));
/* Get the string value of the context and see if it is valid. */
if (!security_check_context(context_str(new_context))) {
newcon = strdup(context_str(new_context));
if (newcon == NULL)
goto fail_set;
context_free(new_context);
/* we have to check that this user is allowed to go into the
range they have specified ... role is tied to an seuser, so that'll
be checked at setexeccon time */
if (mls_enabled && !mls_range_allowed(pamh, defaultcon, newcon, debug)) {
pam_syslog(pamh, LOG_NOTICE, "Security context %s is not allowed for %s", defaultcon, newcon);
send_audit_message(pamh, 0, defaultcon, newcon);
free(newcon);
goto fail_range;
}
return newcon;
}
else {
send_audit_message(pamh, 0, defaultcon, context_str(new_context));
send_text(pamh,_("Not a valid security context"),debug);
}
context_free(new_context); /* next time around allocates another */
}
else
return strdup(defaultcon);
} /* end while */
return NULL;
fail_set:
free(type);
_pam_drop(response);
context_free (new_context);
send_audit_message(pamh, 0, defaultcon, NULL);
fail_range:
return NULL;
}
static security_context_t
manual_context (pam_handle_t *pamh, const char *user, int debug)
{
security_context_t newcon=NULL;
context_t new_context;
int mls_enabled = is_selinux_mls_enabled();
char *type=NULL;
char *response=NULL;
while (1) {
if (query_response(pamh,
_("Would you like to enter a security context? [N] "), NULL,
&response, debug) != PAM_SUCCESS)
return NULL;
if ((response[0] == 'y') || (response[0] == 'Y'))
{
if (mls_enabled)
new_context = context_new ("user:role:type:level");
else
new_context = context_new ("user:role:type");
if (!new_context)
goto fail_set;
if (context_user_set (new_context, user))
goto fail_set;
_pam_drop(response);
/* Allow the user to enter each field of the context individually */
if (query_response(pamh, _("role:"), NULL, &response, debug) == PAM_SUCCESS &&
response[0] != '\0') {
if (context_role_set (new_context, response))
goto fail_set;
if (get_default_type(response, &type))
goto fail_set;
if (context_type_set (new_context, type))
goto fail_set;
}
_pam_drop(response);
if (mls_enabled)
{
if (query_response(pamh, _("level:"), NULL, &response, debug) == PAM_SUCCESS &&
response[0] != '\0') {
if (context_range_set (new_context, response))
goto fail_set;
}
_pam_drop(response);
}
/* Get the string value of the context and see if it is valid. */
if (!security_check_context(context_str(new_context))) {
newcon = strdup(context_str(new_context));
context_free (new_context);
return newcon;
}
else
send_text(pamh,_("Not a valid security context"),debug);
context_free (new_context);
}
else {
_pam_drop(response);
return NULL;
}
} /* end while */
fail_set:
free(type);
_pam_drop(response);
context_free (new_context);
return NULL;
}
static int seapp_context_lookup(enum seapp_kind kind,
uid_t uid,
int isSystemServer,
const char *seinfo,
const char *pkgname,
const char *path,
context_t ctx)
{
const char *username = NULL;
struct seapp_context *cur = NULL;
int i;
size_t n;
uid_t userid;
uid_t appid;
__selinux_once(once, seapp_context_init);
userid = uid / AID_USER;
appid = uid % AID_USER;
if (appid < AID_APP) {
for (n = 0; n < android_id_count; n++) {
if (android_ids[n].aid == appid) {
username = android_ids[n].name;
break;
}
}
if (!username)
goto err;
} else if (appid < AID_ISOLATED_START) {
username = "******";
appid -= AID_APP;
} else {
username = "******";
appid -= AID_ISOLATED_START;
}
if (appid >= CAT_MAPPING_MAX_ID || userid >= CAT_MAPPING_MAX_ID)
goto err;
for (i = 0; i < nspec; i++) {
cur = seapp_contexts[i];
if (cur->isSystemServer != isSystemServer)
continue;
if (cur->user.str) {
if (cur->user.is_prefix) {
if (strncasecmp(username, cur->user.str, cur->user.len-1))
continue;
} else {
if (strcasecmp(username, cur->user.str))
continue;
}
}
if (cur->seinfo) {
if (!seinfo || strcasecmp(seinfo, cur->seinfo))
continue;
}
if (cur->name.str) {
if(!pkgname)
continue;
if (cur->name.is_prefix) {
if (strncasecmp(pkgname, cur->name.str, cur->name.len-1))
continue;
} else {
if (strcasecmp(pkgname, cur->name.str))
continue;
}
}
if (cur->path.str) {
if (!path)
continue;
if (cur->path.is_prefix) {
if (strncmp(path, cur->path.str, cur->path.len-1))
continue;
} else {
if (strcmp(path, cur->path.str))
continue;
}
}
if (kind == SEAPP_TYPE && !cur->type)
continue;
else if (kind == SEAPP_DOMAIN && !cur->domain)
continue;
if (cur->sebool) {
int value = security_get_boolean_active(cur->sebool);
if (value == 0)
continue;
else if (value == -1) {
selinux_log(SELINUX_ERROR, \
"Could not find boolean: %s ", cur->sebool);
goto err;
}
}
if (kind == SEAPP_TYPE) {
if (context_type_set(ctx, cur->type))
goto oom;
} else if (kind == SEAPP_DOMAIN) {
if (context_type_set(ctx, cur->domain))
goto oom;
}
if (cur->levelFrom != LEVELFROM_NONE) {
char level[255];
switch (cur->levelFrom) {
case LEVELFROM_APP:
snprintf(level, sizeof level, "s0:c%u,c%u",
appid & 0xff,
256 + (appid>>8 & 0xff));
break;
case LEVELFROM_USER:
snprintf(level, sizeof level, "s0:c%u,c%u",
512 + (userid & 0xff),
768 + (userid>>8 & 0xff));
break;
case LEVELFROM_ALL:
snprintf(level, sizeof level, "s0:c%u,c%u,c%u,c%u",
appid & 0xff,
256 + (appid>>8 & 0xff),
512 + (userid & 0xff),
768 + (userid>>8 & 0xff));
break;
default:
goto err;
}
if (context_range_set(ctx, level))
goto oom;
} else if (cur->level) {
static security_context_t
context_from_env (pam_handle_t *pamh, security_context_t defaultcon, int env_params, int use_current_range, int debug)
{
security_context_t newcon = NULL;
context_t new_context;
context_t my_context = NULL;
int mls_enabled = is_selinux_mls_enabled();
const char *env = NULL;
char *type = NULL;
if ((new_context = context_new(defaultcon)) == NULL)
goto fail_set;
if (env_params && (env = pam_getenv(pamh, "SELINUX_ROLE_REQUESTED")) != NULL && env[0] != '\0') {
if (debug)
pam_syslog(pamh, LOG_NOTICE, "Requested role: %s", env);
if (get_default_type(env, &type)) {
pam_syslog(pamh, LOG_NOTICE, "No default type for role %s", env);
goto fail_set;
} else {
if (context_role_set(new_context, env))
goto fail_set;
if (context_type_set(new_context, type))
goto fail_set;
}
}
if (mls_enabled) {
if ((env = pam_getenv(pamh, "SELINUX_USE_CURRENT_RANGE")) != NULL && env[0] == '1') {
if (debug)
pam_syslog(pamh, LOG_NOTICE, "SELINUX_USE_CURRENT_RANGE is set");
use_current_range = 1;
}
if (use_current_range) {
security_context_t mycon = NULL;
if (getcon(&mycon) != 0)
goto fail_set;
my_context = context_new(mycon);
if (my_context == NULL) {
freecon(mycon);
goto fail_set;
}
freecon(mycon);
env = context_range_get(my_context);
} else {
env = pam_getenv(pamh, "SELINUX_LEVEL_REQUESTED");
}
if (env != NULL && env[0] != '\0') {
if (debug)
pam_syslog(pamh, LOG_NOTICE, "Requested level: %s", env);
if (context_range_set(new_context, env))
goto fail_set;
}
}
newcon = strdup(context_str(new_context));
if (newcon == NULL)
goto fail_set;
if (debug)
pam_syslog(pamh, LOG_NOTICE, "Selected Security Context %s", newcon);
/* Get the string value of the context and see if it is valid. */
if (security_check_context(newcon)) {
pam_syslog(pamh, LOG_NOTICE, "Not a valid security context %s", newcon);
send_audit_message(pamh, 0, defaultcon, newcon);
freecon(newcon);
newcon = NULL;
goto fail_set;
}
/* we have to check that this user is allowed to go into the
range they have specified ... role is tied to an seuser, so that'll
be checked at setexeccon time */
if (mls_enabled && !mls_range_allowed(pamh, defaultcon, newcon, debug)) {
pam_syslog(pamh, LOG_NOTICE, "Security context %s is not allowed for %s", defaultcon, newcon);
send_audit_message(pamh, 0, defaultcon, newcon);
freecon(newcon);
newcon = NULL;
}
fail_set:
free(type);
context_free(my_context);
context_free(new_context);
send_audit_message(pamh, 0, defaultcon, NULL);
return newcon;
}
