Revert "New protocol for property_service"
This reverts commit dee4bd236b
.
Bug: http://b/33926793
Bug: http://b/34670529
Change-Id: Ife3a5a471ee29cb12c2c41efef885ba40b8970e6
This commit is contained in:
parent
dee4bd236b
commit
70c4ecf2b5
|
@ -27,7 +27,6 @@
|
|||
#include <sys/poll.h>
|
||||
|
||||
#include <memory>
|
||||
#include <vector>
|
||||
|
||||
#include <cutils/misc.h>
|
||||
#include <cutils/sockets.h>
|
||||
|
@ -49,7 +48,6 @@
|
|||
|
||||
#include <fs_mgr.h>
|
||||
#include <android-base/file.h>
|
||||
#include <android-base/strings.h>
|
||||
#include "bootimg.h"
|
||||
|
||||
#include "property_service.h"
|
||||
|
@ -72,30 +70,30 @@ void property_init() {
|
|||
}
|
||||
}
|
||||
|
||||
static bool check_mac_perms(const std::string& name, char* sctx, struct ucred* cr) {
|
||||
|
||||
if (!sctx) {
|
||||
return false;
|
||||
}
|
||||
|
||||
if (!sehandle_prop) {
|
||||
return false;
|
||||
}
|
||||
|
||||
char* tctx = nullptr;
|
||||
if (selabel_lookup(sehandle_prop, &tctx, name.c_str(), 1) != 0) {
|
||||
return false;
|
||||
}
|
||||
|
||||
static int check_mac_perms(const char *name, char *sctx, struct ucred *cr)
|
||||
{
|
||||
char *tctx = NULL;
|
||||
int result = 0;
|
||||
property_audit_data audit_data;
|
||||
|
||||
audit_data.name = name.c_str();
|
||||
if (!sctx)
|
||||
goto err;
|
||||
|
||||
if (!sehandle_prop)
|
||||
goto err;
|
||||
|
||||
if (selabel_lookup(sehandle_prop, &tctx, name, 1) != 0)
|
||||
goto err;
|
||||
|
||||
audit_data.name = name;
|
||||
audit_data.cr = cr;
|
||||
|
||||
bool has_access = (selinux_check_access(sctx, tctx, "property_service", "set", &audit_data) == 0);
|
||||
if (selinux_check_access(sctx, tctx, "property_service", "set", reinterpret_cast<void*>(&audit_data)) == 0)
|
||||
result = 1;
|
||||
|
||||
freecon(tctx);
|
||||
return has_access;
|
||||
err:
|
||||
return result;
|
||||
}
|
||||
|
||||
static int check_control_mac_perms(const char *name, char *sctx, struct ucred *cr)
|
||||
|
@ -144,9 +142,11 @@ static void write_persistent_property(const char *name, const char *value)
|
|||
}
|
||||
}
|
||||
|
||||
bool is_legal_property_name(const std::string& name) {
|
||||
bool is_legal_property_name(const std::string &name)
|
||||
{
|
||||
size_t namelen = name.size();
|
||||
|
||||
if (namelen >= PROP_NAME_MAX) return false;
|
||||
if (namelen < 1) return false;
|
||||
if (name[0] == '.') return false;
|
||||
if (name[namelen - 1] == '.') return false;
|
||||
|
@ -169,218 +169,58 @@ bool is_legal_property_name(const std::string& name) {
|
|||
return true;
|
||||
}
|
||||
|
||||
uint32_t property_set(const std::string& name, const std::string& value) {
|
||||
size_t valuelen = value.size();
|
||||
int property_set(const char* name, const char* value) {
|
||||
size_t valuelen = strlen(value);
|
||||
|
||||
if (!is_legal_property_name(name)) {
|
||||
LOG(ERROR) << "property_set(\"" << name << "\", \"" << value << "\") failed: bad name";
|
||||
return PROP_ERROR_INVALID_NAME;
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (valuelen >= PROP_VALUE_MAX) {
|
||||
LOG(ERROR) << "property_set(\"" << name << "\", \"" << value << "\") failed: "
|
||||
<< "value too long";
|
||||
return PROP_ERROR_INVALID_VALUE;
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (name == "selinux.restorecon_recursive" && valuelen > 0) {
|
||||
if (restorecon(value.c_str(), SELINUX_ANDROID_RESTORECON_RECURSE) != 0) {
|
||||
if (strcmp("selinux.restorecon_recursive", name) == 0 && valuelen > 0) {
|
||||
if (restorecon(value, SELINUX_ANDROID_RESTORECON_RECURSE) != 0) {
|
||||
LOG(ERROR) << "Failed to restorecon_recursive " << value;
|
||||
}
|
||||
}
|
||||
|
||||
prop_info* pi = (prop_info*) __system_property_find(name.c_str());
|
||||
prop_info* pi = (prop_info*) __system_property_find(name);
|
||||
if (pi != nullptr) {
|
||||
// ro.* properties are actually "write-once".
|
||||
if (android::base::StartsWith(name, "ro.")) {
|
||||
if (!strncmp(name, "ro.", 3)) {
|
||||
LOG(ERROR) << "property_set(\"" << name << "\", \"" << value << "\") failed: "
|
||||
<< "property already set";
|
||||
return PROP_ERROR_READ_ONLY_PROPERTY;
|
||||
return -1;
|
||||
}
|
||||
|
||||
__system_property_update(pi, value.c_str(), valuelen);
|
||||
__system_property_update(pi, value, valuelen);
|
||||
} else {
|
||||
int rc = __system_property_add(name.c_str(), name.size(), value.c_str(), valuelen);
|
||||
int rc = __system_property_add(name, strlen(name), value, valuelen);
|
||||
if (rc < 0) {
|
||||
LOG(ERROR) << "property_set(\"" << name << "\", \"" << value << "\") failed: "
|
||||
<< "__system_property_add failed";
|
||||
return PROP_ERROR_SET_FAILED;
|
||||
return rc;
|
||||
}
|
||||
}
|
||||
|
||||
// Don't write properties to disk until after we have read all default
|
||||
// properties to prevent them from being overwritten by default values.
|
||||
if (persistent_properties_loaded && android::base::StartsWith(name, "persist.")) {
|
||||
write_persistent_property(name.c_str(), value.c_str());
|
||||
if (persistent_properties_loaded && strncmp("persist.", name, strlen("persist.")) == 0) {
|
||||
write_persistent_property(name, value);
|
||||
}
|
||||
property_changed(name.c_str(), value.c_str());
|
||||
return PROP_SUCCESS;
|
||||
property_changed(name, value);
|
||||
return 0;
|
||||
}
|
||||
|
||||
class SocketConnection {
|
||||
public:
|
||||
SocketConnection(int socket, const struct ucred& cred)
|
||||
: socket_(socket), cred_(cred) {}
|
||||
|
||||
~SocketConnection() {
|
||||
close(socket_);
|
||||
}
|
||||
|
||||
bool RecvUint32(uint32_t* value, uint32_t* timeout_ms) {
|
||||
return RecvFully(value, sizeof(*value), timeout_ms);
|
||||
}
|
||||
|
||||
bool RecvChars(char* chars, size_t size, uint32_t* timeout_ms) {
|
||||
return RecvFully(chars, size, timeout_ms);
|
||||
}
|
||||
|
||||
bool RecvString(std::string* value, uint32_t* timeout_ms) {
|
||||
uint32_t len = 0;
|
||||
if (!RecvUint32(&len, timeout_ms)) {
|
||||
return false;
|
||||
}
|
||||
|
||||
if (len == 0) {
|
||||
*value = "";
|
||||
return true;
|
||||
}
|
||||
|
||||
std::vector<char> chars(len);
|
||||
if (!RecvChars(&chars[0], len, timeout_ms)) {
|
||||
return false;
|
||||
}
|
||||
|
||||
*value = std::string(&chars[0], len);
|
||||
return true;
|
||||
}
|
||||
|
||||
bool SendUint32(uint32_t value) {
|
||||
int result = TEMP_FAILURE_RETRY(send(socket_, &value, sizeof(value), 0));
|
||||
return result == sizeof(value);
|
||||
}
|
||||
|
||||
int socket() {
|
||||
return socket_;
|
||||
}
|
||||
|
||||
const struct ucred& cred() {
|
||||
return cred_;
|
||||
}
|
||||
|
||||
private:
|
||||
bool PollIn(uint32_t* timeout_ms) {
|
||||
/* Default 2 sec timeout for caller to send data. */
|
||||
struct pollfd ufds[1];
|
||||
ufds[0].fd = socket_;
|
||||
ufds[0].events = POLLIN;
|
||||
ufds[0].revents = 0;
|
||||
while (timeout_ms > 0) {
|
||||
Timer timer;
|
||||
int nr = poll(ufds, 1, *timeout_ms);
|
||||
uint64_t millis = timer.duration_ns()/1000000;
|
||||
*timeout_ms = (millis > *timeout_ms) ? 0 : *timeout_ms - millis;
|
||||
|
||||
if (nr > 0) {
|
||||
return true;
|
||||
}
|
||||
|
||||
if (nr == 0) {
|
||||
// Timeout
|
||||
break;
|
||||
}
|
||||
|
||||
if (nr < 0 && errno != EINTR) {
|
||||
PLOG(ERROR) << "sys_prop: error waiting for uid " << cred_.uid << " to send property message";
|
||||
return false;
|
||||
} else { // errno == EINTR
|
||||
// Timer rounds milliseconds down in case of EINTR we want it to be rounded up
|
||||
// to avoid slowing init down by causing EINTR with under millisecond timeout.
|
||||
if (*timeout_ms > 0) {
|
||||
--(*timeout_ms);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
LOG(ERROR) << "sys_prop: timeout waiting for uid " << cred_.uid << " to send property message.";
|
||||
return false;
|
||||
}
|
||||
|
||||
bool RecvFully(void* data_ptr, size_t size, uint32_t* timeout_ms) {
|
||||
size_t bytes_left = size;
|
||||
char* data = static_cast<char*>(data_ptr);
|
||||
while (*timeout_ms > 0 && bytes_left > 0) {
|
||||
if (!PollIn(timeout_ms)) {
|
||||
return false;
|
||||
}
|
||||
|
||||
int result = TEMP_FAILURE_RETRY(recv(socket_, data, bytes_left, MSG_DONTWAIT));
|
||||
if (result <= 0) {
|
||||
return false;
|
||||
}
|
||||
|
||||
bytes_left -= result;
|
||||
data += result;
|
||||
}
|
||||
|
||||
return bytes_left == 0;
|
||||
}
|
||||
|
||||
int socket_;
|
||||
struct ucred cred_;
|
||||
|
||||
DISALLOW_IMPLICIT_CONSTRUCTORS(SocketConnection);
|
||||
};
|
||||
|
||||
static void handle_property_set(SocketConnection& socket,
|
||||
const std::string& name,
|
||||
const std::string& value,
|
||||
bool legacy_protocol) {
|
||||
const char* cmd_name = legacy_protocol ? "PROP_MSG_SETPROP" : "PROP_MSG_SETPROP2";
|
||||
if (!is_legal_property_name(name)) {
|
||||
LOG(ERROR) << "sys_prop(" << cmd_name << "): illegal property name \"" << name << "\"";
|
||||
socket.SendUint32(PROP_ERROR_INVALID_NAME);
|
||||
return;
|
||||
}
|
||||
|
||||
struct ucred cr = socket.cred();
|
||||
char* source_ctx = nullptr;
|
||||
getpeercon(socket.socket(), &source_ctx);
|
||||
|
||||
if (android::base::StartsWith(name, "ctl.")) {
|
||||
if (check_control_mac_perms(value.c_str(), source_ctx, &cr)) {
|
||||
handle_control_message(name.c_str() + 4, value.c_str());
|
||||
if (!legacy_protocol) {
|
||||
socket.SendUint32(PROP_SUCCESS);
|
||||
}
|
||||
} else {
|
||||
LOG(ERROR) << "sys_prop(" << cmd_name << "): Unable to " << (name.c_str() + 4)
|
||||
<< " service ctl [" << value << "]"
|
||||
<< " uid:" << cr.uid
|
||||
<< " gid:" << cr.gid
|
||||
<< " pid:" << cr.pid;
|
||||
if (!legacy_protocol) {
|
||||
socket.SendUint32(PROP_ERROR_HANDLE_CONTROL_MESSAGE);
|
||||
}
|
||||
}
|
||||
} else {
|
||||
if (check_mac_perms(name, source_ctx, &cr)) {
|
||||
uint32_t result = property_set(name, value);
|
||||
if (!legacy_protocol) {
|
||||
socket.SendUint32(result);
|
||||
}
|
||||
} else {
|
||||
LOG(ERROR) << "sys_prop(" << cmd_name << "): permission denied uid:" << cr.uid << " name:" << name;
|
||||
if (!legacy_protocol) {
|
||||
socket.SendUint32(PROP_ERROR_PERMISSION_DENIED);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
freecon(source_ctx);
|
||||
}
|
||||
|
||||
static void handle_property_set_fd() {
|
||||
static constexpr uint32_t kDefaultSocketTimeout = 2000; /* ms */
|
||||
static void handle_property_set_fd()
|
||||
{
|
||||
prop_msg msg;
|
||||
int r;
|
||||
char * source_ctx = NULL;
|
||||
|
||||
int s = accept(property_set_fd, nullptr, nullptr);
|
||||
if (s == -1) {
|
||||
|
@ -396,50 +236,72 @@ static void handle_property_set_fd() {
|
|||
return;
|
||||
}
|
||||
|
||||
SocketConnection socket(s, cr);
|
||||
uint32_t timeout_ms = kDefaultSocketTimeout;
|
||||
|
||||
uint32_t cmd = 0;
|
||||
|
||||
if (!socket.RecvUint32(&cmd, &timeout_ms)) {
|
||||
PLOG(ERROR) << "sys_prop: error while reading command from the socket";
|
||||
socket.SendUint32(PROP_ERROR_READ_CMD);
|
||||
static constexpr int timeout_ms = 2 * 1000; /* Default 2 sec timeout for caller to send property. */
|
||||
struct pollfd ufds[1];
|
||||
ufds[0].fd = s;
|
||||
ufds[0].events = POLLIN;
|
||||
ufds[0].revents = 0;
|
||||
int nr = TEMP_FAILURE_RETRY(poll(ufds, 1, timeout_ms));
|
||||
if (nr == 0) {
|
||||
LOG(ERROR) << "sys_prop: timeout waiting for uid " << cr.uid << " to send property message.";
|
||||
close(s);
|
||||
return;
|
||||
} else if (nr < 0) {
|
||||
PLOG(ERROR) << "sys_prop: error waiting for uid " << cr.uid << " to send property message";
|
||||
close(s);
|
||||
return;
|
||||
}
|
||||
|
||||
switch(cmd) {
|
||||
case PROP_MSG_SETPROP: {
|
||||
char prop_name[PROP_NAME_MAX];
|
||||
char prop_value[PROP_VALUE_MAX];
|
||||
r = TEMP_FAILURE_RETRY(recv(s, &msg, sizeof(msg), MSG_DONTWAIT));
|
||||
if(r != sizeof(prop_msg)) {
|
||||
PLOG(ERROR) << "sys_prop: mis-match msg size received: " << r << " expected: " << sizeof(prop_msg);
|
||||
close(s);
|
||||
return;
|
||||
}
|
||||
|
||||
if (!socket.RecvChars(prop_name, PROP_NAME_MAX, &timeout_ms) ||
|
||||
!socket.RecvChars(prop_value, PROP_VALUE_MAX, &timeout_ms)) {
|
||||
PLOG(ERROR) << "sys_prop(PROP_MSG_SETPROP): error while reading name/value from the socket";
|
||||
return;
|
||||
switch(msg.cmd) {
|
||||
case PROP_MSG_SETPROP:
|
||||
msg.name[PROP_NAME_MAX-1] = 0;
|
||||
msg.value[PROP_VALUE_MAX-1] = 0;
|
||||
|
||||
if (!is_legal_property_name(msg.name)) {
|
||||
LOG(ERROR) << "sys_prop: illegal property name \"" << msg.name << "\"";
|
||||
close(s);
|
||||
return;
|
||||
}
|
||||
|
||||
prop_name[PROP_NAME_MAX-1] = 0;
|
||||
prop_value[PROP_VALUE_MAX-1] = 0;
|
||||
getpeercon(s, &source_ctx);
|
||||
|
||||
handle_property_set(socket, prop_value, prop_value, true);
|
||||
break;
|
||||
}
|
||||
if(memcmp(msg.name,"ctl.",4) == 0) {
|
||||
// Keep the old close-socket-early behavior when handling
|
||||
// ctl.* properties.
|
||||
close(s);
|
||||
if (check_control_mac_perms(msg.value, source_ctx, &cr)) {
|
||||
handle_control_message((char*) msg.name + 4, (char*) msg.value);
|
||||
} else {
|
||||
LOG(ERROR) << "sys_prop: Unable to " << (msg.name + 4)
|
||||
<< " service ctl [" << msg.value << "]"
|
||||
<< " uid:" << cr.uid
|
||||
<< " gid:" << cr.gid
|
||||
<< " pid:" << cr.pid;
|
||||
}
|
||||
} else {
|
||||
if (check_mac_perms(msg.name, source_ctx, &cr)) {
|
||||
property_set((char*) msg.name, (char*) msg.value);
|
||||
} else {
|
||||
LOG(ERROR) << "sys_prop: permission denied uid:" << cr.uid << " name:" << msg.name;
|
||||
}
|
||||
|
||||
case PROP_MSG_SETPROP2: {
|
||||
std::string name;
|
||||
std::string value;
|
||||
if (!socket.RecvString(&name, &timeout_ms) ||
|
||||
!socket.RecvString(&value, &timeout_ms)) {
|
||||
PLOG(ERROR) << "sys_prop(PROP_MSG_SETPROP2): error while reading name/value from the socket";
|
||||
socket.SendUint32(PROP_ERROR_READ_DATA);
|
||||
return;
|
||||
// Note: bionic's property client code assumes that the
|
||||
// property server will not close the socket until *AFTER*
|
||||
// the property is written to memory.
|
||||
close(s);
|
||||
}
|
||||
|
||||
handle_property_set(socket, name, value, false);
|
||||
freecon(source_ctx);
|
||||
break;
|
||||
}
|
||||
|
||||
default:
|
||||
socket.SendUint32(PROP_ERROR_INVALID_CMD);
|
||||
close(s);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
@ -648,8 +510,6 @@ void load_system_props() {
|
|||
}
|
||||
|
||||
void start_property_service() {
|
||||
property_set("ro.property_service.version", "2");
|
||||
|
||||
property_set_fd = create_socket(PROP_SERVICE_NAME, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
|
||||
0666, 0, 0, NULL);
|
||||
if (property_set_fd == -1) {
|
||||
|
|
|
@ -27,14 +27,14 @@ struct property_audit_data {
|
|||
const char* name;
|
||||
};
|
||||
|
||||
void property_init(void);
|
||||
void property_load_boot_defaults(void);
|
||||
void load_persist_props(void);
|
||||
void load_system_props(void);
|
||||
void start_property_service(void);
|
||||
extern void property_init(void);
|
||||
extern void property_load_boot_defaults(void);
|
||||
extern void load_persist_props(void);
|
||||
extern void load_system_props(void);
|
||||
extern void start_property_service(void);
|
||||
std::string property_get(const char* name);
|
||||
uint32_t property_set(const std::string& name, const std::string& value);
|
||||
bool is_legal_property_name(const std::string& name);
|
||||
extern int property_set(const char *name, const char *value);
|
||||
extern bool is_legal_property_name(const std::string &name);
|
||||
|
||||
|
||||
#endif /* _INIT_PROPERTY_H */
|
||||
|
|
Loading…
Reference in New Issue