1 /*
2 *
3 * Copyright (C) 2017 The Android Open Source Project
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 #include <random>
19 #include <string>
20 #include <vector>
21
22 #include <ctype.h>
23 #include <errno.h>
24 #include <fcntl.h>
25 #include <getopt.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29
30 #define __STDC_FORMAT_MACROS
31 #include <inttypes.h>
32
33 #include <arpa/inet.h>
34 #include <net/if.h>
35 #include <netinet/in.h>
36
37 #include <sys/socket.h>
38 #include <sys/stat.h>
39 #include <sys/types.h>
40 #include <sys/wait.h>
41
42 #include <linux/in.h>
43 #include <linux/ipsec.h>
44 #include <linux/netlink.h>
45 #include <linux/xfrm.h>
46
47 #define LOG_TAG "XfrmController"
48 #include <android-base/properties.h>
49 #include <android-base/stringprintf.h>
50 #include <android-base/strings.h>
51 #include <android-base/unique_fd.h>
52 #include <android/net/INetd.h>
53 #include <cutils/properties.h>
54 #include <log/log.h>
55 #include <log/log_properties.h>
56 #include "Fwmark.h"
57 #include "InterfaceController.h"
58 #include "NetdConstants.h"
59 #include "NetlinkCommands.h"
60 #include "Permission.h"
61 #include "XfrmController.h"
62 #include "android-base/stringprintf.h"
63 #include "android-base/strings.h"
64 #include "android-base/unique_fd.h"
65 #include "netdutils/DumpWriter.h"
66 #include "netdutils/Fd.h"
67 #include "netdutils/Slice.h"
68 #include "netdutils/Syscalls.h"
69
70 using android::net::INetd;
71 using android::netdutils::DumpWriter;
72 using android::netdutils::Fd;
73 using android::netdutils::ScopedIndent;
74 using android::netdutils::Slice;
75 using android::netdutils::Status;
76 using android::netdutils::StatusOr;
77 using android::netdutils::Syscalls;
78
79 namespace android {
80 namespace net {
81
82 // Exposed for testing
83 constexpr uint32_t ALGO_MASK_AUTH_ALL = ~0;
84 // Exposed for testing
85 constexpr uint32_t ALGO_MASK_CRYPT_ALL = ~0;
86 // Exposed for testing
87 constexpr uint32_t ALGO_MASK_AEAD_ALL = ~0;
88 // Exposed for testing
89 constexpr uint8_t REPLAY_WINDOW_SIZE = 32;
90
91 namespace {
92
93 constexpr uint32_t RAND_SPI_MIN = 256;
94 constexpr uint32_t RAND_SPI_MAX = 0xFFFFFFFE;
95
96 constexpr uint32_t INVALID_SPI = 0;
97 constexpr const char* INFO_KIND_VTI = "vti";
98 constexpr const char* INFO_KIND_VTI6 = "vti6";
99 constexpr const char* INFO_KIND_XFRMI = "xfrm";
100 constexpr int INFO_KIND_MAX_LEN = 8;
101 constexpr int LOOPBACK_IFINDEX = 1;
102
103 bool mIsXfrmIntfSupported = false;
104
isEngBuild()105 static inline bool isEngBuild() {
106 static const std::string sBuildType = android::base::GetProperty("ro.build.type", "user");
107 return sBuildType == "eng";
108 }
109
110 #define XFRM_MSG_TRANS(x) \
111 case x: \
112 return #x;
113
xfrmMsgTypeToString(uint16_t msg)114 const char* xfrmMsgTypeToString(uint16_t msg) {
115 switch (msg) {
116 XFRM_MSG_TRANS(XFRM_MSG_NEWSA)
117 XFRM_MSG_TRANS(XFRM_MSG_DELSA)
118 XFRM_MSG_TRANS(XFRM_MSG_GETSA)
119 XFRM_MSG_TRANS(XFRM_MSG_NEWPOLICY)
120 XFRM_MSG_TRANS(XFRM_MSG_DELPOLICY)
121 XFRM_MSG_TRANS(XFRM_MSG_GETPOLICY)
122 XFRM_MSG_TRANS(XFRM_MSG_ALLOCSPI)
123 XFRM_MSG_TRANS(XFRM_MSG_ACQUIRE)
124 XFRM_MSG_TRANS(XFRM_MSG_EXPIRE)
125 XFRM_MSG_TRANS(XFRM_MSG_UPDPOLICY)
126 XFRM_MSG_TRANS(XFRM_MSG_UPDSA)
127 XFRM_MSG_TRANS(XFRM_MSG_POLEXPIRE)
128 XFRM_MSG_TRANS(XFRM_MSG_FLUSHSA)
129 XFRM_MSG_TRANS(XFRM_MSG_FLUSHPOLICY)
130 XFRM_MSG_TRANS(XFRM_MSG_NEWAE)
131 XFRM_MSG_TRANS(XFRM_MSG_GETAE)
132 XFRM_MSG_TRANS(XFRM_MSG_REPORT)
133 XFRM_MSG_TRANS(XFRM_MSG_MIGRATE)
134 XFRM_MSG_TRANS(XFRM_MSG_NEWSADINFO)
135 XFRM_MSG_TRANS(XFRM_MSG_GETSADINFO)
136 XFRM_MSG_TRANS(XFRM_MSG_GETSPDINFO)
137 XFRM_MSG_TRANS(XFRM_MSG_NEWSPDINFO)
138 XFRM_MSG_TRANS(XFRM_MSG_MAPPING)
139 default:
140 return "XFRM_MSG UNKNOWN";
141 }
142 }
143
144 // actually const but cannot be declared as such for reasons
145 uint8_t kPadBytesArray[] = {0, 0, 0};
146 void* kPadBytes = static_cast<void*>(kPadBytesArray);
147
148 #define LOG_HEX(__desc16__, __buf__, __len__) \
149 do { \
150 if (isEngBuild()) { \
151 logHex(__desc16__, __buf__, __len__); \
152 } \
153 } while (0)
154
155 #define LOG_IOV(__iov__) \
156 do { \
157 if (isEngBuild()) { \
158 logIov(__iov__); \
159 } \
160 } while (0)
161
logHex(const char * desc16,const char * buf,size_t len)162 void logHex(const char* desc16, const char* buf, size_t len) {
163 char* printBuf = new char[len * 2 + 1 + 26]; // len->ascii, +newline, +prefix strlen
164 int offset = 0;
165 if (desc16) {
166 sprintf(printBuf, "{%-16s}", desc16);
167 offset += 18; // prefix string length
168 }
169 sprintf(printBuf + offset, "[%4.4u]: ", (len > 9999) ? 9999 : (unsigned)len);
170 offset += 8;
171
172 for (uint32_t j = 0; j < (uint32_t)len; j++) {
173 sprintf(&printBuf[j * 2 + offset], "%0.2x", (unsigned char)buf[j]);
174 }
175 ALOGD("%s", printBuf);
176 delete[] printBuf;
177 }
178
logIov(const std::vector<iovec> & iov)179 void logIov(const std::vector<iovec>& iov) {
180 for (const iovec& row : iov) {
181 logHex(nullptr, reinterpret_cast<char*>(row.iov_base), row.iov_len);
182 }
183 }
184
fillNlAttr(__u16 nlaType,size_t valueSize,nlattr * nlAttr)185 size_t fillNlAttr(__u16 nlaType, size_t valueSize, nlattr* nlAttr) {
186 size_t dataLen = valueSize;
187 int padLength = NLMSG_ALIGN(dataLen) - dataLen;
188 nlAttr->nla_len = (__u16)(dataLen + sizeof(nlattr));
189 nlAttr->nla_type = nlaType;
190 return padLength;
191 }
192
fillNlAttrIpAddress(__u16 nlaType,int family,const std::string & value,nlattr * nlAttr,Slice ipAddress)193 size_t fillNlAttrIpAddress(__u16 nlaType, int family, const std::string& value, nlattr* nlAttr,
194 Slice ipAddress) {
195 inet_pton(family, value.c_str(), ipAddress.base());
196 return fillNlAttr(nlaType, (family == AF_INET) ? sizeof(in_addr) : sizeof(in6_addr), nlAttr);
197 }
198
fillNlAttrU32(__u16 nlaType,uint32_t value,XfrmController::nlattr_payload_u32 * nlAttr)199 size_t fillNlAttrU32(__u16 nlaType, uint32_t value, XfrmController::nlattr_payload_u32* nlAttr) {
200 nlAttr->value = value;
201 return fillNlAttr(nlaType, sizeof(value), &nlAttr->hdr);
202 }
203
204 // returns the address family, placing the string in the provided buffer
convertStringAddress(const std::string & addr,uint8_t * buffer)205 StatusOr<uint16_t> convertStringAddress(const std::string& addr, uint8_t* buffer) {
206 if (inet_pton(AF_INET, addr.c_str(), buffer) == 1) {
207 return AF_INET;
208 } else if (inet_pton(AF_INET6, addr.c_str(), buffer) == 1) {
209 return AF_INET6;
210 } else {
211 return Status(EAFNOSUPPORT);
212 }
213 }
214
215 // TODO: Need to consider a way to refer to the sSycalls instance
getSyscallInstance()216 inline Syscalls& getSyscallInstance() { return netdutils::sSyscalls.get(); }
217
218 class XfrmSocketImpl : public XfrmSocket {
219 private:
220 static constexpr int NLMSG_DEFAULTSIZE = 8192;
221
222 union NetlinkResponse {
223 nlmsghdr hdr;
224 struct _err_ {
225 nlmsghdr hdr;
226 nlmsgerr err;
227 } err;
228
229 struct _buf_ {
230 nlmsghdr hdr;
231 char buf[NLMSG_DEFAULTSIZE];
232 } buf;
233 };
234
235 public:
open()236 netdutils::Status open() override {
237 mSock = openNetlinkSocket(NETLINK_XFRM);
238 if (mSock < 0) {
239 ALOGW("Could not get a new socket, line=%d", __LINE__);
240 return netdutils::statusFromErrno(-mSock, "Could not open netlink socket");
241 }
242
243 return netdutils::status::ok;
244 }
245
validateResponse(NetlinkResponse response,size_t len)246 static netdutils::Status validateResponse(NetlinkResponse response, size_t len) {
247 if (len < sizeof(nlmsghdr)) {
248 ALOGW("Invalid response message received over netlink");
249 return netdutils::statusFromErrno(EBADMSG, "Invalid message");
250 }
251
252 switch (response.hdr.nlmsg_type) {
253 case NLMSG_NOOP:
254 case NLMSG_DONE:
255 return netdutils::status::ok;
256 case NLMSG_OVERRUN:
257 ALOGD("Netlink request overran kernel buffer");
258 return netdutils::statusFromErrno(EBADMSG, "Kernel buffer overrun");
259 case NLMSG_ERROR:
260 if (len < sizeof(NetlinkResponse::_err_)) {
261 ALOGD("Netlink message received malformed error response");
262 return netdutils::statusFromErrno(EBADMSG, "Malformed error response");
263 }
264 return netdutils::statusFromErrno(
265 -response.err.err.error,
266 "Error netlink message"); // Netlink errors are negative errno.
267 case XFRM_MSG_NEWSA:
268 break;
269 }
270
271 if (response.hdr.nlmsg_type < XFRM_MSG_BASE /*== NLMSG_MIN_TYPE*/ ||
272 response.hdr.nlmsg_type > XFRM_MSG_MAX) {
273 ALOGD("Netlink message responded with an out-of-range message ID");
274 return netdutils::statusFromErrno(EBADMSG, "Invalid message ID");
275 }
276
277 // TODO Add more message validation here
278 return netdutils::status::ok;
279 }
280
sendMessage(uint16_t nlMsgType,uint16_t nlMsgFlags,uint16_t nlMsgSeqNum,std::vector<iovec> * iovecs) const281 netdutils::Status sendMessage(uint16_t nlMsgType, uint16_t nlMsgFlags, uint16_t nlMsgSeqNum,
282 std::vector<iovec>* iovecs) const override {
283 nlmsghdr nlMsg = {
284 .nlmsg_type = nlMsgType,
285 .nlmsg_flags = nlMsgFlags,
286 .nlmsg_seq = nlMsgSeqNum,
287 };
288
289 (*iovecs)[0].iov_base = &nlMsg;
290 (*iovecs)[0].iov_len = NLMSG_HDRLEN;
291 for (const iovec& iov : *iovecs) {
292 nlMsg.nlmsg_len += iov.iov_len;
293 }
294
295 ALOGD("Sending Netlink XFRM Message: %s", xfrmMsgTypeToString(nlMsgType));
296 LOG_IOV(*iovecs);
297
298 StatusOr<size_t> writeResult = getSyscallInstance().writev(mSock, *iovecs);
299 if (!isOk(writeResult)) {
300 ALOGE("netlink socket writev failed (%s)", toString(writeResult).c_str());
301 return writeResult;
302 }
303
304 if (nlMsg.nlmsg_len != writeResult.value()) {
305 ALOGE("Invalid netlink message length sent %d", static_cast<int>(writeResult.value()));
306 return netdutils::statusFromErrno(EBADMSG, "Invalid message length");
307 }
308
309 NetlinkResponse response = {};
310
311 StatusOr<Slice> readResult =
312 getSyscallInstance().read(Fd(mSock), netdutils::makeSlice(response));
313 if (!isOk(readResult)) {
314 ALOGE("netlink response error (%s)", toString(readResult).c_str());
315 return readResult;
316 }
317
318 LOG_HEX("netlink msg resp", reinterpret_cast<char*>(readResult.value().base()),
319 readResult.value().size());
320
321 Status validateStatus = validateResponse(response, readResult.value().size());
322 if (!isOk(validateStatus)) {
323 ALOGE("netlink response contains error (%s)", toString(validateStatus).c_str());
324 }
325
326 return validateStatus;
327 }
328 };
329
convertToXfrmAddr(const std::string & strAddr,xfrm_address_t * xfrmAddr)330 StatusOr<int> convertToXfrmAddr(const std::string& strAddr, xfrm_address_t* xfrmAddr) {
331 if (strAddr.length() == 0) {
332 memset(xfrmAddr, 0, sizeof(*xfrmAddr));
333 return AF_UNSPEC;
334 }
335
336 if (inet_pton(AF_INET6, strAddr.c_str(), reinterpret_cast<void*>(xfrmAddr))) {
337 return AF_INET6;
338 } else if (inet_pton(AF_INET, strAddr.c_str(), reinterpret_cast<void*>(xfrmAddr))) {
339 return AF_INET;
340 } else {
341 return netdutils::statusFromErrno(EAFNOSUPPORT, "Invalid address family");
342 }
343 }
344
fillXfrmNlaHdr(nlattr * hdr,uint16_t type,uint16_t len)345 void fillXfrmNlaHdr(nlattr* hdr, uint16_t type, uint16_t len) {
346 hdr->nla_type = type;
347 hdr->nla_len = len;
348 }
349
fillXfrmCurLifetimeDefaults(xfrm_lifetime_cur * cur)350 void fillXfrmCurLifetimeDefaults(xfrm_lifetime_cur* cur) {
351 memset(reinterpret_cast<char*>(cur), 0, sizeof(*cur));
352 }
fillXfrmLifetimeDefaults(xfrm_lifetime_cfg * cfg)353 void fillXfrmLifetimeDefaults(xfrm_lifetime_cfg* cfg) {
354 cfg->soft_byte_limit = XFRM_INF;
355 cfg->hard_byte_limit = XFRM_INF;
356 cfg->soft_packet_limit = XFRM_INF;
357 cfg->hard_packet_limit = XFRM_INF;
358 }
359
360 /*
361 * Allocate SPIs within an (inclusive) range of min-max.
362 * returns 0 (INVALID_SPI) once the entire range has been parsed.
363 */
364 class RandomSpi {
365 public:
RandomSpi(int min,int max)366 RandomSpi(int min, int max) : mMin(min) {
367 // Re-seeding should be safe because the seed itself is
368 // sufficiently random and we don't need secure random
369 std::mt19937 rnd = std::mt19937(std::random_device()());
370 mNext = std::uniform_int_distribution<>(1, INT_MAX)(rnd);
371 mSize = max - min + 1;
372 mCount = mSize;
373 }
374
next()375 uint32_t next() {
376 if (!mCount)
377 return 0;
378 mCount--;
379 return (mNext++ % mSize) + mMin;
380 }
381
382 private:
383 uint32_t mNext;
384 uint32_t mSize;
385 uint32_t mMin;
386 uint32_t mCount;
387 };
388
389 } // namespace
390
391 //
392 // Begin XfrmController Impl
393 //
394 //
XfrmController(void)395 XfrmController::XfrmController(void) {}
396
397 // Test-only constructor allowing override of XFRM Interface support checks
XfrmController(bool xfrmIntfSupport)398 XfrmController::XfrmController(bool xfrmIntfSupport) {
399 mIsXfrmIntfSupported = xfrmIntfSupport;
400 }
401
Init()402 netdutils::Status XfrmController::Init() {
403 RETURN_IF_NOT_OK(flushInterfaces());
404 mIsXfrmIntfSupported = isXfrmIntfSupported();
405
406 XfrmSocketImpl sock;
407 RETURN_IF_NOT_OK(sock.open());
408 RETURN_IF_NOT_OK(flushSaDb(sock));
409 return flushPolicyDb(sock);
410 }
411
flushInterfaces()412 netdutils::Status XfrmController::flushInterfaces() {
413 const auto& ifaces = InterfaceController::getIfaceNames();
414 RETURN_IF_NOT_OK(ifaces);
415 const String8 ifPrefix8 = String8(INetd::IPSEC_INTERFACE_PREFIX().string());
416
417 for (const std::string& iface : ifaces.value()) {
418 netdutils::Status status;
419 // Look for the reserved interface prefix, which must be in the name at position 0
420 if (android::base::StartsWith(iface.c_str(), ifPrefix8.c_str())) {
421 RETURN_IF_NOT_OK(ipSecRemoveTunnelInterface(iface));
422 }
423 }
424 return netdutils::status::ok;
425 }
426
flushSaDb(const XfrmSocket & s)427 netdutils::Status XfrmController::flushSaDb(const XfrmSocket& s) {
428 struct xfrm_usersa_flush flushUserSa = {.proto = IPSEC_PROTO_ANY};
429
430 std::vector<iovec> iov = {{nullptr, 0}, // reserved for the eventual addition of a NLMSG_HDR
431 {&flushUserSa, sizeof(flushUserSa)}, // xfrm_usersa_flush structure
432 {kPadBytes, NLMSG_ALIGN(sizeof(flushUserSa)) - sizeof(flushUserSa)}};
433
434 return s.sendMessage(XFRM_MSG_FLUSHSA, NETLINK_REQUEST_FLAGS, 0, &iov);
435 }
436
flushPolicyDb(const XfrmSocket & s)437 netdutils::Status XfrmController::flushPolicyDb(const XfrmSocket& s) {
438 std::vector<iovec> iov = {{nullptr, 0}}; // reserved for the eventual addition of a NLMSG_HDR
439 return s.sendMessage(XFRM_MSG_FLUSHPOLICY, NETLINK_REQUEST_FLAGS, 0, &iov);
440 }
441
isXfrmIntfSupported()442 bool XfrmController::isXfrmIntfSupported() {
443 const char* IPSEC_TEST_INTF_NAME = "ipsec_test";
444 const int32_t XFRM_TEST_IF_ID = 0xFFFF;
445
446 bool errored = false;
447 errored |=
448 ipSecAddXfrmInterface(IPSEC_TEST_INTF_NAME, XFRM_TEST_IF_ID, NETLINK_ROUTE_CREATE_FLAGS)
449 .code();
450 errored |= ipSecRemoveTunnelInterface(IPSEC_TEST_INTF_NAME).code();
451 return !errored;
452 }
453
ipSecSetEncapSocketOwner(int socketFd,int newUid,uid_t callerUid)454 netdutils::Status XfrmController::ipSecSetEncapSocketOwner(int socketFd, int newUid,
455 uid_t callerUid) {
456 ALOGD("XfrmController:%s, line=%d", __FUNCTION__, __LINE__);
457
458 const int fd = socketFd;
459 struct stat info;
460 if (fstat(fd, &info)) {
461 return netdutils::statusFromErrno(errno, "Failed to stat socket file descriptor");
462 }
463 if (info.st_uid != callerUid) {
464 return netdutils::statusFromErrno(EPERM, "fchown disabled for non-owner calls");
465 }
466 if (S_ISSOCK(info.st_mode) == 0) {
467 return netdutils::statusFromErrno(EINVAL, "File descriptor was not a socket");
468 }
469
470 int optval;
471 socklen_t optlen = sizeof(optval);
472 netdutils::Status status =
473 getSyscallInstance().getsockopt(Fd(fd), IPPROTO_UDP, UDP_ENCAP, &optval, &optlen);
474 if (status != netdutils::status::ok) {
475 return status;
476 }
477 if (optval != UDP_ENCAP_ESPINUDP && optval != UDP_ENCAP_ESPINUDP_NON_IKE) {
478 return netdutils::statusFromErrno(EINVAL, "Socket did not have UDP-encap sockopt set");
479 }
480 if (fchown(fd, newUid, -1)) {
481 return netdutils::statusFromErrno(errno, "Failed to fchown socket file descriptor");
482 }
483
484 return netdutils::status::ok;
485 }
486
ipSecAllocateSpi(int32_t transformId,const std::string & sourceAddress,const std::string & destinationAddress,int32_t inSpi,int32_t * outSpi)487 netdutils::Status XfrmController::ipSecAllocateSpi(int32_t transformId,
488 const std::string& sourceAddress,
489 const std::string& destinationAddress,
490 int32_t inSpi, int32_t* outSpi) {
491 ALOGD("XfrmController:%s, line=%d", __FUNCTION__, __LINE__);
492 ALOGD("transformId=%d", transformId);
493 ALOGD("sourceAddress=%s", sourceAddress.c_str());
494 ALOGD("destinationAddress=%s", destinationAddress.c_str());
495 ALOGD("inSpi=%0.8x", inSpi);
496
497 XfrmSaInfo saInfo{};
498 netdutils::Status ret = fillXfrmCommonInfo(sourceAddress, destinationAddress, INVALID_SPI, 0, 0,
499 transformId, 0, &saInfo);
500 if (!isOk(ret)) {
501 return ret;
502 }
503
504 XfrmSocketImpl sock;
505 netdutils::Status socketStatus = sock.open();
506 if (!isOk(socketStatus)) {
507 ALOGD("Sock open failed for XFRM, line=%d", __LINE__);
508 return socketStatus;
509 }
510
511 int minSpi = RAND_SPI_MIN, maxSpi = RAND_SPI_MAX;
512
513 if (inSpi)
514 minSpi = maxSpi = inSpi;
515
516 ret = allocateSpi(saInfo, minSpi, maxSpi, reinterpret_cast<uint32_t*>(outSpi), sock);
517 if (!isOk(ret)) {
518 // TODO: May want to return a new Status with a modified status string
519 ALOGD("Failed to Allocate an SPI, line=%d", __LINE__);
520 *outSpi = INVALID_SPI;
521 }
522
523 return ret;
524 }
525
ipSecAddSecurityAssociation(int32_t transformId,int32_t mode,const std::string & sourceAddress,const std::string & destinationAddress,int32_t underlyingNetId,int32_t spi,int32_t markValue,int32_t markMask,const std::string & authAlgo,const std::vector<uint8_t> & authKey,int32_t authTruncBits,const std::string & cryptAlgo,const std::vector<uint8_t> & cryptKey,int32_t cryptTruncBits,const std::string & aeadAlgo,const std::vector<uint8_t> & aeadKey,int32_t aeadIcvBits,int32_t encapType,int32_t encapLocalPort,int32_t encapRemotePort,int32_t xfrmInterfaceId)526 netdutils::Status XfrmController::ipSecAddSecurityAssociation(
527 int32_t transformId, int32_t mode, const std::string& sourceAddress,
528 const std::string& destinationAddress, int32_t underlyingNetId, int32_t spi,
529 int32_t markValue, int32_t markMask, const std::string& authAlgo,
530 const std::vector<uint8_t>& authKey, int32_t authTruncBits, const std::string& cryptAlgo,
531 const std::vector<uint8_t>& cryptKey, int32_t cryptTruncBits, const std::string& aeadAlgo,
532 const std::vector<uint8_t>& aeadKey, int32_t aeadIcvBits, int32_t encapType,
533 int32_t encapLocalPort, int32_t encapRemotePort, int32_t xfrmInterfaceId) {
534 ALOGD("XfrmController::%s, line=%d", __FUNCTION__, __LINE__);
535 ALOGD("transformId=%d", transformId);
536 ALOGD("mode=%d", mode);
537 ALOGD("sourceAddress=%s", sourceAddress.c_str());
538 ALOGD("destinationAddress=%s", destinationAddress.c_str());
539 ALOGD("underlyingNetworkId=%d", underlyingNetId);
540 ALOGD("spi=%0.8x", spi);
541 ALOGD("markValue=%x", markValue);
542 ALOGD("markMask=%x", markMask);
543 ALOGD("authAlgo=%s", authAlgo.c_str());
544 ALOGD("authTruncBits=%d", authTruncBits);
545 ALOGD("cryptAlgo=%s", cryptAlgo.c_str());
546 ALOGD("cryptTruncBits=%d,", cryptTruncBits);
547 ALOGD("aeadAlgo=%s", aeadAlgo.c_str());
548 ALOGD("aeadIcvBits=%d,", aeadIcvBits);
549 ALOGD("encapType=%d", encapType);
550 ALOGD("encapLocalPort=%d", encapLocalPort);
551 ALOGD("encapRemotePort=%d", encapRemotePort);
552 ALOGD("xfrmInterfaceId=%d", xfrmInterfaceId);
553
554 XfrmSaInfo saInfo{};
555 netdutils::Status ret = fillXfrmCommonInfo(sourceAddress, destinationAddress, spi, markValue,
556 markMask, transformId, xfrmInterfaceId, &saInfo);
557 if (!isOk(ret)) {
558 return ret;
559 }
560
561 saInfo.auth = XfrmAlgo{
562 .name = authAlgo, .key = authKey, .truncLenBits = static_cast<uint16_t>(authTruncBits)};
563
564 saInfo.crypt = XfrmAlgo{
565 .name = cryptAlgo, .key = cryptKey, .truncLenBits = static_cast<uint16_t>(cryptTruncBits)};
566
567 saInfo.aead = XfrmAlgo{
568 .name = aeadAlgo, .key = aeadKey, .truncLenBits = static_cast<uint16_t>(aeadIcvBits)};
569
570 switch (static_cast<XfrmMode>(mode)) {
571 case XfrmMode::TRANSPORT:
572 case XfrmMode::TUNNEL:
573 saInfo.mode = static_cast<XfrmMode>(mode);
574 break;
575 default:
576 return netdutils::statusFromErrno(EINVAL, "Invalid xfrm mode");
577 }
578
579 XfrmSocketImpl sock;
580 netdutils::Status socketStatus = sock.open();
581 if (!isOk(socketStatus)) {
582 ALOGD("Sock open failed for XFRM, line=%d", __LINE__);
583 return socketStatus;
584 }
585
586 switch (static_cast<XfrmEncapType>(encapType)) {
587 case XfrmEncapType::ESPINUDP:
588 case XfrmEncapType::ESPINUDP_NON_IKE:
589 if (saInfo.addrFamily != AF_INET) {
590 return netdutils::statusFromErrno(EAFNOSUPPORT, "IPv6 encap not supported");
591 }
592 // The ports are not used on input SAs, so this is OK to be wrong when
593 // direction is ultimately input.
594 saInfo.encap.srcPort = encapLocalPort;
595 saInfo.encap.dstPort = encapRemotePort;
596 [[fallthrough]];
597 case XfrmEncapType::NONE:
598 saInfo.encap.type = static_cast<XfrmEncapType>(encapType);
599 break;
600 default:
601 return netdutils::statusFromErrno(EINVAL, "Invalid encap type");
602 }
603
604 saInfo.netId = underlyingNetId;
605
606 ret = updateSecurityAssociation(saInfo, sock);
607 if (!isOk(ret)) {
608 ALOGD("Failed updating a Security Association, line=%d", __LINE__);
609 }
610
611 return ret;
612 }
613
ipSecDeleteSecurityAssociation(int32_t transformId,const std::string & sourceAddress,const std::string & destinationAddress,int32_t spi,int32_t markValue,int32_t markMask,int32_t xfrmInterfaceId)614 netdutils::Status XfrmController::ipSecDeleteSecurityAssociation(
615 int32_t transformId, const std::string& sourceAddress,
616 const std::string& destinationAddress, int32_t spi, int32_t markValue, int32_t markMask,
617 int32_t xfrmInterfaceId) {
618 ALOGD("XfrmController:%s, line=%d", __FUNCTION__, __LINE__);
619 ALOGD("transformId=%d", transformId);
620 ALOGD("sourceAddress=%s", sourceAddress.c_str());
621 ALOGD("destinationAddress=%s", destinationAddress.c_str());
622 ALOGD("spi=%0.8x", spi);
623 ALOGD("markValue=%x", markValue);
624 ALOGD("markMask=%x", markMask);
625 ALOGD("xfrmInterfaceId=%d", xfrmInterfaceId);
626
627 XfrmSaInfo saInfo{};
628 netdutils::Status ret = fillXfrmCommonInfo(sourceAddress, destinationAddress, spi, markValue,
629 markMask, transformId, xfrmInterfaceId, &saInfo);
630 if (!isOk(ret)) {
631 return ret;
632 }
633
634 XfrmSocketImpl sock;
635 netdutils::Status socketStatus = sock.open();
636 if (!isOk(socketStatus)) {
637 ALOGD("Sock open failed for XFRM, line=%d", __LINE__);
638 return socketStatus;
639 }
640
641 ret = deleteSecurityAssociation(saInfo, sock);
642 if (!isOk(ret)) {
643 ALOGD("Failed to delete Security Association, line=%d", __LINE__);
644 }
645
646 return ret;
647 }
648
ipSecMigrate(int32_t transformId,int32_t selAddrFamily,int32_t direction,const std::string & oldSourceAddress,const std::string & oldDestinationAddress,const std::string & newSourceAddress,const std::string & newDestinationAddress,int32_t xfrmInterfaceId)649 netdutils::Status XfrmController::ipSecMigrate(int32_t transformId, int32_t selAddrFamily,
650 int32_t direction,
651 const std::string& oldSourceAddress,
652 const std::string& oldDestinationAddress,
653 const std::string& newSourceAddress,
654 const std::string& newDestinationAddress,
655 int32_t xfrmInterfaceId) {
656 ALOGD("XfrmController:%s, line=%d", __FUNCTION__, __LINE__);
657 ALOGD("transformId=%d", transformId);
658 ALOGD("selAddrFamily=%d", selAddrFamily);
659 ALOGD("direction=%d", direction);
660 ALOGD("oldSourceAddress=%s", oldSourceAddress.c_str());
661 ALOGD("oldDestinationAddress=%s", oldDestinationAddress.c_str());
662 ALOGD("newSourceAddress=%s", newSourceAddress.c_str());
663 ALOGD("newDestinationAddress=%s", newDestinationAddress.c_str());
664 ALOGD("xfrmInterfaceId=%d", xfrmInterfaceId);
665
666 XfrmSocketImpl sock;
667 Status socketStatus = sock.open();
668 if (!socketStatus.ok()) {
669 ALOGD("Sock open failed for XFRM, line=%d", __LINE__);
670 return socketStatus;
671 }
672
673 XfrmMigrateInfo migrateInfo{};
674 Status ret =
675 fillXfrmCommonInfo(oldSourceAddress, oldDestinationAddress, 0 /* spi */, 0 /* mark */,
676 0 /* markMask */, transformId, xfrmInterfaceId, &migrateInfo);
677
678 if (!ret.ok()) {
679 ALOGD("Failed to fill in XfrmCommonInfo, line=%d", __LINE__);
680 return ret;
681 }
682
683 migrateInfo.selAddrFamily = selAddrFamily;
684 migrateInfo.direction = static_cast<XfrmDirection>(direction);
685
686 ret = fillXfrmEndpointPair(newSourceAddress, newDestinationAddress,
687 &migrateInfo.newEndpointInfo);
688 if (!ret.ok()) {
689 ALOGD("Failed to fill in XfrmEndpointPair, line=%d", __LINE__);
690 return ret;
691 }
692
693 ret = migrate(migrateInfo, sock);
694
695 if (!ret.ok()) {
696 ALOGD("Failed to migrate Security Association, line=%d", __LINE__);
697 }
698 return ret;
699 }
700
fillXfrmEndpointPair(const std::string & sourceAddress,const std::string & destinationAddress,XfrmEndpointPair * endpointPair)701 netdutils::Status XfrmController::fillXfrmEndpointPair(const std::string& sourceAddress,
702 const std::string& destinationAddress,
703 XfrmEndpointPair* endpointPair) {
704 // Use the addresses to determine the address family and do validation
705 xfrm_address_t sourceXfrmAddr{}, destXfrmAddr{};
706 StatusOr<int> sourceFamily, destFamily;
707 sourceFamily = convertToXfrmAddr(sourceAddress, &sourceXfrmAddr);
708 destFamily = convertToXfrmAddr(destinationAddress, &destXfrmAddr);
709 if (!isOk(sourceFamily) || !isOk(destFamily)) {
710 return netdutils::statusFromErrno(
711 EINVAL, "Invalid address " + sourceAddress + "/" + destinationAddress);
712 }
713
714 if (destFamily.value() == AF_UNSPEC ||
715 (sourceFamily.value() != AF_UNSPEC && sourceFamily.value() != destFamily.value())) {
716 ALOGD("Invalid or Mismatched Address Families, %d != %d, line=%d", sourceFamily.value(),
717 destFamily.value(), __LINE__);
718 return netdutils::statusFromErrno(EINVAL, "Invalid or mismatched address families");
719 }
720
721 endpointPair->addrFamily = destFamily.value();
722
723 endpointPair->dstAddr = destXfrmAddr;
724 endpointPair->srcAddr = sourceXfrmAddr;
725
726 return netdutils::status::ok;
727 }
728
fillXfrmCommonInfo(const std::string & sourceAddress,const std::string & destinationAddress,int32_t spi,int32_t markValue,int32_t markMask,int32_t transformId,int32_t xfrmInterfaceId,XfrmCommonInfo * info)729 netdutils::Status XfrmController::fillXfrmCommonInfo(const std::string& sourceAddress,
730 const std::string& destinationAddress,
731 int32_t spi, int32_t markValue,
732 int32_t markMask, int32_t transformId,
733 int32_t xfrmInterfaceId,
734 XfrmCommonInfo* info) {
735 Status ret = fillXfrmEndpointPair(sourceAddress, destinationAddress, info);
736 if (!isOk(ret)) {
737 return ret;
738 }
739
740 return fillXfrmCommonInfo(spi, markValue, markMask, transformId, xfrmInterfaceId, info);
741 }
742
fillXfrmCommonInfo(int32_t spi,int32_t markValue,int32_t markMask,int32_t transformId,int32_t xfrmInterfaceId,XfrmCommonInfo * info)743 netdutils::Status XfrmController::fillXfrmCommonInfo(int32_t spi, int32_t markValue,
744 int32_t markMask, int32_t transformId,
745 int32_t xfrmInterfaceId,
746 XfrmCommonInfo* info) {
747 info->transformId = transformId;
748 info->spi = htonl(spi);
749
750 if (mIsXfrmIntfSupported) {
751 info->xfrm_if_id = xfrmInterfaceId;
752 } else {
753 info->mark.v = markValue;
754 info->mark.m = markMask;
755 }
756
757 return netdutils::status::ok;
758 }
759
ipSecApplyTransportModeTransform(int socketFd,int32_t transformId,int32_t direction,const std::string & sourceAddress,const std::string & destinationAddress,int32_t spi)760 netdutils::Status XfrmController::ipSecApplyTransportModeTransform(
761 int socketFd, int32_t transformId, int32_t direction, const std::string& sourceAddress,
762 const std::string& destinationAddress, int32_t spi) {
763 ALOGD("XfrmController::%s, line=%d", __FUNCTION__, __LINE__);
764 ALOGD("transformId=%d", transformId);
765 ALOGD("direction=%d", direction);
766 ALOGD("sourceAddress=%s", sourceAddress.c_str());
767 ALOGD("destinationAddress=%s", destinationAddress.c_str());
768 ALOGD("spi=%0.8x", spi);
769
770 StatusOr<sockaddr_storage> ret =
771 getSyscallInstance().getsockname<sockaddr_storage>(Fd(socketFd));
772 if (!isOk(ret)) {
773 ALOGE("Failed to get socket info in %s", __FUNCTION__);
774 return ret;
775 }
776 struct sockaddr_storage saddr = ret.value();
777
778 XfrmSpInfo spInfo{};
779 netdutils::Status status = fillXfrmCommonInfo(sourceAddress, destinationAddress, spi, 0, 0,
780 transformId, 0, &spInfo);
781 if (!isOk(status)) {
782 ALOGE("Couldn't build SA ID %s", __FUNCTION__);
783 return status;
784 }
785
786 spInfo.selAddrFamily = spInfo.addrFamily;
787 spInfo.direction = static_cast<XfrmDirection>(direction);
788
789 // Allow dual stack sockets. Dual stack sockets are guaranteed to never have an AF_INET source
790 // address; the source address would instead be an IPv4-mapped address. Thus, disallow AF_INET
791 // sockets with mismatched address families (All other cases are acceptable).
792 if (saddr.ss_family == AF_INET && spInfo.addrFamily != AF_INET) {
793 ALOGE("IPV4 socket address family(%d) should match IPV4 Transform "
794 "address family(%d)!",
795 saddr.ss_family, spInfo.addrFamily);
796 return netdutils::statusFromErrno(EINVAL, "Mismatched address family");
797 }
798
799 struct {
800 xfrm_userpolicy_info info;
801 xfrm_user_tmpl tmpl;
802 } policy{};
803
804 fillUserSpInfo(spInfo, &policy.info);
805 fillUserTemplate(spInfo, &policy.tmpl);
806
807 LOG_HEX("XfrmUserPolicy", reinterpret_cast<char*>(&policy), sizeof(policy));
808
809 int sockOpt, sockLayer;
810 switch (saddr.ss_family) {
811 case AF_INET:
812 sockOpt = IP_XFRM_POLICY;
813 sockLayer = SOL_IP;
814 break;
815 case AF_INET6:
816 sockOpt = IPV6_XFRM_POLICY;
817 sockLayer = SOL_IPV6;
818 break;
819 default:
820 return netdutils::statusFromErrno(EAFNOSUPPORT, "Invalid address family");
821 }
822
823 status = getSyscallInstance().setsockopt(Fd(socketFd), sockLayer, sockOpt, policy);
824 if (!isOk(status)) {
825 ALOGE("Error setting socket option for XFRM! (%s)", toString(status).c_str());
826 }
827
828 return status;
829 }
830
ipSecRemoveTransportModeTransform(int socketFd)831 netdutils::Status XfrmController::ipSecRemoveTransportModeTransform(int socketFd) {
832 ALOGD("XfrmController::%s, line=%d", __FUNCTION__, __LINE__);
833
834 StatusOr<sockaddr_storage> ret =
835 getSyscallInstance().getsockname<sockaddr_storage>(Fd(socketFd));
836 if (!isOk(ret)) {
837 ALOGE("Failed to get socket info in %s! (%s)", __FUNCTION__, toString(ret).c_str());
838 return ret;
839 }
840
841 int sockOpt, sockLayer;
842 switch (ret.value().ss_family) {
843 case AF_INET:
844 sockOpt = IP_XFRM_POLICY;
845 sockLayer = SOL_IP;
846 break;
847 case AF_INET6:
848 sockOpt = IPV6_XFRM_POLICY;
849 sockLayer = SOL_IPV6;
850 break;
851 default:
852 return netdutils::statusFromErrno(EAFNOSUPPORT, "Invalid address family");
853 }
854
855 // Kernel will delete the security policy on this socket for both direction
856 // if optval is set to NULL and optlen is set to 0.
857 netdutils::Status status =
858 getSyscallInstance().setsockopt(Fd(socketFd), sockLayer, sockOpt, nullptr, 0);
859 if (!isOk(status)) {
860 ALOGE("Error removing socket option for XFRM! (%s)", toString(status).c_str());
861 }
862
863 return status;
864 }
865
ipSecAddSecurityPolicy(int32_t transformId,int32_t selAddrFamily,int32_t direction,const std::string & tmplSrcAddress,const std::string & tmplDstAddress,int32_t spi,int32_t markValue,int32_t markMask,int32_t xfrmInterfaceId)866 netdutils::Status XfrmController::ipSecAddSecurityPolicy(
867 int32_t transformId, int32_t selAddrFamily, int32_t direction,
868 const std::string& tmplSrcAddress, const std::string& tmplDstAddress, int32_t spi,
869 int32_t markValue, int32_t markMask, int32_t xfrmInterfaceId) {
870 return processSecurityPolicy(transformId, selAddrFamily, direction, tmplSrcAddress,
871 tmplDstAddress, spi, markValue, markMask, xfrmInterfaceId,
872 XFRM_MSG_NEWPOLICY);
873 }
874
ipSecUpdateSecurityPolicy(int32_t transformId,int32_t selAddrFamily,int32_t direction,const std::string & tmplSrcAddress,const std::string & tmplDstAddress,int32_t spi,int32_t markValue,int32_t markMask,int32_t xfrmInterfaceId)875 netdutils::Status XfrmController::ipSecUpdateSecurityPolicy(
876 int32_t transformId, int32_t selAddrFamily, int32_t direction,
877 const std::string& tmplSrcAddress, const std::string& tmplDstAddress, int32_t spi,
878 int32_t markValue, int32_t markMask, int32_t xfrmInterfaceId) {
879 return processSecurityPolicy(transformId, selAddrFamily, direction, tmplSrcAddress,
880 tmplDstAddress, spi, markValue, markMask, xfrmInterfaceId,
881 XFRM_MSG_UPDPOLICY);
882 }
883
ipSecDeleteSecurityPolicy(int32_t transformId,int32_t selAddrFamily,int32_t direction,int32_t markValue,int32_t markMask,int32_t xfrmInterfaceId)884 netdutils::Status XfrmController::ipSecDeleteSecurityPolicy(int32_t transformId,
885 int32_t selAddrFamily,
886 int32_t direction, int32_t markValue,
887 int32_t markMask,
888 int32_t xfrmInterfaceId) {
889 return processSecurityPolicy(transformId, selAddrFamily, direction, "", "", 0, markValue,
890 markMask, xfrmInterfaceId, XFRM_MSG_DELPOLICY);
891 }
892
processSecurityPolicy(int32_t transformId,int32_t selAddrFamily,int32_t direction,const std::string & tmplSrcAddress,const std::string & tmplDstAddress,int32_t spi,int32_t markValue,int32_t markMask,int32_t xfrmInterfaceId,int32_t msgType)893 netdutils::Status XfrmController::processSecurityPolicy(
894 int32_t transformId, int32_t selAddrFamily, int32_t direction,
895 const std::string& tmplSrcAddress, const std::string& tmplDstAddress, int32_t spi,
896 int32_t markValue, int32_t markMask, int32_t xfrmInterfaceId, int32_t msgType) {
897 ALOGD("XfrmController::%s, line=%d", __FUNCTION__, __LINE__);
898 ALOGD("selAddrFamily=%s", selAddrFamily == AF_INET6 ? "AF_INET6" : "AF_INET");
899 ALOGD("transformId=%d", transformId);
900 ALOGD("direction=%d", direction);
901 ALOGD("tmplSrcAddress=%s", tmplSrcAddress.c_str());
902 ALOGD("tmplDstAddress=%s", tmplDstAddress.c_str());
903 ALOGD("spi=%0.8x", spi);
904 ALOGD("markValue=%d", markValue);
905 ALOGD("markMask=%d", markMask);
906 ALOGD("msgType=%d", msgType);
907 ALOGD("xfrmInterfaceId=%d", xfrmInterfaceId);
908
909 XfrmSpInfo spInfo{};
910 spInfo.mode = XfrmMode::TUNNEL;
911
912 XfrmSocketImpl sock;
913 RETURN_IF_NOT_OK(sock.open());
914
915 // Set the correct address families. Tunnel mode policies use wildcard selectors, while
916 // templates have addresses set. These may be different address families. This method is called
917 // separately for IPv4 and IPv6 policies, and thus only need to map a single inner address
918 // family to the outer address families.
919 spInfo.selAddrFamily = selAddrFamily;
920 spInfo.direction = static_cast<XfrmDirection>(direction);
921
922 if (msgType == XFRM_MSG_DELPOLICY) {
923 RETURN_IF_NOT_OK(fillXfrmCommonInfo(spi, markValue, markMask, transformId, xfrmInterfaceId,
924 &spInfo));
925
926 return deleteTunnelModeSecurityPolicy(spInfo, sock);
927 } else {
928 RETURN_IF_NOT_OK(fillXfrmCommonInfo(tmplSrcAddress, tmplDstAddress, spi, markValue,
929 markMask, transformId, xfrmInterfaceId, &spInfo));
930
931 return updateTunnelModeSecurityPolicy(spInfo, sock, msgType);
932 }
933 }
934
fillXfrmSelector(const int selAddrFamily,xfrm_selector * selector)935 void XfrmController::fillXfrmSelector(const int selAddrFamily, xfrm_selector* selector) {
936 selector->family = selAddrFamily;
937 selector->proto = AF_UNSPEC; // TODO: do we need to match the protocol? it's
938 // possible via the socket
939 }
940
updateSecurityAssociation(const XfrmSaInfo & record,const XfrmSocket & sock)941 netdutils::Status XfrmController::updateSecurityAssociation(const XfrmSaInfo& record,
942 const XfrmSocket& sock) {
943 xfrm_usersa_info usersa{};
944 nlattr_algo_crypt crypt{};
945 nlattr_algo_auth auth{};
946 nlattr_algo_aead aead{};
947 nlattr_xfrm_mark xfrmmark{};
948 nlattr_xfrm_output_mark xfrmoutputmark{};
949 nlattr_encap_tmpl encap{};
950 nlattr_xfrm_interface_id xfrm_if_id{};
951
952 enum {
953 NLMSG_HDR,
954 USERSA,
955 USERSA_PAD,
956 CRYPT,
957 CRYPT_PAD,
958 AUTH,
959 AUTH_PAD,
960 AEAD,
961 AEAD_PAD,
962 MARK,
963 MARK_PAD,
964 OUTPUT_MARK,
965 OUTPUT_MARK_PAD,
966 ENCAP,
967 ENCAP_PAD,
968 INTF_ID,
969 INTF_ID_PAD,
970 };
971
972 std::vector<iovec> iov = {
973 {nullptr, 0}, // reserved for the eventual addition of a NLMSG_HDR
974 {&usersa, 0}, // main usersa_info struct
975 {kPadBytes, 0}, // up to NLMSG_ALIGNTO pad bytes of padding
976 {&crypt, 0}, // adjust size if crypt algo is present
977 {kPadBytes, 0}, // up to NLATTR_ALIGNTO pad bytes
978 {&auth, 0}, // adjust size if auth algo is present
979 {kPadBytes, 0}, // up to NLATTR_ALIGNTO pad bytes
980 {&aead, 0}, // adjust size if aead algo is present
981 {kPadBytes, 0}, // up to NLATTR_ALIGNTO pad bytes
982 {&xfrmmark, 0}, // adjust size if xfrm mark is present
983 {kPadBytes, 0}, // up to NLATTR_ALIGNTO pad bytes
984 {&xfrmoutputmark, 0}, // adjust size if xfrm output mark is present
985 {kPadBytes, 0}, // up to NLATTR_ALIGNTO pad bytes
986 {&encap, 0}, // adjust size if encapsulating
987 {kPadBytes, 0}, // up to NLATTR_ALIGNTO pad bytes
988 {&xfrm_if_id, 0}, // adjust size if interface ID is present
989 {kPadBytes, 0}, // up to NLATTR_ALIGNTO pad bytes
990 };
991
992 if (!record.aead.name.empty() && (!record.auth.name.empty() || !record.crypt.name.empty())) {
993 return netdutils::statusFromErrno(EINVAL, "Invalid xfrm algo selection; AEAD is mutually "
994 "exclusive with both Authentication and "
995 "Encryption");
996 }
997
998 if (record.aead.key.size() > MAX_KEY_LENGTH || record.auth.key.size() > MAX_KEY_LENGTH ||
999 record.crypt.key.size() > MAX_KEY_LENGTH) {
1000 return netdutils::statusFromErrno(EINVAL, "Key length invalid; exceeds MAX_KEY_LENGTH");
1001 }
1002
1003 if (record.mode != XfrmMode::TUNNEL &&
1004 (record.xfrm_if_id != 0 || record.netId != 0 || record.mark.v != 0 || record.mark.m != 0)) {
1005 return netdutils::statusFromErrno(EINVAL,
1006 "xfrm_if_id, mark and netid parameters invalid "
1007 "for non tunnel-mode transform");
1008 } else if (record.mode == XfrmMode::TUNNEL && !mIsXfrmIntfSupported && record.xfrm_if_id != 0) {
1009 return netdutils::statusFromErrno(EINVAL, "xfrm_if_id set for VTI Security Association");
1010 }
1011
1012 int len;
1013 len = iov[USERSA].iov_len = fillUserSaInfo(record, &usersa);
1014 iov[USERSA_PAD].iov_len = NLMSG_ALIGN(len) - len;
1015
1016 len = iov[CRYPT].iov_len = fillNlAttrXfrmAlgoEnc(record.crypt, &crypt);
1017 iov[CRYPT_PAD].iov_len = NLA_ALIGN(len) - len;
1018
1019 len = iov[AUTH].iov_len = fillNlAttrXfrmAlgoAuth(record.auth, &auth);
1020 iov[AUTH_PAD].iov_len = NLA_ALIGN(len) - len;
1021
1022 len = iov[AEAD].iov_len = fillNlAttrXfrmAlgoAead(record.aead, &aead);
1023 iov[AEAD_PAD].iov_len = NLA_ALIGN(len) - len;
1024
1025 len = iov[MARK].iov_len = fillNlAttrXfrmMark(record, &xfrmmark);
1026 iov[MARK_PAD].iov_len = NLA_ALIGN(len) - len;
1027
1028 len = iov[OUTPUT_MARK].iov_len = fillNlAttrXfrmOutputMark(record, &xfrmoutputmark);
1029 iov[OUTPUT_MARK_PAD].iov_len = NLA_ALIGN(len) - len;
1030
1031 len = iov[ENCAP].iov_len = fillNlAttrXfrmEncapTmpl(record, &encap);
1032 iov[ENCAP_PAD].iov_len = NLA_ALIGN(len) - len;
1033
1034 len = iov[INTF_ID].iov_len = fillNlAttrXfrmIntfId(record.xfrm_if_id, &xfrm_if_id);
1035 iov[INTF_ID_PAD].iov_len = NLA_ALIGN(len) - len;
1036
1037 return sock.sendMessage(XFRM_MSG_UPDSA, NETLINK_REQUEST_FLAGS, 0, &iov);
1038 }
1039
fillNlAttrXfrmAlgoEnc(const XfrmAlgo & inAlgo,nlattr_algo_crypt * algo)1040 int XfrmController::fillNlAttrXfrmAlgoEnc(const XfrmAlgo& inAlgo, nlattr_algo_crypt* algo) {
1041 if (inAlgo.name.empty()) { // Do not fill anything if algorithm not provided
1042 return 0;
1043 }
1044
1045 int len = NLA_HDRLEN + sizeof(xfrm_algo);
1046 // Kernel always changes last char to null terminator; no safety checks needed.
1047 strncpy(algo->crypt.alg_name, inAlgo.name.c_str(), sizeof(algo->crypt.alg_name));
1048 algo->crypt.alg_key_len = inAlgo.key.size() * 8; // bits
1049 memcpy(algo->key, &inAlgo.key[0], inAlgo.key.size());
1050 len += inAlgo.key.size();
1051 fillXfrmNlaHdr(&algo->hdr, XFRMA_ALG_CRYPT, len);
1052 return len;
1053 }
1054
fillNlAttrXfrmAlgoAuth(const XfrmAlgo & inAlgo,nlattr_algo_auth * algo)1055 int XfrmController::fillNlAttrXfrmAlgoAuth(const XfrmAlgo& inAlgo, nlattr_algo_auth* algo) {
1056 if (inAlgo.name.empty()) { // Do not fill anything if algorithm not provided
1057 return 0;
1058 }
1059
1060 int len = NLA_HDRLEN + sizeof(xfrm_algo_auth);
1061 // Kernel always changes last char to null terminator; no safety checks needed.
1062 strncpy(algo->auth.alg_name, inAlgo.name.c_str(), sizeof(algo->auth.alg_name));
1063 algo->auth.alg_key_len = inAlgo.key.size() * 8; // bits
1064
1065 // This is the extra field for ALG_AUTH_TRUNC
1066 algo->auth.alg_trunc_len = inAlgo.truncLenBits;
1067
1068 memcpy(algo->key, &inAlgo.key[0], inAlgo.key.size());
1069 len += inAlgo.key.size();
1070
1071 fillXfrmNlaHdr(&algo->hdr, XFRMA_ALG_AUTH_TRUNC, len);
1072 return len;
1073 }
1074
fillNlAttrXfrmAlgoAead(const XfrmAlgo & inAlgo,nlattr_algo_aead * algo)1075 int XfrmController::fillNlAttrXfrmAlgoAead(const XfrmAlgo& inAlgo, nlattr_algo_aead* algo) {
1076 if (inAlgo.name.empty()) { // Do not fill anything if algorithm not provided
1077 return 0;
1078 }
1079
1080 int len = NLA_HDRLEN + sizeof(xfrm_algo_aead);
1081 // Kernel always changes last char to null terminator; no safety checks needed.
1082 strncpy(algo->aead.alg_name, inAlgo.name.c_str(), sizeof(algo->aead.alg_name));
1083 algo->aead.alg_key_len = inAlgo.key.size() * 8; // bits
1084
1085 // This is the extra field for ALG_AEAD. ICV length is the same as truncation length
1086 // for any AEAD algorithm.
1087 algo->aead.alg_icv_len = inAlgo.truncLenBits;
1088
1089 memcpy(algo->key, &inAlgo.key[0], inAlgo.key.size());
1090 len += inAlgo.key.size();
1091
1092 fillXfrmNlaHdr(&algo->hdr, XFRMA_ALG_AEAD, len);
1093 return len;
1094 }
1095
fillNlAttrXfrmEncapTmpl(const XfrmSaInfo & record,nlattr_encap_tmpl * tmpl)1096 int XfrmController::fillNlAttrXfrmEncapTmpl(const XfrmSaInfo& record, nlattr_encap_tmpl* tmpl) {
1097 if (record.encap.type == XfrmEncapType::NONE) {
1098 return 0;
1099 }
1100
1101 int len = NLA_HDRLEN + sizeof(xfrm_encap_tmpl);
1102 tmpl->tmpl.encap_type = static_cast<uint16_t>(record.encap.type);
1103 tmpl->tmpl.encap_sport = htons(record.encap.srcPort);
1104 tmpl->tmpl.encap_dport = htons(record.encap.dstPort);
1105 fillXfrmNlaHdr(&tmpl->hdr, XFRMA_ENCAP, len);
1106 return len;
1107 }
1108
fillUserSaInfo(const XfrmSaInfo & record,xfrm_usersa_info * usersa)1109 int XfrmController::fillUserSaInfo(const XfrmSaInfo& record, xfrm_usersa_info* usersa) {
1110 // Use AF_UNSPEC for all SAs. In transport mode, kernel picks selector family based on
1111 // usersa->family, while in tunnel mode, the XFRM_STATE_AF_UNSPEC flag allows dual-stack SAs.
1112 fillXfrmSelector(AF_UNSPEC, &usersa->sel);
1113
1114 usersa->id.proto = IPPROTO_ESP;
1115 usersa->id.spi = record.spi;
1116 usersa->id.daddr = record.dstAddr;
1117
1118 usersa->saddr = record.srcAddr;
1119
1120 fillXfrmLifetimeDefaults(&usersa->lft);
1121 fillXfrmCurLifetimeDefaults(&usersa->curlft);
1122 memset(&usersa->stats, 0, sizeof(usersa->stats)); // leave stats zeroed out
1123 usersa->reqid = record.transformId;
1124 usersa->family = record.addrFamily;
1125 usersa->mode = static_cast<uint8_t>(record.mode);
1126 usersa->replay_window = REPLAY_WINDOW_SIZE;
1127
1128 if (record.mode == XfrmMode::TRANSPORT) {
1129 usersa->flags = 0; // TODO: should we actually set flags, XFRM_SA_XFLAG_DONT_ENCAP_DSCP?
1130 } else {
1131 usersa->flags = XFRM_STATE_AF_UNSPEC;
1132 }
1133
1134 return sizeof(*usersa);
1135 }
1136
fillUserSaId(const XfrmCommonInfo & record,xfrm_usersa_id * said)1137 int XfrmController::fillUserSaId(const XfrmCommonInfo& record, xfrm_usersa_id* said) {
1138 said->daddr = record.dstAddr;
1139 said->spi = record.spi;
1140 said->family = record.addrFamily;
1141 said->proto = IPPROTO_ESP;
1142
1143 return sizeof(*said);
1144 }
1145
deleteSecurityAssociation(const XfrmCommonInfo & record,const XfrmSocket & sock)1146 netdutils::Status XfrmController::deleteSecurityAssociation(const XfrmCommonInfo& record,
1147 const XfrmSocket& sock) {
1148 xfrm_usersa_id said{};
1149 nlattr_xfrm_mark xfrmmark{};
1150 nlattr_xfrm_interface_id xfrm_if_id{};
1151
1152 enum { NLMSG_HDR, USERSAID, USERSAID_PAD, MARK, MARK_PAD, INTF_ID, INTF_ID_PAD };
1153
1154 std::vector<iovec> iov = {
1155 {nullptr, 0}, // reserved for the eventual addition of a NLMSG_HDR
1156 {&said, 0}, // main usersa_info struct
1157 {kPadBytes, 0}, // up to NLMSG_ALIGNTO pad bytes of padding
1158 {&xfrmmark, 0}, // adjust size if xfrm mark is present
1159 {kPadBytes, 0}, // up to NLATTR_ALIGNTO pad bytes
1160 {&xfrm_if_id, 0}, // adjust size if interface ID is present
1161 {kPadBytes, 0}, // up to NLATTR_ALIGNTO pad bytes
1162 };
1163
1164 int len;
1165 len = iov[USERSAID].iov_len = fillUserSaId(record, &said);
1166 iov[USERSAID_PAD].iov_len = NLMSG_ALIGN(len) - len;
1167
1168 len = iov[MARK].iov_len = fillNlAttrXfrmMark(record, &xfrmmark);
1169 iov[MARK_PAD].iov_len = NLA_ALIGN(len) - len;
1170
1171 len = iov[INTF_ID].iov_len = fillNlAttrXfrmIntfId(record.xfrm_if_id, &xfrm_if_id);
1172 iov[INTF_ID_PAD].iov_len = NLA_ALIGN(len) - len;
1173
1174 return sock.sendMessage(XFRM_MSG_DELSA, NETLINK_REQUEST_FLAGS, 0, &iov);
1175 }
1176
migrate(const XfrmMigrateInfo & record,const XfrmSocket & sock)1177 netdutils::Status XfrmController::migrate(const XfrmMigrateInfo& record, const XfrmSocket& sock) {
1178 xfrm_userpolicy_id xfrm_policyid{};
1179 nlattr_xfrm_user_migrate xfrm_migrate{};
1180
1181 __kernel_size_t lenPolicyId = fillUserPolicyId(record, &xfrm_policyid);
1182 __kernel_size_t lenXfrmMigrate = fillNlAttrXfrmMigrate(record, &xfrm_migrate);
1183
1184 std::vector<iovec> iov = {
1185 {nullptr, 0}, // reserved for the eventual addition of a NLMSG_HDR
1186 {&xfrm_policyid, lenPolicyId},
1187 {kPadBytes, NLMSG_ALIGN(lenPolicyId) - lenPolicyId},
1188 {&xfrm_migrate, lenXfrmMigrate},
1189 {kPadBytes, NLMSG_ALIGN(lenXfrmMigrate) - lenXfrmMigrate},
1190 };
1191
1192 return sock.sendMessage(XFRM_MSG_MIGRATE, NETLINK_REQUEST_FLAGS, 0, &iov);
1193 }
1194
allocateSpi(const XfrmSaInfo & record,uint32_t minSpi,uint32_t maxSpi,uint32_t * outSpi,const XfrmSocket & sock)1195 netdutils::Status XfrmController::allocateSpi(const XfrmSaInfo& record, uint32_t minSpi,
1196 uint32_t maxSpi, uint32_t* outSpi,
1197 const XfrmSocket& sock) {
1198 xfrm_userspi_info spiInfo{};
1199
1200 enum { NLMSG_HDR, USERSAID, USERSAID_PAD };
1201
1202 std::vector<iovec> iov = {
1203 {nullptr, 0}, // reserved for the eventual addition of a NLMSG_HDR
1204 {&spiInfo, 0}, // main userspi_info struct
1205 {kPadBytes, 0}, // up to NLMSG_ALIGNTO pad bytes of padding
1206 };
1207
1208 int len;
1209 if (fillUserSaInfo(record, &spiInfo.info) == 0) {
1210 ALOGE("Failed to fill transport SA Info");
1211 }
1212
1213 len = iov[USERSAID].iov_len = sizeof(spiInfo);
1214 iov[USERSAID_PAD].iov_len = NLMSG_ALIGN(len) - len;
1215
1216 RandomSpi spiGen = RandomSpi(minSpi, maxSpi);
1217 int spi;
1218 netdutils::Status ret;
1219 while ((spi = spiGen.next()) != INVALID_SPI) {
1220 spiInfo.min = spi;
1221 spiInfo.max = spi;
1222 ret = sock.sendMessage(XFRM_MSG_ALLOCSPI, NETLINK_REQUEST_FLAGS, 0, &iov);
1223
1224 /* If the SPI is in use, we'll get ENOENT */
1225 if (netdutils::equalToErrno(ret, ENOENT))
1226 continue;
1227
1228 if (isOk(ret)) {
1229 *outSpi = spi;
1230 ALOGD("Allocated an SPI: %x", *outSpi);
1231 } else {
1232 *outSpi = INVALID_SPI;
1233 ALOGE("SPI Allocation Failed with error %d", ret.code());
1234 }
1235
1236 return ret;
1237 }
1238
1239 // Should always be -ENOENT if we get here
1240 return ret;
1241 }
1242
updateTunnelModeSecurityPolicy(const XfrmSpInfo & record,const XfrmSocket & sock,uint16_t msgType)1243 netdutils::Status XfrmController::updateTunnelModeSecurityPolicy(const XfrmSpInfo& record,
1244 const XfrmSocket& sock,
1245 uint16_t msgType) {
1246 xfrm_userpolicy_info userpolicy{};
1247 nlattr_user_tmpl usertmpl{};
1248 nlattr_xfrm_mark xfrmmark{};
1249 nlattr_xfrm_interface_id xfrm_if_id{};
1250
1251 enum {
1252 NLMSG_HDR,
1253 USERPOLICY,
1254 USERPOLICY_PAD,
1255 USERTMPL,
1256 USERTMPL_PAD,
1257 MARK,
1258 MARK_PAD,
1259 INTF_ID,
1260 INTF_ID_PAD,
1261 };
1262
1263 std::vector<iovec> iov = {
1264 {nullptr, 0}, // reserved for the eventual addition of a NLMSG_HDR
1265 {&userpolicy, 0}, // main xfrm_userpolicy_info struct
1266 {kPadBytes, 0}, // up to NLMSG_ALIGNTO pad bytes of padding
1267 {&usertmpl, 0}, // adjust size if xfrm_user_tmpl struct is present
1268 {kPadBytes, 0}, // up to NLATTR_ALIGNTO pad bytes
1269 {&xfrmmark, 0}, // adjust size if xfrm mark is present
1270 {kPadBytes, 0}, // up to NLATTR_ALIGNTO pad bytes
1271 {&xfrm_if_id, 0}, // adjust size if interface ID is present
1272 {kPadBytes, 0}, // up to NLATTR_ALIGNTO pad bytes
1273 };
1274
1275 int len;
1276 len = iov[USERPOLICY].iov_len = fillUserSpInfo(record, &userpolicy);
1277 iov[USERPOLICY_PAD].iov_len = NLMSG_ALIGN(len) - len;
1278
1279 len = iov[USERTMPL].iov_len = fillNlAttrUserTemplate(record, &usertmpl);
1280 iov[USERTMPL_PAD].iov_len = NLA_ALIGN(len) - len;
1281
1282 len = iov[MARK].iov_len = fillNlAttrXfrmMark(record, &xfrmmark);
1283 iov[MARK_PAD].iov_len = NLA_ALIGN(len) - len;
1284
1285 len = iov[INTF_ID].iov_len = fillNlAttrXfrmIntfId(record.xfrm_if_id, &xfrm_if_id);
1286 iov[INTF_ID_PAD].iov_len = NLA_ALIGN(len) - len;
1287
1288 return sock.sendMessage(msgType, NETLINK_REQUEST_FLAGS, 0, &iov);
1289 }
1290
deleteTunnelModeSecurityPolicy(const XfrmSpInfo & record,const XfrmSocket & sock)1291 netdutils::Status XfrmController::deleteTunnelModeSecurityPolicy(const XfrmSpInfo& record,
1292 const XfrmSocket& sock) {
1293 xfrm_userpolicy_id policyid{};
1294 nlattr_xfrm_mark xfrmmark{};
1295 nlattr_xfrm_interface_id xfrm_if_id{};
1296
1297 enum {
1298 NLMSG_HDR,
1299 USERPOLICYID,
1300 USERPOLICYID_PAD,
1301 MARK,
1302 MARK_PAD,
1303 INTF_ID,
1304 INTF_ID_PAD,
1305 };
1306
1307 std::vector<iovec> iov = {
1308 {nullptr, 0}, // reserved for the eventual addition of a NLMSG_HDR
1309 {&policyid, 0}, // main xfrm_userpolicy_id struct
1310 {kPadBytes, 0}, // up to NLMSG_ALIGNTO pad bytes of padding
1311 {&xfrmmark, 0}, // adjust size if xfrm mark is present
1312 {kPadBytes, 0}, // up to NLATTR_ALIGNTO pad bytes
1313 {&xfrm_if_id, 0}, // adjust size if interface ID is present
1314 {kPadBytes, 0}, // up to NLATTR_ALIGNTO pad bytes
1315 };
1316
1317 int len = iov[USERPOLICYID].iov_len = fillUserPolicyId(record, &policyid);
1318 iov[USERPOLICYID_PAD].iov_len = NLMSG_ALIGN(len) - len;
1319
1320 len = iov[MARK].iov_len = fillNlAttrXfrmMark(record, &xfrmmark);
1321 iov[MARK_PAD].iov_len = NLA_ALIGN(len) - len;
1322
1323 len = iov[INTF_ID].iov_len = fillNlAttrXfrmIntfId(record.xfrm_if_id, &xfrm_if_id);
1324 iov[INTF_ID_PAD].iov_len = NLA_ALIGN(len) - len;
1325
1326 return sock.sendMessage(XFRM_MSG_DELPOLICY, NETLINK_REQUEST_FLAGS, 0, &iov);
1327 }
1328
fillUserSpInfo(const XfrmSpInfo & record,xfrm_userpolicy_info * usersp)1329 int XfrmController::fillUserSpInfo(const XfrmSpInfo& record, xfrm_userpolicy_info* usersp) {
1330 fillXfrmSelector(record.selAddrFamily, &usersp->sel);
1331 fillXfrmLifetimeDefaults(&usersp->lft);
1332 fillXfrmCurLifetimeDefaults(&usersp->curlft);
1333 /* if (index) index & 0x3 == dir -- must be true
1334 * xfrm_user.c:verify_newpolicy_info() */
1335 usersp->index = 0;
1336 usersp->dir = static_cast<uint8_t>(record.direction);
1337 usersp->action = XFRM_POLICY_ALLOW;
1338 usersp->flags = XFRM_POLICY_LOCALOK;
1339 usersp->share = XFRM_SHARE_UNIQUE;
1340 return sizeof(*usersp);
1341 }
1342
fillUserTemplate(const XfrmSpInfo & record,xfrm_user_tmpl * tmpl)1343 void XfrmController::fillUserTemplate(const XfrmSpInfo& record, xfrm_user_tmpl* tmpl) {
1344 tmpl->id.daddr = record.dstAddr;
1345 tmpl->id.spi = record.spi;
1346 tmpl->id.proto = IPPROTO_ESP;
1347
1348 tmpl->family = record.addrFamily;
1349 tmpl->saddr = record.srcAddr;
1350 tmpl->reqid = record.transformId;
1351 tmpl->mode = static_cast<uint8_t>(record.mode);
1352 tmpl->share = XFRM_SHARE_UNIQUE;
1353 tmpl->optional = 0; // if this is true, then a failed state lookup will be considered OK:
1354 // http://lxr.free-electrons.com/source/net/xfrm/xfrm_policy.c#L1492
1355 tmpl->aalgos = ALGO_MASK_AUTH_ALL; // TODO: if there's a bitmask somewhere of
1356 // algos, we should find it and apply it.
1357 // I can't find one.
1358 tmpl->ealgos = ALGO_MASK_CRYPT_ALL; // TODO: if there's a bitmask somewhere...
1359 }
1360
fillNlAttrUserTemplate(const XfrmSpInfo & record,nlattr_user_tmpl * tmpl)1361 int XfrmController::fillNlAttrUserTemplate(const XfrmSpInfo& record, nlattr_user_tmpl* tmpl) {
1362 fillUserTemplate(record, &tmpl->tmpl);
1363
1364 int len = NLA_HDRLEN + sizeof(xfrm_user_tmpl);
1365 fillXfrmNlaHdr(&tmpl->hdr, XFRMA_TMPL, len);
1366 return len;
1367 }
1368
fillNlAttrXfrmMark(const XfrmCommonInfo & record,nlattr_xfrm_mark * mark)1369 int XfrmController::fillNlAttrXfrmMark(const XfrmCommonInfo& record, nlattr_xfrm_mark* mark) {
1370 // Do not set if we were not given a mark
1371 if (record.mark.v == 0 && record.mark.m == 0) {
1372 return 0;
1373 }
1374
1375 mark->mark.v = record.mark.v; // set to 0 if it's not used
1376 mark->mark.m = record.mark.m; // set to 0 if it's not used
1377 int len = NLA_HDRLEN + sizeof(xfrm_mark);
1378 fillXfrmNlaHdr(&mark->hdr, XFRMA_MARK, len);
1379 return len;
1380 }
1381
1382 // This function sets the output mark (or set-mark in newer kernels) to that of the underlying
1383 // Network's netid. This allows outbound IPsec Tunnel mode packets to be correctly directed to a
1384 // preselected underlying Network. Outbound packets are marked as protected from VPNs and have a
1385 // network explicitly selected to prevent interference or routing loops. Also sets permission flag
1386 // to PERMISSION_SYSTEM to allow use of background/restricted networks. Inbound packets have all
1387 // the flags and fields cleared to simulate the decapsulated packet being a fresh, unseen packet.
fillNlAttrXfrmOutputMark(const XfrmSaInfo & record,nlattr_xfrm_output_mark * output_mark)1388 int XfrmController::fillNlAttrXfrmOutputMark(const XfrmSaInfo& record,
1389 nlattr_xfrm_output_mark* output_mark) {
1390 // Only set for tunnel mode transforms
1391 if (record.mode != XfrmMode::TUNNEL) {
1392 return 0;
1393 }
1394
1395 Fwmark fwmark;
1396
1397 // Only outbound transforms have an underlying network set.
1398 if (record.netId != 0) {
1399 fwmark.netId = record.netId;
1400 fwmark.permission = PERMISSION_SYSTEM;
1401 fwmark.explicitlySelected = true;
1402 fwmark.protectedFromVpn = true;
1403 }
1404
1405 // Else (inbound transforms), reset to default mark (empty); UID billing for inbound tunnel mode
1406 // transforms are exclusively done on inner packet, and therefore can never have been set.
1407
1408 output_mark->outputMark = fwmark.intValue;
1409
1410 int len = NLA_HDRLEN + sizeof(__u32);
1411 fillXfrmNlaHdr(&output_mark->hdr, XFRMA_OUTPUT_MARK, len);
1412 return len;
1413 }
1414
fillNlAttrXfrmIntfId(const uint32_t intfIdValue,nlattr_xfrm_interface_id * intf_id)1415 int XfrmController::fillNlAttrXfrmIntfId(const uint32_t intfIdValue,
1416 nlattr_xfrm_interface_id* intf_id) {
1417 // Do not set if we were not given an interface id
1418 if (intfIdValue == 0) {
1419 return 0;
1420 }
1421
1422 intf_id->if_id = intfIdValue;
1423 int len = NLA_HDRLEN + sizeof(__u32);
1424 fillXfrmNlaHdr(&intf_id->hdr, XFRMA_IF_ID, len);
1425 return len;
1426 }
1427
fillNlAttrXfrmMigrate(const XfrmMigrateInfo & record,nlattr_xfrm_user_migrate * migrate)1428 int XfrmController::fillNlAttrXfrmMigrate(const XfrmMigrateInfo& record,
1429 nlattr_xfrm_user_migrate* migrate) {
1430 migrate->migrate.old_daddr = record.dstAddr;
1431 migrate->migrate.old_saddr = record.srcAddr;
1432 migrate->migrate.new_daddr = record.newEndpointInfo.dstAddr;
1433 migrate->migrate.new_saddr = record.newEndpointInfo.srcAddr;
1434 migrate->migrate.proto = IPPROTO_ESP;
1435 migrate->migrate.mode = static_cast<uint8_t>(XfrmMode::TUNNEL);
1436 migrate->migrate.reqid = record.transformId;
1437 migrate->migrate.old_family = record.addrFamily;
1438 migrate->migrate.new_family = record.newEndpointInfo.addrFamily;
1439
1440 int len = NLA_HDRLEN + sizeof(xfrm_user_migrate);
1441 fillXfrmNlaHdr(&migrate->hdr, XFRMA_MIGRATE, len);
1442
1443 return len;
1444 }
1445
fillUserPolicyId(const XfrmSpInfo & record,xfrm_userpolicy_id * usersp)1446 int XfrmController::fillUserPolicyId(const XfrmSpInfo& record, xfrm_userpolicy_id* usersp) {
1447 // For DELPOLICY, when index is absent, selector is needed to match the policy
1448 fillXfrmSelector(record.selAddrFamily, &usersp->sel);
1449 usersp->dir = static_cast<uint8_t>(record.direction);
1450 return sizeof(*usersp);
1451 }
1452
ipSecAddTunnelInterface(const std::string & deviceName,const std::string & localAddress,const std::string & remoteAddress,int32_t ikey,int32_t okey,int32_t interfaceId,bool isUpdate)1453 netdutils::Status XfrmController::ipSecAddTunnelInterface(const std::string& deviceName,
1454 const std::string& localAddress,
1455 const std::string& remoteAddress,
1456 int32_t ikey, int32_t okey,
1457 int32_t interfaceId, bool isUpdate) {
1458 ALOGD("XfrmController::%s, line=%d", __FUNCTION__, __LINE__);
1459 ALOGD("deviceName=%s", deviceName.c_str());
1460 ALOGD("localAddress=%s", localAddress.c_str());
1461 ALOGD("remoteAddress=%s", remoteAddress.c_str());
1462 ALOGD("ikey=%0.8x", ikey);
1463 ALOGD("okey=%0.8x", okey);
1464 ALOGD("interfaceId=%0.8x", interfaceId);
1465 ALOGD("isUpdate=%d", isUpdate);
1466
1467 uint16_t flags = isUpdate ? NETLINK_REQUEST_FLAGS : NETLINK_ROUTE_CREATE_FLAGS;
1468
1469 if (mIsXfrmIntfSupported) {
1470 return ipSecAddXfrmInterface(deviceName, interfaceId, flags);
1471 } else {
1472 return ipSecAddVirtualTunnelInterface(deviceName, localAddress, remoteAddress, ikey, okey,
1473 flags);
1474 }
1475 }
1476
ipSecAddXfrmInterface(const std::string & deviceName,int32_t interfaceId,uint16_t flags)1477 netdutils::Status XfrmController::ipSecAddXfrmInterface(const std::string& deviceName,
1478 int32_t interfaceId, uint16_t flags) {
1479 ALOGD("XfrmController::%s, line=%d", __FUNCTION__, __LINE__);
1480
1481 if (deviceName.empty()) {
1482 return netdutils::statusFromErrno(EINVAL, "XFRM Interface deviceName empty");
1483 }
1484
1485 ifinfomsg ifInfoMsg{};
1486
1487 struct XfrmIntfCreateReq {
1488 nlattr ifNameNla;
1489 char ifName[IFNAMSIZ]; // Already aligned
1490
1491 nlattr linkInfoNla;
1492 struct LinkInfo {
1493 nlattr infoKindNla;
1494 char infoKind[INFO_KIND_MAX_LEN]; // Already aligned
1495
1496 nlattr infoDataNla;
1497 struct InfoData {
1498 nlattr xfrmLinkNla;
1499 uint32_t xfrmLink;
1500
1501 nlattr xfrmIfIdNla;
1502 uint32_t xfrmIfId;
1503 } infoData; // Already aligned
1504
1505 } linkInfo; // Already aligned
1506 } xfrmIntfCreateReq{
1507 .ifNameNla =
1508 {
1509 .nla_len = RTA_LENGTH(IFNAMSIZ),
1510 .nla_type = IFLA_IFNAME,
1511 },
1512 // Update .ifName via strlcpy
1513
1514 .linkInfoNla =
1515 {
1516 .nla_len = RTA_LENGTH(sizeof(XfrmIntfCreateReq::LinkInfo)),
1517 .nla_type = IFLA_LINKINFO,
1518 },
1519 .linkInfo = {.infoKindNla =
1520 {
1521 .nla_len = RTA_LENGTH(INFO_KIND_MAX_LEN),
1522 .nla_type = IFLA_INFO_KIND,
1523 },
1524 // Update .infoKind via strlcpy
1525
1526 .infoDataNla =
1527 {
1528 .nla_len = RTA_LENGTH(
1529 sizeof(XfrmIntfCreateReq::LinkInfo::InfoData)),
1530 .nla_type = IFLA_INFO_DATA,
1531 },
1532 .infoData = {
1533 .xfrmLinkNla =
1534 {
1535 .nla_len = RTA_LENGTH(sizeof(uint32_t)),
1536 .nla_type = IFLA_XFRM_LINK,
1537 },
1538 // Always use LOOPBACK_IFINDEX, since we use output marks for
1539 // route lookup instead. The use case of having a Network with
1540 // loopback in it is unsupported in tunnel mode.
1541 .xfrmLink = static_cast<uint32_t>(LOOPBACK_IFINDEX),
1542
1543 .xfrmIfIdNla =
1544 {
1545 .nla_len = RTA_LENGTH(sizeof(uint32_t)),
1546 .nla_type = IFLA_XFRM_IF_ID,
1547 },
1548 .xfrmIfId = static_cast<uint32_t>(interfaceId),
1549 }}};
1550
1551 strlcpy(xfrmIntfCreateReq.ifName, deviceName.c_str(), IFNAMSIZ);
1552 strlcpy(xfrmIntfCreateReq.linkInfo.infoKind, INFO_KIND_XFRMI, INFO_KIND_MAX_LEN);
1553
1554 iovec iov[] = {
1555 {NULL, 0}, // reserved for the eventual addition of a NLMSG_HDR
1556 {&ifInfoMsg, sizeof(ifInfoMsg)},
1557
1558 {&xfrmIntfCreateReq, sizeof(xfrmIntfCreateReq)},
1559 };
1560
1561 // sendNetlinkRequest returns -errno
1562 int ret = -sendNetlinkRequest(RTM_NEWLINK, flags, iov, ARRAY_SIZE(iov), nullptr);
1563 return netdutils::statusFromErrno(ret, "Add/update xfrm interface");
1564 }
1565
ipSecAddVirtualTunnelInterface(const std::string & deviceName,const std::string & localAddress,const std::string & remoteAddress,int32_t ikey,int32_t okey,uint16_t flags)1566 netdutils::Status XfrmController::ipSecAddVirtualTunnelInterface(const std::string& deviceName,
1567 const std::string& localAddress,
1568 const std::string& remoteAddress,
1569 int32_t ikey, int32_t okey,
1570 uint16_t flags) {
1571 ALOGD("XfrmController::%s, line=%d", __FUNCTION__, __LINE__);
1572
1573 if (deviceName.empty() || localAddress.empty() || remoteAddress.empty()) {
1574 return netdutils::statusFromErrno(EINVAL, "Required VTI creation parameter not provided");
1575 }
1576
1577 uint8_t PADDING_BUFFER[] = {0, 0, 0, 0};
1578
1579 // Find address family.
1580 uint8_t remAddr[sizeof(in6_addr)];
1581
1582 StatusOr<uint16_t> statusOrRemoteFam = convertStringAddress(remoteAddress, remAddr);
1583 RETURN_IF_NOT_OK(statusOrRemoteFam);
1584
1585 uint8_t locAddr[sizeof(in6_addr)];
1586 StatusOr<uint16_t> statusOrLocalFam = convertStringAddress(localAddress, locAddr);
1587 RETURN_IF_NOT_OK(statusOrLocalFam);
1588
1589 if (statusOrLocalFam.value() != statusOrRemoteFam.value()) {
1590 return netdutils::statusFromErrno(EINVAL, "Local and remote address families do not match");
1591 }
1592
1593 uint16_t family = statusOrLocalFam.value();
1594
1595 ifinfomsg ifInfoMsg{};
1596
1597 // Construct IFLA_IFNAME
1598 nlattr iflaIfName;
1599 char iflaIfNameStrValue[deviceName.length() + 1];
1600 size_t iflaIfNameLength =
1601 strlcpy(iflaIfNameStrValue, deviceName.c_str(), sizeof(iflaIfNameStrValue));
1602 size_t iflaIfNamePad = fillNlAttr(IFLA_IFNAME, iflaIfNameLength, &iflaIfName);
1603
1604 // Construct IFLA_INFO_KIND
1605 // Constants "vti6" and "vti" enable the kernel to call different code paths,
1606 // (ip_tunnel.c, ip6_tunnel), based on the family.
1607 const std::string infoKindValue = (family == AF_INET6) ? INFO_KIND_VTI6 : INFO_KIND_VTI;
1608 nlattr iflaIfInfoKind;
1609 char infoKindValueStrValue[infoKindValue.length() + 1];
1610 size_t iflaIfInfoKindLength =
1611 strlcpy(infoKindValueStrValue, infoKindValue.c_str(), sizeof(infoKindValueStrValue));
1612 size_t iflaIfInfoKindPad = fillNlAttr(IFLA_INFO_KIND, iflaIfInfoKindLength, &iflaIfInfoKind);
1613
1614 // Construct IFLA_VTI_LOCAL
1615 nlattr iflaVtiLocal;
1616 uint8_t binaryLocalAddress[sizeof(in6_addr)];
1617 size_t iflaVtiLocalPad =
1618 fillNlAttrIpAddress(IFLA_VTI_LOCAL, family, localAddress, &iflaVtiLocal,
1619 netdutils::makeSlice(binaryLocalAddress));
1620
1621 // Construct IFLA_VTI_REMOTE
1622 nlattr iflaVtiRemote;
1623 uint8_t binaryRemoteAddress[sizeof(in6_addr)];
1624 size_t iflaVtiRemotePad =
1625 fillNlAttrIpAddress(IFLA_VTI_REMOTE, family, remoteAddress, &iflaVtiRemote,
1626 netdutils::makeSlice(binaryRemoteAddress));
1627
1628 // Construct IFLA_VTI_OKEY
1629 nlattr_payload_u32 iflaVtiIKey;
1630 size_t iflaVtiIKeyPad = fillNlAttrU32(IFLA_VTI_IKEY, htonl(ikey), &iflaVtiIKey);
1631
1632 // Construct IFLA_VTI_IKEY
1633 nlattr_payload_u32 iflaVtiOKey;
1634 size_t iflaVtiOKeyPad = fillNlAttrU32(IFLA_VTI_OKEY, htonl(okey), &iflaVtiOKey);
1635
1636 int iflaInfoDataPayloadLength = iflaVtiLocal.nla_len + iflaVtiLocalPad + iflaVtiRemote.nla_len +
1637 iflaVtiRemotePad + iflaVtiIKey.hdr.nla_len + iflaVtiIKeyPad +
1638 iflaVtiOKey.hdr.nla_len + iflaVtiOKeyPad;
1639
1640 // Construct IFLA_INFO_DATA
1641 nlattr iflaInfoData;
1642 size_t iflaInfoDataPad = fillNlAttr(IFLA_INFO_DATA, iflaInfoDataPayloadLength, &iflaInfoData);
1643
1644 // Construct IFLA_LINKINFO
1645 nlattr iflaLinkInfo;
1646 size_t iflaLinkInfoPad = fillNlAttr(IFLA_LINKINFO,
1647 iflaInfoData.nla_len + iflaInfoDataPad +
1648 iflaIfInfoKind.nla_len + iflaIfInfoKindPad,
1649 &iflaLinkInfo);
1650
1651 iovec iov[] = {
1652 {nullptr, 0},
1653 {&ifInfoMsg, sizeof(ifInfoMsg)},
1654
1655 {&iflaIfName, sizeof(iflaIfName)},
1656 {iflaIfNameStrValue, iflaIfNameLength},
1657 {&PADDING_BUFFER, iflaIfNamePad},
1658
1659 {&iflaLinkInfo, sizeof(iflaLinkInfo)},
1660
1661 {&iflaIfInfoKind, sizeof(iflaIfInfoKind)},
1662 {infoKindValueStrValue, iflaIfInfoKindLength},
1663 {&PADDING_BUFFER, iflaIfInfoKindPad},
1664
1665 {&iflaInfoData, sizeof(iflaInfoData)},
1666
1667 {&iflaVtiLocal, sizeof(iflaVtiLocal)},
1668 {&binaryLocalAddress, (family == AF_INET) ? sizeof(in_addr) : sizeof(in6_addr)},
1669 {&PADDING_BUFFER, iflaVtiLocalPad},
1670
1671 {&iflaVtiRemote, sizeof(iflaVtiRemote)},
1672 {&binaryRemoteAddress, (family == AF_INET) ? sizeof(in_addr) : sizeof(in6_addr)},
1673 {&PADDING_BUFFER, iflaVtiRemotePad},
1674
1675 {&iflaVtiIKey, iflaVtiIKey.hdr.nla_len},
1676 {&PADDING_BUFFER, iflaVtiIKeyPad},
1677
1678 {&iflaVtiOKey, iflaVtiOKey.hdr.nla_len},
1679 {&PADDING_BUFFER, iflaVtiOKeyPad},
1680
1681 {&PADDING_BUFFER, iflaInfoDataPad},
1682
1683 {&PADDING_BUFFER, iflaLinkInfoPad},
1684 };
1685
1686 // sendNetlinkRequest returns -errno
1687 int ret = -1 * sendNetlinkRequest(RTM_NEWLINK, flags, iov, ARRAY_SIZE(iov), nullptr);
1688 return netdutils::statusFromErrno(ret, "Failed to add/update virtual tunnel interface");
1689 }
1690
ipSecRemoveTunnelInterface(const std::string & deviceName)1691 netdutils::Status XfrmController::ipSecRemoveTunnelInterface(const std::string& deviceName) {
1692 ALOGD("XfrmController::%s, line=%d", __FUNCTION__, __LINE__);
1693 ALOGD("deviceName=%s", deviceName.c_str());
1694
1695 if (deviceName.empty()) {
1696 return netdutils::statusFromErrno(EINVAL, "Required parameter not provided");
1697 }
1698
1699 uint8_t PADDING_BUFFER[] = {0, 0, 0, 0};
1700
1701 ifinfomsg ifInfoMsg{};
1702 nlattr iflaIfName;
1703 char iflaIfNameStrValue[deviceName.length() + 1];
1704 size_t iflaIfNameLength =
1705 strlcpy(iflaIfNameStrValue, deviceName.c_str(), sizeof(iflaIfNameStrValue));
1706 size_t iflaIfNamePad = fillNlAttr(IFLA_IFNAME, iflaIfNameLength, &iflaIfName);
1707
1708 iovec iov[] = {
1709 {nullptr, 0},
1710 {&ifInfoMsg, sizeof(ifInfoMsg)},
1711
1712 {&iflaIfName, sizeof(iflaIfName)},
1713 {iflaIfNameStrValue, iflaIfNameLength},
1714 {&PADDING_BUFFER, iflaIfNamePad},
1715 };
1716
1717 uint16_t action = RTM_DELLINK;
1718 uint16_t flags = NLM_F_REQUEST | NLM_F_ACK;
1719
1720 // sendNetlinkRequest returns -errno
1721 int ret = -1 * sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov), nullptr);
1722 return netdutils::statusFromErrno(ret, "Error in deleting IpSec interface " + deviceName);
1723 }
1724
dump(DumpWriter & dw)1725 void XfrmController::dump(DumpWriter& dw) {
1726 ScopedIndent indentForXfrmController(dw);
1727 dw.println("XfrmController");
1728
1729 ScopedIndent indentForXfrmISupport(dw);
1730 dw.println("XFRM-I support: %d", mIsXfrmIntfSupported);
1731 }
1732
1733 } // namespace net
1734 } // namespace android
1735