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rxrpc: Trace protocol errors in received packets

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Add a tracepoint (rxrpc_rx_proto) to record protocol errors in received
packets.  The following changes are made:

 (1) Add a function, __rxrpc_abort_eproto(), to note a protocol error on a
     call and mark the call aborted.  This is wrapped by
     rxrpc_abort_eproto() that makes the why string usable in trace.

 (2) Add trace_rxrpc_rx_proto() or rxrpc_abort_eproto() to protocol error
     generation points, replacing rxrpc_abort_call() with the latter.

 (3) Only send an abort packet in rxkad_verify_packet*() if we actually
     managed to abort the call.

Note that a trace event is also emitted if a kernel user (e.g. afs) tries
to send data through a call when it's not in the transmission phase, though
it's not technically a receive event.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells 2017-04-06 10:12:00 +01:00
parent ef68622da9
commit fb46f6ee10
8 changed files with 138 additions and 40 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
include/trace/events/rxrpc.h
View File

@ -1087,6 +1087,30 @@ TRACE_EVENT(rxrpc_improper_term,
__entry->abort_code)
);
TRACE_EVENT(rxrpc_rx_eproto,
TP_PROTO(struct rxrpc_call *call, rxrpc_serial_t serial,
const char *why),
TP_ARGS(call, serial, why),
TP_STRUCT__entry(
__field(struct rxrpc_call *, call )
__field(rxrpc_serial_t, serial )
__field(const char *, why )
),
TP_fast_assign(
__entry->call = call;
__entry->serial = serial;
__entry->why = why;
),
TP_printk("c=%p EPROTO %08x %s",
__entry->call,
__entry->serial,
__entry->why)
);
#endif /* _TRACE_RXRPC_H */
/* This part must be outside protection */

19
net/rxrpc/ar-internal.h
View File

@ -739,6 +739,25 @@ static inline bool rxrpc_abort_call(const char *why, struct rxrpc_call *call,
return ret;
}
/*
* Abort a call due to a protocol error.
*/
static inline bool __rxrpc_abort_eproto(struct rxrpc_call *call,
struct sk_buff *skb,
const char *eproto_why,
const char *why,
u32 abort_code)
{
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
trace_rxrpc_rx_eproto(call, sp->hdr.serial, eproto_why);
return rxrpc_abort_call(why, call, sp->hdr.seq, abort_code, -EPROTO);
}
#define rxrpc_abort_eproto(call, skb, eproto_why, abort_why, abort_code) \
__rxrpc_abort_eproto((call), (skb), tracepoint_string(eproto_why), \
(abort_why), (abort_code))
/*
* conn_client.c
*/

9
net/rxrpc/conn_event.c
View File

@ -281,8 +281,11 @@ static int rxrpc_process_event(struct rxrpc_connection *conn,
case RXRPC_PACKET_TYPE_ABORT:
if (skb_copy_bits(skb, sizeof(struct rxrpc_wire_header),
&wtmp, sizeof(wtmp)) < 0)
&wtmp, sizeof(wtmp)) < 0) {
trace_rxrpc_rx_eproto(NULL, sp->hdr.serial,
tracepoint_string("bad_abort"));
return -EPROTO;
}
abort_code = ntohl(wtmp);
_proto("Rx ABORT %%%u { ac=%d }", sp->hdr.serial, abort_code);
@ -327,7 +330,8 @@ static int rxrpc_process_event(struct rxrpc_connection *conn,
return 0;
default:
_leave(" = -EPROTO [%u]", sp->hdr.type);
trace_rxrpc_rx_eproto(NULL, sp->hdr.serial,
tracepoint_string("bad_conn_pkt"));
return -EPROTO;
}
}
@ -422,6 +426,5 @@ protocol_error:
if (rxrpc_abort_connection(conn, ret, abort_code) < 0)
goto requeue_and_leave;
rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
_leave(" [EPROTO]");
goto out;
}

5
net/rxrpc/input.c
View File

@ -1017,8 +1017,11 @@ int rxrpc_extract_header(struct rxrpc_skb_priv *sp, struct sk_buff *skb)
struct rxrpc_wire_header whdr;
/* dig out the RxRPC connection details */
if (skb_copy_bits(skb, 0, &whdr, sizeof(whdr)) < 0)
if (skb_copy_bits(skb, 0, &whdr, sizeof(whdr)) < 0) {
trace_rxrpc_rx_eproto(NULL, sp->hdr.serial,
tracepoint_string("bad_hdr"));
return -EBADMSG;
}
memset(sp, 0, sizeof(*sp));
sp->hdr.epoch = ntohl(whdr.epoch);

10
net/rxrpc/insecure.c
View File

@ -46,7 +46,10 @@ static int none_respond_to_challenge(struct rxrpc_connection *conn,
struct sk_buff *skb,
u32 *_abort_code)
{
*_abort_code = RX_PROTOCOL_ERROR;
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
trace_rxrpc_rx_eproto(NULL, sp->hdr.serial,
tracepoint_string("chall_none"));
return -EPROTO;
}
@ -54,7 +57,10 @@ static int none_verify_response(struct rxrpc_connection *conn,
struct sk_buff *skb,
u32 *_abort_code)
{
*_abort_code = RX_PROTOCOL_ERROR;
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
trace_rxrpc_rx_eproto(NULL, sp->hdr.serial,
tracepoint_string("resp_none"));
return -EPROTO;
}

2
net/rxrpc/recvmsg.c
View File

@ -682,9 +682,11 @@ out:
return ret;
short_data:
trace_rxrpc_rx_eproto(call, 0, tracepoint_string("short_data"));
ret = -EBADMSG;
goto out;
excess_data:
trace_rxrpc_rx_eproto(call, 0, tracepoint_string("excess_data"));
ret = -EMSGSIZE;
goto out;
call_complete:

106
net/rxrpc/rxkad.c
View File

@ -148,15 +148,13 @@ static int rxkad_secure_packet_auth(const struct rxrpc_call *call,
u32 data_size,
void *sechdr)
{
struct rxrpc_skb_priv *sp;
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
SKCIPHER_REQUEST_ON_STACK(req, call->conn->cipher);
struct rxkad_level1_hdr hdr;
struct rxrpc_crypt iv;
struct scatterlist sg;
u16 check;
sp = rxrpc_skb(skb);
_enter("");
check = sp->hdr.seq ^ call->call_id;
@ -323,6 +321,7 @@ static int rxkad_verify_packet_1(struct rxrpc_call *call, struct sk_buff *skb,
struct rxrpc_crypt iv;
struct scatterlist sg[16];
struct sk_buff *trailer;
bool aborted;
u32 data_size, buf;
u16 check;
int nsg;
@ -330,7 +329,8 @@ static int rxkad_verify_packet_1(struct rxrpc_call *call, struct sk_buff *skb,
_enter("");
if (len < 8) {
rxrpc_abort_call("V1H", call, seq, RXKADSEALEDINCON, -EPROTO);
aborted = rxrpc_abort_eproto(call, skb, "rxkad_1_hdr", "V1H",
RXKADSEALEDINCON);
goto protocol_error;
}
@ -355,7 +355,8 @@ static int rxkad_verify_packet_1(struct rxrpc_call *call, struct sk_buff *skb,
/* Extract the decrypted packet length */
if (skb_copy_bits(skb, offset, &sechdr, sizeof(sechdr)) < 0) {
rxrpc_abort_call("XV1", call, seq, RXKADDATALEN, -EPROTO);
aborted = rxrpc_abort_eproto(call, skb, "rxkad_1_len", "XV1",
RXKADDATALEN);
goto protocol_error;
}
offset += sizeof(sechdr);
@ -368,12 +369,14 @@ static int rxkad_verify_packet_1(struct rxrpc_call *call, struct sk_buff *skb,
check ^= seq ^ call->call_id;
check &= 0xffff;
if (check != 0) {
rxrpc_abort_call("V1C", call, seq, RXKADSEALEDINCON, -EPROTO);
aborted = rxrpc_abort_eproto(call, skb, "rxkad_1_check", "V1C",
RXKADSEALEDINCON);
goto protocol_error;
}
if (data_size > len) {
rxrpc_abort_call("V1L", call, seq, RXKADDATALEN, -EPROTO);
aborted = rxrpc_abort_eproto(call, skb, "rxkad_1_datalen", "V1L",
RXKADDATALEN);
goto protocol_error;
}
@ -381,8 +384,8 @@ static int rxkad_verify_packet_1(struct rxrpc_call *call, struct sk_buff *skb,
return 0;
protocol_error:
rxrpc_send_abort_packet(call);
_leave(" = -EPROTO");
if (aborted)
rxrpc_send_abort_packet(call);
return -EPROTO;
nomem:
@ -403,6 +406,7 @@ static int rxkad_verify_packet_2(struct rxrpc_call *call, struct sk_buff *skb,
struct rxrpc_crypt iv;
struct scatterlist _sg[4], *sg;
struct sk_buff *trailer;
bool aborted;
u32 data_size, buf;
u16 check;
int nsg;
@ -410,7 +414,8 @@ static int rxkad_verify_packet_2(struct rxrpc_call *call, struct sk_buff *skb,
_enter(",{%d}", skb->len);
if (len < 8) {
rxrpc_abort_call("V2H", call, seq, RXKADSEALEDINCON, -EPROTO);
aborted = rxrpc_abort_eproto(call, skb, "rxkad_2_hdr", "V2H",
RXKADSEALEDINCON);
goto protocol_error;
}
@ -445,7 +450,8 @@ static int rxkad_verify_packet_2(struct rxrpc_call *call, struct sk_buff *skb,
/* Extract the decrypted packet length */
if (skb_copy_bits(skb, offset, &sechdr, sizeof(sechdr)) < 0) {
rxrpc_abort_call("XV2", call, seq, RXKADDATALEN, -EPROTO);
aborted = rxrpc_abort_eproto(call, skb, "rxkad_2_len", "XV2",
RXKADDATALEN);
goto protocol_error;
}
offset += sizeof(sechdr);
@ -458,12 +464,14 @@ static int rxkad_verify_packet_2(struct rxrpc_call *call, struct sk_buff *skb,
check ^= seq ^ call->call_id;
check &= 0xffff;
if (check != 0) {
rxrpc_abort_call("V2C", call, seq, RXKADSEALEDINCON, -EPROTO);
aborted = rxrpc_abort_eproto(call, skb, "rxkad_2_check", "V2C",
RXKADSEALEDINCON);
goto protocol_error;
}
if (data_size > len) {
rxrpc_abort_call("V2L", call, seq, RXKADDATALEN, -EPROTO);
aborted = rxrpc_abort_eproto(call, skb, "rxkad_2_datalen", "V2L",
RXKADDATALEN);
goto protocol_error;
}
@ -471,8 +479,8 @@ static int rxkad_verify_packet_2(struct rxrpc_call *call, struct sk_buff *skb,
return 0;
protocol_error:
rxrpc_send_abort_packet(call);
_leave(" = -EPROTO");
if (aborted)
rxrpc_send_abort_packet(call);
return -EPROTO;
nomem:
@ -491,6 +499,7 @@ static int rxkad_verify_packet(struct rxrpc_call *call, struct sk_buff *skb,
SKCIPHER_REQUEST_ON_STACK(req, call->conn->cipher);
struct rxrpc_crypt iv;
struct scatterlist sg;
bool aborted;
u16 cksum;
u32 x, y;
@ -522,10 +531,9 @@ static int rxkad_verify_packet(struct rxrpc_call *call, struct sk_buff *skb,
cksum = 1; /* zero checksums are not permitted */
if (cksum != expected_cksum) {
rxrpc_abort_call("VCK", call, seq, RXKADSEALEDINCON, -EPROTO);
rxrpc_send_abort_packet(call);
_leave(" = -EPROTO [csum failed]");
return -EPROTO;
aborted = rxrpc_abort_eproto(call, skb, "rxkad_csum", "VCK",
RXKADSEALEDINCON);
goto protocol_error;
}
switch (call->conn->params.security_level) {
@ -538,6 +546,11 @@ static int rxkad_verify_packet(struct rxrpc_call *call, struct sk_buff *skb,
default:
return -ENOANO;
}
protocol_error:
if (aborted)
rxrpc_send_abort_packet(call);
return -EPROTO;
}
/*
@ -754,11 +767,13 @@ static int rxkad_respond_to_challenge(struct rxrpc_connection *conn,
struct rxkad_response resp
__attribute__((aligned(8))); /* must be aligned for crypto */
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
const char *eproto;
u32 version, nonce, min_level, abort_code;
int ret;
_enter("{%d,%x}", conn->debug_id, key_serial(conn->params.key));
eproto = tracepoint_string("chall_no_key");
abort_code = RX_PROTOCOL_ERROR;
if (!conn->params.key)
goto protocol_error;
@ -768,6 +783,7 @@ static int rxkad_respond_to_challenge(struct rxrpc_connection *conn,
if (ret < 0)
goto other_error;
eproto = tracepoint_string("chall_short");
abort_code = RXKADPACKETSHORT;
if (skb_copy_bits(skb, sizeof(struct rxrpc_wire_header),
&challenge, sizeof(challenge)) < 0)
@ -780,6 +796,7 @@ static int rxkad_respond_to_challenge(struct rxrpc_connection *conn,
_proto("Rx CHALLENGE %%%u { v=%u n=%u ml=%u }",
sp->hdr.serial, version, nonce, min_level);
eproto = tracepoint_string("chall_ver");
abort_code = RXKADINCONSISTENCY;
if (version != RXKAD_VERSION)
goto protocol_error;
@ -814,6 +831,7 @@ static int rxkad_respond_to_challenge(struct rxrpc_connection *conn,
return rxkad_send_response(conn, &sp->hdr, &resp, token->kad);
protocol_error:
trace_rxrpc_rx_eproto(NULL, sp->hdr.serial, eproto);
ret = -EPROTO;
other_error:
*_abort_code = abort_code;
@ -824,19 +842,23 @@ other_error:
* decrypt the kerberos IV ticket in the response
*/
static int rxkad_decrypt_ticket(struct rxrpc_connection *conn,
struct sk_buff *skb,
void *ticket, size_t ticket_len,
struct rxrpc_crypt *_session_key,
time_t *_expiry,
u32 *_abort_code)
{
struct skcipher_request *req;
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
struct rxrpc_crypt iv, key;
struct scatterlist sg[1];
struct in_addr addr;
unsigned int life;
const char *eproto;
time_t issue, now;
bool little_endian;
int ret;
u32 abort_code;
u8 *p, *q, *name, *end;
_enter("{%d},{%x}", conn->debug_id, key_serial(conn->server_key));
@ -847,10 +869,10 @@ static int rxkad_decrypt_ticket(struct rxrpc_connection *conn,
if (ret < 0) {
switch (ret) {
case -EKEYEXPIRED:
*_abort_code = RXKADEXPIRED;
abort_code = RXKADEXPIRED;
goto other_error;
default:
*_abort_code = RXKADNOAUTH;
abort_code = RXKADNOAUTH;
goto other_error;
}
}
@ -875,11 +897,12 @@ static int rxkad_decrypt_ticket(struct rxrpc_connection *conn,
p = ticket;
end = p + ticket_len;
#define Z(size) \
#define Z(field) \
({ \
u8 *__str = p; \
eproto = tracepoint_string("rxkad_bad_"#field); \
q = memchr(p, 0, end - p); \
if (!q || q - p > (size)) \
if (!q || q - p > (field##_SZ)) \
goto bad_ticket; \
for (; p < q; p++) \
if (!isprint(*p)) \
@ -894,17 +917,18 @@ static int rxkad_decrypt_ticket(struct rxrpc_connection *conn,
p++;
/* extract the authentication name */
name = Z(ANAME_SZ);
name = Z(ANAME);
_debug("KIV ANAME: %s", name);
/* extract the principal's instance */
name = Z(INST_SZ);
name = Z(INST);
_debug("KIV INST : %s", name);
/* extract the principal's authentication domain */
name = Z(REALM_SZ);
name = Z(REALM);
_debug("KIV REALM: %s", name);
eproto = tracepoint_string("rxkad_bad_len");
if (end - p < 4 + 8 + 4 + 2)
goto bad_ticket;
@ -939,13 +963,13 @@ static int rxkad_decrypt_ticket(struct rxrpc_connection *conn,
/* check the ticket is in date */
if (issue > now) {
*_abort_code = RXKADNOAUTH;
abort_code = RXKADNOAUTH;
ret = -EKEYREJECTED;
goto other_error;
}
if (issue < now - life) {
*_abort_code = RXKADEXPIRED;
abort_code = RXKADEXPIRED;
ret = -EKEYEXPIRED;
goto other_error;
}
@ -953,18 +977,20 @@ static int rxkad_decrypt_ticket(struct rxrpc_connection *conn,
*_expiry = issue + life;
/* get the service name */
name = Z(SNAME_SZ);
name = Z(SNAME);
_debug("KIV SNAME: %s", name);
/* get the service instance name */
name = Z(INST_SZ);
name = Z(INST);
_debug("KIV SINST: %s", name);
return 0;
bad_ticket:
*_abort_code = RXKADBADTICKET;
trace_rxrpc_rx_eproto(NULL, sp->hdr.serial, eproto);
abort_code = RXKADBADTICKET;
ret = -EPROTO;
other_error:
*_abort_code = abort_code;
return ret;
temporary_error:
return ret;
@ -1017,6 +1043,7 @@ static int rxkad_verify_response(struct rxrpc_connection *conn,
__attribute__((aligned(8))); /* must be aligned for crypto */
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
struct rxrpc_crypt session_key;
const char *eproto;
time_t expiry;
void *ticket;
u32 abort_code, version, kvno, ticket_len, level;
@ -1025,6 +1052,7 @@ static int rxkad_verify_response(struct rxrpc_connection *conn,
_enter("{%d,%x}", conn->debug_id, key_serial(conn->server_key));
eproto = tracepoint_string("rxkad_rsp_short");
abort_code = RXKADPACKETSHORT;
if (skb_copy_bits(skb, sizeof(struct rxrpc_wire_header),
&response, sizeof(response)) < 0)
@ -1038,14 +1066,17 @@ static int rxkad_verify_response(struct rxrpc_connection *conn,
_proto("Rx RESPONSE %%%u { v=%u kv=%u tl=%u }",
sp->hdr.serial, version, kvno, ticket_len);
eproto = tracepoint_string("rxkad_rsp_ver");
abort_code = RXKADINCONSISTENCY;
if (version != RXKAD_VERSION)
goto protocol_error;
eproto = tracepoint_string("rxkad_rsp_tktlen");
abort_code = RXKADTICKETLEN;
if (ticket_len < 4 || ticket_len > MAXKRB5TICKETLEN)
goto protocol_error;
eproto = tracepoint_string("rxkad_rsp_unkkey");
abort_code = RXKADUNKNOWNKEY;
if (kvno >= RXKAD_TKT_TYPE_KERBEROS_V5)
goto protocol_error;
@ -1056,12 +1087,13 @@ static int rxkad_verify_response(struct rxrpc_connection *conn,
if (!ticket)
goto temporary_error;
eproto = tracepoint_string("rxkad_tkt_short");
abort_code = RXKADPACKETSHORT;
if (skb_copy_bits(skb, sizeof(struct rxrpc_wire_header),
ticket, ticket_len) < 0)
goto protocol_error_free;
ret = rxkad_decrypt_ticket(conn, ticket, ticket_len, &session_key,
ret = rxkad_decrypt_ticket(conn, skb, ticket, ticket_len, &session_key,
&expiry, _abort_code);
if (ret < 0)
goto temporary_error_free;
@ -1070,6 +1102,7 @@ static int rxkad_verify_response(struct rxrpc_connection *conn,
* response */
rxkad_decrypt_response(conn, &response, &session_key);
eproto = tracepoint_string("rxkad_rsp_param");
abort_code = RXKADSEALEDINCON;
if (ntohl(response.encrypted.epoch) != conn->proto.epoch)
goto protocol_error_free;
@ -1080,6 +1113,7 @@ static int rxkad_verify_response(struct rxrpc_connection *conn,
csum = response.encrypted.checksum;
response.encrypted.checksum = 0;
rxkad_calc_response_checksum(&response);
eproto = tracepoint_string("rxkad_rsp_csum");
if (response.encrypted.checksum != csum)
goto protocol_error_free;
@ -1088,11 +1122,15 @@ static int rxkad_verify_response(struct rxrpc_connection *conn,
struct rxrpc_call *call;
u32 call_id = ntohl(response.encrypted.call_id[i]);
eproto = tracepoint_string("rxkad_rsp_callid");
if (call_id > INT_MAX)
goto protocol_error_unlock;
eproto = tracepoint_string("rxkad_rsp_callctr");
if (call_id < conn->channels[i].call_counter)
goto protocol_error_unlock;
eproto = tracepoint_string("rxkad_rsp_callst");
if (call_id > conn->channels[i].call_counter) {
call = rcu_dereference_protected(
conn->channels[i].call,
@ -1104,10 +1142,12 @@ static int rxkad_verify_response(struct rxrpc_connection *conn,
}
spin_unlock(&conn->channel_lock);
eproto = tracepoint_string("rxkad_rsp_seq");
abort_code = RXKADOUTOFSEQUENCE;
if (ntohl(response.encrypted.inc_nonce) != conn->security_nonce + 1)
goto protocol_error_free;
eproto = tracepoint_string("rxkad_rsp_level");
abort_code = RXKADLEVELFAIL;
level = ntohl(response.encrypted.level);
if (level > RXRPC_SECURITY_ENCRYPT)
@ -1130,8 +1170,8 @@ protocol_error_unlock:
protocol_error_free:
kfree(ticket);
protocol_error:
trace_rxrpc_rx_eproto(NULL, sp->hdr.serial, eproto);
*_abort_code = abort_code;
_leave(" = -EPROTO [%d]", abort_code);
return -EPROTO;
temporary_error_free:

3
net/rxrpc/sendmsg.c
View File

@ -623,7 +623,8 @@ int rxrpc_kernel_send_data(struct socket *sock, struct rxrpc_call *call,
read_unlock_bh(&call->state_lock);
break;
default:
/* Request phase complete for this client call */
/* Request phase complete for this client call */
trace_rxrpc_rx_eproto(call, 0, tracepoint_string("late_send"));
ret = -EPROTO;
break;
}