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KEYS: RxRPC: Use key preparsing 

Make use of key preparsing in the RxRPC protocol so that quota size
determination can take place prior to keyring locking when a key is being
added.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Steve Dickson <steved@redhat.com>
This commit is contained in:
David Howells 2014-07-18 18:56:36 +01:00
parent d46d494214
commit 8a7a3eb4dd
1 changed files with 105 additions and 76 deletions
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181
net/rxrpc/ar-key.c
View File

@ -26,8 +26,10 @@
#include "ar-internal.h" #include "ar-internal.h"
static int rxrpc_vet_description_s(const char *); static int rxrpc_vet_description_s(const char *);
static int rxrpc_instantiate(struct key *, struct key_preparsed_payload *); static int rxrpc_preparse(struct key_preparsed_payload *);
static int rxrpc_instantiate_s(struct key *, struct key_preparsed_payload *); static int rxrpc_preparse_s(struct key_preparsed_payload *);
static void rxrpc_free_preparse(struct key_preparsed_payload *);
static void rxrpc_free_preparse_s(struct key_preparsed_payload *);
static void rxrpc_destroy(struct key *); static void rxrpc_destroy(struct key *);
static void rxrpc_destroy_s(struct key *); static void rxrpc_destroy_s(struct key *);
static void rxrpc_describe(const struct key *, struct seq_file *); static void rxrpc_describe(const struct key *, struct seq_file *);
@ -39,7 +41,9 @@ static long rxrpc_read(const struct key *, char __user *, size_t);
*/ */
struct key_type key_type_rxrpc = { struct key_type key_type_rxrpc = {
.name = "rxrpc", .name = "rxrpc",
.instantiate = rxrpc_instantiate, .preparse = rxrpc_preparse,
.free_preparse = rxrpc_free_preparse,
.instantiate = generic_key_instantiate,
.match = user_match, .match = user_match,
.destroy = rxrpc_destroy, .destroy = rxrpc_destroy,
.describe = rxrpc_describe, .describe = rxrpc_describe,
@ -54,7 +58,9 @@ EXPORT_SYMBOL(key_type_rxrpc);
struct key_type key_type_rxrpc_s = { struct key_type key_type_rxrpc_s = {
.name = "rxrpc_s", .name = "rxrpc_s",
.vet_description = rxrpc_vet_description_s, .vet_description = rxrpc_vet_description_s,
.instantiate = rxrpc_instantiate_s, .preparse = rxrpc_preparse_s,
.free_preparse = rxrpc_free_preparse_s,
.instantiate = generic_key_instantiate,
.match = user_match, .match = user_match,
.destroy = rxrpc_destroy_s, .destroy = rxrpc_destroy_s,
.describe = rxrpc_describe, .describe = rxrpc_describe,
@ -81,13 +87,13 @@ static int rxrpc_vet_description_s(const char *desc)
* parse an RxKAD type XDR format token * parse an RxKAD type XDR format token
* - the caller guarantees we have at least 4 words * - the caller guarantees we have at least 4 words
*/ */
static int rxrpc_instantiate_xdr_rxkad(struct key *key, const __be32 *xdr, static int rxrpc_preparse_xdr_rxkad(struct key_preparsed_payload *prep,
unsigned int toklen) size_t datalen,
const __be32 *xdr, unsigned int toklen)
{ {
struct rxrpc_key_token *token, **pptoken; struct rxrpc_key_token *token, **pptoken;
size_t plen; size_t plen;
u32 tktlen; u32 tktlen;
int ret;
_enter(",{%x,%x,%x,%x},%u", _enter(",{%x,%x,%x,%x},%u",
ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), ntohl(xdr[3]), ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), ntohl(xdr[3]),
@ -103,9 +109,7 @@ static int rxrpc_instantiate_xdr_rxkad(struct key *key, const __be32 *xdr,
return -EKEYREJECTED; return -EKEYREJECTED;
plen = sizeof(*token) + sizeof(*token->kad) + tktlen; plen = sizeof(*token) + sizeof(*token->kad) + tktlen;
ret = key_payload_reserve(key, key->datalen + plen); prep->quotalen = datalen + plen;
if (ret < 0)
return ret;
plen -= sizeof(*token); plen -= sizeof(*token);
token = kzalloc(sizeof(*token), GFP_KERNEL); token = kzalloc(sizeof(*token), GFP_KERNEL);
@ -146,16 +150,16 @@ static int rxrpc_instantiate_xdr_rxkad(struct key *key, const __be32 *xdr,
token->kad->ticket[6], token->kad->ticket[7]); token->kad->ticket[6], token->kad->ticket[7]);
/* count the number of tokens attached */ /* count the number of tokens attached */
key->type_data.x[0]++; prep->type_data[0] = (void *)((unsigned long)prep->type_data[0] + 1);
/* attach the data */ /* attach the data */
for (pptoken = (struct rxrpc_key_token **)&key->payload.data; for (pptoken = (struct rxrpc_key_token **)&prep->payload[0];
*pptoken; *pptoken;
pptoken = &(*pptoken)->next) pptoken = &(*pptoken)->next)
continue; continue;
*pptoken = token; *pptoken = token;
if (token->kad->expiry < key->expiry) if (token->kad->expiry < prep->expiry)
key->expiry = token->kad->expiry; prep->expiry = token->kad->expiry;
_leave(" = 0"); _leave(" = 0");
return 0; return 0;
@ -418,8 +422,9 @@ static int rxrpc_krb5_decode_ticket(u8 **_ticket, u16 *_tktlen,
* parse an RxK5 type XDR format token * parse an RxK5 type XDR format token
* - the caller guarantees we have at least 4 words * - the caller guarantees we have at least 4 words
*/ */
static int rxrpc_instantiate_xdr_rxk5(struct key *key, const __be32 *xdr, static int rxrpc_preparse_xdr_rxk5(struct key_preparsed_payload *prep,
unsigned int toklen) size_t datalen,
const __be32 *xdr, unsigned int toklen)
{ {
struct rxrpc_key_token *token, **pptoken; struct rxrpc_key_token *token, **pptoken;
struct rxk5_key *rxk5; struct rxk5_key *rxk5;
@ -432,9 +437,7 @@ static int rxrpc_instantiate_xdr_rxk5(struct key *key, const __be32 *xdr,
/* reserve some payload space for this subkey - the length of the token /* reserve some payload space for this subkey - the length of the token
* is a reasonable approximation */ * is a reasonable approximation */
ret = key_payload_reserve(key, key->datalen + toklen); prep->quotalen = datalen + toklen;
if (ret < 0)
return ret;
token = kzalloc(sizeof(*token), GFP_KERNEL); token = kzalloc(sizeof(*token), GFP_KERNEL);
if (!token) if (!token)
@ -520,14 +523,14 @@ static int rxrpc_instantiate_xdr_rxk5(struct key *key, const __be32 *xdr,
if (toklen != 0) if (toklen != 0)
goto inval; goto inval;
/* attach the payload to the key */ /* attach the payload */
for (pptoken = (struct rxrpc_key_token **)&key->payload.data; for (pptoken = (struct rxrpc_key_token **)&prep->payload[0];
*pptoken; *pptoken;
pptoken = &(*pptoken)->next) pptoken = &(*pptoken)->next)
continue; continue;
*pptoken = token; *pptoken = token;
if (token->kad->expiry < key->expiry) if (token->kad->expiry < prep->expiry)
key->expiry = token->kad->expiry; prep->expiry = token->kad->expiry;
_leave(" = 0"); _leave(" = 0");
return 0; return 0;
@ -545,16 +548,17 @@ error:
* attempt to parse the data as the XDR format * attempt to parse the data as the XDR format
* - the caller guarantees we have more than 7 words * - the caller guarantees we have more than 7 words
*/ */
static int rxrpc_instantiate_xdr(struct key *key, const void *data, size_t datalen) static int rxrpc_preparse_xdr(struct key_preparsed_payload *prep)
{ {
const __be32 *xdr = data, *token; const __be32 *xdr = prep->data, *token;
const char *cp; const char *cp;
unsigned int len, tmp, loop, ntoken, toklen, sec_ix; unsigned int len, tmp, loop, ntoken, toklen, sec_ix;
size_t datalen = prep->datalen;
int ret; int ret;
_enter(",{%x,%x,%x,%x},%zu", _enter(",{%x,%x,%x,%x},%zu",
ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), ntohl(xdr[3]), ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), ntohl(xdr[3]),
datalen); prep->datalen);
if (datalen > AFSTOKEN_LENGTH_MAX) if (datalen > AFSTOKEN_LENGTH_MAX)
goto not_xdr; goto not_xdr;
@ -635,13 +639,13 @@ static int rxrpc_instantiate_xdr(struct key *key, const void *data, size_t datal
switch (sec_ix) { switch (sec_ix) {
case RXRPC_SECURITY_RXKAD: case RXRPC_SECURITY_RXKAD:
ret = rxrpc_instantiate_xdr_rxkad(key, xdr, toklen); ret = rxrpc_preparse_xdr_rxkad(prep, datalen, xdr, toklen);
if (ret != 0) if (ret != 0)
goto error; goto error;
break; break;
case RXRPC_SECURITY_RXK5: case RXRPC_SECURITY_RXK5:
ret = rxrpc_instantiate_xdr_rxk5(key, xdr, toklen); ret = rxrpc_preparse_xdr_rxk5(prep, datalen, xdr, toklen);
if (ret != 0) if (ret != 0)
goto error; goto error;
break; break;
@ -665,8 +669,9 @@ error:
} }
/* /*
* instantiate an rxrpc defined key * Preparse an rxrpc defined key.
* data should be of the form: *
* Data should be of the form:
* OFFSET LEN CONTENT * OFFSET LEN CONTENT
* 0 4 key interface version number * 0 4 key interface version number
* 4 2 security index (type) * 4 2 security index (type)
@ -678,7 +683,7 @@ error:
* *
* if no data is provided, then a no-security key is made * if no data is provided, then a no-security key is made
*/ */
static int rxrpc_instantiate(struct key *key, struct key_preparsed_payload *prep) static int rxrpc_preparse(struct key_preparsed_payload *prep)
{ {
const struct rxrpc_key_data_v1 *v1; const struct rxrpc_key_data_v1 *v1;
struct rxrpc_key_token *token, **pp; struct rxrpc_key_token *token, **pp;
@ -686,7 +691,7 @@ static int rxrpc_instantiate(struct key *key, struct key_preparsed_payload *prep
u32 kver; u32 kver;
int ret; int ret;
_enter("{%x},,%zu", key_serial(key), prep->datalen); _enter("%zu", prep->datalen);
/* handle a no-security key */ /* handle a no-security key */
if (!prep->data && prep->datalen == 0) if (!prep->data && prep->datalen == 0)
@ -694,7 +699,7 @@ static int rxrpc_instantiate(struct key *key, struct key_preparsed_payload *prep
/* determine if the XDR payload format is being used */ /* determine if the XDR payload format is being used */
if (prep->datalen > 7 * 4) { if (prep->datalen > 7 * 4) {
ret = rxrpc_instantiate_xdr(key, prep->data, prep->datalen); ret = rxrpc_preparse_xdr(prep);
if (ret != -EPROTO) if (ret != -EPROTO)
return ret; return ret;
} }
@ -743,9 +748,7 @@ static int rxrpc_instantiate(struct key *key, struct key_preparsed_payload *prep
goto error; goto error;
plen = sizeof(*token->kad) + v1->ticket_length; plen = sizeof(*token->kad) + v1->ticket_length;
ret = key_payload_reserve(key, plen + sizeof(*token)); prep->quotalen = plen + sizeof(*token);
if (ret < 0)
goto error;
ret = -ENOMEM; ret = -ENOMEM;
token = kzalloc(sizeof(*token), GFP_KERNEL); token = kzalloc(sizeof(*token), GFP_KERNEL);
@ -762,15 +765,16 @@ static int rxrpc_instantiate(struct key *key, struct key_preparsed_payload *prep
memcpy(&token->kad->session_key, &v1->session_key, 8); memcpy(&token->kad->session_key, &v1->session_key, 8);
memcpy(&token->kad->ticket, v1->ticket, v1->ticket_length); memcpy(&token->kad->ticket, v1->ticket, v1->ticket_length);
/* attach the data */ /* count the number of tokens attached */
key->type_data.x[0]++; prep->type_data[0] = (void *)((unsigned long)prep->type_data[0] + 1);
pp = (struct rxrpc_key_token **)&key->payload.data; /* attach the data */
pp = (struct rxrpc_key_token **)&prep->payload[0];
while (*pp) while (*pp)
pp = &(*pp)->next; pp = &(*pp)->next;
*pp = token; *pp = token;
if (token->kad->expiry < key->expiry) if (token->kad->expiry < prep->expiry)
key->expiry = token->kad->expiry; prep->expiry = token->kad->expiry;
token = NULL; token = NULL;
ret = 0; ret = 0;
@ -781,44 +785,14 @@ error:
} }
/* /*
* instantiate a server secret key * Free token list.
* data should be a pointer to the 8-byte secret key
*/ */
static int rxrpc_instantiate_s(struct key *key, static void rxrpc_free_token_list(struct rxrpc_key_token *token)
struct key_preparsed_payload *prep)
{ {
struct crypto_blkcipher *ci; struct rxrpc_key_token *next;
_enter("{%x},,%zu", key_serial(key), prep->datalen); for (; token; token = next) {
next = token->next;
if (prep->datalen != 8)
return -EINVAL;
memcpy(&key->type_data, prep->data, 8);
ci = crypto_alloc_blkcipher("pcbc(des)", 0, CRYPTO_ALG_ASYNC);
if (IS_ERR(ci)) {
_leave(" = %ld", PTR_ERR(ci));
return PTR_ERR(ci);
}
if (crypto_blkcipher_setkey(ci, prep->data, 8) < 0)
BUG();
key->payload.data = ci;
_leave(" = 0");
return 0;
}
/*
* dispose of the data dangling from the corpse of a rxrpc key
*/
static void rxrpc_destroy(struct key *key)
{
struct rxrpc_key_token *token;
while ((token = key->payload.data)) {
key->payload.data = token->next;
switch (token->security_index) { switch (token->security_index) {
case RXRPC_SECURITY_RXKAD: case RXRPC_SECURITY_RXKAD:
kfree(token->kad); kfree(token->kad);
@ -837,6 +811,61 @@ static void rxrpc_destroy(struct key *key)
} }
} }
/*
* Clean up preparse data.
*/
static void rxrpc_free_preparse(struct key_preparsed_payload *prep)
{
rxrpc_free_token_list(prep->payload[0]);
}
/*
* Preparse a server secret key.
*
* The data should be the 8-byte secret key.
*/
static int rxrpc_preparse_s(struct key_preparsed_payload *prep)
{
struct crypto_blkcipher *ci;
_enter("%zu", prep->datalen);
if (prep->datalen != 8)
return -EINVAL;
memcpy(&prep->type_data, prep->data, 8);
ci = crypto_alloc_blkcipher("pcbc(des)", 0, CRYPTO_ALG_ASYNC);
if (IS_ERR(ci)) {
_leave(" = %ld", PTR_ERR(ci));
return PTR_ERR(ci);
}
if (crypto_blkcipher_setkey(ci, prep->data, 8) < 0)
BUG();
prep->payload[0] = ci;
_leave(" = 0");
return 0;
}
/*
* Clean up preparse data.
*/
static void rxrpc_free_preparse_s(struct key_preparsed_payload *prep)
{
if (prep->payload[0])
crypto_free_blkcipher(prep->payload[0]);
}
/*
* dispose of the data dangling from the corpse of a rxrpc key
*/
static void rxrpc_destroy(struct key *key)
{
rxrpc_free_token_list(key->payload.data);
}
/* /*
* dispose of the data dangling from the corpse of a rxrpc key * dispose of the data dangling from the corpse of a rxrpc key
*/ */