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KEYS: make partial key id matching as a dedicated function

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To avoid code duplication this patch refactors asymmetric_key_match(),
making partial ID string match a separate function.

This patch also implicitly fixes a bug in the code.  asymmetric_key_match()
allows to match the key by its subtype. But subtype matching could be
undone if asymmetric_key_id(key) would return NULL. This patch first
checks for matching spec and then for its value.

Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
This commit is contained in:
Dmitry Kasatkin 2014-06-17 11:56:57 +03:00 committed by Mimi Zohar
parent 3be4beaf7c
commit b3426827c8
2 changed files with 33 additions and 19 deletions
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2
crypto/asymmetric_keys/asymmetric_keys.h
View file

@ -9,6 +9,8 @@
* 2 of the Licence, or (at your option) any later version.
*/
int asymmetric_keyid_match(const char *kid, const char *id);
static inline const char *asymmetric_key_id(const struct key *key)
{
return key->type_data.p[1];

50
crypto/asymmetric_keys/asymmetric_type.c
View file

@ -22,6 +22,34 @@ MODULE_LICENSE("GPL");
static LIST_HEAD(asymmetric_key_parsers);
static DECLARE_RWSEM(asymmetric_key_parsers_sem);
/*
* Match asymmetric key id with partial match
* @id: key id to match in a form "id:<id>"
*/
int asymmetric_keyid_match(const char *kid, const char *id)
{
size_t idlen, kidlen;
if (!kid || !id)
return 0;
/* make it possible to use id as in the request: "id:<id>" */
if (strncmp(id, "id:", 3) == 0)
id += 3;
/* Anything after here requires a partial match on the ID string */
idlen = strlen(id);
kidlen = strlen(kid);
if (idlen > kidlen)
return 0;
kid += kidlen - idlen;
if (strcasecmp(id, kid) != 0)
return 0;
return 1;
}
/*
* Match asymmetric keys on (part of) their name
* We have some shorthand methods for matching keys. We allow:
@ -34,9 +62,8 @@ static int asymmetric_key_match(const struct key *key, const void *description)
{
const struct asymmetric_key_subtype *subtype = asymmetric_key_subtype(key);
const char *spec = description;
const char *id, *kid;
const char *id;
ptrdiff_t speclen;
size_t idlen, kidlen;
if (!subtype || !spec || !*spec)
return 0;
@ -55,23 +82,8 @@ static int asymmetric_key_match(const struct key *key, const void *description)
speclen = id - spec;
id++;
/* Anything after here requires a partial match on the ID string */
kid = asymmetric_key_id(key);
if (!kid)
return 0;
idlen = strlen(id);
kidlen = strlen(kid);
if (idlen > kidlen)
return 0;
kid += kidlen - idlen;
if (strcasecmp(id, kid) != 0)
return 0;
if (speclen == 2 &&
memcmp(spec, "id", 2) == 0)
return 1;
if (speclen == 2 && memcmp(spec, "id", 2) == 0)
return asymmetric_keyid_match(asymmetric_key_id(key), id);
if (speclen == subtype->name_len &&
memcmp(spec, subtype->name, speclen) == 0)