Allow authentication data to be stored in an asymmetric key in the 4th element of the key payload and provide a way for it to be destroyed.
For the public key subtype, this will be a public_key_signature struct. Signed-off-by: David Howells <[email protected]> --- crypto/asymmetric_keys/asymmetric_type.c | 7 +++++-- crypto/asymmetric_keys/public_key.c | 20 ++++++++++++++------ crypto/asymmetric_keys/signature.c | 14 ++++++++++++++ crypto/asymmetric_keys/x509_cert_parser.c | 2 +- include/crypto/public_key.h | 5 ++++- include/keys/asymmetric-subtype.h | 2 +- include/keys/asymmetric-type.h | 7 ++++--- 7 files changed, 43 insertions(+), 14 deletions(-) diff --git a/crypto/asymmetric_keys/asymmetric_type.c b/crypto/asymmetric_keys/asymmetric_type.c index 9f2165b27d52..a79d30128821 100644 --- a/crypto/asymmetric_keys/asymmetric_type.c +++ b/crypto/asymmetric_keys/asymmetric_type.c @@ -331,7 +331,8 @@ static void asymmetric_key_free_preparse(struct key_preparsed_payload *prep) pr_devel("==>%s()\n", __func__); if (subtype) { - subtype->destroy(prep->payload.data[asym_crypto]); + subtype->destroy(prep->payload.data[asym_crypto], + prep->payload.data[asym_auth]); module_put(subtype->owner); } asymmetric_key_free_kids(kids); @@ -346,13 +347,15 @@ static void asymmetric_key_destroy(struct key *key) struct asymmetric_key_subtype *subtype = asymmetric_key_subtype(key); struct asymmetric_key_ids *kids = key->payload.data[asym_key_ids]; void *data = key->payload.data[asym_crypto]; + void *auth = key->payload.data[asym_auth]; key->payload.data[asym_crypto] = NULL; key->payload.data[asym_subtype] = NULL; key->payload.data[asym_key_ids] = NULL; + key->payload.data[asym_auth] = NULL; if (subtype) { - subtype->destroy(data); + subtype->destroy(data, auth); module_put(subtype->owner); } diff --git a/crypto/asymmetric_keys/public_key.c b/crypto/asymmetric_keys/public_key.c index 0f8b264b3961..fd76b5fc3b3a 100644 --- a/crypto/asymmetric_keys/public_key.c +++ b/crypto/asymmetric_keys/public_key.c @@ -39,15 +39,23 @@ static void public_key_describe(const struct key *asymmetric_key, /* * Destroy a public key algorithm key. */ -void public_key_destroy(void *payload) +void public_key_free(struct public_key *key) { - struct public_key *key = payload; - - if (key) + if (key) { kfree(key->key); - kfree(key); + kfree(key); + } +} +EXPORT_SYMBOL_GPL(public_key_free); + +/* + * Destroy a public key algorithm key. + */ +static void public_key_destroy(void *payload0, void *payload3) +{ + public_key_free(payload0); + public_key_signature_free(payload3); } -EXPORT_SYMBOL_GPL(public_key_destroy); struct public_key_completion { struct completion completion; diff --git a/crypto/asymmetric_keys/signature.c b/crypto/asymmetric_keys/signature.c index 004d5fc8e56b..3beee3976ed5 100644 --- a/crypto/asymmetric_keys/signature.c +++ b/crypto/asymmetric_keys/signature.c @@ -15,9 +15,23 @@ #include <keys/asymmetric-subtype.h> #include <linux/export.h> #include <linux/err.h> +#include <linux/slab.h> #include <crypto/public_key.h> #include "asymmetric_keys.h" +/* + * Destroy a public key signature. + */ +void public_key_signature_free(struct public_key_signature *sig) +{ + if (sig) { + kfree(sig->s); + kfree(sig->digest); + kfree(sig); + } +} +EXPORT_SYMBOL_GPL(public_key_signature_free); + /** * verify_signature - Initiate the use of an asymmetric key to verify a signature * @key: The asymmetric key to verify against diff --git a/crypto/asymmetric_keys/x509_cert_parser.c b/crypto/asymmetric_keys/x509_cert_parser.c index 4a29bac70060..05251c7f9a03 100644 --- a/crypto/asymmetric_keys/x509_cert_parser.c +++ b/crypto/asymmetric_keys/x509_cert_parser.c @@ -47,7 +47,7 @@ struct x509_parse_context { void x509_free_certificate(struct x509_certificate *cert) { if (cert) { - public_key_destroy(cert->pub); + public_key_free(cert->pub); kfree(cert->issuer); kfree(cert->subject); kfree(cert->id); diff --git a/include/crypto/public_key.h b/include/crypto/public_key.h index aa730ea7faf8..19f557ca50ba 100644 --- a/include/crypto/public_key.h +++ b/include/crypto/public_key.h @@ -41,7 +41,7 @@ struct public_key { const char *pkey_algo; }; -extern void public_key_destroy(void *payload); +extern void public_key_free(struct public_key *key); /* * Public key cryptography signature data @@ -55,7 +55,10 @@ struct public_key_signature { const char *hash_algo; }; +extern void public_key_signature_free(struct public_key_signature *sig); + extern struct asymmetric_key_subtype public_key_subtype; + struct key; extern int verify_signature(const struct key *key, const struct public_key_signature *sig); diff --git a/include/keys/asymmetric-subtype.h b/include/keys/asymmetric-subtype.h index 4915d40d3c3c..2480469ce8fb 100644 --- a/include/keys/asymmetric-subtype.h +++ b/include/keys/asymmetric-subtype.h @@ -32,7 +32,7 @@ struct asymmetric_key_subtype { void (*describe)(const struct key *key, struct seq_file *m); /* Destroy a key of this subtype */ - void (*destroy)(void *payload); + void (*destroy)(void *payload_crypto, void *payload_auth); /* Verify the signature on a key of this subtype (optional) */ int (*verify_signature)(const struct key *key, diff --git a/include/keys/asymmetric-type.h b/include/keys/asymmetric-type.h index 59c1df9cf922..70a8775bb444 100644 --- a/include/keys/asymmetric-type.h +++ b/include/keys/asymmetric-type.h @@ -23,9 +23,10 @@ extern struct key_type key_type_asymmetric; * follows: */ enum asymmetric_payload_bits { - asym_crypto, - asym_subtype, - asym_key_ids, + asym_crypto, /* The data representing the key */ + asym_subtype, /* Pointer to an asymmetric_key_subtype struct */ + asym_key_ids, /* Pointer to an asymmetric_key_ids struct */ + asym_auth /* The key's authorisation (signature, parent key ID) */ }; /*
