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-rw-r--r--crypto/asymmetric_keys/Kconfig6
-rw-r--r--crypto/asymmetric_keys/Makefile5
-rw-r--r--crypto/asymmetric_keys/asymmetric_keys.h2
-rw-r--r--crypto/asymmetric_keys/asymmetric_type.c96
-rw-r--r--crypto/asymmetric_keys/mscode_parser.c22
-rw-r--r--crypto/asymmetric_keys/pkcs7_key_type.c72
-rw-r--r--crypto/asymmetric_keys/pkcs7_parser.c58
-rw-r--r--crypto/asymmetric_keys/pkcs7_parser.h11
-rw-r--r--crypto/asymmetric_keys/pkcs7_trust.c43
-rw-r--r--crypto/asymmetric_keys/pkcs7_verify.c109
-rw-r--r--crypto/asymmetric_keys/public_key.c20
-rw-r--r--crypto/asymmetric_keys/restrict.c108
-rw-r--r--crypto/asymmetric_keys/signature.c18
-rw-r--r--crypto/asymmetric_keys/verify_pefile.c40
-rw-r--r--crypto/asymmetric_keys/verify_pefile.h5
-rw-r--r--crypto/asymmetric_keys/x509_cert_parser.c52
-rw-r--r--crypto/asymmetric_keys/x509_parser.h12
-rw-r--r--crypto/asymmetric_keys/x509_public_key.c297
18 files changed, 508 insertions, 468 deletions
diff --git a/crypto/asymmetric_keys/Kconfig b/crypto/asymmetric_keys/Kconfig
index 477cbf39e..331f6baf2 100644
--- a/crypto/asymmetric_keys/Kconfig
+++ b/crypto/asymmetric_keys/Kconfig
@@ -1,5 +1,5 @@
menuconfig ASYMMETRIC_KEY_TYPE
- tristate "Asymmetric (public-key cryptographic) key type"
+ bool "Asymmetric (public-key cryptographic) key type"
depends on KEYS
help
This option provides support for a key type that holds the data for
@@ -41,8 +41,7 @@ config PKCS7_MESSAGE_PARSER
config PKCS7_TEST_KEY
tristate "PKCS#7 testing key type"
- depends on PKCS7_MESSAGE_PARSER
- select SYSTEM_TRUSTED_KEYRING
+ depends on SYSTEM_DATA_VERIFICATION
help
This option provides a type of key that can be loaded up from a
PKCS#7 message - provided the message is signed by a trusted key. If
@@ -55,6 +54,7 @@ config PKCS7_TEST_KEY
config SIGNED_PE_FILE_VERIFICATION
bool "Support for PE file signature verification"
depends on PKCS7_MESSAGE_PARSER=y
+ depends on SYSTEM_DATA_VERIFICATION
select ASN1
select OID_REGISTRY
help
diff --git a/crypto/asymmetric_keys/Makefile b/crypto/asymmetric_keys/Makefile
index f90486256..6516855be 100644
--- a/crypto/asymmetric_keys/Makefile
+++ b/crypto/asymmetric_keys/Makefile
@@ -4,7 +4,10 @@
obj-$(CONFIG_ASYMMETRIC_KEY_TYPE) += asymmetric_keys.o
-asymmetric_keys-y := asymmetric_type.o signature.o
+asymmetric_keys-y := \
+ asymmetric_type.o \
+ restrict.o \
+ signature.o
obj-$(CONFIG_ASYMMETRIC_PUBLIC_KEY_SUBTYPE) += public_key.o
diff --git a/crypto/asymmetric_keys/asymmetric_keys.h b/crypto/asymmetric_keys/asymmetric_keys.h
index 1d450b580..ca8e9ac34 100644
--- a/crypto/asymmetric_keys/asymmetric_keys.h
+++ b/crypto/asymmetric_keys/asymmetric_keys.h
@@ -9,6 +9,8 @@
* 2 of the Licence, or (at your option) any later version.
*/
+#include <keys/asymmetric-type.h>
+
extern struct asymmetric_key_id *asymmetric_key_hex_to_key_id(const char *id);
extern int __asymmetric_key_hex_to_key_id(const char *id,
diff --git a/crypto/asymmetric_keys/asymmetric_type.c b/crypto/asymmetric_keys/asymmetric_type.c
index 9f2165b27..6600181d5 100644
--- a/crypto/asymmetric_keys/asymmetric_type.c
+++ b/crypto/asymmetric_keys/asymmetric_type.c
@@ -35,6 +35,95 @@ static LIST_HEAD(asymmetric_key_parsers);
static DECLARE_RWSEM(asymmetric_key_parsers_sem);
/**
+ * find_asymmetric_key - Find a key by ID.
+ * @keyring: The keys to search.
+ * @id_0: The first ID to look for or NULL.
+ * @id_1: The second ID to look for or NULL.
+ * @partial: Use partial match if true, exact if false.
+ *
+ * Find a key in the given keyring by identifier. The preferred identifier is
+ * the id_0 and the fallback identifier is the id_1. If both are given, the
+ * lookup is by the former, but the latter must also match.
+ */
+struct key *find_asymmetric_key(struct key *keyring,
+ const struct asymmetric_key_id *id_0,
+ const struct asymmetric_key_id *id_1,
+ bool partial)
+{
+ struct key *key;
+ key_ref_t ref;
+ const char *lookup;
+ char *req, *p;
+ int len;
+
+ if (id_0) {
+ lookup = id_0->data;
+ len = id_0->len;
+ } else {
+ lookup = id_1->data;
+ len = id_1->len;
+ }
+
+ /* Construct an identifier "id:<keyid>". */
+ p = req = kmalloc(2 + 1 + len * 2 + 1, GFP_KERNEL);
+ if (!req)
+ return ERR_PTR(-ENOMEM);
+
+ if (partial) {
+ *p++ = 'i';
+ *p++ = 'd';
+ } else {
+ *p++ = 'e';
+ *p++ = 'x';
+ }
+ *p++ = ':';
+ p = bin2hex(p, lookup, len);
+ *p = 0;
+
+ pr_debug("Look up: \"%s\"\n", req);
+
+ ref = keyring_search(make_key_ref(keyring, 1),
+ &key_type_asymmetric, req);
+ if (IS_ERR(ref))
+ pr_debug("Request for key '%s' err %ld\n", req, PTR_ERR(ref));
+ kfree(req);
+
+ if (IS_ERR(ref)) {
+ switch (PTR_ERR(ref)) {
+ /* Hide some search errors */
+ case -EACCES:
+ case -ENOTDIR:
+ case -EAGAIN:
+ return ERR_PTR(-ENOKEY);
+ default:
+ return ERR_CAST(ref);
+ }
+ }
+
+ key = key_ref_to_ptr(ref);
+ if (id_0 && id_1) {
+ const struct asymmetric_key_ids *kids = asymmetric_key_ids(key);
+
+ if (!kids->id[0]) {
+ pr_debug("First ID matches, but second is missing\n");
+ goto reject;
+ }
+ if (!asymmetric_key_id_same(id_1, kids->id[1])) {
+ pr_debug("First ID matches, but second does not\n");
+ goto reject;
+ }
+ }
+
+ pr_devel("<==%s() = 0 [%x]\n", __func__, key_serial(key));
+ return key;
+
+reject:
+ key_put(key);
+ return ERR_PTR(-EKEYREJECTED);
+}
+EXPORT_SYMBOL_GPL(find_asymmetric_key);
+
+/**
* asymmetric_key_generate_id: Construct an asymmetric key ID
* @val_1: First binary blob
* @len_1: Length of first binary blob
@@ -331,7 +420,8 @@ 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 +436,15 @@ 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/mscode_parser.c b/crypto/asymmetric_keys/mscode_parser.c
index 3242cbfae..9492e1c22 100644
--- a/crypto/asymmetric_keys/mscode_parser.c
+++ b/crypto/asymmetric_keys/mscode_parser.c
@@ -21,19 +21,13 @@
/*
* Parse a Microsoft Individual Code Signing blob
*/
-int mscode_parse(struct pefile_context *ctx)
+int mscode_parse(void *_ctx, const void *content_data, size_t data_len,
+ size_t asn1hdrlen)
{
- const void *content_data;
- size_t data_len;
- int ret;
-
- ret = pkcs7_get_content_data(ctx->pkcs7, &content_data, &data_len, 1);
-
- if (ret) {
- pr_debug("PKCS#7 message does not contain data\n");
- return ret;
- }
+ struct pefile_context *ctx = _ctx;
+ content_data -= asn1hdrlen;
+ data_len += asn1hdrlen;
pr_devel("Data: %zu [%*ph]\n", data_len, (unsigned)(data_len),
content_data);
@@ -129,7 +123,11 @@ int mscode_note_digest(void *context, size_t hdrlen,
{
struct pefile_context *ctx = context;
- ctx->digest = value;
+ ctx->digest = kmemdup(value, vlen, GFP_KERNEL);
+ if (!ctx->digest)
+ return -ENOMEM;
+
ctx->digest_len = vlen;
+
return 0;
}
diff --git a/crypto/asymmetric_keys/pkcs7_key_type.c b/crypto/asymmetric_keys/pkcs7_key_type.c
index e2d0edbbc..1063b644e 100644
--- a/crypto/asymmetric_keys/pkcs7_key_type.c
+++ b/crypto/asymmetric_keys/pkcs7_key_type.c
@@ -13,12 +13,9 @@
#include <linux/key.h>
#include <linux/err.h>
#include <linux/module.h>
+#include <linux/verification.h>
#include <linux/key-type.h>
-#include <keys/asymmetric-type.h>
-#include <crypto/pkcs7.h>
#include <keys/user-type.h>
-#include <keys/system_keyring.h>
-#include "pkcs7_parser.h"
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("PKCS#7 testing key type");
@@ -29,60 +26,47 @@ MODULE_PARM_DESC(pkcs7_usage,
"Usage to specify when verifying the PKCS#7 message");
/*
- * Preparse a PKCS#7 wrapped and validated data blob.
+ * Retrieve the PKCS#7 message content.
*/
-static int pkcs7_preparse(struct key_preparsed_payload *prep)
+static int pkcs7_view_content(void *ctx, const void *data, size_t len,
+ size_t asn1hdrlen)
{
- enum key_being_used_for usage = pkcs7_usage;
- struct pkcs7_message *pkcs7;
- const void *data, *saved_prep_data;
- size_t datalen, saved_prep_datalen;
- bool trusted;
+ struct key_preparsed_payload *prep = ctx;
+ const void *saved_prep_data;
+ size_t saved_prep_datalen;
int ret;
- kenter("");
-
- if (usage >= NR__KEY_BEING_USED_FOR) {
- pr_err("Invalid usage type %d\n", usage);
- return -EINVAL;
- }
-
saved_prep_data = prep->data;
saved_prep_datalen = prep->datalen;
- pkcs7 = pkcs7_parse_message(saved_prep_data, saved_prep_datalen);
- if (IS_ERR(pkcs7)) {
- ret = PTR_ERR(pkcs7);
- goto error;
- }
-
- ret = pkcs7_verify(pkcs7, usage);
- if (ret < 0)
- goto error_free;
-
- ret = pkcs7_validate_trust(pkcs7, system_trusted_keyring, &trusted);
- if (ret < 0)
- goto error_free;
- if (!trusted)
- pr_warn("PKCS#7 message doesn't chain back to a trusted key\n");
-
- ret = pkcs7_get_content_data(pkcs7, &data, &datalen, false);
- if (ret < 0)
- goto error_free;
-
prep->data = data;
- prep->datalen = datalen;
+ prep->datalen = len;
+
ret = user_preparse(prep);
+
prep->data = saved_prep_data;
prep->datalen = saved_prep_datalen;
-
-error_free:
- pkcs7_free_message(pkcs7);
-error:
- kleave(" = %d", ret);
return ret;
}
/*
+ * Preparse a PKCS#7 wrapped and validated data blob.
+ */
+static int pkcs7_preparse(struct key_preparsed_payload *prep)
+{
+ enum key_being_used_for usage = pkcs7_usage;
+
+ if (usage >= NR__KEY_BEING_USED_FOR) {
+ pr_err("Invalid usage type %d\n", usage);
+ return -EINVAL;
+ }
+
+ return verify_pkcs7_signature(NULL, 0,
+ prep->data, prep->datalen,
+ (void *)1UL, usage,
+ pkcs7_view_content, prep);
+}
+
+/*
* user defined keys take an arbitrary string as the description and an
* arbitrary blob of data as the payload
*/
diff --git a/crypto/asymmetric_keys/pkcs7_parser.c b/crypto/asymmetric_keys/pkcs7_parser.c
index bdd0d753c..af4cd8649 100644
--- a/crypto/asymmetric_keys/pkcs7_parser.c
+++ b/crypto/asymmetric_keys/pkcs7_parser.c
@@ -44,9 +44,7 @@ struct pkcs7_parse_context {
static void pkcs7_free_signed_info(struct pkcs7_signed_info *sinfo)
{
if (sinfo) {
- kfree(sinfo->sig.s);
- kfree(sinfo->sig.digest);
- kfree(sinfo->signing_cert_id);
+ public_key_signature_free(sinfo->sig);
kfree(sinfo);
}
}
@@ -125,6 +123,10 @@ struct pkcs7_message *pkcs7_parse_message(const void *data, size_t datalen)
ctx->sinfo = kzalloc(sizeof(struct pkcs7_signed_info), GFP_KERNEL);
if (!ctx->sinfo)
goto out_no_sinfo;
+ ctx->sinfo->sig = kzalloc(sizeof(struct public_key_signature),
+ GFP_KERNEL);
+ if (!ctx->sinfo->sig)
+ goto out_no_sig;
ctx->data = (unsigned long)data;
ctx->ppcerts = &ctx->certs;
@@ -150,6 +152,7 @@ out:
ctx->certs = cert->next;
x509_free_certificate(cert);
}
+out_no_sig:
pkcs7_free_signed_info(ctx->sinfo);
out_no_sinfo:
pkcs7_free_message(ctx->msg);
@@ -165,24 +168,25 @@ EXPORT_SYMBOL_GPL(pkcs7_parse_message);
* @pkcs7: The preparsed PKCS#7 message to access
* @_data: Place to return a pointer to the data
* @_data_len: Place to return the data length
- * @want_wrapper: True if the ASN.1 object header should be included in the data
+ * @_headerlen: Size of ASN.1 header not included in _data
*
- * Get access to the data content of the PKCS#7 message, including, optionally,
- * the header of the ASN.1 object that contains it. Returns -ENODATA if the
- * data object was missing from the message.
+ * Get access to the data content of the PKCS#7 message. The size of the
+ * header of the ASN.1 object that contains it is also provided and can be used
+ * to adjust *_data and *_data_len to get the entire object.
+ *
+ * Returns -ENODATA if the data object was missing from the message.
*/
int pkcs7_get_content_data(const struct pkcs7_message *pkcs7,
const void **_data, size_t *_data_len,
- bool want_wrapper)
+ size_t *_headerlen)
{
- size_t wrapper;
-
if (!pkcs7->data)
return -ENODATA;
- wrapper = want_wrapper ? pkcs7->data_hdrlen : 0;
- *_data = pkcs7->data - wrapper;
- *_data_len = pkcs7->data_len + wrapper;
+ *_data = pkcs7->data;
+ *_data_len = pkcs7->data_len;
+ if (_headerlen)
+ *_headerlen = pkcs7->data_hdrlen;
return 0;
}
EXPORT_SYMBOL_GPL(pkcs7_get_content_data);
@@ -218,25 +222,25 @@ int pkcs7_sig_note_digest_algo(void *context, size_t hdrlen,
switch (ctx->last_oid) {
case OID_md4:
- ctx->sinfo->sig.hash_algo = "md4";
+ ctx->sinfo->sig->hash_algo = "md4";
break;
case OID_md5:
- ctx->sinfo->sig.hash_algo = "md5";
+ ctx->sinfo->sig->hash_algo = "md5";
break;
case OID_sha1:
- ctx->sinfo->sig.hash_algo = "sha1";
+ ctx->sinfo->sig->hash_algo = "sha1";
break;
case OID_sha256:
- ctx->sinfo->sig.hash_algo = "sha256";
+ ctx->sinfo->sig->hash_algo = "sha256";
break;
case OID_sha384:
- ctx->sinfo->sig.hash_algo = "sha384";
+ ctx->sinfo->sig->hash_algo = "sha384";
break;
case OID_sha512:
- ctx->sinfo->sig.hash_algo = "sha512";
+ ctx->sinfo->sig->hash_algo = "sha512";
break;
case OID_sha224:
- ctx->sinfo->sig.hash_algo = "sha224";
+ ctx->sinfo->sig->hash_algo = "sha224";
break;
default:
printk("Unsupported digest algo: %u\n", ctx->last_oid);
@@ -256,7 +260,7 @@ int pkcs7_sig_note_pkey_algo(void *context, size_t hdrlen,
switch (ctx->last_oid) {
case OID_rsaEncryption:
- ctx->sinfo->sig.pkey_algo = "rsa";
+ ctx->sinfo->sig->pkey_algo = "rsa";
break;
default:
printk("Unsupported pkey algo: %u\n", ctx->last_oid);
@@ -616,11 +620,11 @@ int pkcs7_sig_note_signature(void *context, size_t hdrlen,
{
struct pkcs7_parse_context *ctx = context;
- ctx->sinfo->sig.s = kmemdup(value, vlen, GFP_KERNEL);
- if (!ctx->sinfo->sig.s)
+ ctx->sinfo->sig->s = kmemdup(value, vlen, GFP_KERNEL);
+ if (!ctx->sinfo->sig->s)
return -ENOMEM;
- ctx->sinfo->sig.s_size = vlen;
+ ctx->sinfo->sig->s_size = vlen;
return 0;
}
@@ -656,12 +660,16 @@ int pkcs7_note_signed_info(void *context, size_t hdrlen,
pr_devel("SINFO KID: %u [%*phN]\n", kid->len, kid->len, kid->data);
- sinfo->signing_cert_id = kid;
+ sinfo->sig->auth_ids[0] = kid;
sinfo->index = ++ctx->sinfo_index;
*ctx->ppsinfo = sinfo;
ctx->ppsinfo = &sinfo->next;
ctx->sinfo = kzalloc(sizeof(struct pkcs7_signed_info), GFP_KERNEL);
if (!ctx->sinfo)
return -ENOMEM;
+ ctx->sinfo->sig = kzalloc(sizeof(struct public_key_signature),
+ GFP_KERNEL);
+ if (!ctx->sinfo->sig)
+ return -ENOMEM;
return 0;
}
diff --git a/crypto/asymmetric_keys/pkcs7_parser.h b/crypto/asymmetric_keys/pkcs7_parser.h
index a66b19ebc..f4e81074f 100644
--- a/crypto/asymmetric_keys/pkcs7_parser.h
+++ b/crypto/asymmetric_keys/pkcs7_parser.h
@@ -22,7 +22,6 @@ struct pkcs7_signed_info {
struct pkcs7_signed_info *next;
struct x509_certificate *signer; /* Signing certificate (in msg->certs) */
unsigned index;
- bool trusted;
bool unsupported_crypto; /* T if not usable due to missing crypto */
/* Message digest - the digest of the Content Data (or NULL) */
@@ -41,19 +40,17 @@ struct pkcs7_signed_info {
#define sinfo_has_ms_statement_type 5
time64_t signing_time;
- /* Issuing cert serial number and issuer's name [PKCS#7 or CMS ver 1]
- * or issuing cert's SKID [CMS ver 3].
- */
- struct asymmetric_key_id *signing_cert_id;
-
/* Message signature.
*
* This contains the generated digest of _either_ the Content Data or
* the Authenticated Attributes [RFC2315 9.3]. If the latter, one of
* the attributes contains the digest of the the Content Data within
* it.
+ *
+ * THis also contains the issuing cert serial number and issuer's name
+ * [PKCS#7 or CMS ver 1] or issuing cert's SKID [CMS ver 3].
*/
- struct public_key_signature sig;
+ struct public_key_signature *sig;
};
struct pkcs7_message {
diff --git a/crypto/asymmetric_keys/pkcs7_trust.c b/crypto/asymmetric_keys/pkcs7_trust.c
index 7d7a39b47..f6a009d88 100644
--- a/crypto/asymmetric_keys/pkcs7_trust.c
+++ b/crypto/asymmetric_keys/pkcs7_trust.c
@@ -27,10 +27,9 @@ static int pkcs7_validate_trust_one(struct pkcs7_message *pkcs7,
struct pkcs7_signed_info *sinfo,
struct key *trust_keyring)
{
- struct public_key_signature *sig = &sinfo->sig;
+ struct public_key_signature *sig = sinfo->sig;
struct x509_certificate *x509, *last = NULL, *p;
struct key *key;
- bool trusted;
int ret;
kenter(",%u,", sinfo->index);
@@ -42,10 +41,8 @@ static int pkcs7_validate_trust_one(struct pkcs7_message *pkcs7,
for (x509 = sinfo->signer; x509; x509 = x509->signer) {
if (x509->seen) {
- if (x509->verified) {
- trusted = x509->trusted;
+ if (x509->verified)
goto verified;
- }
kleave(" = -ENOKEY [cached]");
return -ENOKEY;
}
@@ -54,9 +51,8 @@ static int pkcs7_validate_trust_one(struct pkcs7_message *pkcs7,
/* Look to see if this certificate is present in the trusted
* keys.
*/
- key = x509_request_asymmetric_key(trust_keyring,
- x509->id, x509->skid,
- false);
+ key = find_asymmetric_key(trust_keyring,
+ x509->id, x509->skid, false);
if (!IS_ERR(key)) {
/* One of the X.509 certificates in the PKCS#7 message
* is apparently the same as one we already trust.
@@ -80,17 +76,17 @@ static int pkcs7_validate_trust_one(struct pkcs7_message *pkcs7,
might_sleep();
last = x509;
- sig = &last->sig;
+ sig = last->sig;
}
/* No match - see if the root certificate has a signer amongst the
* trusted keys.
*/
- if (last && (last->akid_id || last->akid_skid)) {
- key = x509_request_asymmetric_key(trust_keyring,
- last->akid_id,
- last->akid_skid,
- false);
+ if (last && (last->sig->auth_ids[0] || last->sig->auth_ids[1])) {
+ key = find_asymmetric_key(trust_keyring,
+ last->sig->auth_ids[0],
+ last->sig->auth_ids[1],
+ false);
if (!IS_ERR(key)) {
x509 = last;
pr_devel("sinfo %u: Root cert %u signer is key %x\n",
@@ -104,10 +100,8 @@ static int pkcs7_validate_trust_one(struct pkcs7_message *pkcs7,
/* As a last resort, see if we have a trusted public key that matches
* the signed info directly.
*/
- key = x509_request_asymmetric_key(trust_keyring,
- sinfo->signing_cert_id,
- NULL,
- false);
+ key = find_asymmetric_key(trust_keyring,
+ sinfo->sig->auth_ids[0], NULL, false);
if (!IS_ERR(key)) {
pr_devel("sinfo %u: Direct signer is key %x\n",
sinfo->index, key_serial(key));
@@ -122,7 +116,6 @@ static int pkcs7_validate_trust_one(struct pkcs7_message *pkcs7,
matched:
ret = verify_signature(key, sig);
- trusted = test_bit(KEY_FLAG_TRUSTED, &key->flags);
key_put(key);
if (ret < 0) {
if (ret == -ENOMEM)
@@ -134,12 +127,9 @@ matched:
verified:
if (x509) {
x509->verified = true;
- for (p = sinfo->signer; p != x509; p = p->signer) {
+ for (p = sinfo->signer; p != x509; p = p->signer)
p->verified = true;
- p->trusted = trusted;
- }
}
- sinfo->trusted = trusted;
kleave(" = 0");
return 0;
}
@@ -148,7 +138,6 @@ verified:
* pkcs7_validate_trust - Validate PKCS#7 trust chain
* @pkcs7: The PKCS#7 certificate to validate
* @trust_keyring: Signing certificates to use as starting points
- * @_trusted: Set to true if trustworth, false otherwise
*
* Validate that the certificate chain inside the PKCS#7 message intersects
* keys we already know and trust.
@@ -170,16 +159,13 @@ verified:
* May also return -ENOMEM.
*/
int pkcs7_validate_trust(struct pkcs7_message *pkcs7,
- struct key *trust_keyring,
- bool *_trusted)
+ struct key *trust_keyring)
{
struct pkcs7_signed_info *sinfo;
struct x509_certificate *p;
int cached_ret = -ENOKEY;
int ret;
- *_trusted = false;
-
for (p = pkcs7->certs; p; p = p->next)
p->seen = false;
@@ -193,7 +179,6 @@ int pkcs7_validate_trust(struct pkcs7_message *pkcs7,
cached_ret = -ENOPKG;
continue;
case 0:
- *_trusted |= sinfo->trusted;
cached_ret = 0;
continue;
default:
diff --git a/crypto/asymmetric_keys/pkcs7_verify.c b/crypto/asymmetric_keys/pkcs7_verify.c
index 50be2a15e..2ffd69769 100644
--- a/crypto/asymmetric_keys/pkcs7_verify.c
+++ b/crypto/asymmetric_keys/pkcs7_verify.c
@@ -25,34 +25,36 @@
static int pkcs7_digest(struct pkcs7_message *pkcs7,
struct pkcs7_signed_info *sinfo)
{
+ struct public_key_signature *sig = sinfo->sig;
struct crypto_shash *tfm;
struct shash_desc *desc;
- size_t digest_size, desc_size;
- void *digest;
+ size_t desc_size;
int ret;
- kenter(",%u,%s", sinfo->index, sinfo->sig.hash_algo);
+ kenter(",%u,%s", sinfo->index, sinfo->sig->hash_algo);
- if (!sinfo->sig.hash_algo)
+ if (!sinfo->sig->hash_algo)
return -ENOPKG;
/* Allocate the hashing algorithm we're going to need and find out how
* big the hash operational data will be.
*/
- tfm = crypto_alloc_shash(sinfo->sig.hash_algo, 0, 0);
+ tfm = crypto_alloc_shash(sinfo->sig->hash_algo, 0, 0);
if (IS_ERR(tfm))
return (PTR_ERR(tfm) == -ENOENT) ? -ENOPKG : PTR_ERR(tfm);
desc_size = crypto_shash_descsize(tfm) + sizeof(*desc);
- sinfo->sig.digest_size = digest_size = crypto_shash_digestsize(tfm);
+ sig->digest_size = crypto_shash_digestsize(tfm);
ret = -ENOMEM;
- digest = kzalloc(ALIGN(digest_size, __alignof__(*desc)) + desc_size,
- GFP_KERNEL);
- if (!digest)
+ sig->digest = kmalloc(sig->digest_size, GFP_KERNEL);
+ if (!sig->digest)
+ goto error_no_desc;
+
+ desc = kzalloc(desc_size, GFP_KERNEL);
+ if (!desc)
goto error_no_desc;
- desc = PTR_ALIGN(digest + digest_size, __alignof__(*desc));
desc->tfm = tfm;
desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
@@ -60,10 +62,11 @@ static int pkcs7_digest(struct pkcs7_message *pkcs7,
ret = crypto_shash_init(desc);
if (ret < 0)
goto error;
- ret = crypto_shash_finup(desc, pkcs7->data, pkcs7->data_len, digest);
+ ret = crypto_shash_finup(desc, pkcs7->data, pkcs7->data_len,
+ sig->digest);
if (ret < 0)
goto error;
- pr_devel("MsgDigest = [%*ph]\n", 8, digest);
+ pr_devel("MsgDigest = [%*ph]\n", 8, sig->digest);
/* However, if there are authenticated attributes, there must be a
* message digest attribute amongst them which corresponds to the
@@ -78,14 +81,15 @@ static int pkcs7_digest(struct pkcs7_message *pkcs7,
goto error;
}
- if (sinfo->msgdigest_len != sinfo->sig.digest_size) {
+ if (sinfo->msgdigest_len != sig->digest_size) {
pr_debug("Sig %u: Invalid digest size (%u)\n",
sinfo->index, sinfo->msgdigest_len);
ret = -EBADMSG;
goto error;
}
- if (memcmp(digest, sinfo->msgdigest, sinfo->msgdigest_len) != 0) {
+ if (memcmp(sig->digest, sinfo->msgdigest,
+ sinfo->msgdigest_len) != 0) {
pr_debug("Sig %u: Message digest doesn't match\n",
sinfo->index);
ret = -EKEYREJECTED;
@@ -97,7 +101,7 @@ static int pkcs7_digest(struct pkcs7_message *pkcs7,
* convert the attributes from a CONT.0 into a SET before we
* hash it.
*/
- memset(digest, 0, sinfo->sig.digest_size);
+ memset(sig->digest, 0, sig->digest_size);
ret = crypto_shash_init(desc);
if (ret < 0)
@@ -107,17 +111,14 @@ static int pkcs7_digest(struct pkcs7_message *pkcs7,
if (ret < 0)
goto error;
ret = crypto_shash_finup(desc, sinfo->authattrs,
- sinfo->authattrs_len, digest);
+ sinfo->authattrs_len, sig->digest);
if (ret < 0)
goto error;
- pr_devel("AADigest = [%*ph]\n", 8, digest);
+ pr_devel("AADigest = [%*ph]\n", 8, sig->digest);
}
- sinfo->sig.digest = digest;
- digest = NULL;
-
error:
- kfree(digest);
+ kfree(desc);
error_no_desc:
crypto_free_shash(tfm);
kleave(" = %d", ret);
@@ -144,12 +145,12 @@ static int pkcs7_find_key(struct pkcs7_message *pkcs7,
* PKCS#7 message - but I can't be 100% sure of that. It's
* possible this will need element-by-element comparison.
*/
- if (!asymmetric_key_id_same(x509->id, sinfo->signing_cert_id))
+ if (!asymmetric_key_id_same(x509->id, sinfo->sig->auth_ids[0]))
continue;
pr_devel("Sig %u: Found cert serial match X.509[%u]\n",
sinfo->index, certix);
- if (x509->pub->pkey_algo != sinfo->sig.pkey_algo) {
+ if (x509->pub->pkey_algo != sinfo->sig->pkey_algo) {
pr_warn("Sig %u: X.509 algo and PKCS#7 sig algo don't match\n",
sinfo->index);
continue;
@@ -164,7 +165,7 @@ static int pkcs7_find_key(struct pkcs7_message *pkcs7,
*/
pr_debug("Sig %u: Issuing X.509 cert not found (#%*phN)\n",
sinfo->index,
- sinfo->signing_cert_id->len, sinfo->signing_cert_id->data);
+ sinfo->sig->auth_ids[0]->len, sinfo->sig->auth_ids[0]->data);
return 0;
}
@@ -174,6 +175,7 @@ static int pkcs7_find_key(struct pkcs7_message *pkcs7,
static int pkcs7_verify_sig_chain(struct pkcs7_message *pkcs7,
struct pkcs7_signed_info *sinfo)
{
+ struct public_key_signature *sig;
struct x509_certificate *x509 = sinfo->signer, *p;
struct asymmetric_key_id *auth;
int ret;
@@ -188,34 +190,26 @@ static int pkcs7_verify_sig_chain(struct pkcs7_message *pkcs7,
x509->subject,
x509->raw_serial_size, x509->raw_serial);
x509->seen = true;
- ret = x509_get_sig_params(x509);
- if (ret < 0)
- goto maybe_missing_crypto_in_x509;
+ if (x509->unsupported_key)
+ goto unsupported_crypto_in_x509;
pr_debug("- issuer %s\n", x509->issuer);
- if (x509->akid_id)
+ sig = x509->sig;
+ if (sig->auth_ids[0])
pr_debug("- authkeyid.id %*phN\n",
- x509->akid_id->len, x509->akid_id->data);
- if (x509->akid_skid)
+ sig->auth_ids[0]->len, sig->auth_ids[0]->data);
+ if (sig->auth_ids[1])
pr_debug("- authkeyid.skid %*phN\n",
- x509->akid_skid->len, x509->akid_skid->data);
+ sig->auth_ids[1]->len, sig->auth_ids[1]->data);
- if ((!x509->akid_id && !x509->akid_skid) ||
- strcmp(x509->subject, x509->issuer) == 0) {
+ if (x509->self_signed) {
/* If there's no authority certificate specified, then
* the certificate must be self-signed and is the root
* of the chain. Likewise if the cert is its own
* authority.
*/
- pr_debug("- no auth?\n");
- if (x509->raw_subject_size != x509->raw_issuer_size ||
- memcmp(x509->raw_subject, x509->raw_issuer,
- x509->raw_issuer_size) != 0)
- return 0;
-
- ret = x509_check_signature(x509->pub, x509);
- if (ret < 0)
- goto maybe_missing_crypto_in_x509;
+ if (x509->unsupported_sig)
+ goto unsupported_crypto_in_x509;
x509->signer = x509;
pr_debug("- self-signed\n");
return 0;
@@ -224,7 +218,7 @@ static int pkcs7_verify_sig_chain(struct pkcs7_message *pkcs7,
/* Look through the X.509 certificates in the PKCS#7 message's
* list to see if the next one is there.
*/
- auth = x509->akid_id;
+ auth = sig->auth_ids[0];
if (auth) {
pr_debug("- want %*phN\n", auth->len, auth->data);
for (p = pkcs7->certs; p; p = p->next) {
@@ -233,8 +227,8 @@ static int pkcs7_verify_sig_chain(struct pkcs7_message *pkcs7,
if (asymmetric_key_id_same(p->id, auth))
goto found_issuer_check_skid;
}
- } else {
- auth = x509->akid_skid;
+ } else if (sig->auth_ids[1]) {
+ auth = sig->auth_ids[1];
pr_debug("- want %*phN\n", auth->len, auth->data);
for (p = pkcs7->certs; p; p = p->next) {
if (!p->skid)
@@ -254,8 +248,8 @@ static int pkcs7_verify_sig_chain(struct pkcs7_message *pkcs7,
/* We matched issuer + serialNumber, but if there's an
* authKeyId.keyId, that must match the CA subjKeyId also.
*/
- if (x509->akid_skid &&
- !asymmetric_key_id_same(p->skid, x509->akid_skid)) {
+ if (sig->auth_ids[1] &&
+ !asymmetric_key_id_same(p->skid, sig->auth_ids[1])) {
pr_warn("Sig %u: X.509 chain contains auth-skid nonmatch (%u->%u)\n",
sinfo->index, x509->index, p->index);
return -EKEYREJECTED;
@@ -267,7 +261,7 @@ static int pkcs7_verify_sig_chain(struct pkcs7_message *pkcs7,
sinfo->index);
return 0;
}
- ret = x509_check_signature(p->pub, x509);
+ ret = public_key_verify_signature(p->pub, p->sig);
if (ret < 0)
return ret;
x509->signer = p;
@@ -279,16 +273,14 @@ static int pkcs7_verify_sig_chain(struct pkcs7_message *pkcs7,
might_sleep();
}
-maybe_missing_crypto_in_x509:
+unsupported_crypto_in_x509:
/* Just prune the certificate chain at this point if we lack some
* crypto module to go further. Note, however, we don't want to set
- * sinfo->missing_crypto as the signed info block may still be
+ * sinfo->unsupported_crypto as the signed info block may still be
* validatable against an X.509 cert lower in the chain that we have a
* trusted copy of.
*/
- if (ret == -ENOPKG)
- return 0;
- return ret;
+ return 0;
}
/*
@@ -332,7 +324,7 @@ static int pkcs7_verify_one(struct pkcs7_message *pkcs7,
}
/* Verify the PKCS#7 binary against the key */
- ret = public_key_verify_signature(sinfo->signer->pub, &sinfo->sig);
+ ret = public_key_verify_signature(sinfo->signer->pub, sinfo->sig);
if (ret < 0)
return ret;
@@ -375,9 +367,8 @@ int pkcs7_verify(struct pkcs7_message *pkcs7,
enum key_being_used_for usage)
{
struct pkcs7_signed_info *sinfo;
- struct x509_certificate *x509;
int enopkg = -ENOPKG;
- int ret, n;
+ int ret;
kenter("");
@@ -419,12 +410,6 @@ int pkcs7_verify(struct pkcs7_message *pkcs7,
return -EINVAL;
}
- for (n = 0, x509 = pkcs7->certs; x509; x509 = x509->next, n++) {
- ret = x509_get_sig_params(x509);
- if (ret < 0)
- return ret;
- }
-
for (sinfo = pkcs7->signed_infos; sinfo; sinfo = sinfo->next) {
ret = pkcs7_verify_one(pkcs7, sinfo);
if (ret < 0) {
diff --git a/crypto/asymmetric_keys/public_key.c b/crypto/asymmetric_keys/public_key.c
index 0f8b264b3..fd76b5fc3 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/restrict.c b/crypto/asymmetric_keys/restrict.c
new file mode 100644
index 000000000..19d1afb98
--- /dev/null
+++ b/crypto/asymmetric_keys/restrict.c
@@ -0,0 +1,108 @@
+/* Instantiate a public key crypto key from an X.509 Certificate
+ *
+ * Copyright (C) 2012, 2016 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#define pr_fmt(fmt) "ASYM: "fmt
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <crypto/public_key.h>
+#include "asymmetric_keys.h"
+
+static bool use_builtin_keys;
+static struct asymmetric_key_id *ca_keyid;
+
+#ifndef MODULE
+static struct {
+ struct asymmetric_key_id id;
+ unsigned char data[10];
+} cakey;
+
+static int __init ca_keys_setup(char *str)
+{
+ if (!str) /* default system keyring */
+ return 1;
+
+ if (strncmp(str, "id:", 3) == 0) {
+ struct asymmetric_key_id *p = &cakey.id;
+ size_t hexlen = (strlen(str) - 3) / 2;
+ int ret;
+
+ if (hexlen == 0 || hexlen > sizeof(cakey.data)) {
+ pr_err("Missing or invalid ca_keys id\n");
+ return 1;
+ }
+
+ ret = __asymmetric_key_hex_to_key_id(str + 3, p, hexlen);
+ if (ret < 0)
+ pr_err("Unparsable ca_keys id hex string\n");
+ else
+ ca_keyid = p; /* owner key 'id:xxxxxx' */
+ } else if (strcmp(str, "builtin") == 0) {
+ use_builtin_keys = true;
+ }
+
+ return 1;
+}
+__setup("ca_keys=", ca_keys_setup);
+#endif
+
+/**
+ * restrict_link_by_signature - Restrict additions to a ring of public keys
+ * @trust_keyring: A ring of keys that can be used to vouch for the new cert.
+ * @type: The type of key being added.
+ * @payload: The payload of the new key.
+ *
+ * Check the new certificate against the ones in the trust keyring. If one of
+ * those is the signing key and validates the new certificate, then mark the
+ * new certificate as being trusted.
+ *
+ * Returns 0 if the new certificate was accepted, -ENOKEY if we couldn't find a
+ * matching parent certificate in the trusted list, -EKEYREJECTED if the
+ * signature check fails or the key is blacklisted and some other error if
+ * there is a matching certificate but the signature check cannot be performed.
+ */
+int restrict_link_by_signature(struct key *trust_keyring,
+ const struct key_type *type,
+ const union key_payload *payload)
+{
+ const struct public_key_signature *sig;
+ struct key *key;
+ int ret;
+
+ pr_devel("==>%s()\n", __func__);
+
+ if (!trust_keyring)
+ return -ENOKEY;
+
+ if (type != &key_type_asymmetric)
+ return -EOPNOTSUPP;
+
+ sig = payload->data[asym_auth];
+ if (!sig->auth_ids[0] && !sig->auth_ids[1])
+ return -ENOKEY;
+
+ if (ca_keyid && !asymmetric_key_id_partial(sig->auth_ids[1], ca_keyid))
+ return -EPERM;
+
+ /* See if we have a key that signed this one. */
+ key = find_asymmetric_key(trust_keyring,
+ sig->auth_ids[0], sig->auth_ids[1],
+ false);
+ if (IS_ERR(key))
+ return -ENOKEY;
+
+ if (use_builtin_keys && !test_bit(KEY_FLAG_BUILTIN, &key->flags))
+ ret = -ENOKEY;
+ else
+ ret = verify_signature(key, sig);
+ key_put(key);
+ return ret;
+}
diff --git a/crypto/asymmetric_keys/signature.c b/crypto/asymmetric_keys/signature.c
index 004d5fc8e..11b7ba170 100644
--- a/crypto/asymmetric_keys/signature.c
+++ b/crypto/asymmetric_keys/signature.c
@@ -15,9 +15,27 @@
#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)
+{
+ int i;
+
+ if (sig) {
+ for (i = 0; i < ARRAY_SIZE(sig->auth_ids); i++)
+ kfree(sig->auth_ids[i]);
+ 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/verify_pefile.c b/crypto/asymmetric_keys/verify_pefile.c
index 7e8c2338a..672a94c2c 100644
--- a/crypto/asymmetric_keys/verify_pefile.c
+++ b/crypto/asymmetric_keys/verify_pefile.c
@@ -16,7 +16,7 @@
#include <linux/err.h>
#include <linux/pe.h>
#include <linux/asn1.h>
-#include <crypto/pkcs7.h>
+#include <linux/verification.h>
#include <crypto/hash.h>
#include "verify_pefile.h"
@@ -392,9 +392,8 @@ error_no_desc:
* verify_pefile_signature - Verify the signature on a PE binary image
* @pebuf: Buffer containing the PE binary image
* @pelen: Length of the binary image
- * @trust_keyring: Signing certificates to use as starting points
+ * @trust_keys: Signing certificate(s) to use as starting points
* @usage: The use to which the key is being put.
- * @_trusted: Set to true if trustworth, false otherwise
*
* Validate that the certificate chain inside the PKCS#7 message inside the PE
* binary image intersects keys we already know and trust.
@@ -418,14 +417,10 @@ error_no_desc:
* May also return -ENOMEM.
*/
int verify_pefile_signature(const void *pebuf, unsigned pelen,
- struct key *trusted_keyring,
- enum key_being_used_for usage,
- bool *_trusted)
+ struct key *trusted_keys,
+ enum key_being_used_for usage)
{
- struct pkcs7_message *pkcs7;
struct pefile_context ctx;
- const void *data;
- size_t datalen;
int ret;
kenter("");
@@ -439,19 +434,10 @@ int verify_pefile_signature(const void *pebuf, unsigned pelen,
if (ret < 0)
return ret;
- pkcs7 = pkcs7_parse_message(pebuf + ctx.sig_offset, ctx.sig_len);
- if (IS_ERR(pkcs7))
- return PTR_ERR(pkcs7);
- ctx.pkcs7 = pkcs7;
-
- ret = pkcs7_get_content_data(ctx.pkcs7, &data, &datalen, false);
- if (ret < 0 || datalen == 0) {
- pr_devel("PKCS#7 message does not contain data\n");
- ret = -EBADMSG;
- goto error;
- }
-
- ret = mscode_parse(&ctx);
+ ret = verify_pkcs7_signature(NULL, 0,
+ pebuf + ctx.sig_offset, ctx.sig_len,
+ trusted_keys, usage,
+ mscode_parse, &ctx);
if (ret < 0)
goto error;
@@ -462,16 +448,8 @@ int verify_pefile_signature(const void *pebuf, unsigned pelen,
* contents.
*/
ret = pefile_digest_pe(pebuf, pelen, &ctx);
- if (ret < 0)
- goto error;
-
- ret = pkcs7_verify(pkcs7, usage);
- if (ret < 0)
- goto error;
-
- ret = pkcs7_validate_trust(pkcs7, trusted_keyring, _trusted);
error:
- pkcs7_free_message(ctx.pkcs7);
+ kfree(ctx.digest);
return ret;
}
diff --git a/crypto/asymmetric_keys/verify_pefile.h b/crypto/asymmetric_keys/verify_pefile.h
index a133eb81a..cd4d20930 100644
--- a/crypto/asymmetric_keys/verify_pefile.h
+++ b/crypto/asymmetric_keys/verify_pefile.h
@@ -9,7 +9,6 @@
* 2 of the Licence, or (at your option) any later version.
*/
-#include <linux/verify_pefile.h>
#include <crypto/pkcs7.h>
#include <crypto/hash_info.h>
@@ -23,7 +22,6 @@ struct pefile_context {
unsigned sig_offset;
unsigned sig_len;
const struct section_header *secs;
- struct pkcs7_message *pkcs7;
/* PKCS#7 MS Individual Code Signing content */
const void *digest; /* Digest */
@@ -39,4 +37,5 @@ struct pefile_context {
/*
* mscode_parser.c
*/
-extern int mscode_parse(struct pefile_context *ctx);
+extern int mscode_parse(void *_ctx, const void *content_data, size_t data_len,
+ size_t asn1hdrlen);
diff --git a/crypto/asymmetric_keys/x509_cert_parser.c b/crypto/asymmetric_keys/x509_cert_parser.c
index 4a29bac70..865f46ea7 100644
--- a/crypto/asymmetric_keys/x509_cert_parser.c
+++ b/crypto/asymmetric_keys/x509_cert_parser.c
@@ -47,15 +47,12 @@ struct x509_parse_context {
void x509_free_certificate(struct x509_certificate *cert)
{
if (cert) {
- public_key_destroy(cert->pub);
+ public_key_free(cert->pub);
+ public_key_signature_free(cert->sig);
kfree(cert->issuer);
kfree(cert->subject);
kfree(cert->id);
kfree(cert->skid);
- kfree(cert->akid_id);
- kfree(cert->akid_skid);
- kfree(cert->sig.digest);
- kfree(cert->sig.s);
kfree(cert);
}
}
@@ -78,6 +75,9 @@ struct x509_certificate *x509_cert_parse(const void *data, size_t datalen)
cert->pub = kzalloc(sizeof(struct public_key), GFP_KERNEL);
if (!cert->pub)
goto error_no_ctx;
+ cert->sig = kzalloc(sizeof(struct public_key_signature), GFP_KERNEL);
+ if (!cert->sig)
+ goto error_no_ctx;
ctx = kzalloc(sizeof(struct x509_parse_context), GFP_KERNEL);
if (!ctx)
goto error_no_ctx;
@@ -108,6 +108,11 @@ struct x509_certificate *x509_cert_parse(const void *data, size_t datalen)
cert->pub->keylen = ctx->key_size;
+ /* Grab the signature bits */
+ ret = x509_get_sig_params(cert);
+ if (ret < 0)
+ goto error_decode;
+
/* Generate cert issuer + serial number key ID */
kid = asymmetric_key_generate_id(cert->raw_serial,
cert->raw_serial_size,
@@ -119,6 +124,11 @@ struct x509_certificate *x509_cert_parse(const void *data, size_t datalen)
}
cert->id = kid;
+ /* Detect self-signed certificates */
+ ret = x509_check_for_self_signed(cert);
+ if (ret < 0)
+ goto error_decode;
+
kfree(ctx);
return cert;
@@ -188,33 +198,33 @@ int x509_note_pkey_algo(void *context, size_t hdrlen,
return -ENOPKG; /* Unsupported combination */
case OID_md4WithRSAEncryption:
- ctx->cert->sig.hash_algo = "md4";
- ctx->cert->sig.pkey_algo = "rsa";
+ ctx->cert->sig->hash_algo = "md4";
+ ctx->cert->sig->pkey_algo = "rsa";
break;
case OID_sha1WithRSAEncryption:
- ctx->cert->sig.hash_algo = "sha1";
- ctx->cert->sig.pkey_algo = "rsa";
+ ctx->cert->sig->hash_algo = "sha1";
+ ctx->cert->sig->pkey_algo = "rsa";
break;
case OID_sha256WithRSAEncryption:
- ctx->cert->sig.hash_algo = "sha256";
- ctx->cert->sig.pkey_algo = "rsa";
+ ctx->cert->sig->hash_algo = "sha256";
+ ctx->cert->sig->pkey_algo = "rsa";
break;
case OID_sha384WithRSAEncryption:
- ctx->cert->sig.hash_algo = "sha384";
- ctx->cert->sig.pkey_algo = "rsa";
+ ctx->cert->sig->hash_algo = "sha384";
+ ctx->cert->sig->pkey_algo = "rsa";
break;
case OID_sha512WithRSAEncryption:
- ctx->cert->sig.hash_algo = "sha512";
- ctx->cert->sig.pkey_algo = "rsa";
+ ctx->cert->sig->hash_algo = "sha512";
+ ctx->cert->sig->pkey_algo = "rsa";
break;
case OID_sha224WithRSAEncryption:
- ctx->cert->sig.hash_algo = "sha224";
- ctx->cert->sig.pkey_algo = "rsa";
+ ctx->cert->sig->hash_algo = "sha224";
+ ctx->cert->sig->pkey_algo = "rsa";
break;
}
@@ -572,14 +582,14 @@ int x509_akid_note_kid(void *context, size_t hdrlen,
pr_debug("AKID: keyid: %*phN\n", (int)vlen, value);
- if (ctx->cert->akid_skid)
+ if (ctx->cert->sig->auth_ids[1])
return 0;
kid = asymmetric_key_generate_id(value, vlen, "", 0);
if (IS_ERR(kid))
return PTR_ERR(kid);
pr_debug("authkeyid %*phN\n", kid->len, kid->data);
- ctx->cert->akid_skid = kid;
+ ctx->cert->sig->auth_ids[1] = kid;
return 0;
}
@@ -611,7 +621,7 @@ int x509_akid_note_serial(void *context, size_t hdrlen,
pr_debug("AKID: serial: %*phN\n", (int)vlen, value);
- if (!ctx->akid_raw_issuer || ctx->cert->akid_id)
+ if (!ctx->akid_raw_issuer || ctx->cert->sig->auth_ids[0])
return 0;
kid = asymmetric_key_generate_id(value,
@@ -622,6 +632,6 @@ int x509_akid_note_serial(void *context, size_t hdrlen,
return PTR_ERR(kid);
pr_debug("authkeyid %*phN\n", kid->len, kid->data);
- ctx->cert->akid_id = kid;
+ ctx->cert->sig->auth_ids[0] = kid;
return 0;
}
diff --git a/crypto/asymmetric_keys/x509_parser.h b/crypto/asymmetric_keys/x509_parser.h
index dbeed6018..05eef1c68 100644
--- a/crypto/asymmetric_keys/x509_parser.h
+++ b/crypto/asymmetric_keys/x509_parser.h
@@ -17,13 +17,11 @@ struct x509_certificate {
struct x509_certificate *next;
struct x509_certificate *signer; /* Certificate that signed this one */
struct public_key *pub; /* Public key details */
- struct public_key_signature sig; /* Signature parameters */
+ struct public_key_signature *sig; /* Signature parameters */
char *issuer; /* Name of certificate issuer */
char *subject; /* Name of certificate subject */
struct asymmetric_key_id *id; /* Issuer + Serial number */
struct asymmetric_key_id *skid; /* Subject + subjectKeyId (optional) */
- struct asymmetric_key_id *akid_id; /* CA AuthKeyId matching ->id (optional) */
- struct asymmetric_key_id *akid_skid; /* CA AuthKeyId matching ->skid (optional) */
time64_t valid_from;
time64_t valid_to;
const void *tbs; /* Signed data */
@@ -41,8 +39,9 @@ struct x509_certificate {
unsigned index;
bool seen; /* Infinite recursion prevention */
bool verified;
- bool trusted;
- bool unsupported_crypto; /* T if can't be verified due to missing crypto */
+ bool self_signed; /* T if self-signed (check unsupported_sig too) */
+ bool unsupported_key; /* T if key uses unsupported crypto */
+ bool unsupported_sig; /* T if signature uses unsupported crypto */
};
/*
@@ -58,5 +57,4 @@ extern int x509_decode_time(time64_t *_t, size_t hdrlen,
* x509_public_key.c
*/
extern int x509_get_sig_params(struct x509_certificate *cert);
-extern int x509_check_signature(const struct public_key *pub,
- struct x509_certificate *cert);
+extern int x509_check_for_self_signed(struct x509_certificate *cert);
diff --git a/crypto/asymmetric_keys/x509_public_key.c b/crypto/asymmetric_keys/x509_public_key.c
index 733c046aa..fb732296c 100644
--- a/crypto/asymmetric_keys/x509_public_key.c
+++ b/crypto/asymmetric_keys/x509_public_key.c
@@ -20,256 +20,133 @@
#include "asymmetric_keys.h"
#include "x509_parser.h"
-static bool use_builtin_keys;
-static struct asymmetric_key_id *ca_keyid;
-
-#ifndef MODULE
-static struct {
- struct asymmetric_key_id id;
- unsigned char data[10];
-} cakey;
-
-static int __init ca_keys_setup(char *str)
-{
- if (!str) /* default system keyring */
- return 1;
-
- if (strncmp(str, "id:", 3) == 0) {
- struct asymmetric_key_id *p = &cakey.id;
- size_t hexlen = (strlen(str) - 3) / 2;
- int ret;
-
- if (hexlen == 0 || hexlen > sizeof(cakey.data)) {
- pr_err("Missing or invalid ca_keys id\n");
- return 1;
- }
-
- ret = __asymmetric_key_hex_to_key_id(str + 3, p, hexlen);
- if (ret < 0)
- pr_err("Unparsable ca_keys id hex string\n");
- else
- ca_keyid = p; /* owner key 'id:xxxxxx' */
- } else if (strcmp(str, "builtin") == 0) {
- use_builtin_keys = true;
- }
-
- return 1;
-}
-__setup("ca_keys=", ca_keys_setup);
-#endif
-
-/**
- * x509_request_asymmetric_key - Request a key by X.509 certificate params.
- * @keyring: The keys to search.
- * @id: The issuer & serialNumber to look for or NULL.
- * @skid: The subjectKeyIdentifier to look for or NULL.
- * @partial: Use partial match if true, exact if false.
- *
- * Find a key in the given keyring by identifier. The preferred identifier is
- * the issuer + serialNumber and the fallback identifier is the
- * subjectKeyIdentifier. If both are given, the lookup is by the former, but
- * the latter must also match.
- */
-struct key *x509_request_asymmetric_key(struct key *keyring,
- const struct asymmetric_key_id *id,
- const struct asymmetric_key_id *skid,
- bool partial)
-{
- struct key *key;
- key_ref_t ref;
- const char *lookup;
- char *req, *p;
- int len;
-
- if (id) {
- lookup = id->data;
- len = id->len;
- } else {
- lookup = skid->data;
- len = skid->len;
- }
-
- /* Construct an identifier "id:<keyid>". */
- p = req = kmalloc(2 + 1 + len * 2 + 1, GFP_KERNEL);
- if (!req)
- return ERR_PTR(-ENOMEM);
-
- if (partial) {
- *p++ = 'i';
- *p++ = 'd';
- } else {
- *p++ = 'e';
- *p++ = 'x';
- }
- *p++ = ':';
- p = bin2hex(p, lookup, len);
- *p = 0;
-
- pr_debug("Look up: \"%s\"\n", req);
-
- ref = keyring_search(make_key_ref(keyring, 1),
- &key_type_asymmetric, req);
- if (IS_ERR(ref))
- pr_debug("Request for key '%s' err %ld\n", req, PTR_ERR(ref));
- kfree(req);
-
- if (IS_ERR(ref)) {
- switch (PTR_ERR(ref)) {
- /* Hide some search errors */
- case -EACCES:
- case -ENOTDIR:
- case -EAGAIN:
- return ERR_PTR(-ENOKEY);
- default:
- return ERR_CAST(ref);
- }
- }
-
- key = key_ref_to_ptr(ref);
- if (id && skid) {
- const struct asymmetric_key_ids *kids = asymmetric_key_ids(key);
- if (!kids->id[1]) {
- pr_debug("issuer+serial match, but expected SKID missing\n");
- goto reject;
- }
- if (!asymmetric_key_id_same(skid, kids->id[1])) {
- pr_debug("issuer+serial match, but SKID does not\n");
- goto reject;
- }
- }
-
- pr_devel("<==%s() = 0 [%x]\n", __func__, key_serial(key));
- return key;
-
-reject:
- key_put(key);
- return ERR_PTR(-EKEYREJECTED);
-}
-EXPORT_SYMBOL_GPL(x509_request_asymmetric_key);
-
/*
* Set up the signature parameters in an X.509 certificate. This involves
* digesting the signed data and extracting the signature.
*/
int x509_get_sig_params(struct x509_certificate *cert)
{
+ struct public_key_signature *sig = cert->sig;
struct crypto_shash *tfm;
struct shash_desc *desc;
- size_t digest_size, desc_size;
- void *digest;
+ size_t desc_size;
int ret;
pr_devel("==>%s()\n", __func__);
- if (cert->unsupported_crypto)
- return -ENOPKG;
- if (cert->sig.s)
+ if (!cert->pub->pkey_algo)
+ cert->unsupported_key = true;
+
+ if (!sig->pkey_algo)
+ cert->unsupported_sig = true;
+
+ /* We check the hash if we can - even if we can't then verify it */
+ if (!sig->hash_algo) {
+ cert->unsupported_sig = true;
return 0;
+ }
- cert->sig.s = kmemdup(cert->raw_sig, cert->raw_sig_size,
- GFP_KERNEL);
- if (!cert->sig.s)
+ sig->s = kmemdup(cert->raw_sig, cert->raw_sig_size, GFP_KERNEL);
+ if (!sig->s)
return -ENOMEM;
- cert->sig.s_size = cert->raw_sig_size;
+ sig->s_size = cert->raw_sig_size;
/* Allocate the hashing algorithm we're going to need and find out how
* big the hash operational data will be.
*/
- tfm = crypto_alloc_shash(cert->sig.hash_algo, 0, 0);
+ tfm = crypto_alloc_shash(sig->hash_algo, 0, 0);
if (IS_ERR(tfm)) {
if (PTR_ERR(tfm) == -ENOENT) {
- cert->unsupported_crypto = true;
- return -ENOPKG;
+ cert->unsupported_sig = true;
+ return 0;
}
return PTR_ERR(tfm);
}
desc_size = crypto_shash_descsize(tfm) + sizeof(*desc);
- digest_size = crypto_shash_digestsize(tfm);
+ sig->digest_size = crypto_shash_digestsize(tfm);
- /* We allocate the hash operational data storage on the end of the
- * digest storage space.
- */
ret = -ENOMEM;
- digest = kzalloc(ALIGN(digest_size, __alignof__(*desc)) + desc_size,
- GFP_KERNEL);
- if (!digest)
+ sig->digest = kmalloc(sig->digest_size, GFP_KERNEL);
+ if (!sig->digest)
goto error;
- cert->sig.digest = digest;
- cert->sig.digest_size = digest_size;
+ desc = kzalloc(desc_size, GFP_KERNEL);
+ if (!desc)
+ goto error;
- desc = PTR_ALIGN(digest + digest_size, __alignof__(*desc));
desc->tfm = tfm;
desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
ret = crypto_shash_init(desc);
if (ret < 0)
- goto error;
+ goto error_2;
might_sleep();
- ret = crypto_shash_finup(desc, cert->tbs, cert->tbs_size, digest);
+ ret = crypto_shash_finup(desc, cert->tbs, cert->tbs_size, sig->digest);
+
+error_2:
+ kfree(desc);
error:
crypto_free_shash(tfm);
pr_devel("<==%s() = %d\n", __func__, ret);
return ret;
}
-EXPORT_SYMBOL_GPL(x509_get_sig_params);
/*
- * Check the signature on a certificate using the provided public key
+ * Check for self-signedness in an X.509 cert and if found, check the signature
+ * immediately if we can.
*/
-int x509_check_signature(const struct public_key *pub,
- struct x509_certificate *cert)
+int x509_check_for_self_signed(struct x509_certificate *cert)
{
- int ret;
+ int ret = 0;
pr_devel("==>%s()\n", __func__);
- ret = x509_get_sig_params(cert);
- if (ret < 0)
- return ret;
+ if (cert->raw_subject_size != cert->raw_issuer_size ||
+ memcmp(cert->raw_subject, cert->raw_issuer,
+ cert->raw_issuer_size) != 0)
+ goto not_self_signed;
+
+ if (cert->sig->auth_ids[0] || cert->sig->auth_ids[1]) {
+ /* If the AKID is present it may have one or two parts. If
+ * both are supplied, both must match.
+ */
+ bool a = asymmetric_key_id_same(cert->skid, cert->sig->auth_ids[1]);
+ bool b = asymmetric_key_id_same(cert->id, cert->sig->auth_ids[0]);
+
+ if (!a && !b)
+ goto not_self_signed;
+
+ ret = -EKEYREJECTED;
+ if (((a && !b) || (b && !a)) &&
+ cert->sig->auth_ids[0] && cert->sig->auth_ids[1])
+ goto out;
+ }
- ret = public_key_verify_signature(pub, &cert->sig);
- if (ret == -ENOPKG)
- cert->unsupported_crypto = true;
- pr_debug("Cert Verification: %d\n", ret);
- return ret;
-}
-EXPORT_SYMBOL_GPL(x509_check_signature);
+ ret = -EKEYREJECTED;
+ if (cert->pub->pkey_algo != cert->sig->pkey_algo)
+ goto out;
-/*
- * Check the new certificate against the ones in the trust keyring. If one of
- * those is the signing key and validates the new certificate, then mark the
- * new certificate as being trusted.
- *
- * Return 0 if the new certificate was successfully validated, 1 if we couldn't
- * find a matching parent certificate in the trusted list and an error if there
- * is a matching certificate but the signature check fails.
- */
-static int x509_validate_trust(struct x509_certificate *cert,
- struct key *trust_keyring)
-{
- struct key *key;
- int ret = 1;
-
- if (!trust_keyring)
- return -EOPNOTSUPP;
-
- if (ca_keyid && !asymmetric_key_id_partial(cert->akid_skid, ca_keyid))
- return -EPERM;
-
- key = x509_request_asymmetric_key(trust_keyring,
- cert->akid_id, cert->akid_skid,
- false);
- if (!IS_ERR(key)) {
- if (!use_builtin_keys
- || test_bit(KEY_FLAG_BUILTIN, &key->flags))
- ret = x509_check_signature(key->payload.data[asym_crypto],
- cert);
- key_put(key);
+ ret = public_key_verify_signature(cert->pub, cert->sig);
+ if (ret < 0) {
+ if (ret == -ENOPKG) {
+ cert->unsupported_sig = true;
+ ret = 0;
+ }
+ goto out;
}
+
+ pr_devel("Cert Self-signature verified");
+ cert->self_signed = true;
+
+out:
+ pr_devel("<==%s() = %d\n", __func__, ret);
return ret;
+
+not_self_signed:
+ pr_devel("<==%s() = 0 [not]\n", __func__);
+ return 0;
}
/*
@@ -291,34 +168,22 @@ static int x509_key_preparse(struct key_preparsed_payload *prep)
pr_devel("Cert Issuer: %s\n", cert->issuer);
pr_devel("Cert Subject: %s\n", cert->subject);
- if (!cert->pub->pkey_algo ||
- !cert->sig.pkey_algo ||
- !cert->sig.hash_algo) {
+ if (cert->unsupported_key) {
ret = -ENOPKG;
goto error_free_cert;
}
pr_devel("Cert Key Algo: %s\n", cert->pub->pkey_algo);
pr_devel("Cert Valid period: %lld-%lld\n", cert->valid_from, cert->valid_to);
- pr_devel("Cert Signature: %s + %s\n",
- cert->sig.pkey_algo,
- cert->sig.hash_algo);
cert->pub->id_type = "X509";
- /* Check the signature on the key if it appears to be self-signed */
- if ((!cert->akid_skid && !cert->akid_id) ||
- asymmetric_key_id_same(cert->skid, cert->akid_skid) ||
- asymmetric_key_id_same(cert->id, cert->akid_id)) {
- ret = x509_check_signature(cert->pub, cert); /* self-signed */
- if (ret < 0)
- goto error_free_cert;
- } else if (!prep->trusted) {
- ret = x509_validate_trust(cert, get_system_trusted_keyring());
- if (ret)
- ret = x509_validate_trust(cert, get_ima_mok_keyring());
- if (!ret)
- prep->trusted = 1;
+ if (cert->unsupported_sig) {
+ public_key_signature_free(cert->sig);
+ cert->sig = NULL;
+ } else {
+ pr_devel("Cert Signature: %s + %s\n",
+ cert->sig->pkey_algo, cert->sig->hash_algo);
}
/* Propose a description */
@@ -353,6 +218,7 @@ static int x509_key_preparse(struct key_preparsed_payload *prep)
prep->payload.data[asym_subtype] = &public_key_subtype;
prep->payload.data[asym_key_ids] = kids;
prep->payload.data[asym_crypto] = cert->pub;
+ prep->payload.data[asym_auth] = cert->sig;
prep->description = desc;
prep->quotalen = 100;
@@ -360,6 +226,7 @@ static int x509_key_preparse(struct key_preparsed_payload *prep)
cert->pub = NULL;
cert->id = NULL;
cert->skid = NULL;
+ cert->sig = NULL;
desc = NULL;
ret = 0;
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-16 18:12:57 +0000