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author | David Howells <dhowells@redhat.com> | 2012-09-26 10:11:03 +0100 |
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committer | Rusty Russell <rusty@rustcorp.com.au> | 2012-10-10 20:06:10 +1030 |
commit | 48ba2462ace6072741fd8d0058207d630ce93bf1 (patch) | |
tree | 3cea7661a3bd5d03631e01171c19f2123346cf01 /kernel | |
parent | 631cc66eb9eaa7296e303197ff1eb0f55e32b61d (diff) | |
download | linux-stable-48ba2462ace6072741fd8d0058207d630ce93bf1.tar.gz linux-stable-48ba2462ace6072741fd8d0058207d630ce93bf1.tar.bz2 linux-stable-48ba2462ace6072741fd8d0058207d630ce93bf1.zip |
MODSIGN: Implement module signature checking
Check the signature on the module against the keys compiled into the kernel or
available in a hardware key store.
Currently, only RSA keys are supported - though that's easy enough to change,
and the signature is expected to contain raw components (so not a PGP or
PKCS#7 formatted blob).
The signature blob is expected to consist of the following pieces in order:
(1) The binary identifier for the key. This is expected to match the
SubjectKeyIdentifier from an X.509 certificate. Only X.509 type
identifiers are currently supported.
(2) The signature data, consisting of a series of MPIs in which each is in
the format of a 2-byte BE word sizes followed by the content data.
(3) A 12 byte information block of the form:
struct module_signature {
enum pkey_algo algo : 8;
enum pkey_hash_algo hash : 8;
enum pkey_id_type id_type : 8;
u8 __pad;
__be32 id_length;
__be32 sig_length;
};
The three enums are defined in crypto/public_key.h.
'algo' contains the public-key algorithm identifier (0->DSA, 1->RSA).
'hash' contains the digest algorithm identifier (0->MD4, 1->MD5, 2->SHA1,
etc.).
'id_type' contains the public-key identifier type (0->PGP, 1->X.509).
'__pad' should be 0.
'id_length' should contain in the binary identifier length in BE form.
'sig_length' should contain in the signature data length in BE form.
The lengths are in BE order rather than CPU order to make dealing with
cross-compilation easier.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (minor Kconfig fix)
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/module_signing.c | 222 |
1 files changed, 221 insertions, 1 deletions
diff --git a/kernel/module_signing.c b/kernel/module_signing.c index 499728aecafb..6b09f6983ac0 100644 --- a/kernel/module_signing.c +++ b/kernel/module_signing.c @@ -11,13 +11,233 @@ #include <linux/kernel.h> #include <linux/err.h> +#include <crypto/public_key.h> +#include <crypto/hash.h> +#include <keys/asymmetric-type.h> #include "module-internal.h" /* + * Module signature information block. + * + * The constituents of the signature section are, in order: + * + * - Signer's name + * - Key identifier + * - Signature data + * - Information block + */ +struct module_signature { + enum pkey_algo algo : 8; /* Public-key crypto algorithm */ + enum pkey_hash_algo hash : 8; /* Digest algorithm */ + enum pkey_id_type id_type : 8; /* Key identifier type */ + u8 signer_len; /* Length of signer's name */ + u8 key_id_len; /* Length of key identifier */ + u8 __pad[3]; + __be32 sig_len; /* Length of signature data */ +}; + +/* + * Digest the module contents. + */ +static struct public_key_signature *mod_make_digest(enum pkey_hash_algo hash, + const void *mod, + unsigned long modlen) +{ + struct public_key_signature *pks; + struct crypto_shash *tfm; + struct shash_desc *desc; + size_t digest_size, desc_size; + int ret; + + pr_devel("==>%s()\n", __func__); + + /* Allocate the hashing algorithm we're going to need and find out how + * big the hash operational data will be. + */ + tfm = crypto_alloc_shash(pkey_hash_algo[hash], 0, 0); + if (IS_ERR(tfm)) + return (PTR_ERR(tfm) == -ENOENT) ? ERR_PTR(-ENOPKG) : ERR_CAST(tfm); + + desc_size = crypto_shash_descsize(tfm) + sizeof(*desc); + digest_size = crypto_shash_digestsize(tfm); + + /* We allocate the hash operational data storage on the end of our + * context data and the digest output buffer on the end of that. + */ + ret = -ENOMEM; + pks = kzalloc(digest_size + sizeof(*pks) + desc_size, GFP_KERNEL); + if (!pks) + goto error_no_pks; + + pks->pkey_hash_algo = hash; + pks->digest = (u8 *)pks + sizeof(*pks) + desc_size; + pks->digest_size = digest_size; + + desc = (void *)pks + sizeof(*pks); + desc->tfm = tfm; + desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; + + ret = crypto_shash_init(desc); + if (ret < 0) + goto error; + + ret = crypto_shash_finup(desc, mod, modlen, pks->digest); + if (ret < 0) + goto error; + + crypto_free_shash(tfm); + pr_devel("<==%s() = ok\n", __func__); + return pks; + +error: + kfree(pks); +error_no_pks: + crypto_free_shash(tfm); + pr_devel("<==%s() = %d\n", __func__, ret); + return ERR_PTR(ret); +} + +/* + * Extract an MPI array from the signature data. This represents the actual + * signature. Each raw MPI is prefaced by a BE 2-byte value indicating the + * size of the MPI in bytes. + * + * RSA signatures only have one MPI, so currently we only read one. + */ +static int mod_extract_mpi_array(struct public_key_signature *pks, + const void *data, size_t len) +{ + size_t nbytes; + MPI mpi; + + if (len < 3) + return -EBADMSG; + nbytes = ((const u8 *)data)[0] << 8 | ((const u8 *)data)[1]; + data += 2; + len -= 2; + if (len != nbytes) + return -EBADMSG; + + mpi = mpi_read_raw_data(data, nbytes); + if (!mpi) + return -ENOMEM; + pks->mpi[0] = mpi; + pks->nr_mpi = 1; + return 0; +} + +/* + * Request an asymmetric key. + */ +static struct key *request_asymmetric_key(const char *signer, size_t signer_len, + const u8 *key_id, size_t key_id_len) +{ + key_ref_t key; + size_t i; + char *id, *q; + + pr_devel("==>%s(,%zu,,%zu)\n", __func__, signer_len, key_id_len); + + /* Construct an identifier. */ + id = kmalloc(signer_len + 2 + key_id_len * 2 + 1, GFP_KERNEL); + if (!id) + return ERR_PTR(-ENOKEY); + + memcpy(id, signer, signer_len); + + q = id + signer_len; + *q++ = ':'; + *q++ = ' '; + for (i = 0; i < key_id_len; i++) { + *q++ = hex_asc[*key_id >> 4]; + *q++ = hex_asc[*key_id++ & 0x0f]; + } + + *q = 0; + + pr_debug("Look up: \"%s\"\n", id); + + key = keyring_search(make_key_ref(modsign_keyring, 1), + &key_type_asymmetric, id); + if (IS_ERR(key)) + pr_warn("Request for unknown module key '%s' err %ld\n", + id, PTR_ERR(key)); + kfree(id); + + if (IS_ERR(key)) { + switch (PTR_ERR(key)) { + /* Hide some search errors */ + case -EACCES: + case -ENOTDIR: + case -EAGAIN: + return ERR_PTR(-ENOKEY); + default: + return ERR_CAST(key); + } + } + + pr_devel("<==%s() = 0 [%x]\n", __func__, key_serial(key_ref_to_ptr(key))); + return key_ref_to_ptr(key); +} + +/* * Verify the signature on a module. */ int mod_verify_sig(const void *mod, unsigned long modlen, const void *sig, unsigned long siglen) { - return -ENOKEY; + struct public_key_signature *pks; + struct module_signature ms; + struct key *key; + size_t sig_len; + int ret; + + pr_devel("==>%s(,%lu,,%lu,)\n", __func__, modlen, siglen); + + if (siglen <= sizeof(ms)) + return -EBADMSG; + + memcpy(&ms, sig + (siglen - sizeof(ms)), sizeof(ms)); + siglen -= sizeof(ms); + + sig_len = be32_to_cpu(ms.sig_len); + if (sig_len >= siglen || + siglen - sig_len != (size_t)ms.signer_len + ms.key_id_len) + return -EBADMSG; + + /* For the moment, only support RSA and X.509 identifiers */ + if (ms.algo != PKEY_ALGO_RSA || + ms.id_type != PKEY_ID_X509) + return -ENOPKG; + + if (ms.hash >= PKEY_HASH__LAST || + !pkey_hash_algo[ms.hash]) + return -ENOPKG; + + key = request_asymmetric_key(sig, ms.signer_len, + sig + ms.signer_len, ms.key_id_len); + if (IS_ERR(key)) + return PTR_ERR(key); + + pks = mod_make_digest(ms.hash, mod, modlen); + if (IS_ERR(pks)) { + ret = PTR_ERR(pks); + goto error_put_key; + } + + ret = mod_extract_mpi_array(pks, sig + ms.signer_len + ms.key_id_len, + sig_len); + if (ret < 0) + goto error_free_pks; + + ret = verify_signature(key, pks); + pr_devel("verify_signature() = %d\n", ret); + +error_free_pks: + mpi_free(pks->rsa.s); + kfree(pks); +error_put_key: + key_put(key); + pr_devel("<==%s() = %d\n", __func__, ret); + return ret; } |