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| author | Dmitry Kasatkin <d.kasatkin@samsung.com> | 2014-06-17 11:56:58 +0300 |
|---|---|---|
| committer | Mimi Zohar <zohar@linux.vnet.ibm.com> | 2014-07-17 09:35:16 -0400 |
| commit | ffb70f61bab1482a3bd0f85fd8f1e9c9909df2ca (patch) | |
| tree | f25c90a65af6441434dd70dcaacb7d204b6ea00b /crypto/asymmetric_keys | |
| parent | b3426827c848d252ed4ca5f4d3085551be083e12 (diff) | |
| download | lwn-ffb70f61bab1482a3bd0f85fd8f1e9c9909df2ca.tar.gz lwn-ffb70f61bab1482a3bd0f85fd8f1e9c9909df2ca.zip | |
KEYS: validate certificate trust only with selected key
Instead of allowing public keys, with certificates signed by any
key on the system trusted keyring, to be added to a trusted keyring,
this patch further restricts the certificates to those signed by a
particular key on the system keyring.
This patch defines a new kernel parameter 'ca_keys' to identify the
specific key which must be used for trust validation of certificates.
Simplified Mimi's "KEYS: define an owner trusted keyring" patch.
Changelog:
- support for builtin x509 public keys only
- export "asymmetric_keyid_match"
- remove ifndefs MODULE
- rename kernel boot parameter from keys_ownerid to ca_keys
Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Diffstat (limited to 'crypto/asymmetric_keys')
| -rw-r--r-- | crypto/asymmetric_keys/asymmetric_type.c | 1 | ||||
| -rw-r--r-- | crypto/asymmetric_keys/x509_public_key.c | 19 |
2 files changed, 20 insertions, 0 deletions
diff --git a/crypto/asymmetric_keys/asymmetric_type.c b/crypto/asymmetric_keys/asymmetric_type.c index 1fd1d304a15a..c948df5c4ecd 100644 --- a/crypto/asymmetric_keys/asymmetric_type.c +++ b/crypto/asymmetric_keys/asymmetric_type.c @@ -49,6 +49,7 @@ int asymmetric_keyid_match(const char *kid, const char *id) return 1; } +EXPORT_SYMBOL_GPL(asymmetric_keyid_match); /* * Match asymmetric keys on (part of) their name diff --git a/crypto/asymmetric_keys/x509_public_key.c b/crypto/asymmetric_keys/x509_public_key.c index 436fbd8552fc..d376195e1d08 100644 --- a/crypto/asymmetric_keys/x509_public_key.c +++ b/crypto/asymmetric_keys/x509_public_key.c @@ -24,6 +24,22 @@ #include "public_key.h" #include "x509_parser.h" +static char *ca_keyid; + +#ifndef MODULE +static int __init ca_keys_setup(char *str) +{ + if (!str) /* default system keyring */ + return 1; + + if (strncmp(str, "id:", 3) == 0) + ca_keyid = str; /* owner key 'id:xxxxxx' */ + + return 1; +} +__setup("ca_keys=", ca_keys_setup); +#endif + /* * Find a key in the given keyring by issuer and authority. */ @@ -171,6 +187,9 @@ static int x509_validate_trust(struct x509_certificate *cert, if (!trust_keyring) return -EOPNOTSUPP; + if (ca_keyid && !asymmetric_keyid_match(cert->authority, ca_keyid)) + return -EPERM; + key = x509_request_asymmetric_key(trust_keyring, cert->issuer, strlen(cert->issuer), cert->authority, |