diff options
author | David Howells <dhowells@redhat.com> | 2012-10-02 13:36:16 (GMT) |
---|---|---|
committer | Rusty Russell <rusty@rustcorp.com.au> | 2012-10-10 09:36:37 (GMT) |
commit | a5752d11b3853fcdb48b303573dd39b09d05e500 (patch) | |
tree | fdbf54986ce97f473661d62510a513bb4ba79aa9 /crypto/asymmetric_keys/x509_public_key.c | |
parent | d5b719365ec13ef825f2548ba54903b9d029238c (diff) | |
download | linux-fsl-qoriq-a5752d11b3853fcdb48b303573dd39b09d05e500.tar.xz |
MODSIGN: Fix 32-bit overflow in X.509 certificate validity date checking
The current choice of lifetime for the autogenerated X.509 of 100 years,
putting the validTo date in 2112, causes problems on 32-bit systems where a
32-bit time_t wraps in 2106. 64-bit x86_64 systems seem to be unaffected.
This can result in something like:
Loading module verification certificates
X.509: Cert 6e03943da0f3b015ba6ed7f5e0cac4fe48680994 has expired
MODSIGN: Problem loading in-kernel X.509 certificate (-127)
Or:
X.509: Cert 6e03943da0f3b015ba6ed7f5e0cac4fe48680994 is not yet valid
MODSIGN: Problem loading in-kernel X.509 certificate (-129)
Instead of turning the dates into time_t values and comparing, turn the system
clock and the ASN.1 dates into tm structs and compare those piecemeal instead.
Reported-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Josh Boyer <jwboyer@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'crypto/asymmetric_keys/x509_public_key.c')
-rw-r--r-- | crypto/asymmetric_keys/x509_public_key.c | 42 |
1 files changed, 37 insertions, 5 deletions
diff --git a/crypto/asymmetric_keys/x509_public_key.c b/crypto/asymmetric_keys/x509_public_key.c index 716917c..5ab736d 100644 --- a/crypto/asymmetric_keys/x509_public_key.c +++ b/crypto/asymmetric_keys/x509_public_key.c @@ -106,7 +106,7 @@ error_no_sig: static int x509_key_preparse(struct key_preparsed_payload *prep) { struct x509_certificate *cert; - time_t now; + struct tm now; size_t srlen, sulen; char *desc = NULL; int ret; @@ -118,7 +118,14 @@ 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); pr_devel("Cert Key Algo: %s\n", pkey_algo[cert->pkey_algo]); - pr_devel("Cert Valid: %lu - %lu\n", cert->valid_from, cert->valid_to); + printk("Cert Valid From: %04ld-%02d-%02d %02d:%02d:%02d\n", + cert->valid_from.tm_year + 1900, cert->valid_from.tm_mon + 1, + cert->valid_from.tm_mday, cert->valid_from.tm_hour, + cert->valid_from.tm_min, cert->valid_from.tm_sec); + printk("Cert Valid To: %04ld-%02d-%02d %02d:%02d:%02d\n", + cert->valid_to.tm_year + 1900, cert->valid_to.tm_mon + 1, + cert->valid_to.tm_mday, cert->valid_to.tm_hour, + cert->valid_to.tm_min, cert->valid_to.tm_sec); pr_devel("Cert Signature: %s + %s\n", pkey_algo[cert->sig_pkey_algo], pkey_hash_algo[cert->sig_hash_algo]); @@ -130,13 +137,38 @@ static int x509_key_preparse(struct key_preparsed_payload *prep) goto error_free_cert; } - now = CURRENT_TIME.tv_sec; - if (now < cert->valid_from) { + time_to_tm(CURRENT_TIME.tv_sec, 0, &now); + printk("Now: %04ld-%02d-%02d %02d:%02d:%02d\n", + now.tm_year + 1900, now.tm_mon + 1, now.tm_mday, + now.tm_hour, now.tm_min, now.tm_sec); + if (now.tm_year < cert->valid_from.tm_year || + (now.tm_year == cert->valid_from.tm_year && + (now.tm_mon < cert->valid_from.tm_mon || + (now.tm_mon == cert->valid_from.tm_mon && + (now.tm_mday < cert->valid_from.tm_mday || + (now.tm_mday == cert->valid_from.tm_mday && + (now.tm_hour < cert->valid_from.tm_hour || + (now.tm_hour == cert->valid_from.tm_hour && + (now.tm_min < cert->valid_from.tm_min || + (now.tm_min == cert->valid_from.tm_min && + (now.tm_sec < cert->valid_from.tm_sec + ))))))))))) { pr_warn("Cert %s is not yet valid\n", cert->fingerprint); ret = -EKEYREJECTED; goto error_free_cert; } - if (now >= cert->valid_to) { + if (now.tm_year > cert->valid_to.tm_year || + (now.tm_year == cert->valid_to.tm_year && + (now.tm_mon > cert->valid_to.tm_mon || + (now.tm_mon == cert->valid_to.tm_mon && + (now.tm_mday > cert->valid_to.tm_mday || + (now.tm_mday == cert->valid_to.tm_mday && + (now.tm_hour > cert->valid_to.tm_hour || + (now.tm_hour == cert->valid_to.tm_hour && + (now.tm_min > cert->valid_to.tm_min || + (now.tm_min == cert->valid_to.tm_min && + (now.tm_sec > cert->valid_to.tm_sec + ))))))))))) { pr_warn("Cert %s has expired\n", cert->fingerprint); ret = -EKEYEXPIRED; goto error_free_cert; |