Since Mbed TLS 4.0, this is just the low-level error code. But keep the
combination for uniformity with the rest of the file, and to reduce the
differences with the 3.6 branch.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
In an X.509 certificate, a basicConstraints extension where the cA
field (BOOLEAN) is omitted but the pathLenConstraint field (INTEGER )is
present is syntactically valid, but RFC 5280 states that CAs MUST NOT emit
such a certificate.
Historically, since XySSL 0.9 in 2008, if a basicConstraints extension
started with an INTEGER field, we interpreted that field as a cA value. This
was a deliberate change:
> Fixed x509_get_ext() to accept some rare certificates (like
> www.openssl.org:443) which have an INTEGER instead of a BOOLEAN for
> Extension::BasicConstraints::cA.
However, 18 years later, this does not seem to be relevant, and the details
seem to have been lost. Furthermore, major implementations follow RFC 5280
and interpret `SEQUENCE { INTEGER n }` with cA being set to its default
value (FALSE) and pathLenConstraint set to `n`. This means that such a
certificate with n != 0 would be interpreted as a CA certificate in Mbed TLS
but as a leaf certificate elsewhere, which is dangerous.
Since CAs are not supposed to emit such certificates, stop accepting them
altogether.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
In test cases for pathLenConstraint parsing in a basicConstraints extension
of an X.509 certificate, use the standard type for the leading cA field,
namely BOOLEAN. The test data was encoding that field as INTEGER, which was
accepted as a deviation from the standard since XySSL 0.9.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Don't allow parts of a compound (SEQUENCE or SET) to go beyond the
containing compound.
The inline CSR regression test is derived from the existing "X509 CSR
ASN.1 (OK)" DER test vector. In the extensionRequest attribute, the original
well-formed fragment is:
a029 3027 06092a864886f70d01090e 311a 3018 ...
where 31 1a is the SET containing the Extensions sequence and 30 18 is the
contained Extensions sequence. The malformed test changes only the SET
length byte, from 1a to 19:
a029 3027 06092a864886f70d01090e 3119 3018 ...
The attribute SEQUENCE length and the inner Extensions sequence length are
left unchanged. This makes the SET one byte too short for its containing
attribute, so the parser must reject it with
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH instead of parsing the trailing byte as
data outside the SET.
There is no known security impact, just some risk reduction.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
When parsing the basicConstraints extension, reject junk after the SEQUENCE
inside the extension (which is probably benign), and reject a SEQUENCE that
extends beyond the extension (could be very dangerous).
Add a non-regression test where a certificate that is technically malformed,
but accepted as a leaf certificate by OpenSSL and other X.509
implementations, to be accepted as a CA certificate by Mbed TLS.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This replacement is either:
- "server5-rsa-signed.crt": if a generic secp256r1 EC key is enough, i.e.
any EC key is fine as it's not secp192 since this support is being
removed from TF-PSA-Crypto.
- "server11-rsa-signed.crt": if an EC key which does not belong to "suite-b"
is required. For this case "secp256r1" wouldn't be good, so we use
a "secp256k1" key.
Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
After some analysis search it was determined that previous test data seem
not to belong to the "framework/data_files" certificate files. Therefore
new test data has been generated from scratch.
The improvement compared to the previous situation is that comments has
been added on top of each test in order to explain how to recreate new test
data.
Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
The previous key was not correct so it could not be imported into PSA
for validation inside the PK module.
Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
Replace the non-X.509-named error code `MBEDTLS_ERR_OID_NOT_FOUND` with
`MBEDTLS_ERR_X509_UNKNOWN_OID`, which already exists and is currently not
used for anything.
Public functions in X.509 propagate this error code, so it needs to have a
public name.
Remove the definition of `MBEDTLS_ERR_OID_NOT_FOUND` in `x509_oid.h`, then
```
git grep -l MBEDTLS_ERR_OID_NOT_FOUND | xargs perl -i -pe 's/\bMBEDTLS_ERR_OID_NOT_FOUND\b/MBEDTLS_ERR_X509_UNKNOWN_OID/g'
```
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Parsing of CRT files with message's hash alg different from the MGF1 was
allowed in the past, but now it fails. So we need to move/adapt tests
relying on this feature, from a "verify" scope to a "parse" one.
Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
Replace obvious additions of an `MBEDTLS_ERR_xxx` constant by a call to
`MBEDTLS_ERROR_ADD`.
Skip `case` statements since `MBEDTLS_ERROR_ADD(pp_constant)` is not a
preprocessor constant.
This commit does not replace additions split over lines. Those will be
handled in a subsequent commit.
```
git ls-files '*.h' '*.c' '*.function' '*.data' |
xargs perl -i -pe '
next if /\bcase\b/;
s/\b(MBEDTLS_ERR_\w+)\s*\+\s*(\w+)\b/MBEDTLS_ERROR_ADD($1, $2)/g;
s/\b(\w+)\s*\+\s*(MBEDTLS_ERR_\w+)\b/MBEDTLS_ERROR_ADD($1, $2)/g'
```
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit moves all related mbedtls_oid_get_numeric_string unit tests
from test_suite_oid to test_suite_x509parse.
Signed-off-by: Sam Berry <sam.berry@arm.com>
This helps in reverting the changes to test_suite_x509parse.data
when the RSA key parsing fails.
Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
The goal is to remove usage of PK return values in order to
completely eliminate that dependency.
This commit also updates pkparse and test_suite_x509parse to
align with this change in return values.
Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
