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CryptoPkg: Add new API to retrieve commonName of X.509 certificate

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v3: Add extra CommonNameSize check since OpenSSL didn't check this
    input parameter. (One openssl issue was filed to address this risk:
    https://github.com/openssl/openssl/issues/4392)
v2: Update function interface to return RETURN_STATUS to represent
    different error cases.

Add one new API (X509GetCommonName()) to retrieve the subject commonName
string from one X.509 certificate.

Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Ting Ye <ting.ye@intel.com>
Cc: Chao Zhang <chao.b.zhang@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Qin Long <qin.long@intel.com>
Reviewed-by: Ye Ting <ting.ye@intel.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
This commit is contained in:
Qin Long
2017-09-24 23:42:16 +08:00
parent fc8be1ad9a
commit 5b7c224505
5 changed files with 234 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

109
CryptoPkg/Library/BaseCryptLib/Pk/CryptX509.c
View File

@@ -297,6 +297,115 @@ _Exit:
return Status;
}
/**
Retrieve the common name (CN) string from one X.509 certificate.
@param[in] Cert Pointer to the DER-encoded X509 certificate.
@param[in] CertSize Size of the X509 certificate in bytes.
@param[out] CommonName Buffer to contain the retrieved certificate common
name string. At most CommonNameSize bytes will be
written and the string will be null terminated. May be
NULL in order to determine the size buffer needed.
@param[in,out] CommonNameSize The size in bytes of the CommonName buffer on input,
and the size of buffer returned CommonName on output.
If CommonName is NULL then the amount of space needed
in buffer (including the final null) is returned.
@retval RETURN_SUCCESS The certificate CommonName retrieved successfully.
@retval RETURN_INVALID_PARAMETER If Cert is NULL.
If CommonNameSize is NULL.
If CommonName is not NULL and *CommonNameSize is 0.
If Certificate is invalid.
@retval RETURN_NOT_FOUND If no CommonName entry exists.
@retval RETURN_BUFFER_TOO_SMALL If the CommonName is NULL. The required buffer size
(including the final null) is returned in the
CommonNameSize parameter.
@retval RETURN_UNSUPPORTED The operation is not supported.
**/
RETURN_STATUS
EFIAPI
X509GetCommonName (
IN CONST UINT8 *Cert,
IN UINTN CertSize,
OUT CHAR8 *CommonName, OPTIONAL
IN OUT UINTN *CommonNameSize
)
{
RETURN_STATUS ReturnStatus;
BOOLEAN Status;
X509 *X509Cert;
X509_NAME *X509Name;
INTN Length;
ReturnStatus = RETURN_INVALID_PARAMETER;
//
// Check input parameters.
//
if ((Cert == NULL) || (CertSize > INT_MAX) || (CommonNameSize == NULL)) {
return ReturnStatus;
}
if ((CommonName != NULL) && (*CommonNameSize == 0)) {
return ReturnStatus;
}
X509Cert = NULL;
//
// Read DER-encoded X509 Certificate and Construct X509 object.
//
Status = X509ConstructCertificate (Cert, CertSize, (UINT8 **) &X509Cert);
if ((X509Cert == NULL) || (!Status)) {
//
// Invalid X.509 Certificate
//
goto _Exit;
}
Status = FALSE;
//
// Retrieve subject name from certificate object.
//
X509Name = X509_get_subject_name (X509Cert);
if (X509Name == NULL) {
//
// Fail to retrieve subject name content
//
goto _Exit;
}
//
// Retrieve the CommonName information from X.509 Subject
//
Length = (INTN) X509_NAME_get_text_by_NID (X509Name, NID_commonName, CommonName, (int)(*CommonNameSize));
if (Length < 0) {
//
// No CommonName entry exists in X509_NAME object
//
*CommonNameSize = 0;
ReturnStatus = RETURN_NOT_FOUND;
goto _Exit;
}
*CommonNameSize = (UINTN)(Length + 1);
if (CommonName == NULL) {
ReturnStatus = RETURN_BUFFER_TOO_SMALL;
} else {
ReturnStatus = RETURN_SUCCESS;
}
_Exit:
//
// Release Resources.
//
if (X509Cert != NULL) {
X509_free (X509Cert);
}
return ReturnStatus;
}
/**
Retrieve the RSA Public Key from one DER-encoded X509 certificate.