mbedtls: add support for pkcs7

PKCS7 signing format is used by OpenPOWER Key Management, which is
using mbedtls as its crypto library.

This patch adds the limited support of pkcs7 parser and verification
to the mbedtls. The limitations are:

* Only signed data is supported.
* CRLs are not currently handled.
* Single signer is supported.

Signed-off-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Eric Richter <erichte@linux.ibm.com>
Signed-off-by: Nayna Jain <nayna@linux.ibm.com>

1 files changed, 92 insertions, 0 deletions

diff --git a/tests/data_files/Makefile b/tests/data_files/Makefile
index 6187d17..288b01f 100644
--- a/tests/data_files/Makefile
+++ b/tests/data_files/Makefile
@@ -1131,6 +1131,98 @@ ecdsa_secp521r1.crt: ecdsa_secp521r1.csr
 all_final += ecdsa_secp521r1.crt ecdsa_secp521r1.key
 tls13_certs: ecdsa_secp521r1.crt ecdsa_secp521r1.key
 
+# PKCS7 test data
+pkcs7_test_cert_1 = pkcs7-rsa-sha256-1.crt
+pkcs7_test_cert_2 = pkcs7-rsa-sha256-2.crt
+pkcs7_test_file = pkcs7_data.txt
+
+# Generate signing cert
+pkcs7-rsa-sha256-1.crt:
+	$(OPENSSL) req -x509 -subj="/C=NL/O=PKCS7/CN=PKCS7 Cert 1" -sha256 -nodes -days 365  -newkey rsa:2048 -keyout pkcs7-rsa-sha256-1.key -out pkcs7-rsa-sha256-1.crt
+	cat pkcs7-rsa-sha256-1.crt pkcs7-rsa-sha256-1.key > pkcs7-rsa-sha256-1.pem
+all_final += pkcs7-rsa-sha256-1.crt
+
+pkcs7-rsa-sha256-2.crt:
+	$(OPENSSL) req -x509 -subj="/C=NL/O=PKCS7/CN=PKCS7 Cert 2" -sha256 -nodes -days 365  -newkey rsa:2048 -keyout pkcs7-rsa-sha256-2.key -out pkcs7-rsa-sha256-2.crt
+	cat pkcs7-rsa-sha256-2.crt pkcs7-rsa-sha256-2.key > pkcs7-rsa-sha256-2.pem
+all_final += pkcs7-rsa-sha256-2.crt
+
+# Generate data file to be signed
+pkcs7_data.txt:
+	echo "Hello" > $@
+	echo 2 >> pkcs7_data_1.txt
+all_final += pkcs7_data.txt
+
+# Generate another data file to check hash mismatch during certificate verification
+pkcs7_data_1.txt: $(pkcs7_test_file)
+	cat $(pkcs7_test_file) > $@
+	echo 2 >> $@
+all_final += pkcs7_data_1.txt
+
+# pkcs7 signature file with CERT
+pkcs7_data_cert_signed_sha256.der: $(pkcs7_test_file) $(pkcs7_test_cert_1)
+	$(OPENSSL) smime -sign -binary -in pkcs7_data.txt -out $@ -md sha256 -signer pkcs7-rsa-sha256-1.pem -noattr -outform DER -out $@
+all_final += pkcs7_data_cert_signed_sha256.der
+
+# pkcs7 signature file with CERT and sha1
+pkcs7_data_cert_signed_sha1.der: $(pkcs7_test_file) $(pkcs7_test_cert_1)
+	$(OPENSSL) smime -sign -binary -in pkcs7_data.txt -out $@ -md sha1 -signer pkcs7-rsa-sha256-1.pem -noattr -outform DER -out $@
+all_final += pkcs7_data_cert_signed_sha1.der
+
+# pkcs7 signature file with CERT and sha512
+pkcs7_data_cert_signed_sha512.der: $(pkcs7_test_file) $(pkcs7_test_cert_1)
+	$(OPENSSL) smime -sign -binary -in pkcs7_data.txt -out $@ -md sha512 -signer pkcs7-rsa-sha256-1.pem -noattr -outform DER -out $@
+all_final += pkcs7_data_cert_signed_sha512.der
+
+# pkcs7 signature file without CERT
+pkcs7_data_without_cert_signed.der: $(pkcs7_test_file) $(pkcs7_test_cert_1)
+	$(OPENSSL) smime -sign -binary -in pkcs7_data.txt -out $@ -md sha256 -signer pkcs7-rsa-sha256-1.pem -nocerts -noattr -outform DER -out $@
+all_final += pkcs7_data_without_cert_signed.der
+
+# pkcs7 signature file with multiple signers
+pkcs7_data_multiple_signed.der: $(pkcs7_test_file) $(pkcs7_test_cert_1) $(pkcs7_test_cert_2)
+	$(OPENSSL) smime -sign -binary -in pkcs7_data.txt -out $@ -md sha256 -signer pkcs7-rsa-sha256-1.pem -signer pkcs7-rsa-sha256-2.pem -nocerts -noattr -outform DER -out $@
+all_final += pkcs7_data_multiple_signed.der
+
+# pkcs7 signature file with multiple certificates
+pkcs7_data_multiple_certs_signed.der: $(pkcs7_test_file) $(pkcs7_test_cert_1) $(pkcs7_test_cert_2)
+	$(OPENSSL) smime -sign -binary -in pkcs7_data.txt -out $@ -md sha256 -signer pkcs7-rsa-sha256-1.pem -signer pkcs7-rsa-sha256-2.pem -noattr -outform DER -out $@
+all_final += pkcs7_data_multiple_certs_signed.der
+
+# pkcs7 signature file with corrupted CERT
+pkcs7_data_signed_badcert.der: pkcs7_data_cert_signed_sha256.der
+	cp pkcs7_data_cert_signed_sha256.der $@
+	echo -en '\xa1' | dd of=$@ bs=1 seek=547 conv=notrunc
+all_final += pkcs7_data_signed_badcert.der
+
+# pkcs7 signature file with corrupted signer info
+pkcs7_data_signed_badsigner.der: pkcs7_data_cert_signed_sha256.der
+	cp pkcs7_data_cert_signed_sha256.der $@
+	echo -en '\xa1' | dd of=$@ bs=1 seek=918 conv=notrunc
+all_final += pkcs7_data_signed_badsigner.der
+
+# pkcs7 file with version 2
+pkcs7_data_cert_signed_v2.der: pkcs7_data_cert_signed_sha256.der
+	cp pkcs7_data_cert_signed_sha256.der $@
+	echo -en '\x02' | dd of=$@ bs=1 seek=25 conv=notrunc
+all_final += pkcs7_data_cert_signed_v2.der
+
+pkcs7_data_cert_encrypted.der: $(pkcs7_test_file) $(pkcs7_test_cert_1)
+	$(OPENSSL) smime -encrypt -aes256 -in pkcs7_data.txt -binary -outform DER -out $@ pkcs7-rsa-sha256-1.crt
+all_final += pkcs7_data_cert_encrypted.der
+
+## Negative tests
+# For some interesting sizes, what happens if we make them off-by-one?
+pkcs7_signerInfo_issuer_invalid_size.der: pkcs7_data_cert_signed_sha256.der
+	cp $< $@
+	echo -en '\x35' | dd of=$@ seek=919 bs=1 conv=notrunc
+all_final += pkcs7_signerInfo_issuer_invalid_size.der
+
+pkcs7_signerInfo_serial_invalid_size.der: pkcs7_data_cert_signed_sha256.der
+	cp $< $@
+	echo -en '\x15' | dd of=$@ seek=973 bs=1 conv=notrunc
+all_final += pkcs7_signerInfo_serial_invalid_size.der
+
 ################################################################
 #### Diffie-Hellman parameters
 ################################################################