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Code Issues Releases Wiki Activity

check that the installed certificate corresponds to the private key

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This commit is contained in:
Joshua Tauberer 2014-07-08 15:47:54 +00:00
parent 10fbb2b293
commit 04e30ffa78
2 changed files with 24 additions and 3 deletions
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2
management/buy_certificate.py
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@ -108,7 +108,7 @@ def buy_ssl_certificate(api_key, domain, command, env):
# Check before we overwrite something we shouldn't. # Check before we overwrite something we shouldn't.
if os.path.exists(ssl_certificate): if os.path.exists(ssl_certificate):
cert_status = check_certificate(None, ssl_certificate) cert_status = check_certificate(None, ssl_certificate, None)
if cert_status != "SELF-SIGNED": if cert_status != "SELF-SIGNED":
print("Please back up and delete the file %s so I can save your new certificate." % ssl_certificate) print("Please back up and delete the file %s so I can save your new certificate." % ssl_certificate)
sys.exit(1) sys.exit(1)

25
management/whats_next.py
View File

@ -223,7 +223,7 @@ def check_ssl_cert(domain, env):
# Check that the certificate is good. # Check that the certificate is good.
cert_status = check_certificate(domain, ssl_certificate) cert_status = check_certificate(domain, ssl_certificate, ssl_key)
if cert_status == "SELF-SIGNED": if cert_status == "SELF-SIGNED":
fingerprint = shell('check_output', [ fingerprint = shell('check_output', [
@ -265,7 +265,7 @@ def check_ssl_cert(domain, env):
print(cert_status) print(cert_status)
print("") print("")
def check_certificate(domain ,ssl_certificate): def check_certificate(domain, ssl_certificate, ssl_private_key):
# Use openssl verify to check the status of a certificate. # Use openssl verify to check the status of a certificate.
# First check that the certificate is for the right domain. The domain # First check that the certificate is for the right domain. The domain
@ -303,6 +303,27 @@ def check_certificate(domain ,ssl_certificate):
return "This certificate is for the wrong domain names. It is for %s." % \ return "This certificate is for the wrong domain names. It is for %s." % \
", ".join(sorted(certificate_names)) ", ".join(sorted(certificate_names))
# Second, check that the certificate matches the private key. Get the modulus of the
# private key and of the public key in the certificate. They should match. The output
# of each command looks like "Modulus=XXXXX".
if ssl_private_key is not None:
private_key_modulus = shell('check_output', [
"openssl", "rsa",
"-inform", "PEM",
"-noout", "-modulus",
"-in", ssl_private_key])
cert_key_modulus = shell('check_output', [
"openssl", "x509",
"-in", ssl_certificate,
"-noout", "-modulus"])
if private_key_modulus != cert_key_modulus:
return "The certificate installed at %s does not correspond to the private key at %s." % (ssl_certificate, ssl_private_key)
# Next validate that the certificate is valid. This checks whether the certificate
# is self-signed, that the chain of trust makes sense, that it is signed by a CA
# that Ubuntu has installed on this machine's list of CAs, and I think that it hasn't
# expired.
# In order to verify with openssl, we need to split out any # In order to verify with openssl, we need to split out any
# intermediary certificates in the chain (if any) from our # intermediary certificates in the chain (if any) from our
# certificate (at the top). They need to be passed separately. # certificate (at the top). They need to be passed separately.