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authorDavid Howells <dhowells@redhat.com>2012-09-26 10:11:06 +0100
committerRusty Russell <rusty@rustcorp.com.au>2012-10-10 20:06:33 +1030
commit85ecac79457e30b19802bbfaeba1856ad00945b0 (patch)
treeed25c82266200041e017b388c693036852ec1c7d /scripts/Makefile.modpost
parent48ba2462ace6072741fd8d0058207d630ce93bf1 (diff)
downloadlinux-85ecac79457e30b19802bbfaeba1856ad00945b0.tar.bz2
MODSIGN: Provide a script for generating a key ID from an X.509 cert
Provide a script to parse an X.509 certificate and certain pieces of information from it in order to generate a key identifier to be included within a module signature. The script takes the Subject Name and extracts (if present) the organizationName (O), the commonName (CN) and the emailAddress and fabricates the signer's name from them: (1) If both O and CN exist, then the name will be "O: CN", unless: (a) CN is prefixed by O, in which case only CN is used. (b) CN and O share at least the first 7 characters, in which case only CN is used. (2) Otherwise, CN is used if present. (3) Otherwise, O is used if present. (4) Otherwise the emailAddress is used, if present. (5) Otherwise a blank name is used. The script emits a binary encoded identifier in the following form: - 2 BE bytes indicating the length of the signer's name. - 2 BE bytes indicating the length of the subject key identifier. - The characters of the signer's name. - The bytes of the subject key identifier. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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