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Simon J. Gerraty
9ca2cfeb4e
For 2027 we need to support new, stronger signatures and hashes. Re-work Makefile.inc and local.trust.mk to define VE_SIGN_URL_LIST or VE_SIGNATURE_LIST (can be derrived from VE_SIGN_URL_LIST) containing tuples of sig/method/hash/flags and for VE_SIGN_URL_LIST the same plus /url. From VE_SIGNATURE_LIST we derrive VE_SIGNATURE_EXT_LIST used to populate signature_ext_list which defines the order in which we look for signatures for a manifest. We also populate signature_info_list which maps a signature ext to the needed hash and flags to indicate whether that hash needs to be repeated. verify_sig will lookup signature_info_list, no match means not supported. For asc we just call verify_asc() otherwise we call verify_ec() or verify_rsa() depending on the key type found in the certificate chain, we pass the signature_info entry to these so they know which hash to use and whether to repeat it. The need to repeat the hash is a consequence of sending a hash to a server using signature methods that insiste on hashing their input. To-date only our original ECDSA signatures use this. A FakeHash class added in 2012 avoids that wrinkle. This is a much more flexible arrangement and should be more readily usable by others. Sponsored by: Hewlett Packard Enterprise Development LP. Reviewed by: imp Differential Revision: https://reviews.freebsd.org/D61007
56 lines
2.0 KiB
C
56 lines
2.0 KiB
C
/*-
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* Copyright (c) 2018, Juniper Networks, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <libsecureboot.h>
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#include <vse.h>
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/**
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* @brief
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* verify signed file
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*
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* We look for a signature using the extensions
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* recorded in signature_exts.
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* If we find a match we pass it to a suitable verify method.
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*
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* @return content of verified file or NULL on error.
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*/
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unsigned char *
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verify_signed(const char *filename, int flags)
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{
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struct stat st;
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char buf[MAXPATHLEN];
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const char **se;
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for (se = signature_ext_list; *se; se++) {
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snprintf(buf, sizeof(buf), "%s.%s", filename, *se);
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if (stat(buf, &st) < 0 || !S_ISREG(st.st_mode))
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continue;
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DEBUG_PRINTF(5, ("verify_signed: %s\n", buf));
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return (verify_sig(buf, flags));
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}
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return (NULL);
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}
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