Add the new section for HTTPS Boot.
Changes in v2:
- Fixed the typos
- Added the command for p11-kit based on Laszlo's suggestion
- Also added the efisiglist command
- Elaborated how to create the customized cipher suite list
- Mentioned the changes in QEMU in the future based on Laszlo's
suggestion
Cc: Ard Biesheuvel <[email protected]>
Cc: Jordan Justen <[email protected]>
Cc: Laszlo Ersek <[email protected]>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Gary Lin <[email protected]>
---
OvmfPkg/README | 88 ++++++++++++++++++++
1 file changed, 88 insertions(+)
diff --git a/OvmfPkg/README b/OvmfPkg/README
index 00fb71848200..60545ebccfad 100644
--- a/OvmfPkg/README
+++ b/OvmfPkg/README
@@ -254,6 +254,94 @@ longer.)
VirtioNetDxe | x
Intel BootUtil (X64) | x
+=== HTTPS Boot ===
+
+HTTPS Boot is an alternative solution to PXE. It replaces the tftp server
+with a HTTPS server so the firmware can download the images through a trusted
+and encrypted connection.
+
+* To enable HTTPS Boot, you have to build OVMF with -D HTTP_BOOT_ENABLE and
+ -D TLS_ENABLE. The former brings in the HTTP stack from NetworkPkg while
+ the latter enables TLS support in both NetworkPkg and CryptoPkg.
+
+* By default, there is no trusted certificate. The user has to import the
+ certificates either manually with "Tls Auth Configuration" utility in the
+ firmware UI or through the fw_cfg entry, etc/edk2/https/cacerts.
+
+ -fw_cfg name=etc/edk2/https/cacerts,file=<certdb>
+
+ The blob for etc/edk2/https/cacerts has to be in the format of Signature
+ Database(*1). You can use p11-kit(*2) or efisiglit(*3) to create the
+ certificate list.
+
+ If you want to create the certificate list based on the CA certificates
+ in your local host, p11-kit will be a good choice. Here is the command to
+ create the list:
+
+ p11-kit extract --format=edk2-cacerts --filter=ca-anchors \
+ --overwrite --purpose=server-auth <certdb>
+
+ If you only want to import one certificate, efisiglist is the tool for you:
+
+ efisiglist -a <cert file> -o <certdb>
+
+ Please note that the certificate has to be in the DER format.
+
+ You can also append a certificate to the existed list with the following
+ command:
+
+ efisiglist -i <old certdb> -a <cert file> -o <new certdb>
+
+ NOTE: You may need the patch to make efisiglist generate the correct header.
+ (https://github.com/rhboot/pesign/pull/40)
+
+* Besides the trusted certificates, it's also possible to configure the trusted
+ cipher suites for HTTPS through another fw_cfg entry: etc/edk2/https/ciphers.
+
+ -fw_cfg name=etc/edk2/https/ciphers,file=<cipher suites>
+
+ OVMF expects a binary UINT16 array which comprises the cipher suites HEX
+ IDs(*4). If the cipher suite list is given, OVMF will choose the cipher
+ suite from the intersection of the given list and the built-in cipher
+ suites. Otherwise, OVMF just chooses whatever proper cipher suites from the
+ built-in ones.
+
+ While the tool(*5) to create the cipher suite array is still under
+ development, the array can be generated with the following script:
+
+ export LC_ALL=C
+ openssl ciphers -V \
+ | sed -r -n \
+ -e 's/^ *0x([0-9A-F]{2}),0x([0-9A-F]{2}) - .*$/\\\\x\1 \\\\x\2/p' \
+ | xargs -r -- printf -- '%b' > ciphers.bin
+
+ This script creates ciphers.bin that contains all the cipher suite IDs
+ supported by openssl according to the local host configuration.
+
+ You may want to enable only a limited set of cipher suites. Then, you
+ should check the validity of your list first:
+
+ openssl ciphers -V <cipher list>
+
+ If all the cipher suites in your list map to the proper HEX IDs, go ahead
+ to modify the script and execute it:
+
+ export LC_ALL=C
+ openssl ciphers -V <cipher list> \
+ | sed -r -n \
+ -e 's/^ *0x([0-9A-F]{2}),0x([0-9A-F]{2}) - .*$/\\\\x\1 \\\\x\2/p' \
+ | xargs -r -- printf -- '%b' > ciphers.bin
+
+* In the future (after release 2.12), QEMU should populate both above fw_cfg
+ files automatically from the local host configuration, and enable the user
+ to override either with dedicated options or properties
+
+(*1) See "31.4.1 Signature Database" in UEFI specification 2.7 errata A.
+(*2) p11-kit: https://github.com/p11-glue/p11-kit/
+(*3) efisiglist: https://github.com/rhboot/pesign/blob/master/src/efisiglist.c
+(*4)
https://wiki.mozilla.org/Security/Server_Side_TLS#Cipher_names_correspondence_table
+(*5) update-crypto-policies: https://github.com/nmav/fedora-crypto-policies
+
=== OVMF Flash Layout ===
Like all current IA32/X64 system designs, OVMF's firmware device (rom/flash)
--
2.16.3
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