From: Michael Brown <mcb30@ipxe.org>
Date: Sun, 18 Mar 2012 22:55:29 +0000 (+0000)
Subject: [build] Allow trusted root certificates to be specified at build time
X-Git-Tag: v1.20.1~1927
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=aee3a064f22f994a930990c1bb0d339412e65d76;p=thirdparty%2Fipxe.git

[build] Allow trusted root certificates to be specified at build time

Allow trusted root certificates to be specified at build time using
the syntax

  make TRUST=/path/to/certificate1,/path/to/certificate2,...

The build process uses openssl to calculate the SHA-256 fingerprints
of the specified certificates, and adds them to the root certificate
store in rootcert.c.  The certificates can be in any format understood
by openssl.

The certificates may be server certificates or (more usefully) CA
certificates.

If no trusted certificates are specified, then the default "iPXE root
CA" certificate will be used.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
---

diff --git a/src/Makefile b/src/Makefile
index c30dc5c97..0189a469d 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -32,6 +32,7 @@ RANLIB		:= $(CROSS_COMPILE)ranlib
 OBJCOPY		:= $(CROSS_COMPILE)objcopy
 NM		:= $(CROSS_COMPILE)nm
 OBJDUMP		:= $(CROSS_COMPILE)objdump
+OPENSSL		:= openssl
 PARSEROM	:= ./util/parserom.pl
 FIXROM		:= ./util/fixrom.pl
 SYMCHECK	:= ./util/symcheck.pl
diff --git a/src/Makefile.housekeeping b/src/Makefile.housekeeping
index 41c595628..daac97b9f 100644
--- a/src/Makefile.housekeeping
+++ b/src/Makefile.housekeeping
@@ -637,6 +637,34 @@ $(BIN)/embedded.o : override CC := env CCACHE_DISABLE=1 $(CC)
 
 CFLAGS_embedded = -DEMBED_ALL="$(EMBED_ALL)"
 
+# List of trusted root certificates
+#
+TRUSTED_LIST	:= $(BIN)/.trusted.list
+ifeq ($(wildcard $(TRUSTED_LIST)),)
+TRUST_OLD := <invalid>
+else
+TRUST_OLD := $(shell cat $(TRUSTED_LIST))
+endif
+ifneq ($(TRUST_OLD),$(TRUST))
+$(shell $(ECHO) "$(TRUST)" > $(TRUSTED_LIST))
+endif
+
+$(TRUSTED_LIST) :
+
+VERYCLEANUP	+= $(TRUSTED_LIST)
+
+# Trusted root certificate fingerprints
+#
+TRUSTED_CERTS	:= $(subst $(COMMA), ,$(TRUST))
+TRUSTED_FPS	:= $(foreach CERT,$(TRUSTED_CERTS),\
+		     0x$(subst :,$(COMMA) 0x,$(lastword $(subst =, ,\
+			 $(shell $(OPENSSL) x509 -in $(CERT) -noout -sha256 \
+				 -fingerprint))))$(COMMA))
+
+$(BIN)/rootcert.o : $(TRUSTED_FILES) $(TRUSTED_LIST)
+
+CFLAGS_rootcert = $(if $(TRUSTED_FPS),-DTRUSTED="$(TRUSTED_FPS)")
+
 # Generate error usage information
 #
 $(BIN)/%.einfo : $(BIN)/%.o