Enable support for keys obtained through PKCS#11

This allows signing using a HSM or a Smartcard (ex. Yubikey)
Look at PKCS11.md for help on getting started.

Sponsered by: @ZonD80

Makefile

@@ -31,6 +31,10 @@ LIBCRYPTO_INCLUDES ?= $(shell pkg-config --cflags libcrypto)
 LIBCRYPTO_LIBS     ?= $(shell pkg-config --libs libcrypto)
 endif
 
+ifeq ($(SMARTCARD),1)
+CPPFLAGS += -DSMARTCARD
+endif
+
 MANPAGE_LANGS := zh_TW zh_CN
 
 EXT ?=

PKCS11.md

@@ -0,0 +1,24 @@
+## Setup
+1. Build with `make SMARTCARD=1`
+2. Install the OpenSSL engine for PKCS#11 (`libengine-pkcs11-openssl` on Debian, part of `libp11`)
+
+## Load Key Into Smartcard
+It is recommend that you generate the key on the card itself, but you can import it if needed.
+
+For yubikeys:
+1. Extract Cert and Key from p12
+```
+openssl pkcs12 -in Certificates.p12 -out cert.crt.pem -clcerts -nokeys -legacy
+openssl pkcs12 -in Certificates.p12 -out key.pem -nocerts -nodes -legacy
+```
+2. Import into Key
+```
+yubico-piv-tool -s 9c -a import-certificate -i cert.crt.pem
+yubico-piv-tool -s 9c -a import-key -i key.pem
+yubico-piv-tool -s 9c -a set-chuid
+```
+3. You can use `p11tool --list-privkeys --login` to identify the URI for the slot (make sure that `type` is not in the URI, as seperate URIs for the cert and private key are not currently supported from the command line)
+
+## Sign
+1. `ldid -K'pkcs11:model=YubiKey%20YK5;id=%02' -Sents.xml ls.bin`
+2. If the correct PKCS#11 module is not being loaded, try setting `PKCS11_MODULE_PATH` in your environment (ex. `export PKCS11_MODULE_PATH="/usr/local/lib/p11-kit-proxy.so"` or `PKCS11_MODULE_PATH="/usr/local/lib/libykcs11.so"`)

README.md

@@ -6,3 +6,4 @@ Changes from https://git.saurik.com/ldid.git:
 - Allow p12 keys to have a password (@sunflsks)
 - Add a `-arch arch_type` flag so that typing the raw CPU type is not needed
 - Proper error messages
+- Load key using PKCS#11

docs/ldid.1

@@ -20,7 +20,7 @@
 .Op Fl H Ns Op Ar sha1 | Ar sha256
 .Op Fl h
 .Op Fl I Ns Ar name
-.Op Fl K Ns Ar key.p12 Op Fl U Ns Ar password
+.Op Fl K Ns Ar file Op Fl U Ns Ar password
 .Op Fl M
 .Op Fl P Ns Op Ar num
 .Op Fl Q Ns Ar requirements
@@ -93,14 +93,19 @@ hash types, flags, CDHash, and CodeDirectory version to
 Set the identifier used in the binaries signature to
 .Ar name .
 If not specified, the basename of the binary is used.
-.It Fl K Ns Ar key.p12
+.It Fl K Ns Ar file
 Sign using the identity in
-.Ar key.p12 .
+.Ar file .
+Must be either a
+.Ar p12
+or
+.Ar pkcs11:
+URI.
 This will give the binary a valid signature so that it can be run
 on a system with signature validation.
-If
-.Ar key.p12
-has a password you will be prompted for it,
+If the
+.Ar p12
+has a password, you will be prompted for it,
 or you can specify from the command line with
 .Fl U .
 .It Fl M