Embed the nix SSL certificate file into the resulting binary.

This writes the SSL certs to a temporary file on startup and then
uses environment variables to control OpenSSL and curl so that
they use them. We have to do this because OSX no longer ships the
normal ca pems, and we statically link with these libraries.

nix/pkgs/urbit/default.nix

@@ -11,7 +11,7 @@ let
 
   deps =
     with pkgs;
-    [ curl gmp libsigsegv ncurses openssl zlib lmdb ];
+    [ curl gmp libsigsegv ncurses openssl zlib lmdb cacert xxd ];
 
   vendor =
     [ argon2 softfloat3 ed25519 ent ge-additions h2o scrypt uv murmur3 secp256k1 sni ];

nix/pkgs/urbit/release.nix

@@ -1,6 +1,6 @@
 { env_name, env, deps }:
 
-{ ent, ge-additions, name ? "urbit", debug ? false }:
+{ ent, ge-additions, cacert, xxd, name ? "urbit", debug ? false }:
 
 let
 
@@ -21,10 +21,12 @@ env.make_derivation {
   CPU_DEBUG        = debug;
   EVENT_TIME_DEBUG = false;
   NCURSES          = env.ncurses;
+  SSL_CERT_FILE    = "${cacert}/etc/ssl/certs/ca-bundle.crt";
 
-  name          = "${name}-${env_name}";
-  exename       = name;
-  src           = ../../../pkg/urbit;
-  cross_inputs  = crossdeps ++ vendor ++ [ ent ];
-  builder       = ./release.sh;
+  name              = "${name}-${env_name}";
+  exename           = name;
+  src               = ../../../pkg/urbit;
+  native_inputs     = [ xxd ];
+  cross_inputs      = crossdeps ++ vendor ++ [ ent ];
+  builder           = ./release.sh;
 }

nix/release.nix

@@ -21,7 +21,8 @@ let
 
   urbit = env:
     import ./pkgs/urbit/release.nix env
-      { ent = ent env; ge-additions = ge-additions env; debug = false; name = "urbit"; };
+      { ent = ent env; ge-additions = ge-additions env; cacert = nixpkgs.cacert;
+        xxd = nixpkgs.xxd; debug = false; name = "urbit"; };
 
   builds-for-platform = plat:
     plat.deps // {

pkg/urbit/.gitignore

@@ -3,6 +3,7 @@
 #
 /config.mk
 include/config.h
+include/ca-bundle.h
 #
 # Build Outputs
 #

pkg/urbit/Makefile

@@ -7,7 +7,7 @@ daemon = $(wildcard daemon/*.c)
 worker = $(wildcard worker/*.c)
 
 common  = $(jets) $(noun) $(vere)
-headers = $(shell find include -type f)
+headers = $(shell find include -type f) include/ca-bundle.h
 
 common_objs = $(shell echo $(common) | sed 's/\.c/.o/g')
 daemon_objs = $(shell echo $(daemon) | sed 's/\.c/.o/g')
@@ -22,6 +22,9 @@ all_exes = ./mug_tests jam_tests ./hashtable_tests ./urbit ./urbit-worker
 # -Wall issues all types of errors.  This is off (for now)
 CFLAGS := $(CFLAGS)
 
+ifeq ($(SSL_CERT_FILE),)
+  $(error SSL_CERT_FILE is undefined)
+endif
 
 ################################################################################
 
@@ -40,10 +43,16 @@ clean:
 	rm -f ./tags $(all_objs) $(all_exes)
 
 mrproper: clean
-	rm -f config.mk include/config.h
+	rm -f config.mk include/config.h include/ca-bundle.h
 
 ################################################################################
 
+include/ca-bundle.h:
+	@echo XXD -i $(SSL_CERT_FILE)
+	@cat $(SSL_CERT_FILE) > include/ca-bundle.crt
+	@xxd -i include/ca-bundle.crt > include/ca-bundle.h
+	@rm include/ca-bundle.crt
+
 hashtable_tests: $(common_objs) tests/hashtable_tests.o
 	@echo CC -o $@
 	@$(CC) $^ $(LDFLAGS) -o $@

pkg/urbit/daemon/main.c

@@ -24,6 +24,8 @@
 #include "all.h"
 #include "vere/vere.h"
 
+#include "ca-bundle.h"
+
 /* Require unsigned char
  */
 STATIC_ASSERT(( 0 == CHAR_MIN && UCHAR_MAX == CHAR_MAX ),
@@ -362,6 +364,29 @@ _main_getopt(c3_i argc, c3_c** argv)
   return c3y;
 }
 
+/* _setup_cert_store: writes our embedded certificate database to a temp file
+ */
+static void
+_setup_cert_store(char* tmp_cert_file_name)
+{
+  errno = 0;
+  int fd = mkstemp(tmp_cert_file_name);
+  if (fd < 1) {
+    printf("boot: failed to write local ssl temporary certificate store: %s\n",
+           strerror(errno));
+    exit(1);
+  }
+
+  if (-1 == write(fd, include_ca_bundle_crt, include_ca_bundle_crt_len)) {
+    printf("boot: failed to write local ssl temporary certificate store: %s\n",
+           strerror(errno));
+    exit(1);
+  }
+
+  setenv("SSL_CERT_FILE", tmp_cert_file_name, 1);
+}
+
+
 /* u3_ve_usage(): print usage and exit.
 */
 static void
@@ -677,6 +702,9 @@ main(c3_i   argc,
   }
   // printf("vere: hostname is %s\n", u3_Host.ops_u.nam_c);
 
+  u3K.certs_c = strdup("/tmp/urbit-ca-cert-XXXXXX");
+  _setup_cert_store(u3K.certs_c);
+
   if ( c3y == u3_Host.ops_u.dem && c3n == u3_Host.ops_u.bat ) {
     printf("boot: running as daemon\n");
   }
@@ -752,5 +780,6 @@ main(c3_i   argc,
 
     u3_daemon_commence();
   }
+
   return 0;
 }

pkg/urbit/include/vere/vere.h

@@ -699,6 +699,7 @@
       */
         typedef struct _u3_daemon {
           c3_c*     soc_c;                      //  socket name
+          c3_c*     certs_c;                    //  ssl certificate dump
           c3_w      len_w;                      //  number used
           c3_w      all_w;                      //  number allocated
           u3_pier** tab_u;                      //  pier table

pkg/urbit/vere/daemon.c

@@ -840,6 +840,7 @@ void
 _daemon_loop_exit()
 {
   unlink(u3K.soc_c);
+  unlink(u3K.certs_c);
 }
 
 /* u3_daemon_commence(): start the daemon