merge

sys/man/4/keyfs

@@ -14,6 +14,9 @@ keyfs, warning \- authentication database files
 .BI -m mntpt
 ]
 [
+.B -r
+]
+[
 .I keyfile
 ]
 .PP
@@ -84,6 +87,10 @@ If any changes are made to the database that affect the information stored in
 .IR keyfile ,
 a new version of the file is written.
 .PP
+If the
+.B -r
+option is given, the database is mounted `read-only' and no changes are permitted.
+.PP
 There are two authentication databases,
 one for Plan 9 user information,
 and one for SecureNet user information.

sys/src/cmd/auth/asaudit.c

@@ -0,0 +1,106 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include <authsrv.h>
+#include <ndb.h>
+
+int havenvram;
+Nvrsafe nvr;
+char eve[128];
+Ndb *db;
+
+void
+geteve(void)
+{
+	int fd;
+	
+	fd = open("#c/hostowner", OREAD);
+	if(fd < 0) sysfatal("open: %r");
+	memset(eve, 0, sizeof(eve));
+	if(read(fd, eve, sizeof(eve)-1) < 0) sysfatal("read: %r");
+	close(fd);
+	if(strcmp(getuser(), eve) != 0) print("hostowner is %#q, but running as %#q\n", eve, getuser());
+}
+
+void
+ndb(void)
+{
+	db = ndbopen(nil);
+	if(db == nil){
+		print("ndbopen: %r");
+		return;
+	}
+}
+
+void
+nvram(void)
+{
+	char *auth;
+
+	if(readnvram(&nvr, 0) < 0){
+		print("readnvram: %r\n");
+		return;
+	}
+	havenvram = 1;
+	print("found nvram key for user '%s@%s'\n", nvr.authid, nvr.authdom);
+	if(strcmp(eve, nvr.authid) != 0) print("nvram authid doesn't match hostowner %#q\n", eve);
+	if(db != nil){
+		auth = ndbgetvalue(db, nil, "authdom", nvr.authdom, "auth", nil);
+		if(auth == nil) print("authdom %#q not found in ndb\n", nvr.authdom);
+		else{
+			print("ndb says authdom %#q corresponds to auth server %#q\n", nvr.authdom, auth);
+			free(auth);
+		}
+	}
+}
+
+void
+keyfs(void)
+{
+	char *buf;
+	int fd;
+	char aes[AESKEYLEN];
+
+	if(!havenvram) return;
+	if(access("/adm/keys", AREAD) < 0){
+		print("no access to /adm/keys\n");
+		return;
+	}
+	print("starting keyfs\n");
+	rfork(RFNAMEG);
+	switch(fork()){
+	case -1:
+		sysfatal("fork: %r");
+	case 0:
+		if(execl("/bin/auth/keyfs", "auth/keyfs", "-r", nil) < 0)
+			sysfatal("execl: %r");
+	}
+	waitpid();
+	buf = smprint("/mnt/keys/%s/aeskey", nvr.authid);
+	fd = open(buf, OREAD);
+	if(fd < 0){
+		print("can't get key from keyfs: %r");
+		return;
+	}
+	werrstr("short read");
+	if(read(fd, aes, sizeof(aes)) < sizeof(aes)){
+		print("read: %r");
+		close(fd);
+		return;
+	}
+	if(memcmp(nvr.aesmachkey, aes, AESKEYLEN) != 0)
+		print("key in keyfs does not match nvram\n");
+	else
+		print("key in keyfs matches nvram\n");
+	close(fd);
+}
+
+void
+main()
+{
+	quotefmtinstall();
+	geteve();
+	ndb();
+	nvram();
+	keyfs();
+}

sys/src/cmd/auth/keyfs.c

@@ -92,6 +92,7 @@ int	nuser;
 ulong	uniq = 1;
 Fcall	rhdr, thdr;
 int	usepass;
+int	readonly;
 char	*warnarg;
 uchar	mdata[8192 + IOHDRSZ];
 int	messagesize = sizeof mdata;
@@ -137,7 +138,7 @@ char 	*(*fcalls[])(Fid*) = {
 static void
 usage(void)
 {
-	fprint(2, "usage: %s [-p] [-m mtpt] [-w warn] [keyfile]\n", argv0);
+	fprint(2, "usage: %s [-p] [-r] [-m mtpt] [-w warn] [keyfile]\n", argv0);
 	exits("usage");
 }
 
@@ -165,6 +166,9 @@ main(int argc, char *argv[])
 	case 'w':
 		warnarg = EARGF(usage());
 		break;
+	case 'r':
+		readonly = 1;
+		break;
 	default:
 		usage();
 		break;
@@ -390,6 +394,8 @@ Create(Fid *f)
 
 	if(!f->busy)
 		return "create of unused fid";
+	if(readonly)
+		return "mounted read-only";
 	name = rhdr.name;
 	if(f->user != nil){
 		return "permission denied";
@@ -531,6 +537,8 @@ Write(Fid *f)
 
 	if(!f->busy)
 		return "permission denied";
+	if(readonly)
+		return "mounted read-only";
 	n = rhdr.count;
 	data = rhdr.data;
 	switch(f->qtype){
@@ -613,6 +621,10 @@ Remove(Fid *f)
 {
 	if(!f->busy)
 		return "permission denied";
+	if(readonly){
+		Clunk(f);
+		return "mounted read-only";
+	}
 	if(f->qtype == Qwarnings)
 		f->user->warnings = 0;
 	else if(f->qtype == Quser)
@@ -649,6 +661,8 @@ Wstat(Fid *f)
 
 	if(!f->busy || f->qtype != Quser)
 		return "permission denied";
+	if(readonly)
+		return "mounted read-only";
 	if(rhdr.nstat > sizeof buf)
 		return "wstat buffer too big";
 	if(convM2D(rhdr.stat, rhdr.nstat, &d, buf) == 0)
@@ -712,6 +726,11 @@ writeusers(void)
 	uchar *p, *buf;
 	ulong expire;
 
+	if(readonly){
+		fprint(2, "writeusers called while read-only; shouldn't happen\n");
+		return;
+	}
+
 	/* what format to use */
 	keydblen = KEYDBLEN;
 	keydboff = KEYDBOFF;

sys/src/cmd/auth/mkfile

@@ -4,6 +4,7 @@
 #
 TARG=\
 	as\
+	asaudit\
 	asn12dsa\
 	asn12rsa\
 	authsrv\