auth/factotum: add support for TOTP code generation

Because isv4() is never true for IPnoaddr,
we can skip the check.

Make validipmask() ensure that the top IPv4off
bytes are all 0xff, then check that the low
4 bytes are a valid mask (must be a power
of two minus one).

sys/man/1/git

@@ -183,6 +183,10 @@ git/pull, git/rm, git/serve \- Manage git repositories.
 .I filters
 ]
 [
+.B -r
+.I rel
+]
+[
 .I file...
 ]
 
@@ -331,7 +335,14 @@ is an alias for
 .PP
 .B Git/commit
 creates a new commit consisting of all changes to the specified files.
-By default, an editor is opened to prepare the commit message.
+By default,
+.I $editor
+is opened to prepare the commit message.
+If
+.I $editor
+is undefined
+.IR hold (1)
+is used.
 The 
 .B -m
 flag supplies the commit message directly.
@@ -532,6 +543,10 @@ The
 .B -q
 option suppresses all output.
 The
+.B -r
+option causes paths to be printed relative to the supplied directory
+.IR rel .
+The
 .B -f
 option filters files by status, and only matching items are printed.
 By default, the filters are

sys/man/4/factotum

@@ -1,6 +1,6 @@
 .TH FACTOTUM 4
 .SH NAME
-factotum, fgui, userpasswd \- authentication agent
+factotum, fgui, userpasswd, totp \- authentication agent
 .SH SYNOPSIS
 .B auth/factotum
 [
@@ -26,6 +26,14 @@ factotum, fgui, userpasswd \- authentication agent
 .PP
 .B auth/userpasswd
 .I fmt
+.PP
+.B auth/totp
+[
+.B -k
+.I pattern
+] | [
+.B label
+]
 .SH DESCRIPTION
 .I Factotum
 is a user-level file system that
@@ -258,6 +266,15 @@ key tuple specified in
 .IR fmt .
 This can be used by shell scripts to do cleartext password
 authentication.
+.PP
+.I Totp
+queries and prints an
+.B RFC 6238
+ TOTP code
+for the
+.B proto=totp
+key tuple specified.
+This can be used to authenticate with services that require time based OTP.
 .SS "Key Tuples
 .PP
 A

sys/src/cmd/auth/factotum/dat.h

@@ -228,3 +228,4 @@ extern Proto rsa;			/* rsa.c */
 extern Proto httpdigest;		/* httpdigest.c */
 extern Proto ecdsa;			/* ecdsa.c */
 extern Proto wpapsk;			/* wpapsk.c */
+extern Proto totp;			/* totp */

sys/src/cmd/auth/factotum/fs.c

@@ -43,6 +43,7 @@ prototab[] =
 	&vnc,
 	&ecdsa,
 	&wpapsk,
+	&totp,
 	nil,
 };
 

sys/src/cmd/auth/factotum/mkfile

@@ -14,6 +14,7 @@ PROTO=\
 	rsa.$O\
 	ecdsa.$O\
 	wpapsk.$O\
+	totp.$O\
 
 FOFILES=\
 	$PROTO\

sys/src/cmd/auth/factotum/totp.c

@@ -0,0 +1,146 @@
+#include "dat.h"
+
+typedef struct State State;
+struct State {
+	Key *key;
+};
+
+enum {
+	HaveTotp,
+	Maxphase,
+};
+
+enum {
+	Maxdigits = 8,
+	Sec = 1000*1000*1000,
+};
+
+static char *phasenames[Maxphase] ={
+	[HaveTotp]	"HaveTotp",
+};
+
+static int
+genhotp(uchar *key, int n, uvlong c, int len)
+{
+	uchar hash[SHA1dlen];
+	uchar data[8];
+	u32int h, m;
+	int o;
+
+	data[0] = (c>>56) & 0xff;
+	data[1] = (c>>48) & 0xff;
+	data[2] = (c>>40) & 0xff;
+	data[3] = (c>>32) & 0xff;
+	data[4] = (c>>24) & 0xff;
+	data[5] = (c>>16) & 0xff;
+	data[6] = (c>> 8) & 0xff;
+	data[7] = (c>> 0) & 0xff;
+	hmac_sha1(data, sizeof(data), key, n, hash, nil);
+	
+	o = hash[SHA1dlen - 1] & 0x0F;
+	h = ((hash[o] & 0x7F) << 24)
+		| (hash[o + 1] & 0xFF) << 16
+		| (hash[o + 2] & 0xFF) << 8
+		| hash[o + 3] & 0xFF;
+	m = 1;
+	while(len-- > 0)
+		m *= 10;
+	return h % m;
+}
+
+static int
+gentotp(char *secret, vlong t, int len, vlong period)
+{
+	uchar key[512];
+	int n;
+
+	n = dec32(key, sizeof(key), secret, strlen(secret));
+	if(n < 0){
+		werrstr("invalid totp secret");
+		return -1;
+	}
+	return genhotp(key, n, t/period, len);
+}
+
+static int
+totpinit(Proto *p, Fsstate *fss)
+{
+	int ret;
+	Key *k;
+	Keyinfo ki;
+	State *s;
+
+	ret = findkey(&k, mkkeyinfo(&ki, fss, nil), "%s", p->keyprompt);
+	if(ret != RpcOk)
+		return ret;
+	setattrs(fss->attr, k->attr);
+	s = emalloc(sizeof(*s));
+	s->key = k;
+	fss->ps = s;
+	fss->phase = HaveTotp;
+	return RpcOk;
+}
+
+static void
+totpclose(Fsstate *fss)
+{
+	State *s;
+
+	s = fss->ps;
+	if(s->key)
+		closekey(s->key);
+	free(s);
+}
+
+static int
+totpread(Fsstate *fss, void *va, uint *n)
+{
+	char *secret, *digits, *period;
+	int len, otp;
+	vlong tdiv;
+	State *s;
+
+	s = fss->ps;
+	len = 6;
+	tdiv = 30ULL*Sec;
+	switch(fss->phase){
+	default:
+		return phaseerror(fss, "read");
+
+	case HaveTotp:
+		digits = _strfindattr(s->key->attr, "digits");
+		secret = _strfindattr(s->key->privattr, "!secret");
+		period = _strfindattr(s->key->attr, "period");
+		if(secret==nil)
+			return failure(fss, "missing totp secret");
+		if(digits != nil)
+			len = atoi(digits);
+		if(period != nil)
+			tdiv = strtoll(period, nil, 0)*Sec;
+		if(*n < len)
+			return toosmall(fss, len);
+		if(len < 1 || len > Maxdigits || tdiv <= 0)
+			return failure(fss, "too many digits");
+		otp = gentotp(secret, nsec(), len, tdiv);
+		if(otp < 0)
+			return failure(fss, "%r");
+		*n = snprint(va, *n, "%.*d", len, otp);
+		return RpcOk;
+	}
+}
+
+static int
+totpwrite(Fsstate *fss, void*, uint)
+{
+	return phaseerror(fss, "write");
+}
+
+Proto totp = {
+	.name=		"totp",
+	.init=		totpinit,
+	.write=		totpwrite,
+	.read=		totpread,
+	.close=		totpclose,
+	.addkey=	replacekey,
+	.keyprompt=	"label? !secret?",
+};

sys/src/cmd/auth/mkfile

@@ -35,6 +35,7 @@ TARG=\
 	rsafill\
 	rsagen\
 	ssh2rsa\
+	totp\
 	uniq\
 	userpasswd\
 	warning\

sys/src/cmd/auth/totp.c

@@ -0,0 +1,48 @@
+#include <u.h>
+#include <libc.h>
+#include <auth.h>
+
+char *keypat;
+
+void
+usage(void)
+{
+	fprint(2, "usage: %s fmt\n", argv0);
+	exits("usage");
+}
+
+void
+main(int argc, char **argv)
+{
+	char params[512];
+	AuthRpc *rpc;
+	int fd;
+
+	ARGBEGIN{
+	case 'k':
+		keypat = EARGF(usage());
+		break;
+	default:
+		usage();
+	}ARGEND
+
+	quotefmtinstall();
+	if(keypat == nil)
+		snprint(params, sizeof(params), "proto=totp label=%q", argv[0]);
+	else
+		snprint(params, sizeof(params), "proto=totp %s", keypat);
+
+	if((fd = open("/mnt/factotum/rpc", ORDWR|OCEXEC)) == -1)
+		sysfatal("open /mnt/factotum/rpc: %r");
+	if((rpc = auth_allocrpc(fd)) == nil)
+		sysfatal("allocrpc: %r");
+	if(auth_rpc(rpc, "start", params, strlen(params)) != ARok
+	|| auth_rpc(rpc, "read", nil, 0) != ARok)
+		sysfatal("totp proto: %r");
+	rpc->arg[rpc->narg] = '\0';
+	print("%s\n", rpc->arg);
+
+	close(fd);
+	auth_freerpc(rpc);
+	exits(nil);
+}

sys/src/cmd/git/diff

@@ -21,7 +21,7 @@ if(! ~ $#* 0)
 
 branch=`{git/query -p $commit}
 if(~ $summarize 1 || ~ $uncommitted 1){
-	git/walk -f$filt $cparam $files
+	git/walk -r$gitrel -f$filt $cparam $files
 	exit
 }
 

sys/src/cmd/git/test/diff.rc

@@ -0,0 +1,46 @@
+#!/bin/rc
+
+. util.rc
+
+nl='
+'
+rm -fr scratch
+mkdir -p scratch/subdir/subdir2
+mkdir -p scratch/subdir3
+
+echo @@git diff -s relative@@
+@{
+	cd scratch
+	q git/init
+	echo hello > file.txt
+	echo hello1 > subdir/file1.txt
+	echo hello2 > subdir/subdir2/file2.txt
+	echo hello3 > subdir3/file3.txt
+	q git/add file.txt subdir/file1.txt subdir/subdir2/file2.txt subdir3/file3.txt
+	q git/commit -m initial .
+	echo >file.txt
+	echo >subdir/file1.txt
+	echo >subdir/subdir2/file2.txt
+	echo >subdir3/file3.txt
+
+	out=`$nl{git/diff -s . | awk '{ print $2 }'}
+	~ $out(1) file.txt && ~ $out(2) subdir/file1.txt && ~ $out(3) subdir/subdir2/file2.txt \
+		~ $out(4) subdir3/file3.txt || die 'base level fail'
+
+	cd subdir
+	out=`$nl{git/diff -s .. | awk '{ print $2 }'}
+	~ $out(1) ../file.txt && ~ $out(2) file1.txt && ~ $out(3) subdir2/file2.txt \
+		~ $out(4) ../subdir3/file3.txt || die 'subdir1 level fail'
+
+	cd subdir2
+	out=`$nl{git/diff -s ../.. | awk '{ print $2 }'}
+	~ $out(1) ../../file.txt && ~ $out(2) ../file1.txt && ~ $out(3) file2.txt \
+		~ $out(4) ../../subdir3/file3.txt || die 'subdir2 level fail'
+
+	cd ../../subdir3
+	out=`$nl{git/diff -s .. | awk '{ print $2 }'}
+	~ $out(1) ../file.txt && ~ $out(2) ../subdir/file1.txt && ~ $out(3) ../subdir/subdir2/file2.txt \
+		~ $out(4) file3.txt || die 'subdir3 level fail'
+
+	! git/diff -s ../.. >[2]/dev/null
+}

sys/src/cmd/git/test/mkfile

@@ -3,6 +3,7 @@
 TEST=\
 	add\
 	basic\
+	diff\
 	export\
 	ftype\
 	lca\

sys/src/cmd/git/walk.c

@@ -33,6 +33,8 @@ Seen	seentab[NCACHE];
 Idxed	idxtab[NCACHE];
 char	repopath[1024];
 char	wdirpath[1024];
+char	relapath[1024];
+int	nslash;
 char	*rstr	= "R ";
 char	*mstr	= "M ";
 char	*astr	= "A ";
@@ -347,15 +349,56 @@ reporel(char *s)
 void
 show(Biobuf *o, int flg, char *str, char *path)
 {
+	char *pa, *pb;
+	int n;
+
 	dirty |= flg;
-	if(!quiet && (printflg & flg))
-		Bprint(o, "%s%s\n", str, path);
+	if(!quiet && (printflg & flg)){
+		Bprint(o, str);
+		n = nslash;
+		if(n){
+			for(pa = relapath, pb = path; *pa && *pb; pa++, pb++){
+				if(*pa != *pb)
+					break;
+				if(*pa == '/'){
+					n--;
+					path = pb+1;
+				}
+			}
+			while(n-- > 0)
+				Bprint(o, "../");
+		}
+		Bprint(o, "%s\n", path);
+	}
+}
+
+void
+findslashes(char *path)
+{
+	char *p;
+
+	p = cleanname(path);
+	if(p[0] == '.'){
+		if(p[1] == '\0')
+			return;
+		else if(p[1] == '.' && (p[2] == '/' || p[2] == '\0'))
+			sysfatal("relative path escapes git root");
+	}
+	
+	snprint(relapath, sizeof relapath, "%s/", p);
+	p = relapath;
+	if(*p == '/')
+		p++;
+
+	for(; *p; p++)
+		if(*p == '/')
+			nslash++;
 }
 
 void
 usage(void)
 {
-	fprint(2, "usage: %s [-qbc] [-f filt] [-b base] [paths...]\n", argv0);
+	fprint(2, "usage: %s [-qbc] [-f filt] [-b base] [-r rel] [paths...]\n", argv0);
 	exits("usage");
 }
 
@@ -410,6 +453,9 @@ main(int argc, char **argv)
 			useidx = 1;
 		bdir = smprint(".git/fs/object/%H/tree", h);
 		break;
+	case 'r':
+		findslashes(EARGF(usage()));
+		break;
 	default:
 		usage();
 	}ARGEND;

sys/src/cmd/ip/dhcpd/dat.h

@@ -49,7 +49,6 @@ struct Info
 
 
 /* from dhcp.c */
-extern int	validip(uchar*);
 extern void	fatal(char*, ...);
 extern void	warning(char*, ...);
 #pragma	varargck argpos	fatal 1
@@ -57,6 +56,8 @@ extern void	warning(char*, ...);
 extern int	minlease;
 
 /* from db.c */
+extern int	validip(uchar*);
+extern int	validipmask(uchar*);
 extern char*	toid(uchar*, int);
 extern void	initbinding(uchar*, int);
 extern Binding*	iptobinding(uchar*, int);

sys/src/cmd/ip/dhcpd/db.c

@@ -412,3 +412,22 @@ releasebinding(Binding *b, char *id)
 	close(fd);
 	return 0;
 }
+
+int
+validip(uchar *ip)
+{
+	if(ipcmp(ip, v4prefix) == 0)
+		return 0;
+	return isv4(ip);
+}
+
+int
+validipmask(uchar *mask)
+{
+	unsigned x;
+
+	if(memcmp(mask, IPallbits, IPv4off) != 0)
+		return 0;
+	x = ~(mask[IPv4off+0] << 24 | mask[IPv4off+1] << 16 | mask[IPv4off+2] << 8 | mask[IPv4off+3]);
+	return ((x + 1U) & x) == 0;
+}

sys/src/cmd/ip/dhcpd/dhcpd.c

@@ -191,7 +191,6 @@ void	sendnak(Req*, uchar*, char*);
 void	sendoffer(Req*, uchar*, int);
 void	stringopt(Req*, int, char*);
 void	termopt(Req*);
-int	validip(uchar*);
 void	vectoropt(Req*, int, uchar*, int);
 
 void
@@ -1134,9 +1133,9 @@ miscoptions(Req *rp, uchar *ip)
 		addrs[i] = &x[i*IPaddrlen];
 
 	/* always supply these */
-	if(validip(rp->ii.ipmask))
+	if(validipmask(rp->ii.ipmask))
 		maskopt(rp, OBmask, rp->ii.ipmask);
-	else if(validip(rp->gii.ipmask))
+	else if(validipmask(rp->gii.ipmask))
 		maskopt(rp, OBmask, rp->gii.ipmask);
 	else if((lifc = ipremoteonifc(rp->ifc, ip)) != nil)
 		maskopt(rp, OBmask, lifc->mask);
@@ -1389,16 +1388,6 @@ readsysname(void)
 	return p;
 }
 
-extern int
-validip(uchar *ip)
-{
-	if(ipcmp(ip, IPnoaddr) == 0)
-		return 0;
-	if(ipcmp(ip, v4prefix) == 0)
-		return 0;
-	return 1;
-}
-
 void
 longopt(Req *rp, int t, long v)
 {

sys/src/cmd/ip/dhcpd/dhcpleases.c

@@ -35,7 +35,9 @@ main(void)
 	b.lease = b.offer = 0;
 	now = time(0);
 	for(i = 0; i < nall; i++){
-		if(parseip(b.ip, all[i].name) == -1 || syncbinding(&b, 0) < 0)
+		if(parseip(b.ip, all[i].name) == -1
+		|| !validip(b.ip)
+		|| syncbinding(&b, 0) < 0)
 			continue;
 		if(b.lease > now)
 			print("%I leased by %s until %s", b.ip, b.boundto,

sys/src/cmd/ip/dhcpd/ndb.c

@@ -57,17 +57,21 @@ localip(uchar *laddr, uchar *raddr, Ipifc *ifc)
 }
 
 static void
-setipaddr(uchar *addr, char *ip)
+setipaddr(uchar *ip, char *s)
 {
-	if(ipcmp(addr, IPnoaddr) == 0)
-		parseip(addr, ip);
+	if(ipcmp(ip, IPnoaddr) == 0)
+		if(parseip(ip, s) == -1
+		|| !validip(ip))
+			ipmove(ip, IPnoaddr);	/* invalid */
 }
 
 static void
-setipmask(uchar *mask, char *ip)
+setipmask(uchar *mask, char *s)
 {
 	if(ipcmp(mask, IPnoaddr) == 0)
-		parseipmask(mask, ip, 1);
+		if(parseipmask(mask, s, 1) == -1
+		|| !validipmask(mask))
+			ipmove(mask, IPnoaddr);	/* invalid */
 }
 
 /*
@@ -228,9 +232,7 @@ lookup(Bootp *bp, Info *iip, Info *riip)
 		for(nt = t; nt != nil; nt = nt->entry){
 			if(strcmp(nt->attr, "ip") != 0)
 				continue;
-			if(parseip(ciaddr, nt->val) == -1 || !isv4(ciaddr))
-				continue;
-			if(!validip(ciaddr))
+			if(parseip(ciaddr, nt->val) == -1 || !validip(ciaddr))
 				continue;
 			if(!samenet(ciaddr, riip))
 				continue;