1 files changed, 0 insertions, 344 deletions
diff --git a/src/cmd/secstore/pak.c b/src/cmd/secstore/pak.c
deleted file mode 100644
index fb008e0f..00000000
--- a/src/cmd/secstore/pak.c
+++ /dev/null
@@ -1,344 +0,0 @@
-// PAK is an encrypted key exchange protocol designed by Philip MacKenzie et al.
-// It is patented and use outside Plan 9 requires you get a license.
-// (All other EKE protocols are patented as well, by Lucent or others.)
-#include <u.h>
-#include <libc.h>
-#include <mp.h>
-#include <libsec.h>
-#include "SConn.h"
-#include "secstore.h"
-
-extern int verbose;
-
-char VERSION[] = "secstore";
-static char *feedback[] = {"alpha","bravo","charlie","delta","echo","foxtrot","golf","hotel"};
-
-typedef struct PAKparams{
-	mpint *q, *p, *r, *g;
-} PAKparams;
-
-static PAKparams *pak;
-
-// from seed EB7B6E35F7CD37B511D96C67D6688CC4DD440E1E
-static void
-initPAKparams(void)
-{
-	if(pak)
-		return;
-	pak = (PAKparams*)emalloc(sizeof(*pak));
-	pak->q = strtomp("E0F0EF284E10796C5A2A511E94748BA03C795C13", nil, 16, nil);
-	pak->p = strtomp("C41CFBE4D4846F67A3DF7DE9921A49D3B42DC33728427AB159CEC8CBB"
-		"DB12B5F0C244F1A734AEB9840804EA3C25036AD1B61AFF3ABBC247CD4B384224567A86"
-		"3A6F020E7EE9795554BCD08ABAD7321AF27E1E92E3DB1C6E7E94FAAE590AE9C48F96D9"
-		"3D178E809401ABE8A534A1EC44359733475A36A70C7B425125062B1142D",
-		nil, 16, nil);
-	pak->r = strtomp("DF310F4E54A5FEC5D86D3E14863921E834113E060F90052AD332B3241"
-		"CEF2497EFA0303D6344F7C819691A0F9C4A773815AF8EAECFB7EC1D98F039F17A32A7E"
-		"887D97251A927D093F44A55577F4D70444AEBD06B9B45695EC23962B175F266895C67D"
-		"21C4656848614D888A4", nil, 16, nil);
-	pak->g = strtomp("2F1C308DC46B9A44B52DF7DACCE1208CCEF72F69C743ADD4D23271734"
-		"44ED6E65E074694246E07F9FD4AE26E0FDDD9F54F813C40CB9BCD4338EA6F242AB94CD"
-		"410E676C290368A16B1A3594877437E516C53A6EEE5493A038A017E955E218E7819734"
-		"E3E2A6E0BAE08B14258F8C03CC1B30E0DDADFCF7CEDF0727684D3D255F1",
-		nil, 16, nil);
-}
-
-// H = (sha(ver,C,sha(passphrase)))^r mod p,
-// a hash function expensive to attack by brute force.
-static void
-longhash(char *ver, char *C, uchar *passwd, mpint *H)
-{
-	uchar *Cp;
-	int i, n, nver, nC;
-	uchar buf[140], key[1];
-
-	nver = strlen(ver);
-	nC = strlen(C);
-	n = nver + nC + SHA1dlen;
-	Cp = (uchar*)emalloc(n);
-	memmove(Cp, ver, nver);
-	memmove(Cp+nver, C, nC);
-	memmove(Cp+nver+nC, passwd, SHA1dlen);
-	for(i = 0; i < 7; i++){
-		key[0] = 'A'+i;
-		hmac_sha1(Cp, n, key, sizeof key, buf+i*SHA1dlen, nil);
-	}
-	memset(Cp, 0, n);
-	free(Cp);
-	betomp(buf, sizeof buf, H);
-	mpmod(H, pak->p, H);
-	mpexp(H, pak->r, pak->p, H);
-}
-
-// Hi = H^-1 mod p
-char *
-PAK_Hi(char *C, char *passphrase, mpint *H, mpint *Hi)
-{
-	uchar passhash[SHA1dlen];
-
-	sha1((uchar *)passphrase, strlen(passphrase), passhash, nil);
-	initPAKparams();
-	longhash(VERSION, C, passhash, H);
-	mpinvert(H, pak->p, Hi);
-	return mptoa(Hi, 64, nil, 0);
-}
-
-// another, faster, hash function for each party to
-// confirm that the other has the right secrets.
-static void
-shorthash(char *mess, char *C, char *S, char *m, char *mu, char *sigma, char *Hi, uchar *digest)
-{
-	SHA1state *state;
-
-	state = sha1((uchar*)mess, strlen(mess), 0, 0);
-	state = sha1((uchar*)C, strlen(C), 0, state);
-	state = sha1((uchar*)S, strlen(S), 0, state);
-	state = sha1((uchar*)m, strlen(m), 0, state);
-	state = sha1((uchar*)mu, strlen(mu), 0, state);
-	state = sha1((uchar*)sigma, strlen(sigma), 0, state);
-	state = sha1((uchar*)Hi, strlen(Hi), 0, state);
-	state = sha1((uchar*)mess, strlen(mess), 0, state);
-	state = sha1((uchar*)C, strlen(C), 0, state);
-	state = sha1((uchar*)S, strlen(S), 0, state);
-	state = sha1((uchar*)m, strlen(m), 0, state);
-	state = sha1((uchar*)mu, strlen(mu), 0, state);
-	state = sha1((uchar*)sigma, strlen(sigma), 0, state);
-	sha1((uchar*)Hi, strlen(Hi), digest, state);
-}
-
-// On input, conn provides an open channel to the server;
-//	C is the name this client calls itself;
-//	pass is the user's passphrase
-// On output, session secret has been set in conn
-//	(unless return code is negative, which means failure).
-//    If pS is not nil, it is set to the (alloc'd) name the server calls itself.
-int
-PAKclient(SConn *conn, char *C, char *pass, char **pS)
-{
-	char *mess, *mess2, *eol, *S, *hexmu, *ks, *hexm, *hexsigma = nil, *hexHi;
-	char kc[2*SHA1dlen+1];
-	uchar digest[SHA1dlen];
-	int rc = -1, n;
-	mpint *x, *m = mpnew(0), *mu = mpnew(0), *sigma = mpnew(0);
-	mpint *H = mpnew(0), *Hi = mpnew(0);
-
-	hexHi = PAK_Hi(C, pass, H, Hi);
-	if(verbose)
-		fprint(2,"%s\n", feedback[H->p[0]&0x7]);  // provide a clue to catch typos
-
-	// random 1<=x<=q-1; send C, m=g**x H
-	x = mprand(240, genrandom, nil);
-	mpmod(x, pak->q, x);
-	if(mpcmp(x, mpzero) == 0)
-		mpassign(mpone, x);
-	mpexp(pak->g, x, pak->p, m);
-	mpmul(m, H, m);
-	mpmod(m, pak->p, m);
-	hexm = mptoa(m, 64, nil, 0);
-	mess = (char*)emalloc(2*Maxmsg+2);
-	mess2 = mess+Maxmsg+1;
-	snprint(mess, Maxmsg, "%s\tPAK\nC=%s\nm=%s\n", VERSION, C, hexm);
-	conn->write(conn, (uchar*)mess, strlen(mess));
-
-	// recv g**y, S, check hash1(g**xy)
-	if(readstr(conn, mess) < 0){
-		fprint(2, "error: %s\n", mess);
-		writerr(conn, "couldn't read g**y");
-		goto done;
-	}
-	eol = strchr(mess, '\n');
-	if(strncmp("mu=", mess, 3) != 0 || !eol || strncmp("\nk=", eol, 3) != 0){
-		writerr(conn, "verifier syntax error");
-		goto done;
-	}
-	hexmu = mess+3;
-	*eol = 0;
-	ks = eol+3;
-	eol = strchr(ks, '\n');
-	if(!eol || strncmp("\nS=", eol, 3) != 0){
-		writerr(conn, "verifier syntax error for secstore 1.0");
-		goto done;
-	}
-	*eol = 0;
-	S = eol+3;
-	eol = strchr(S, '\n');
-	if(!eol){
-		writerr(conn, "verifier syntax error for secstore 1.0");
-		goto done;
-	}
-	*eol = 0;
-	if(pS)
-		*pS = estrdup(S);
-	strtomp(hexmu, nil, 64, mu);
-	mpexp(mu, x, pak->p, sigma);
-	hexsigma = mptoa(sigma, 64, nil, 0);
-	shorthash("server", C, S, hexm, hexmu, hexsigma, hexHi, digest);
-	enc64(kc, sizeof kc, digest, SHA1dlen);
-	if(strcmp(ks, kc) != 0){
-		writerr(conn, "verifier didn't match");
-		goto done;
-	}
-
-	// send hash2(g**xy)
-	shorthash("client", C, S, hexm, hexmu, hexsigma, hexHi, digest);
-	enc64(kc, sizeof kc, digest, SHA1dlen);
-	snprint(mess2, Maxmsg, "k'=%s\n", kc);
-	conn->write(conn, (uchar*)mess2, strlen(mess2));
-
-	// set session key
-	shorthash("session", C, S, hexm, hexmu, hexsigma, hexHi, digest);
-	memset(hexsigma, 0, strlen(hexsigma));
-	n = conn->secret(conn, digest, 0);
-	memset(digest, 0, SHA1dlen);
-	if(n < 0){
-		writerr(conn, "can't set secret");
-		goto done;
-	}
-
-	rc = 0;
-done:
-	mpfree(x);
-	mpfree(sigma);
-	mpfree(mu);
-	mpfree(m);
-	mpfree(Hi);
-	mpfree(H);
-	free(hexsigma);
-	free(hexHi);
-	free(hexm);
-	free(mess);
-	return rc;
-}
-
-// On input,
-//	mess contains first message;
-//	name is name this server should call itself.
-// On output, session secret has been set in conn;
-//	if pw!=nil, then *pw points to PW struct for authenticated user.
-//	returns -1 if error
-int
-PAKserver(SConn *conn, char *S, char *mess, PW **pwp)
-{
-	int rc = -1, n;
-	char mess2[Maxmsg+1], *eol;
-	char *C, ks[41], *kc, *hexm, *hexmu = nil, *hexsigma = nil, *hexHi = nil;
-	uchar digest[SHA1dlen];
-	mpint *H = mpnew(0), *Hi = mpnew(0);
-	mpint *y = nil, *m = mpnew(0), *mu = mpnew(0), *sigma = mpnew(0);
-	PW *pw = nil;
-
-	// secstore version and algorithm
-	snprint(mess2,Maxmsg,"%s\tPAK\n", VERSION);
-	n = strlen(mess2);
-	if(strncmp(mess,mess2,n) != 0){
-		writerr(conn, "protocol should start with ver alg");
-		return -1;
-	}
-	mess += n;
-	initPAKparams();
-
-	// parse first message into C, m
-	eol = strchr(mess, '\n');
-	if(strncmp("C=", mess, 2) != 0 || !eol){
-		fprint(2,"mess[1]=%s\n", mess);
-		writerr(conn, "PAK version mismatch");
-		goto done;
-	}
-	C = mess+2;
-	*eol = 0;
-	hexm = eol+3;
-	eol = strchr(hexm, '\n');
-	if(strncmp("m=", hexm-2, 2) != 0 || !eol){
-		writerr(conn, "PAK version mismatch");
-		goto done;
-	}
-	*eol = 0;
-	strtomp(hexm, nil, 64, m);
-	mpmod(m, pak->p, m);
-
-	// lookup client
-	if((pw = getPW(C,0)) == nil) {
-		snprint(mess2, sizeof mess2, "%r");
-		writerr(conn, mess2);
-		goto done;
-	}
-	if(mpcmp(m, mpzero) == 0) {
-		writerr(conn, "account exists");
-		freePW(pw);
-		pw = nil;
-		goto done;
-	}
-	hexHi = mptoa(pw->Hi, 64, nil, 0);
-
-	// random y, mu=g**y, sigma=g**xy
-	y = mprand(240, genrandom, nil);
-	mpmod(y, pak->q, y);
-	if(mpcmp(y, mpzero) == 0){
-		mpassign(mpone, y);
-	}
-	mpexp(pak->g, y, pak->p, mu);
-	mpmul(m, pw->Hi, m);
-	mpmod(m, pak->p, m);
-	mpexp(m, y, pak->p, sigma);
-
-	// send g**y, hash1(g**xy)
-	hexmu = mptoa(mu, 64, nil, 0);
-	hexsigma = mptoa(sigma, 64, nil, 0);
-	shorthash("server", C, S, hexm, hexmu, hexsigma, hexHi, digest);
-	enc64(ks, sizeof ks, digest, SHA1dlen);
-	snprint(mess2, sizeof mess2, "mu=%s\nk=%s\nS=%s\n", hexmu, ks, S);
-	conn->write(conn, (uchar*)mess2, strlen(mess2));
-
-	// recv hash2(g**xy)
-	if(readstr(conn, mess2) < 0){
-		writerr(conn, "couldn't read verifier");
-		goto done;
-	}
-	eol = strchr(mess2, '\n');
-	if(strncmp("k'=", mess2, 3) != 0 || !eol){
-		writerr(conn, "verifier syntax error");
-		goto done;
-	}
-	kc = mess2+3;
-	*eol = 0;
-	shorthash("client", C, S, hexm, hexmu, hexsigma, hexHi, digest);
-	enc64(ks, sizeof ks, digest, SHA1dlen);
-	if(strcmp(ks, kc) != 0) {
-		rc = -2;
-		goto done;
-	}
-
-	// set session key
-	shorthash("session", C, S, hexm, hexmu, hexsigma, hexHi, digest);
-	n = conn->secret(conn, digest, 1);
-	if(n < 0){
-		writerr(conn, "can't set secret");
-		goto done;
-	}
-
-	rc = 0;
-done:
-	if(rc<0 && pw){
-		pw->failed++;
-		putPW(pw);
-	}
-	if(rc==0 && pw && pw->failed>0){
-		pw->failed = 0;
-		putPW(pw);
-	}
-	if(pwp)
-		*pwp = pw;
-	else
-		freePW(pw);
-	free(hexsigma);
-	free(hexHi);
-	free(hexmu);
-	mpfree(y);
-	mpfree(sigma);
-	mpfree(mu);
-	mpfree(m);
-	mpfree(Hi);
-	mpfree(H);
-	return rc;
-}
-