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zxdecode.c
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zxdecode.c
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/* zxdecode.c - SAML Decoding tool
* Copyright (c) 2008-2011 Sampo Kellomaki (sampo@iki.fi), All Rights Reserved.
* This is confidential unpublished proprietary source code of the author.
* NO WARRANTY, not even implied warranties. Contains trade secrets.
* Distribution prohibited unless authorized in writing.
* Licensed under Apache License 2.0, see file COPYING.
* $Id: zxdecode.c,v 1.8 2009-11-29 12:23:06 sampo Exp $
*
* 25.11.2008, created --Sampo
* 4.10.2010, added -s and ss modes, as well as -i N selector --Sampo
* 25.1.2011, added -wsc and -wsp validation options --Sampo
*/
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include "platform.h"
#include "errmac.h"
#include "zx.h"
#include "zxid.h"
#include "zxidpriv.h"
#include "zxidutil.h"
#include "zxidconf.h"
#include "c/zxidvers.h"
#include "c/zx-ns.h"
#include "c/zx-const.h"
#include "c/zx-data.h"
char* help =
"zxdecode - Decode SAML Redirect and POST Messages R" ZXID_REL "\n\
Copyright (c) 2008-2011 Sampo Kellomaki (sampo@iki.fi), All Rights Reserved.\n\
NO WARRANTY, not even implied warranties. Licensed under Apache License v2.0\n\
See http://www.apache.org/licenses/LICENSE-2.0\n\
Send well researched bug reports to the author. Home: zxid.org\n\
\n\
Usage: zxdecode [options] <message >decoded\n\
-b -B Prevent or force decode base64 step (default auto detects)\n\
-z -Z Prevent or force inflate step (default auto detects)\n\
-i N Pick Nth detected decodable structure, default: 1=first\n\
-s Enable signature validation step (reads config from -c, see below)\n\
-s -s Only validate hashes (check canon), do not fetch meta or check RSA\n\
-c CONF For -s, optional configuration string (default -c PATH=/var/zxid/)\n\
Most of the configuration is read from /var/zxid/zxid.conf\n\
-wscp Call zxid_wsc_prepare_call() on SOAP request\n\
-wspv Call zxid_wsp_validate() on SOAP request\n\
-wspd Call zxid_wsp_decorate() on SOAP response\n\
-wscv Call zxid_wsc_valid_resp() on SOAP response\n\
-sha1 Compute sha1 over input and print as base64. For debugging canon.\n\
-v Verbose messages.\n\
-q Be extra quiet.\n\
-d Turn on debugging.\n\
-h This help message\n\
-- End of options\n\
\n\
Will attempt to detect many layers of encoding. Will hunt for the\n\
relevant input such as SAMLRequest or SAMLResponse in, e.g., log file.\n";
int b64_flag = 2; /* Auto */
int inflate_flag = 2; /* Auto */
int verbose = 1;
int ix = 1;
int sig_flag = 0; /* No sig checking by default. */
int sha1_flag = 0;
char valid_opt = 0;
zxid_conf* cf = 0;
char buf[256*1024];
/* Called by: main x8, zxcall_main, zxcot_main, zxdecode_main */
static void opt(int* argc, char*** argv, char*** env)
{
if (*argc <= 1) return;
while (1) {
++(*argv); --(*argc);
if (!(*argc) || ((*argv)[0][0] != '-')) break; /* normal exit from options loop */
switch ((*argv)[0][1]) {
case '-': if ((*argv)[0][2]) break;
++(*argv); --(*argc);
DD("End of options by --");
return; /* -- ends the options */
case 'c':
switch ((*argv)[0][2]) {
case '\0':
++(*argv); --(*argc);
if ((*argc) < 1) break;
if (!cf)
cf = zxid_new_conf_to_cf(0);
zxid_parse_conf(cf, (*argv)[0]);
continue;
}
break;
case 'd':
switch ((*argv)[0][2]) {
case '\0':
++zx_debug;
continue;
}
break;
case 'i':
switch ((*argv)[0][2]) {
case '\0':
++(*argv); --(*argc);
if ((*argc) < 1) break;
sscanf((*argv)[0], "%i", &ix);
continue;
}
break;
case 's':
switch ((*argv)[0][2]) {
case '\0':
++sig_flag;
if (!cf)
cf = zxid_new_conf_to_cf(0);
continue;
case 'h':
++sha1_flag;
continue;
}
break;
case 'b':
switch ((*argv)[0][2]) {
case '\0':
b64_flag = 0;
continue;
}
break;
case 'B':
switch ((*argv)[0][2]) {
case '\0':
b64_flag = 1;
continue;
}
break;
case 'z':
switch ((*argv)[0][2]) {
case '\0':
inflate_flag = 0;
continue;
}
break;
case 'Z':
switch ((*argv)[0][2]) {
case '\0':
inflate_flag = 1;
continue;
}
break;
case 'w':
switch ((*argv)[0][2]) {
case 's':
switch ((*argv)[0][3]) {
case 'c':
switch ((*argv)[0][4]) {
case 'p':
valid_opt = 'P';
continue;
case 'v':
valid_opt = 'V';
continue;
}
break;
case 'p':
switch ((*argv)[0][4]) {
case 'v':
valid_opt = 'v';
continue;
case 'd':
valid_opt = 'd';
continue;
}
break;
}
break;
}
break;
#if 0
case 'l':
switch ((*argv)[0][2]) {
case 'i':
if (!strcmp((*argv)[0],"-license")) {
extern char* license;
fprintf(stderr, license);
exit(0);
}
break;
}
break;
#endif
case 'q':
switch ((*argv)[0][2]) {
case '\0':
verbose = 0;
continue;
}
break;
case 'v':
switch ((*argv)[0][2]) {
case '\0':
++verbose;
continue;
}
break;
}
/* fall thru means unrecognized flag */
if (*argc)
fprintf(stderr, "Unrecognized flag `%s'\n", (*argv)[0]);
if (verbose>1) {
printf(help);
exit(0);
}
fprintf(stderr, help);
/*fprintf(stderr, "version=0x%06x rel(%s)\n", zxid_version(), zxid_version_str());*/
exit(3);
}
}
/* Called by: zxdecode_main */
static int ws_validations()
{
int ret;
char* nid;
struct zx_str* ss;
zxid_ses sess;
ZERO(&sess, sizeof(sess));
if (!cf)
cf = zxid_new_conf_to_cf(0);
switch (valid_opt) {
case 'P':
ss = zxid_wsc_prepare_call(cf, &sess, 0 /*epr*/, "", buf);
if (!ss)
return 1;
if (verbose)
printf("WSC_PREPARE_CALL(%.*s)\n", ss->len, ss->s);
return 0;
case 'v':
nid = zxid_wsp_validate(cf, &sess, "", buf);
if (!nid)
return 1;
if (verbose)
printf("WSP_VALIDATE OK nid(%s)\n", nid);
return 0;
case 'd':
ss = zxid_wsp_decorate(cf, &sess, "", buf);
if (!ss)
return 1;
if (verbose)
printf("WSP_DECORATE(%.*s)\n", ss->len, ss->s);
return 0;
case 'V':
ret = zxid_wsc_valid_resp(cf, &sess, "", buf);
if (verbose)
printf("WSC_VALID_RESP(%d)\n", ret);
if (ret == 1)
return 0; /* Success */
return 1;
}
return 2;
}
/* Called by: sig_validate */
static int wsse_sec_validate(struct zx_e_Envelope_s* env)
{
int ret;
int n_refs = 0;
struct zxsig_ref refs[ZXID_N_WSF_SIGNED_HEADERS];
struct zx_wsse_Security_s* sec = env->Header->Security;
if (!sec || !sec->Signature) {
ERR("Missing signature on <wsse:Security> %p", sec);
return 8;
}
if (!sec->Signature->SignedInfo || !sec->Signature->SignedInfo->Reference) {
ERR("Malformed signature, missing mandatory SignedInfo(%p) or Reference", sec->Signature->SignedInfo);
return 9;
}
ZERO(refs, sizeof(refs));
n_refs = zxid_hunt_sig_parts(cf, n_refs, refs, sec->Signature->SignedInfo->Reference, env->Header, env->Body);
/*zx_see_elem_ns(cf->ctx, &refs.pop_seen, &resp->gg); *** */
ret = zxsig_validate(cf->ctx, 0, sec->Signature, n_refs, refs);
if (ret == ZXSIG_BAD_CERT) {
INFO("Canon sha1 of <wsse:Security> verified OK %d", ret);
if (verbose)
printf("\nCanon sha1 if <wsse:Security> verified OK %d\n", ret);
} else {
ERR("Response Signature hash validation error. Bad canonicalization? ret=%d",ret);
return 10;
}
if (ret && verbose)
printf("\nSIG Verified OK, zxid_sp_sso_finalize() returned %d\n", ret);
return ret?0:6;
}
/* Called by: decode */
static int sig_validate(int len, char* p)
{
int ret;
zxid_cgi cgi;
zxid_ses ses;
struct zx_root_s* r;
struct zx_sp_Response_s* resp;
struct zx_ns_s* pop_seen = 0;
struct zxsig_ref refs;
zxid_a7n* a7n;
ZERO(&cgi, sizeof(cgi));
ZERO(&ses, sizeof(ses));
r = zx_dec_zx_root(cf->ctx, len, p, "decode");
if (!r) {
ERR("Failed to parse buf(%.*s)", len, p);
return 2;
}
if (r->Response)
resp = r->Response;
else if (r->Envelope && r->Envelope->Body) {
if (r->Envelope->Body->Response)
resp = r->Envelope->Body->Response;
else if (r->Envelope->Body->ArtifactResponse && r->Envelope->Body->ArtifactResponse->Response)
resp = r->Envelope->Body->ArtifactResponse->Response;
else if (r->Envelope->Header && r->Envelope->Header->Security)
return wsse_sec_validate(r->Envelope);
else {
ERR("<e:Envelope> found, but no <sp:Response> element in it %d",0);
return 3;
}
} else {
a7n = zxid_dec_a7n(cf, r->Assertion, r->EncryptedAssertion);
if (a7n) {
INFO("Bare Assertion without Response wrapper detected %p", r->Assertion);
goto got_a7n;
}
ERR("No <sp:Response>, <sa:Assertion>, or <sa:EncryptedAssertion> found buf(%.*s)", len, p);
return 3;
}
/* See zxid_sp_dig_sso_a7n() for similar code. */
if (sig_flag == 2) {
if (!resp->Signature) {
INFO("No signature in Response %d", 0);
} else {
if (!resp->Signature->SignedInfo || !resp->Signature->SignedInfo->Reference) {
ERR("Malformed signature, missing mandatory SignedInfo(%p) or Reference", resp->Signature->SignedInfo);
return 9;
}
ZERO(&refs, sizeof(refs));
refs.sref = resp->Signature->SignedInfo->Reference;
refs.blob = &resp->gg;
refs.pop_seen = pop_seen;
zx_see_elem_ns(cf->ctx, &refs.pop_seen, &resp->gg);
ret = zxsig_validate(cf->ctx, 0, resp->Signature, 1, &refs);
if (ret == ZXSIG_BAD_CERT) {
INFO("Canon sha1 of Response verified OK %d", ret);
if (verbose)
printf("\nCanon sha1 of Response verified OK %d\n", ret);
} else {
ERR("Response Signature hash validation error. Bad canonicalization? ret=%d",ret);
if (sig_flag < 3)
return 10;
}
}
} else {
if (!zxid_chk_sig(cf, &cgi, &ses, &resp->gg, resp->Signature, resp->Issuer, 0, "Response"))
return 4;
}
a7n = zxid_dec_a7n(cf, resp->Assertion, resp->EncryptedAssertion);
if (!a7n) {
ERR("No Assertion found and not anon_ok in SAML Response %d", 0);
return 5;
}
zx_see_elem_ns(cf->ctx, &pop_seen, &resp->gg);
got_a7n:
if (sig_flag == 2) {
if (a7n->Signature && a7n->Signature->SignedInfo && a7n->Signature->SignedInfo->Reference) {
zx_reset_ns_ctx(cf->ctx);
ZERO(&refs, sizeof(refs));
refs.sref = a7n->Signature->SignedInfo->Reference;
refs.blob = &a7n->gg;
refs.pop_seen = pop_seen;
zx_see_elem_ns(cf->ctx, &refs.pop_seen, &a7n->gg);
ret = zxsig_validate(cf->ctx, 0, a7n->Signature, 1, &refs);
if (ret == ZXSIG_BAD_CERT) {
INFO("Canon sha1 of Assertion verified OK %d", ret);
if (ret && verbose)
printf("\nCanon sha1 of Assertion verified OK %d\n", ret);
return 0;
}
ERR("Canon sha1 of Assertion failed to verify ret=%d", ret);
return 11;
} else {
ERR("Assertion does not contain a signature %p", a7n->Signature);
return 7;
}
} else {
ret = zxid_sp_sso_finalize(cf, &cgi, &ses, a7n, pop_seen);
INFO("zxid_sp_sso_finalize() returned %d", ret);
}
if (ret && verbose)
printf("\nSIG Verified OK, zxid_sp_sso_finalize() returned %d\n", ret);
return ret?0:6;
}
/* Called by: zxdecode_main x4 */
static int decode(char* msg, char* q)
{
int len;
char* p;
char* m2;
char* p2;
*q = 0;
D("Original Msg(%s) x=%x", msg, *msg);
if (strchr(msg, '%')) {
p = p2 = msg;
URL_DECODE(p, p2, q);
q = p;
*q = 0;
D("URL Decoded Msg(%s) x=%x", msg, *msg);
} else
p = q;
switch (b64_flag) {
case 0:
D("decode_base64 skipped at user request %d",0);
break;
case 1:
D("decode_base64 foreced at user request %d",0);
b64_dec:
/* msglen = q - msg; */
p = unbase64_raw(msg, q, msg, zx_std_index_64); /* inplace */
*p = 0;
D("Unbase64 Msg(%s) x=%x len=%d (n.b. message data may be binary at this point)", msg, *msg, ((int)(p-msg)));
break;
case 2:
if (*msg == '<') {
D("decode_base64 auto detect no decode due to initial < %p %p", msg, p);
} else {
D("decode_base64 auto detect decode due to initial 0x%x",*msg);
goto b64_dec;
}
break;
}
switch (inflate_flag) {
case 0:
len = p-msg;
p = msg;
D("No decompression by user choice len=%d",len);
break;
case 1:
D("Decompressing... (force) %d",0);
decompress:
p = zx_zlib_raw_inflate(0, p-msg, msg, &len); /* Redir uses compressed payload. */
break;
case 2:
/* Skip whitespace in the beginning and end of the payload to help correct POST detection. */
for (m2 = msg; m2 < p; ++m2)
if (!ONE_OF_4(*m2, ' ', '\t', '\015', '\012'))
break;
for (p2 = p-1; m2 < p2; --p2)
if (!ONE_OF_4(*p2, ' ', '\t', '\015', '\012'))
break;
D("Msg_minus_whitespace(%.*s) start=%x end=%x", ((int)(p2-m2+1)), m2, *m2, *p2);
if (*m2 == '<' && *p2 == '>') { /* POST profiles do not compress the payload */
len = p2 - m2 + 1;
p = m2;
} else {
D("Decompressing... (auto) %d",0);
goto decompress;
}
break;
}
fwrite(p, 1, len, stdout);
if (sig_flag)
return sig_validate(len, p);
return 0;
}
#ifndef zxdecode_main
#define zxdecode_main main
#endif
/* Called by: */
int zxdecode_main(int argc, char** argv, char** env)
{
int got;
char* pp;
char* p;
char* q;
char* lim;
strcpy(zx_instance, "\tzxdec");
opt(&argc, &argv, &env);
read_all_fd(fileno(stdin), buf, sizeof(buf)-1, &got);
buf[got] = 0;
lim = buf+got;
if (sha1_flag) {
p = sha1_safe_base64(buf, got, buf);
*p = 0;
printf("%s\n", buf);
return 0;
}
if (valid_opt) {
return ws_validations();
}
/* Try to detect relevant input, iterating if -i N was specified.
* The detection is supposed to pick SAMLRequest or SAMLResponse from
* middle of HTML form, or from log output. Whatever is convenient. */
for (pp = buf; pp && pp < lim; pp = p+1) {
p = strstr(pp, "SAMLRequest=");
if (p) {
if (--ix) continue;
q = strchr(p, '&');
return decode(p + sizeof("SAMLRequest=")-1, q?q:lim);
}
p = strstr(pp, "SAMLResponse=");
if (p) {
if (--ix) continue;
q = strchr(p, '&');
return decode(p + sizeof("SAMLResponse=")-1, q?q:lim);
}
if (*pp == '<') { /* HTML for POST */
p = strstr(pp, "SAMLRequest");
if (p) {
p += sizeof("SAMLRequest")-1;
} else {
p = strstr(pp, "SAMLResponse");
if (p)
p += sizeof("SAMLResponse")-1;
}
if (p) {
p = strstr(p, "value=");
if (p) {
if (--ix) continue;
p += sizeof("value=")-1;
if (*p == '"') {
++p;
q = strchr(p, '"');
} else {
q = p+strcspn(p, "\" >");
}
return decode(p, q?q:lim);
}
}
}
if (--ix) { p = pp; continue; }
return decode(pp, lim); /* Decode the object identified above. */
}
ERR("No SAMLRequest or SAMLResponse found to decode %p %p %p", buf, pp, lim);
return 1;
}
/* EOF -- zxdecode.c */