5b9c547c07
Major changes are: SAE, Suite B, RFC 7268, EAP-PKE, ACS, and tons of bug fixes. Relnotes: yes
716 lines
17 KiB
C
716 lines
17 KiB
C
/*
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* Hotspot 2.0 OSU client - EST client
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* Copyright (c) 2012-2014, Qualcomm Atheros, Inc.
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*
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* This software may be distributed under the terms of the BSD license.
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* See README for more details.
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*/
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#include "includes.h"
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#include <openssl/err.h>
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#include <openssl/evp.h>
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#include <openssl/pem.h>
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#include <openssl/pkcs7.h>
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#include <openssl/rsa.h>
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#include <openssl/asn1.h>
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#include <openssl/asn1t.h>
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#include <openssl/x509.h>
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#include <openssl/x509v3.h>
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#include "common.h"
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#include "utils/base64.h"
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#include "utils/xml-utils.h"
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#include "utils/http-utils.h"
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#include "osu_client.h"
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static int pkcs7_to_cert(struct hs20_osu_client *ctx, const u8 *pkcs7,
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size_t len, char *pem_file, char *der_file)
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{
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PKCS7 *p7 = NULL;
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const unsigned char *p = pkcs7;
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STACK_OF(X509) *certs;
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int i, num, ret = -1;
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BIO *out = NULL;
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p7 = d2i_PKCS7(NULL, &p, len);
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if (p7 == NULL) {
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wpa_printf(MSG_INFO, "Could not parse PKCS#7 object: %s",
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ERR_error_string(ERR_get_error(), NULL));
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write_result(ctx, "Could not parse PKCS#7 object from EST");
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goto fail;
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}
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switch (OBJ_obj2nid(p7->type)) {
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case NID_pkcs7_signed:
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certs = p7->d.sign->cert;
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break;
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case NID_pkcs7_signedAndEnveloped:
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certs = p7->d.signed_and_enveloped->cert;
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break;
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default:
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certs = NULL;
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break;
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}
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if (!certs || ((num = sk_X509_num(certs)) == 0)) {
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wpa_printf(MSG_INFO, "No certificates found in PKCS#7 object");
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write_result(ctx, "No certificates found in PKCS#7 object");
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goto fail;
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}
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if (der_file) {
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FILE *f = fopen(der_file, "wb");
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if (f == NULL)
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goto fail;
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i2d_X509_fp(f, sk_X509_value(certs, 0));
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fclose(f);
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}
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if (pem_file) {
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out = BIO_new(BIO_s_file());
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if (out == NULL ||
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BIO_write_filename(out, pem_file) <= 0)
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goto fail;
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for (i = 0; i < num; i++) {
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X509 *cert = sk_X509_value(certs, i);
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X509_print(out, cert);
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PEM_write_bio_X509(out, cert);
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BIO_puts(out, "\n");
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}
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}
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ret = 0;
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fail:
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PKCS7_free(p7);
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if (out)
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BIO_free_all(out);
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return ret;
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}
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int est_load_cacerts(struct hs20_osu_client *ctx, const char *url)
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{
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char *buf, *resp;
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size_t buflen;
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unsigned char *pkcs7;
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size_t pkcs7_len, resp_len;
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int res;
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buflen = os_strlen(url) + 100;
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buf = os_malloc(buflen);
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if (buf == NULL)
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return -1;
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os_snprintf(buf, buflen, "%s/cacerts", url);
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wpa_printf(MSG_INFO, "Download EST cacerts from %s", buf);
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write_summary(ctx, "Download EST cacerts from %s", buf);
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ctx->no_osu_cert_validation = 1;
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http_ocsp_set(ctx->http, 1);
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res = http_download_file(ctx->http, buf, "Cert/est-cacerts.txt",
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ctx->ca_fname);
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http_ocsp_set(ctx->http,
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(ctx->workarounds & WORKAROUND_OCSP_OPTIONAL) ? 1 : 2);
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ctx->no_osu_cert_validation = 0;
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if (res < 0) {
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wpa_printf(MSG_INFO, "Failed to download EST cacerts from %s",
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buf);
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write_result(ctx, "Failed to download EST cacerts from %s",
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buf);
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os_free(buf);
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return -1;
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}
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os_free(buf);
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resp = os_readfile("Cert/est-cacerts.txt", &resp_len);
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if (resp == NULL) {
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wpa_printf(MSG_INFO, "Could not read Cert/est-cacerts.txt");
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write_result(ctx, "Could not read EST cacerts");
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return -1;
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}
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pkcs7 = base64_decode((unsigned char *) resp, resp_len, &pkcs7_len);
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if (pkcs7 && pkcs7_len < resp_len / 2) {
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wpa_printf(MSG_INFO, "Too short base64 decode (%u bytes; downloaded %u bytes) - assume this was binary",
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(unsigned int) pkcs7_len, (unsigned int) resp_len);
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os_free(pkcs7);
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pkcs7 = NULL;
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}
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if (pkcs7 == NULL) {
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wpa_printf(MSG_INFO, "EST workaround - Could not decode base64, assume this is DER encoded PKCS7");
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pkcs7 = os_malloc(resp_len);
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if (pkcs7) {
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os_memcpy(pkcs7, resp, resp_len);
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pkcs7_len = resp_len;
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}
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}
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os_free(resp);
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if (pkcs7 == NULL) {
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wpa_printf(MSG_INFO, "Could not fetch PKCS7 cacerts");
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write_result(ctx, "Could not fetch EST PKCS#7 cacerts");
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return -1;
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}
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res = pkcs7_to_cert(ctx, pkcs7, pkcs7_len, "Cert/est-cacerts.pem",
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NULL);
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os_free(pkcs7);
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if (res < 0) {
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wpa_printf(MSG_INFO, "Could not parse CA certs from PKCS#7 cacerts response");
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write_result(ctx, "Could not parse CA certs from EST PKCS#7 cacerts response");
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return -1;
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}
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unlink("Cert/est-cacerts.txt");
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return 0;
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}
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/*
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* CsrAttrs ::= SEQUENCE SIZE (0..MAX) OF AttrOrOID
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*
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* AttrOrOID ::= CHOICE {
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* oid OBJECT IDENTIFIER,
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* attribute Attribute }
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*
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* Attribute ::= SEQUENCE {
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* type OBJECT IDENTIFIER,
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* values SET SIZE(1..MAX) OF OBJECT IDENTIFIER }
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*/
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typedef struct {
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ASN1_OBJECT *type;
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STACK_OF(ASN1_OBJECT) *values;
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} Attribute;
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typedef struct {
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int type;
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union {
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ASN1_OBJECT *oid;
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Attribute *attribute;
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} d;
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} AttrOrOID;
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typedef struct {
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int type;
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STACK_OF(AttrOrOID) *attrs;
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} CsrAttrs;
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ASN1_SEQUENCE(Attribute) = {
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ASN1_SIMPLE(Attribute, type, ASN1_OBJECT),
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ASN1_SET_OF(Attribute, values, ASN1_OBJECT)
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} ASN1_SEQUENCE_END(Attribute);
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ASN1_CHOICE(AttrOrOID) = {
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ASN1_SIMPLE(AttrOrOID, d.oid, ASN1_OBJECT),
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ASN1_SIMPLE(AttrOrOID, d.attribute, Attribute)
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} ASN1_CHOICE_END(AttrOrOID);
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ASN1_CHOICE(CsrAttrs) = {
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ASN1_SEQUENCE_OF(CsrAttrs, attrs, AttrOrOID)
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} ASN1_CHOICE_END(CsrAttrs);
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IMPLEMENT_ASN1_FUNCTIONS(CsrAttrs);
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static void add_csrattrs_oid(struct hs20_osu_client *ctx, ASN1_OBJECT *oid,
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STACK_OF(X509_EXTENSION) *exts)
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{
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char txt[100];
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int res;
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if (!oid)
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return;
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res = OBJ_obj2txt(txt, sizeof(txt), oid, 1);
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if (res < 0 || res >= (int) sizeof(txt))
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return;
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if (os_strcmp(txt, "1.2.840.113549.1.9.7") == 0) {
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wpa_printf(MSG_INFO, "TODO: csrattr challengePassword");
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} else if (os_strcmp(txt, "1.2.840.113549.1.1.11") == 0) {
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wpa_printf(MSG_INFO, "csrattr sha256WithRSAEncryption");
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} else {
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wpa_printf(MSG_INFO, "Ignore unsupported csrattr oid %s", txt);
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}
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}
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static void add_csrattrs_ext_req(struct hs20_osu_client *ctx,
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STACK_OF(ASN1_OBJECT) *values,
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STACK_OF(X509_EXTENSION) *exts)
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{
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char txt[100];
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int i, num, res;
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num = sk_ASN1_OBJECT_num(values);
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for (i = 0; i < num; i++) {
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ASN1_OBJECT *oid = sk_ASN1_OBJECT_value(values, i);
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res = OBJ_obj2txt(txt, sizeof(txt), oid, 1);
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if (res < 0 || res >= (int) sizeof(txt))
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continue;
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if (os_strcmp(txt, "1.3.6.1.1.1.1.22") == 0) {
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wpa_printf(MSG_INFO, "TODO: extReq macAddress");
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} else if (os_strcmp(txt, "1.3.6.1.4.1.40808.1.1.3") == 0) {
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wpa_printf(MSG_INFO, "TODO: extReq imei");
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} else if (os_strcmp(txt, "1.3.6.1.4.1.40808.1.1.4") == 0) {
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wpa_printf(MSG_INFO, "TODO: extReq meid");
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} else if (os_strcmp(txt, "1.3.6.1.4.1.40808.1.1.5") == 0) {
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wpa_printf(MSG_INFO, "TODO: extReq DevId");
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} else {
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wpa_printf(MSG_INFO, "Ignore unsupported cstattr extensionsRequest %s",
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txt);
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}
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}
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}
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static void add_csrattrs_attr(struct hs20_osu_client *ctx, Attribute *attr,
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STACK_OF(X509_EXTENSION) *exts)
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{
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char txt[100], txt2[100];
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int i, num, res;
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if (!attr || !attr->type || !attr->values)
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return;
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res = OBJ_obj2txt(txt, sizeof(txt), attr->type, 1);
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if (res < 0 || res >= (int) sizeof(txt))
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return;
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if (os_strcmp(txt, "1.2.840.113549.1.9.14") == 0) {
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add_csrattrs_ext_req(ctx, attr->values, exts);
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return;
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}
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num = sk_ASN1_OBJECT_num(attr->values);
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for (i = 0; i < num; i++) {
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ASN1_OBJECT *oid = sk_ASN1_OBJECT_value(attr->values, i);
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res = OBJ_obj2txt(txt2, sizeof(txt2), oid, 1);
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if (res < 0 || res >= (int) sizeof(txt2))
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continue;
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wpa_printf(MSG_INFO, "Ignore unsupported cstattr::attr %s oid %s",
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txt, txt2);
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}
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}
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static void add_csrattrs(struct hs20_osu_client *ctx, CsrAttrs *csrattrs,
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STACK_OF(X509_EXTENSION) *exts)
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{
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int i, num;
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if (!csrattrs || ! csrattrs->attrs)
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return;
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num = SKM_sk_num(AttrOrOID, csrattrs->attrs);
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for (i = 0; i < num; i++) {
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AttrOrOID *ao = SKM_sk_value(AttrOrOID, csrattrs->attrs, i);
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switch (ao->type) {
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case 0:
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add_csrattrs_oid(ctx, ao->d.oid, exts);
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break;
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case 1:
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add_csrattrs_attr(ctx, ao->d.attribute, exts);
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break;
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}
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}
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}
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static int generate_csr(struct hs20_osu_client *ctx, char *key_pem,
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char *csr_pem, char *est_req, char *old_cert,
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CsrAttrs *csrattrs)
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{
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EVP_PKEY_CTX *pctx = NULL;
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EVP_PKEY *pkey = NULL;
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RSA *rsa;
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X509_REQ *req = NULL;
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int ret = -1;
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unsigned int val;
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X509_NAME *subj = NULL;
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char name[100];
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STACK_OF(X509_EXTENSION) *exts = NULL;
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X509_EXTENSION *ex;
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BIO *out;
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wpa_printf(MSG_INFO, "Generate RSA private key");
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write_summary(ctx, "Generate RSA private key");
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pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_RSA, NULL);
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if (!pctx)
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return -1;
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if (EVP_PKEY_keygen_init(pctx) <= 0)
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goto fail;
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if (EVP_PKEY_CTX_set_rsa_keygen_bits(pctx, 2048) <= 0)
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goto fail;
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if (EVP_PKEY_keygen(pctx, &pkey) <= 0)
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goto fail;
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EVP_PKEY_CTX_free(pctx);
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pctx = NULL;
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rsa = EVP_PKEY_get1_RSA(pkey);
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if (rsa == NULL)
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goto fail;
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if (key_pem) {
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FILE *f = fopen(key_pem, "wb");
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if (f == NULL)
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goto fail;
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if (!PEM_write_RSAPrivateKey(f, rsa, NULL, NULL, 0, NULL,
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NULL)) {
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wpa_printf(MSG_INFO, "Could not write private key: %s",
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ERR_error_string(ERR_get_error(), NULL));
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fclose(f);
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goto fail;
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}
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fclose(f);
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}
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wpa_printf(MSG_INFO, "Generate CSR");
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write_summary(ctx, "Generate CSR");
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req = X509_REQ_new();
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if (req == NULL)
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goto fail;
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if (old_cert) {
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FILE *f;
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X509 *cert;
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int res;
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f = fopen(old_cert, "r");
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if (f == NULL)
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goto fail;
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cert = PEM_read_X509(f, NULL, NULL, NULL);
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fclose(f);
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if (cert == NULL)
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goto fail;
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res = X509_REQ_set_subject_name(req,
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X509_get_subject_name(cert));
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X509_free(cert);
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if (!res)
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goto fail;
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} else {
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os_get_random((u8 *) &val, sizeof(val));
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os_snprintf(name, sizeof(name), "cert-user-%u", val);
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subj = X509_NAME_new();
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if (subj == NULL ||
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!X509_NAME_add_entry_by_txt(subj, "CN", MBSTRING_ASC,
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(unsigned char *) name,
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-1, -1, 0) ||
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!X509_REQ_set_subject_name(req, subj))
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goto fail;
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X509_NAME_free(subj);
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subj = NULL;
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}
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if (!X509_REQ_set_pubkey(req, pkey))
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goto fail;
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exts = sk_X509_EXTENSION_new_null();
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if (!exts)
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goto fail;
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ex = X509V3_EXT_conf_nid(NULL, NULL, NID_basic_constraints,
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"CA:FALSE");
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if (ex == NULL ||
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!sk_X509_EXTENSION_push(exts, ex))
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goto fail;
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ex = X509V3_EXT_conf_nid(NULL, NULL, NID_key_usage,
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"nonRepudiation,digitalSignature,keyEncipherment");
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if (ex == NULL ||
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!sk_X509_EXTENSION_push(exts, ex))
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goto fail;
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ex = X509V3_EXT_conf_nid(NULL, NULL, NID_ext_key_usage,
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"1.3.6.1.4.1.40808.1.1.2");
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if (ex == NULL ||
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!sk_X509_EXTENSION_push(exts, ex))
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goto fail;
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add_csrattrs(ctx, csrattrs, exts);
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if (!X509_REQ_add_extensions(req, exts))
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goto fail;
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sk_X509_EXTENSION_pop_free(exts, X509_EXTENSION_free);
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exts = NULL;
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if (!X509_REQ_sign(req, pkey, EVP_sha256()))
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goto fail;
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out = BIO_new(BIO_s_mem());
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if (out) {
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char *txt;
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size_t rlen;
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X509_REQ_print(out, req);
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rlen = BIO_ctrl_pending(out);
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txt = os_malloc(rlen + 1);
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if (txt) {
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int res = BIO_read(out, txt, rlen);
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if (res > 0) {
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txt[res] = '\0';
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wpa_printf(MSG_MSGDUMP, "OpenSSL: Certificate request:\n%s",
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txt);
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}
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os_free(txt);
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}
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BIO_free(out);
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}
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if (csr_pem) {
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FILE *f = fopen(csr_pem, "w");
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if (f == NULL)
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goto fail;
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X509_REQ_print_fp(f, req);
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if (!PEM_write_X509_REQ(f, req)) {
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fclose(f);
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goto fail;
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}
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fclose(f);
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}
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if (est_req) {
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BIO *mem = BIO_new(BIO_s_mem());
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BUF_MEM *ptr;
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char *pos, *end, *buf_end;
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FILE *f;
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if (mem == NULL)
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goto fail;
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if (!PEM_write_bio_X509_REQ(mem, req)) {
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BIO_free(mem);
|
|
goto fail;
|
|
}
|
|
|
|
BIO_get_mem_ptr(mem, &ptr);
|
|
pos = ptr->data;
|
|
buf_end = pos + ptr->length;
|
|
|
|
/* Remove START/END lines */
|
|
while (pos < buf_end && *pos != '\n')
|
|
pos++;
|
|
if (pos == buf_end) {
|
|
BIO_free(mem);
|
|
goto fail;
|
|
}
|
|
pos++;
|
|
|
|
end = pos;
|
|
while (end < buf_end && *end != '-')
|
|
end++;
|
|
|
|
f = fopen(est_req, "w");
|
|
if (f == NULL) {
|
|
BIO_free(mem);
|
|
goto fail;
|
|
}
|
|
fwrite(pos, end - pos, 1, f);
|
|
fclose(f);
|
|
|
|
BIO_free(mem);
|
|
}
|
|
|
|
ret = 0;
|
|
fail:
|
|
if (exts)
|
|
sk_X509_EXTENSION_pop_free(exts, X509_EXTENSION_free);
|
|
if (subj)
|
|
X509_NAME_free(subj);
|
|
if (req)
|
|
X509_REQ_free(req);
|
|
if (pkey)
|
|
EVP_PKEY_free(pkey);
|
|
if (pctx)
|
|
EVP_PKEY_CTX_free(pctx);
|
|
return ret;
|
|
}
|
|
|
|
|
|
int est_build_csr(struct hs20_osu_client *ctx, const char *url)
|
|
{
|
|
char *buf;
|
|
size_t buflen;
|
|
int res;
|
|
char old_cert_buf[200];
|
|
char *old_cert = NULL;
|
|
CsrAttrs *csrattrs = NULL;
|
|
|
|
buflen = os_strlen(url) + 100;
|
|
buf = os_malloc(buflen);
|
|
if (buf == NULL)
|
|
return -1;
|
|
|
|
os_snprintf(buf, buflen, "%s/csrattrs", url);
|
|
wpa_printf(MSG_INFO, "Download csrattrs from %s", buf);
|
|
write_summary(ctx, "Download EST csrattrs from %s", buf);
|
|
ctx->no_osu_cert_validation = 1;
|
|
http_ocsp_set(ctx->http, 1);
|
|
res = http_download_file(ctx->http, buf, "Cert/est-csrattrs.txt",
|
|
ctx->ca_fname);
|
|
http_ocsp_set(ctx->http,
|
|
(ctx->workarounds & WORKAROUND_OCSP_OPTIONAL) ? 1 : 2);
|
|
ctx->no_osu_cert_validation = 0;
|
|
os_free(buf);
|
|
if (res < 0) {
|
|
wpa_printf(MSG_INFO, "Failed to download EST csrattrs - assume no extra attributes are needed");
|
|
} else {
|
|
size_t resp_len;
|
|
char *resp;
|
|
unsigned char *attrs;
|
|
const unsigned char *pos;
|
|
size_t attrs_len;
|
|
|
|
resp = os_readfile("Cert/est-csrattrs.txt", &resp_len);
|
|
if (resp == NULL) {
|
|
wpa_printf(MSG_INFO, "Could not read csrattrs");
|
|
return -1;
|
|
}
|
|
|
|
attrs = base64_decode((unsigned char *) resp, resp_len,
|
|
&attrs_len);
|
|
os_free(resp);
|
|
|
|
if (attrs == NULL) {
|
|
wpa_printf(MSG_INFO, "Could not base64 decode csrattrs");
|
|
return -1;
|
|
}
|
|
unlink("Cert/est-csrattrs.txt");
|
|
|
|
pos = attrs;
|
|
csrattrs = d2i_CsrAttrs(NULL, &pos, attrs_len);
|
|
os_free(attrs);
|
|
if (csrattrs == NULL) {
|
|
wpa_printf(MSG_INFO, "Failed to parse csrattrs ASN.1");
|
|
/* Continue assuming no additional requirements */
|
|
}
|
|
}
|
|
|
|
if (ctx->client_cert_present) {
|
|
os_snprintf(old_cert_buf, sizeof(old_cert_buf),
|
|
"SP/%s/client-cert.pem", ctx->fqdn);
|
|
old_cert = old_cert_buf;
|
|
}
|
|
|
|
res = generate_csr(ctx, "Cert/privkey-plain.pem", "Cert/est-req.pem",
|
|
"Cert/est-req.b64", old_cert, csrattrs);
|
|
if (csrattrs)
|
|
CsrAttrs_free(csrattrs);
|
|
|
|
return res;
|
|
}
|
|
|
|
|
|
int est_simple_enroll(struct hs20_osu_client *ctx, const char *url,
|
|
const char *user, const char *pw)
|
|
{
|
|
char *buf, *resp, *req, *req2;
|
|
size_t buflen, resp_len, len, pkcs7_len;
|
|
unsigned char *pkcs7;
|
|
FILE *f;
|
|
char client_cert_buf[200];
|
|
char client_key_buf[200];
|
|
const char *client_cert = NULL, *client_key = NULL;
|
|
int res;
|
|
|
|
req = os_readfile("Cert/est-req.b64", &len);
|
|
if (req == NULL) {
|
|
wpa_printf(MSG_INFO, "Could not read Cert/req.b64");
|
|
return -1;
|
|
}
|
|
req2 = os_realloc(req, len + 1);
|
|
if (req2 == NULL) {
|
|
os_free(req);
|
|
return -1;
|
|
}
|
|
req2[len] = '\0';
|
|
req = req2;
|
|
wpa_printf(MSG_DEBUG, "EST simpleenroll request: %s", req);
|
|
|
|
buflen = os_strlen(url) + 100;
|
|
buf = os_malloc(buflen);
|
|
if (buf == NULL) {
|
|
os_free(req);
|
|
return -1;
|
|
}
|
|
|
|
if (ctx->client_cert_present) {
|
|
os_snprintf(buf, buflen, "%s/simplereenroll", url);
|
|
os_snprintf(client_cert_buf, sizeof(client_cert_buf),
|
|
"SP/%s/client-cert.pem", ctx->fqdn);
|
|
client_cert = client_cert_buf;
|
|
os_snprintf(client_key_buf, sizeof(client_key_buf),
|
|
"SP/%s/client-key.pem", ctx->fqdn);
|
|
client_key = client_key_buf;
|
|
} else
|
|
os_snprintf(buf, buflen, "%s/simpleenroll", url);
|
|
wpa_printf(MSG_INFO, "EST simpleenroll URL: %s", buf);
|
|
write_summary(ctx, "EST simpleenroll URL: %s", buf);
|
|
ctx->no_osu_cert_validation = 1;
|
|
http_ocsp_set(ctx->http, 1);
|
|
resp = http_post(ctx->http, buf, req, "application/pkcs10",
|
|
"Content-Transfer-Encoding: base64",
|
|
ctx->ca_fname, user, pw, client_cert, client_key,
|
|
&resp_len);
|
|
http_ocsp_set(ctx->http,
|
|
(ctx->workarounds & WORKAROUND_OCSP_OPTIONAL) ? 1 : 2);
|
|
ctx->no_osu_cert_validation = 0;
|
|
os_free(buf);
|
|
if (resp == NULL) {
|
|
wpa_printf(MSG_INFO, "EST certificate enrollment failed");
|
|
write_result(ctx, "EST certificate enrollment failed");
|
|
return -1;
|
|
}
|
|
wpa_printf(MSG_DEBUG, "EST simpleenroll response: %s", resp);
|
|
f = fopen("Cert/est-resp.raw", "w");
|
|
if (f) {
|
|
fwrite(resp, resp_len, 1, f);
|
|
fclose(f);
|
|
}
|
|
|
|
pkcs7 = base64_decode((unsigned char *) resp, resp_len, &pkcs7_len);
|
|
if (pkcs7 == NULL) {
|
|
wpa_printf(MSG_INFO, "EST workaround - Could not decode base64, assume this is DER encoded PKCS7");
|
|
pkcs7 = os_malloc(resp_len);
|
|
if (pkcs7) {
|
|
os_memcpy(pkcs7, resp, resp_len);
|
|
pkcs7_len = resp_len;
|
|
}
|
|
}
|
|
os_free(resp);
|
|
|
|
if (pkcs7 == NULL) {
|
|
wpa_printf(MSG_INFO, "Failed to parse simpleenroll base64 response");
|
|
write_result(ctx, "Failed to parse EST simpleenroll base64 response");
|
|
return -1;
|
|
}
|
|
|
|
res = pkcs7_to_cert(ctx, pkcs7, pkcs7_len, "Cert/est_cert.pem",
|
|
"Cert/est_cert.der");
|
|
os_free(pkcs7);
|
|
|
|
if (res < 0) {
|
|
wpa_printf(MSG_INFO, "EST: Failed to extract certificate from PKCS7 file");
|
|
write_result(ctx, "EST: Failed to extract certificate from EST PKCS7 file");
|
|
return -1;
|
|
}
|
|
|
|
wpa_printf(MSG_INFO, "EST simple%senroll completed successfully",
|
|
ctx->client_cert_present ? "re" : "");
|
|
write_summary(ctx, "EST simple%senroll completed successfully",
|
|
ctx->client_cert_present ? "re" : "");
|
|
|
|
return 0;
|
|
}
|