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stir_shaken.c
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stir_shaken.c
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/*
* Copyright (C) 2019 OpenSIPS Solutions
*
* This file is part of opensips, a free SIP server.
*
* opensips is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*
* opensips is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*
*/
#define _GNU_SOURCE
#define _XOPEN_SOURCE 600 /* glibc2 on linux, bsd */
#define _XOPEN_SOURCE_EXTENDED 1 /* solaris */
/**
* _XOPEN_SOURCE creates conflict in swab definition in Solaris
*/
#ifdef __OS_solaris
#undef _XOPEN_SOURCE
#endif
#include <time.h>
#undef _XOPEN_SOURCE
#undef _XOPEN_SOURCE_EXTENDED
#include <openssl/x509.h>
#undef _GNU_SOURCE
#include <openssl/x509v3.h>
#include <openssl/pem.h>
#include <openssl/err.h>
#include <stdlib.h>
#include "../../dprint.h"
#include "../../sr_module.h"
#include "../../ut.h"
#include "../../parser/msg_parser.h"
#include "../../parser/parse_pai.h"
#include "../../parser/parse_from.h"
#include "../../parser/parse_to.h"
#include "../../parser/parse_uri.h"
#include "../../parser/parse_param.h"
#include "../../data_lump.h"
#include "../../lib/cJSON.h"
#include "../../context.h"
#include "stir_shaken.h"
#define parsed_ctx_get() \
(current_processing_ctx == NULL ? NULL : \
((struct parsed_identity *)context_get_ptr(CONTEXT_GLOBAL, \
current_processing_ctx, parsed_ctx_idx)))
#define parsed_ctx_set(_ptr) \
context_put_ptr(CONTEXT_GLOBAL, current_processing_ctx, parsed_ctx_idx, _ptr)
static int mod_init(void);
static void mod_destroy(void);
static int w_stir_auth(struct sip_msg *msg, str *attest, str *origid,
str *cert_buf, str *pkey_buf, str *cr_url, str *orig_tn_p, str *dest_tn_p);
static int w_stir_verify(struct sip_msg *msg, str *cert_buf,
pv_spec_t *err_code, pv_spec_t *err_reason, str *orig_tn_p, str *dest_tn_p);
static int w_stir_check(struct sip_msg *msg);
static int w_stir_check_cert(struct sip_msg *msg, str *cert_buf);
static int fixup_attest(void **param);
static int fixup_check_wrvar(void **param);
int pv_get_identity(struct sip_msg *msg, pv_param_t *param, pv_value_t *res);
int pv_parse_identity_name(pv_spec_p sp, str *in);
static int auth_date_freshness = DEFAULT_AUTH_FRESHNESS;
static int verify_date_freshness = DEFAULT_VERIFY_FRESHNESS;
static char *ca_list;
static char *ca_dir;
static char *crl_list;
static char *crl_dir;
static int e164_strict_mode;
static int require_date_hdr = 1;
static int tn_authlist_nid;
static int parsed_ctx_idx =-1;
static X509_STORE *store;
static param_export_t params[] = {
{"auth_date_freshness", INT_PARAM, &auth_date_freshness},
{"verify_date_freshness", INT_PARAM, &verify_date_freshness},
{"ca_list", STR_PARAM, &ca_list},
{"ca_dir", STR_PARAM, &ca_dir},
{"crl_list", STR_PARAM, &crl_list},
{"crl_dir", STR_PARAM, &crl_dir},
{"e164_strict_mode", INT_PARAM, &e164_strict_mode},
{"require_date_hdr", INT_PARAM, &require_date_hdr},
{0, 0, 0}
};
static pv_export_t mod_items[] = {
{{"identity", sizeof("identity") - 1}, 1000, pv_get_identity,
0, pv_parse_identity_name, 0, 0, 0},
{ {0, 0}, 0, 0, 0, 0, 0, 0, 0 }
};
static cmd_export_t cmds[] = {
{"stir_shaken_auth", (cmd_function)w_stir_auth, {
{CMD_PARAM_STR, fixup_attest, 0},
{CMD_PARAM_STR, 0, 0},
{CMD_PARAM_STR, 0, 0},
{CMD_PARAM_STR, 0, 0},
{CMD_PARAM_STR, 0, 0},
{CMD_PARAM_STR|CMD_PARAM_OPT, 0, 0},
{CMD_PARAM_STR|CMD_PARAM_OPT, 0, 0}, {0,0,0}},
REQUEST_ROUTE},
{"stir_shaken_verify", (cmd_function)w_stir_verify, {
{CMD_PARAM_STR, 0, 0},
{CMD_PARAM_VAR, fixup_check_wrvar, 0},
{CMD_PARAM_VAR, fixup_check_wrvar, 0},
{CMD_PARAM_STR|CMD_PARAM_OPT, 0, 0},
{CMD_PARAM_STR|CMD_PARAM_OPT, 0, 0}, {0,0,0}},
REQUEST_ROUTE},
{"stir_shaken_check", (cmd_function)w_stir_check,
{{0,0,0}}, REQUEST_ROUTE},
{"stir_shaken_check_cert", (cmd_function)w_stir_check_cert, {
{CMD_PARAM_STR, 0, 0},
{0,0,0}}, REQUEST_ROUTE},
{0,0,{{0,0,0}},0}
};
struct module_exports exports = {
"stir_shaken", /* module name*/
MOD_TYPE_DEFAULT, /* class of this module */
MODULE_VERSION,
DEFAULT_DLFLAGS, /* dlopen flags */
0, /* load function */
0, /* OpenSIPS module dependencies */
cmds, /* exported functions */
0, /* exported async functions */
params, /* module parameters */
0, /* exported statistics */
0, /* exported MI functions */
mod_items, /* exported pseudo-variables */
0, /* exported transformations */
0, /* extra processes */
0, /* module pre-initialization function */
mod_init, /* module initialization function */
0, /* response function */
mod_destroy,/* destroy function */
0, /* per-child init function */
0 /* reload confirm function */
};
static int verify_callback(int ok, X509_STORE_CTX *ctx)
{
int err;
if (!ok) {
err = X509_STORE_CTX_get_error(ctx);
LM_INFO("certificate validation failed: %s\n",
X509_verify_cert_error_string(err));
}
return ok;
}
static int init_cert_validation(void)
{
store = X509_STORE_new();
if (!store) {
LM_ERR("Failed to create X509_STORE_CTX object\n");
return -1;
}
X509_STORE_set_verify_cb_func(store, verify_callback);
if (ca_list || ca_dir) {
if (X509_STORE_load_locations(store, ca_list, ca_dir) != 1) {
LM_ERR("Failed to load trustefd CAs\n");
return -1;
}
if (X509_STORE_set_default_paths(store) != 1) {
LM_ERR("Failed to loade the system-wide CA certificates\n");
return -1;
}
}
if (crl_list || crl_dir) {
if (X509_STORE_load_locations(store, crl_list, crl_dir) != 1) {
LM_ERR("Failed to load CRLs\n");
return -1;
}
X509_STORE_set_flags(store,
X509_V_FLAG_CRL_CHECK | X509_V_FLAG_CRL_CHECK_ALL);
}
return 0;
}
static void parsed_ctx_free(void *param)
{
struct parsed_identity *parsed = (struct parsed_identity *)param;
if (parsed) {
cJSON_Delete(parsed->header);
cJSON_Delete(parsed->payload);
pkg_free(parsed->dec_header.s);
pkg_free(parsed->dec_payload.s);
pkg_free(parsed->dec_signature.s);
}
pkg_free(parsed);
}
static int mod_init(void)
{
tn_authlist_nid = OBJ_create(TN_AUTH_LIST_OID,
TN_AUTH_LIST_SN, TN_AUTH_LIST_LN);
if (tn_authlist_nid == NID_undef) {
LM_ERR("Failed to create new openssl object\n");
return -1;
}
if (init_cert_validation() < 0)
return -1;
parsed_ctx_idx = context_register_ptr(CONTEXT_GLOBAL, parsed_ctx_free);
return 0;
}
static void mod_destroy(void) {
#if OPENSSL_VERSION_NUMBER < 0x10100000L
OBJ_cleanup();
#endif
return;
}
static int fixup_check_wrvar(void** param)
{
if (((pv_spec_t *)*param)->setf == NULL) {
LM_ERR("Output parameter must be a writable variable\n");
return E_CFG;
}
return 0;
}
static int fixup_attest(void **param)
{
str *s = (str*)*param;
if (!str_strcasecmp(s, _str("A")) || !str_strcasecmp(s, _str("full")))
init_str(s, FULL_ATTEST_STR);
else if (!str_strcasecmp(s, _str("B")) || !str_strcasecmp(s, _str("partial")))
init_str(s, PARTIAL_ATTEST_STR);
else if (!str_strcasecmp(s, _str("C")) || !str_strcasecmp(s, _str("gateway")))
init_str(s, GATEWAY_ATTEST_STR);
else {
LM_ERR("Bad attestation level\n");
return -1;
}
return 0;
}
static int get_date_ts(struct hdr_field *date_hf, time_t *date_ts)
{
char date_s[DATE_MAX_LEN];
char *tz;
struct tm date_tm;
if (date_hf->body.len >= DATE_MAX_LEN) {
LM_ERR("Date header field to long\n");
return -1;
}
memcpy(date_s, date_hf->body.s, date_hf->body.len);
date_s[date_hf->body.len] = 0;
memset(&date_tm, 0, sizeof date_tm);
if (!strptime(date_s, DATE_FORMAT, &date_tm)) {
LM_ERR("Failed to parse Date header field\n");
return -1;
}
tz = getenv("TZ");
setenv("TZ", "", 1);
tzset();
*date_ts = mktime(&date_tm);
if (tz)
setenv("TZ", tz, 1);
else
unsetenv("TZ");
tzset();
if (*date_ts == -1) {
LM_ERR("Failed convert to UNIX time\n");
return -1;
}
return 0;
}
static int add_date_hf(struct sip_msg *msg, time_t *date_ts)
{
#define DATE_HDR_S "Date: "
#define DATE_HDR_L (sizeof(DATE_HDR_S)-1)
struct tm *date_tm;
char *buf;
int len;
struct lump* anchor;
date_tm = gmtime(date_ts);
if (!date_tm) {
LM_ERR("Failed to convert timestamp to broken-down time\n");
return -1;
}
buf = pkg_malloc(DATE_HDR_L + DATE_MAX_LEN + CRLF_LEN);
if (!buf) {
LM_ERR("oom!\n");
return -1;
}
memcpy(buf, DATE_HDR_S, DATE_HDR_L);
len = strftime(buf + DATE_HDR_L, DATE_MAX_LEN, DATE_FORMAT, date_tm);
if (len == 0) {
LM_ERR("Failed to format date\n");
pkg_free(buf);
return -1;
}
memcpy(buf + DATE_HDR_L + len, CRLF, CRLF_LEN);
anchor = anchor_lump(msg, msg->unparsed - msg->buf, 0);
if (!anchor) {
LM_ERR("Failed to get anchor lump\n");
return -1;
}
if (!insert_new_lump_before(anchor, buf, DATE_HDR_L+len+CRLF_LEN, 0)) {
LM_ERR("Failed to insert lump\n");
return -1;
}
return 0;
}
static int check_cert_validity(time_t *timestamp, X509 *cert)
{
ASN1_STRING *notBeforeSt;
ASN1_STRING *notAfterSt;
notBeforeSt = X509_get_notBefore(cert);
notAfterSt = X509_get_notAfter(cert);
if (!notBeforeSt || !notAfterSt) {
LM_ERR("failed to parse certificate validity\n");
return 0;
}
if (X509_cmp_time(notBeforeSt, timestamp) < 0 &&
X509_cmp_time(notAfterSt, timestamp) > 0)
return 1;
return 0;
}
static char *build_pport_hdr_json(str *cr_url)
{
char *json_str;
cJSON *header, *item;
header = cJSON_CreateObject();
if (!header) {
LM_ERR("Failed to create json object\n");
return NULL;
}
item = cJSON_CreateString(PPORT_HDR_ALG_VAL);
if (!item) {
LM_ERR("Failed to add json item\n");
goto error;
}
cJSON_AddItemToObjectCS(header, PPORT_HDR_ALG, item);
item = cJSON_CreateString(PPORT_HDR_PPT_VAL);
if (!item) {
LM_ERR("Failed to add json item\n");
goto error;
}
cJSON_AddItemToObjectCS(header, PPORT_HDR_PPT, item);
item = cJSON_CreateString(PPORT_HDR_TYP_VAL);
if (!item) {
LM_ERR("Failed to add json item\n");
goto error;
}
cJSON_AddItemToObjectCS(header, PPORT_HDR_TYP, item);
item = cJSON_CreateStr(cr_url->s, cr_url->len);
if (!item) {
LM_ERR("Failed to add json item\n");
goto error;
}
cJSON_AddItemToObjectCS(header, PPORT_HDR_X5U, item);
json_str = cJSON_PrintUnformatted(header);
if (!json_str) {
LM_ERR("Failed to print json object\n");
goto error;
}
cJSON_Delete(header);
return json_str;
error:
cJSON_Delete(header);
return NULL;
}
static char *build_pport_payload_json(str *attest, str *orig_tn, str *dest_tn,
time_t iat_ts, str *origid)
{
char *json_str;
cJSON *payload, *item, *tn_item;
payload = cJSON_CreateObject();
if (!payload) {
LM_ERR("Failed to create json object\n");
return NULL;
}
item = cJSON_CreateStr(attest->s, attest->len);
if (!item) {
LM_ERR("Failed to add json item\n");
goto error;
}
cJSON_AddItemToObjectCS(payload, PPORT_PAYLOAD_ATTEST, item);
item = cJSON_CreateObject();
if (!item) {
LM_ERR("Failed to create json object\n");
goto error;
}
cJSON_AddItemToObjectCS(payload, PPORT_PAYLOAD_DEST, item);
tn_item = cJSON_CreateArray();
if (!tn_item) {
LM_ERR("Failed to create json array\n");
goto error;
}
cJSON_AddItemToObjectCS(item, PPORT_PAYLOAD_TN, tn_item);
item = cJSON_CreateStr(dest_tn->s, dest_tn->len);
if (!item) {
LM_ERR("Failed to add json item\n");
goto error;
}
cJSON_AddItemToArray(tn_item, item);
item = cJSON_CreateNumber((double)iat_ts);
if (!item) {
LM_ERR("Failed to add json item\n");
goto error;
}
cJSON_AddItemToObjectCS(payload, PPORT_PAYLOAD_IAT, item);
item = cJSON_CreateObject();
if (!item) {
LM_ERR("Failed to create json object\n");
goto error;
}
cJSON_AddItemToObjectCS(payload, PPORT_PAYLOAD_ORIG, item);
tn_item = cJSON_CreateStr(orig_tn->s, orig_tn->len);
if (!tn_item) {
LM_ERR("Failed to add json item\n");
goto error;
}
cJSON_AddItemToObjectCS(item, PPORT_PAYLOAD_TN, tn_item);
item = cJSON_CreateStr(origid->s, origid->len);
if (!item) {
LM_ERR("Failed to add json item\n");
goto error;
}
cJSON_AddItemToObjectCS(payload, PPORT_PAYLOAD_ORIGID, item);
json_str = cJSON_PrintUnformatted(payload);
if (!json_str) {
LM_ERR("Failed to print json object\n");
goto error;
}
cJSON_Delete(payload);
return json_str;
error:
cJSON_Delete(payload);
return NULL;
}
static int build_unsigned_pport(str *buf, time_t iat_ts, str *attest,
str *cr_url, str *orig_tn, str *dest_tn, str *origid)
{
str hdr_json_str = {0,0}, payload_json_str = {0,0};
hdr_json_str.s = build_pport_hdr_json(cr_url);
if (!hdr_json_str.s) {
LM_ERR("Failed to build PASSporT's json header\n");
return -1;
}
hdr_json_str.len = strlen(hdr_json_str.s);
LM_DBG("Built PASSporT Header: %s\n", hdr_json_str.s);
payload_json_str.s = build_pport_payload_json(attest, orig_tn, dest_tn,
iat_ts, origid);
if (!payload_json_str.s) {
LM_ERR("Failed to build PASSporT's json payload\n");
goto error;
}
payload_json_str.len = strlen(payload_json_str.s);
LM_DBG("Built PASSporT Payload: %s\n", payload_json_str.s);
buf->len = calc_base64_encode_len(hdr_json_str.len) + 1 /* '.' */ +
calc_base64_encode_len(payload_json_str.len);
buf->s = pkg_malloc(buf->len);
if (!buf->s) {
LM_ERR("oom!\n");
goto error;
}
base64urlencode((unsigned char*)buf->s,
(unsigned char*)hdr_json_str.s, hdr_json_str.len);
buf->len = calc_base64_encode_len(hdr_json_str.len);
/* remove base64 padding */
if (buf->s[buf->len-1] == BASE64_PAD_CHAR)
buf->len--;
if (buf->s[buf->len-1] == BASE64_PAD_CHAR)
buf->len--;
buf->s[buf->len++] = PPORT_SEPARATOR;
base64urlencode((unsigned char*)(buf->s + buf->len),
(unsigned char*)payload_json_str.s, payload_json_str.len);
buf->len += calc_base64_encode_len(payload_json_str.len);
if (buf->s[buf->len-1] == BASE64_PAD_CHAR)
buf->len--;
if (buf->s[buf->len-1] == BASE64_PAD_CHAR)
buf->len--;
cJSON_PurgeString(hdr_json_str.s);
cJSON_PurgeString(payload_json_str.s);
return 0;
error:
cJSON_PurgeString(hdr_json_str.s);
if (payload_json_str.s)
cJSON_PurgeString(payload_json_str.s);
return -1;
}
static int get_orig_tn_from_msg(struct sip_msg *msg, str *orig_tn)
{
struct to_body *body;
struct sip_uri parsed_uri;
if (parse_headers(msg, HDR_PAI_F | HDR_FROM_F, 0) < 0) {
LM_ERR("Failed to parse headers\n");
return -1;
}
if (msg->pai) {
if (parse_pai_header(msg) < 0) {
LM_ERR("Unable to parse P-Asserted-Identity header\n");
return -1;
}
body = get_pai(msg);
} else {
if (parse_from_header(msg) < 0) {
LM_ERR("Unable to parse From header\n");
return -1;
}
body = get_from(msg);
}
if (parse_uri(body->uri.s, body->uri.len, &parsed_uri) < 0) {
LM_ERR("Failed to parse %s URI: %.*s\n", msg->pai ? "PAI" : "From",
body->uri.len, body->uri.s);
return -1;
}
if ((parsed_uri.type != SIP_URI_T && parsed_uri.type != TEL_URI_T &&
parsed_uri.type != SIPS_URI_T && parsed_uri.type != TELS_URI_T) ||
(e164_strict_mode &&
(parsed_uri.type == SIP_URI_T || parsed_uri.type == SIPS_URI_T) &&
str_strcmp(&parsed_uri.user_param, _str("user=phone")))) {
LM_ERR("'tel:' URI or 'sip:' URI %srequired\n",
e164_strict_mode ? "with ';user=phone' parameter " : "");
return -3;
}
*orig_tn = parsed_uri.user;
return 0;
}
static int get_dest_tn_from_msg(struct sip_msg *msg, str *dest_tn)
{
struct to_body *body;
struct sip_uri parsed_uri;
if (parse_to_header(msg) < 0) {
LM_ERR("Unable to parse To header\n");
return -1;
}
body = get_to(msg);
if (parse_uri(body->uri.s, body->uri.len, &parsed_uri) < 0) {
LM_ERR("Failed to parse To URI: %.*s\n", body->uri.len, body->uri.s);
return -1;
}
if ((parsed_uri.type != SIP_URI_T && parsed_uri.type != TEL_URI_T &&
parsed_uri.type != SIPS_URI_T && parsed_uri.type != TELS_URI_T) ||
(e164_strict_mode &&
(parsed_uri.type == SIP_URI_T || parsed_uri.type == SIPS_URI_T) &&
str_strcmp(&parsed_uri.user_param, _str("user=phone")))) {
LM_ERR("'tel:' URI or 'sip:' URI %srequired\n",
e164_strict_mode ? "with ';user=phone' parameter " : "");
return -3;
}
*dest_tn = parsed_uri.user;
return 0;
}
/* compatibility function for openssl versions lower than 1.1.0 */
#if OPENSSL_VERSION_NUMBER < 0x10100000L
int BN_bn2binpad(const BIGNUM *a, unsigned char *to, int tolen)
{
int bnlen, padlen;
bnlen = BN_num_bytes(a);
if (tolen < bnlen)
return -1;
padlen = tolen - bnlen;
memset(to, 0, padlen);
if (BN_bn2bin(a, to + padlen) == 0)
return -1;
return tolen;
}
void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps)
{
*pr = sig->r;
*ps = sig->s;
}
#endif
static int add_identity_hf(struct sip_msg *msg, EVP_PKEY *pkey,
time_t date_ts, str *attest, str *cr_url, str *orig_tn,
str *dest_tn, str *origid)
{
str hdr_buf = {0,0};
str unsigned_buf;
str der_sig_buf = {0,0};
unsigned char *der_sig_p;
unsigned char raw_sig_buf[RAW_SIG_LEN];
struct lump* anchor;
EVP_MD_CTX *mdctx = NULL;
ECDSA_SIG *sig = NULL;
const BIGNUM *r, *s;
int len;
if (build_unsigned_pport(&unsigned_buf, date_ts, attest, cr_url,
orig_tn, dest_tn, origid) < 0) {
LM_ERR("Failed to build PASSporT\n");
return -1;
}
mdctx = EVP_MD_CTX_create();
if (!mdctx) {
LM_ERR("Failed to create signing context\n");
goto error;
}
if (EVP_DigestSignInit(mdctx, NULL, EVP_sha256(), NULL, pkey) <= 0) {
LM_ERR("Failed to init signing operation\n");
goto error;
}
if (EVP_DigestSignUpdate(mdctx, unsigned_buf.s, unsigned_buf.len) <= 0) {
LM_ERR("Failed to add data to signing context\n");
goto error;
}
if (EVP_DigestSignFinal(mdctx, NULL, (size_t *)&der_sig_buf.len) <= 0) {
LM_ERR("Failed to get maximum signature length\n");
goto error;
}
der_sig_buf.s = pkg_malloc(der_sig_buf.len);
if (!der_sig_buf.s) {
LM_ERR("oom!\n");
goto error;
}
der_sig_p = (unsigned char *)der_sig_buf.s;
if (EVP_DigestSignFinal(mdctx, (unsigned char*)der_sig_buf.s,
(size_t *)&der_sig_buf.len) <= 0) {
LM_ERR("Failed to sign data\n");
goto error;
}
EVP_MD_CTX_destroy(mdctx);
mdctx = NULL;
/* convert from DER format to the internal structure in order to extract
* the R and S values */
sig = d2i_ECDSA_SIG(NULL, (const unsigned char **)&der_sig_p, der_sig_buf.len);
if (!sig) {
LM_ERR("Failed to convert from DER to internal format\n");
goto error;
}
pkg_free(der_sig_buf.s);
der_sig_buf.s = NULL;
ECDSA_SIG_get0(sig, &r, &s);
len = BN_bn2binpad(r, raw_sig_buf, R_S_INT_LEN);
if (len < 0 || len != R_S_INT_LEN) {
LM_ERR("Failed to convert R integer into binay represantation\n");
goto error;
}
len = BN_bn2binpad(s, raw_sig_buf + R_S_INT_LEN,
R_S_INT_LEN);
if (len < 0 || len != R_S_INT_LEN) {
LM_ERR("Failed to convert S integer into binay represantation\n");
goto error;
}
ECDSA_SIG_free(sig);
sig = NULL;
hdr_buf.len = IDENTITY_HDR_LEN + unsigned_buf.len + 1/*'.'*/ +
calc_base64_encode_len(RAW_SIG_LEN) + 1/*';'*/ + HDR_INFO_PARAM_LEN +
2/*'<','>'*/ + cr_url->len + 1/*';'*/ + HDR_PPT_PARAM_LEN + CRLF_LEN;
hdr_buf.s = pkg_malloc(hdr_buf.len);
if (!hdr_buf.s) {
LM_ERR("oom!\n");
goto error;
}
memcpy(hdr_buf.s, IDENTITY_HDR_S, IDENTITY_HDR_LEN);
memcpy(hdr_buf.s + IDENTITY_HDR_LEN, unsigned_buf.s, unsigned_buf.len);
hdr_buf.len = IDENTITY_HDR_LEN + unsigned_buf.len;
hdr_buf.s[hdr_buf.len++] = PPORT_SEPARATOR;
pkg_free(unsigned_buf.s);
base64urlencode((unsigned char*)(hdr_buf.s + hdr_buf.len),
(unsigned char*)raw_sig_buf, RAW_SIG_LEN);
hdr_buf.len += calc_base64_encode_len(RAW_SIG_LEN);
if (hdr_buf.s[hdr_buf.len-1] == BASE64_PAD_CHAR)
hdr_buf.len--;
if (hdr_buf.s[hdr_buf.len-1] == BASE64_PAD_CHAR)
hdr_buf.len--;
hdr_buf.s[hdr_buf.len++] = ';';
memcpy(hdr_buf.s + hdr_buf.len, HDR_INFO_PARAM_S, HDR_INFO_PARAM_LEN);
hdr_buf.len += HDR_INFO_PARAM_LEN;
hdr_buf.s[hdr_buf.len++] = '<';
memcpy(hdr_buf.s + hdr_buf.len, cr_url->s, cr_url->len);
hdr_buf.len += cr_url->len;
hdr_buf.s[hdr_buf.len++] = '>';
hdr_buf.s[hdr_buf.len++] = ';';
memcpy(hdr_buf.s + hdr_buf.len, HDR_PPT_PARAM_S, HDR_PPT_PARAM_LEN);
hdr_buf.len += HDR_PPT_PARAM_LEN;
memcpy(hdr_buf.s + hdr_buf.len, CRLF, CRLF_LEN);
hdr_buf.len += CRLF_LEN;
anchor = anchor_lump(msg, msg->unparsed - msg->buf, 0);
if (!anchor) {
LM_ERR("Failed to get anchor lump\n");
goto error;
}
if (!insert_new_lump_before(anchor, hdr_buf.s, hdr_buf.len, 0)) {
LM_ERR("Failed to insert lump\n");
goto error;
}
return 0;
error:
pkg_free(unsigned_buf.s);
if (mdctx)
EVP_MD_CTX_destroy(mdctx);
if (hdr_buf.s)
pkg_free(hdr_buf.s);
if (der_sig_buf.s)
pkg_free(der_sig_buf.s);
if (sig)
ECDSA_SIG_free(sig);
return -1;
}
static int load_cert(X509 **cert, STACK_OF(X509) **certchain, str *cert_buf)
{
BIO *cbio;
STACK_OF(X509) *stack;
STACK_OF(X509_INFO) *sk;
X509_INFO *xi;
cbio = BIO_new_mem_buf((void*)cert_buf->s,cert_buf->len);
if (!cbio) {
LM_ERR("Unable to create BIO buf\n");
return -1;
}
/* parse end-entity certificate */
*cert = PEM_read_bio_X509(cbio, NULL, 0, NULL);
if (*cert == NULL) {
LM_ERR("Failed to parse certificate\n");
BIO_free(cbio);
return -1;
}
if (certchain) {
/* parse untrusted certificate chain */
stack = sk_X509_new_null();
if (!stack) {
LM_ERR("Failed to allocate cert stack\n");
X509_free(*cert);
*cert = NULL;
BIO_free(cbio);
return -1;
}
sk = PEM_X509_INFO_read_bio(cbio, NULL, NULL, NULL);
if (!sk) {
LM_ERR("error reading certificate stack\n");
X509_free(*cert);
*cert = NULL;
BIO_free(cbio);
sk_X509_free(stack);
return -1;
}
while (sk_X509_INFO_num(sk)) {
xi = sk_X509_INFO_shift(sk);
if (xi->x509 != NULL) {
sk_X509_push(stack, xi->x509);
xi->x509 = NULL;
}
X509_INFO_free(xi);
}
if (!sk_X509_num(stack))
sk_X509_free(stack);
else
*certchain = stack;
BIO_free(cbio);
sk_X509_INFO_free(sk);
} else {
BIO_free(cbio);
}
return 0;
}
static int load_pkey(EVP_PKEY **pkey, str *pkey_buf)
{
BIO *kbio;
kbio = BIO_new_mem_buf((void*)pkey_buf->s, pkey_buf->len);
if (!kbio) {
LM_ERR("Unable to create BIO buf\n");
return -1;
}
*pkey = PEM_read_bio_PrivateKey(kbio, NULL, NULL, NULL);
if (*pkey == NULL) {
LM_ERR("Failed to load private key from buffer\n");
BIO_free(kbio);
return -1;
}
BIO_free(kbio);
return 0;
}
/* Note: MAY modify @num */
static int check_passport_phonenum(str *num, int log_lev)
{
if (!num->s || num->len == 0) {
LM_GEN(log_lev, "number cannot be NULL or empty\n");
return -1;
}
/* get rid of the '+' sign as it should not appear in the passport claim */
if (num->s[0] == '+') {
num->s++;
num->len--;
}
if (_is_e164(num, e164_strict_mode) == -1) {
LM_GEN(log_lev, "number is not in E.164 format: %.*s\n", num->len, num->s);
return -1;
}
return 0;
}
static int w_stir_auth(struct sip_msg *msg, str *attest, str *origid,
str *cert_buf, str *pkey_buf, str *cr_url, str *orig_tn_p, str *dest_tn_p)
{
time_t now, date_ts;
struct hdr_field *date_hf = NULL;
X509 *cert;
EVP_PKEY *pkey = NULL;
str orig_tn, dest_tn;
int rc, orig_log_lev = L_ERR, dest_log_lev = L_ERR;
/* looking for 'Identity' and 'Date' */
if (parse_headers(msg, HDR_EOH_F, 0) < 0) {
LM_ERR("Failed to parse headers\n");
return -1;
}
if (get_header_by_static_name(msg, "Identity")) {
LM_NOTICE("Identity header already exists\n");
return -2;
}
if (!orig_tn_p) {
if ((rc = get_orig_tn_from_msg(msg, &orig_tn)) < 0) {
if (rc == -1)
LM_ERR("Error determining Originator number\n");
else
LM_NOTICE("Originator URI is not a telephone number\n");
return rc;
}
orig_tn_p = &orig_tn;
orig_log_lev = L_NOTICE;
}
if (check_passport_phonenum(orig_tn_p, orig_log_lev) != 0) {
LM_GEN(orig_log_lev, "failed to validate Originator number (%.*s)\n",
orig_tn_p->len, orig_tn_p->s);
return -3;
}
if (!dest_tn_p) {
if ((rc = get_dest_tn_from_msg(msg, &dest_tn)) < 0) {
if (rc == -1)
LM_ERR("Error determining Destination number\n");
else
LM_NOTICE("Destination URI is not a telephone number\n");
return rc;
}
dest_tn_p = &dest_tn;
dest_log_lev = L_NOTICE;
}