Example #1
0
PJ_DEF(pj_str_t) pjsip_calculate_branch_id( pjsip_rx_data *rdata )
{
    pj_md5_context ctx;
    pj_uint8_t digest[16];
    pj_str_t branch;
    pj_str_t rfc3261_branch = {PJSIP_RFC3261_BRANCH_ID, 
                               PJSIP_RFC3261_BRANCH_LEN};

    /* If incoming request does not have RFC 3261 branch value, create
     * a branch value from GUID .
     */
    if (pj_strncmp(&rdata->msg_info.via->branch_param, 
		   &rfc3261_branch, PJSIP_RFC3261_BRANCH_LEN) != 0 ) 
    {
	pj_str_t tmp;

	branch.ptr = (char*)
		     pj_pool_alloc(rdata->tp_info.pool, PJSIP_MAX_BRANCH_LEN);
	branch.slen = PJSIP_RFC3261_BRANCH_LEN;
	pj_memcpy(branch.ptr, PJSIP_RFC3261_BRANCH_ID, 
	          PJSIP_RFC3261_BRANCH_LEN);

	tmp.ptr = branch.ptr + PJSIP_RFC3261_BRANCH_LEN + 2;
	*(tmp.ptr-2) = (pj_int8_t)(branch.slen+73); 
	*(tmp.ptr-1) = (pj_int8_t)(branch.slen+99);
	pj_generate_unique_string( &tmp );

	branch.slen = PJSIP_MAX_BRANCH_LEN;
	return branch;
    }

    /* Create branch ID for new request by calculating MD5 hash
     * of the branch parameter in top-most Via header.
     */
    pj_md5_init(&ctx);
    pj_md5_update(&ctx, (pj_uint8_t*)rdata->msg_info.via->branch_param.ptr,
		  rdata->msg_info.via->branch_param.slen);
    pj_md5_final(&ctx, digest);

    branch.ptr = (char*)
    		 pj_pool_alloc(rdata->tp_info.pool, 
			       34 + PJSIP_RFC3261_BRANCH_LEN);
    pj_memcpy(branch.ptr, PJSIP_RFC3261_BRANCH_ID, PJSIP_RFC3261_BRANCH_LEN);
    branch.slen = PJSIP_RFC3261_BRANCH_LEN;
    *(branch.ptr+PJSIP_RFC3261_BRANCH_LEN) = (pj_int8_t)(branch.slen+73);
    *(branch.ptr+PJSIP_RFC3261_BRANCH_LEN+1) = (pj_int8_t)(branch.slen+99);
    digest2str(digest, branch.ptr+PJSIP_RFC3261_BRANCH_LEN+2);
    branch.slen = 34 + PJSIP_RFC3261_BRANCH_LEN;

    return branch;
}
Example #2
0
/*
 * Create response digest based on the parameters and store the
 * digest ASCII in 'result'. 
 */
PJ_DEF(void) pjsip_auth_create_digest( pj_str_t *result,
				       const pj_str_t *nonce,
				       const pj_str_t *nc,
				       const pj_str_t *cnonce,
				       const pj_str_t *qop,
				       const pj_str_t *uri,
				       const pj_str_t *realm,
				       const pjsip_cred_info *cred_info,
				       const pj_str_t *method)
{
    char ha1[PJSIP_MD5STRLEN];
    char ha2[PJSIP_MD5STRLEN];
    unsigned char digest[16];
    pj_md5_context pms;

    pj_assert(result->slen >= PJSIP_MD5STRLEN);

    AUTH_TRACE_((THIS_FILE, "Begin creating digest"));

    if ((cred_info->data_type & PASSWD_MASK) == PJSIP_CRED_DATA_PLAIN_PASSWD) {
	/*** 
	 *** ha1 = MD5(username ":"******":" password) 
	 ***/
	pj_md5_init(&pms);
	MD5_APPEND( &pms, cred_info->username.ptr, cred_info->username.slen);
	MD5_APPEND( &pms, ":", 1);
	MD5_APPEND( &pms, realm->ptr, realm->slen);
	MD5_APPEND( &pms, ":", 1);
	MD5_APPEND( &pms, cred_info->data.ptr, cred_info->data.slen);
	pj_md5_final(&pms, digest);

	digest2str(digest, ha1);

    } else if ((cred_info->data_type & PASSWD_MASK) == PJSIP_CRED_DATA_DIGEST) {
	pj_assert(cred_info->data.slen == 32);
	pj_memcpy( ha1, cred_info->data.ptr, cred_info->data.slen );
    } else {
	pj_assert(!"Invalid data_type");
    }

    AUTH_TRACE_((THIS_FILE, "  ha1=%.32s", ha1));

    /***
     *** ha2 = MD5(method ":" req_uri) 
     ***/
    pj_md5_init(&pms);
    MD5_APPEND( &pms, method->ptr, method->slen);
    MD5_APPEND( &pms, ":", 1);
    MD5_APPEND( &pms, uri->ptr, uri->slen);
    pj_md5_final(&pms, digest);
    digest2str(digest, ha2);

    AUTH_TRACE_((THIS_FILE, "  ha2=%.32s", ha2));

    /***
     *** When qop is not used:
     ***    response = MD5(ha1 ":" nonce ":" ha2) 
     ***
     *** When qop=auth is used:
     ***    response = MD5(ha1 ":" nonce ":" nc ":" cnonce ":" qop ":" ha2)
     ***/
    pj_md5_init(&pms);
    MD5_APPEND( &pms, ha1, PJSIP_MD5STRLEN);
    MD5_APPEND( &pms, ":", 1);
    MD5_APPEND( &pms, nonce->ptr, nonce->slen);
    if (qop && qop->slen != 0) {
	MD5_APPEND( &pms, ":", 1);
	MD5_APPEND( &pms, nc->ptr, nc->slen);
	MD5_APPEND( &pms, ":", 1);
	MD5_APPEND( &pms, cnonce->ptr, cnonce->slen);
	MD5_APPEND( &pms, ":", 1);
	MD5_APPEND( &pms, qop->ptr, qop->slen);
    }
    MD5_APPEND( &pms, ":", 1);
    MD5_APPEND( &pms, ha2, PJSIP_MD5STRLEN);

    /* This is the final response digest. */
    pj_md5_final(&pms, digest);
    
    /* Convert digest to string and store in chal->response. */
    result->slen = PJSIP_MD5STRLEN;
    digest2str(digest, result->ptr);

    AUTH_TRACE_((THIS_FILE, "  digest=%.32s", result->ptr));
    AUTH_TRACE_((THIS_FILE, "Digest created"));
}