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/*
* ========================================================================
* Copyright 2013-2021 Eduardo Chappa
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* ========================================================================
*/
/* OAUTH2 support code goes here. This is necessary because
* 1. it helps to coordinate two different methods, such as XOAUTH2 and
* OAUTHBEARER, which use the same code, so it can all go in one place
*
* 2. It helps with coordinating with the client when the server requires
* the deviceinfo method.
*/
/* http.h is supposed to be included, typically by including c-client.h */
#include "json.h"
#include "oauth2_aux.h"
/* we generate something like a guid, but not care about
* anything, but that it is really random.
*/
char *oauth2_generate_state(void)
{
char rv[37];
int i;
rv[0] = '\0';
for(i = 0; i < 4; i++)
sprintf(rv + strlen(rv), "%x", (unsigned int) (random() % 256));
sprintf(rv + strlen(rv), "%c", '-');
for(i = 0; i < 2; i++)
sprintf(rv + strlen(rv), "%x", (unsigned int) (random() % 256));
sprintf(rv + strlen(rv), "%c", '-');
for(i = 0; i < 2; i++)
sprintf(rv + strlen(rv), "%x", (unsigned int) (random() % 256));
sprintf(rv + strlen(rv), "%c", '-');
for(i = 0; i < 2; i++)
sprintf(rv + strlen(rv), "%x", (unsigned int) (random() % 256));
sprintf(rv + strlen(rv), "%c", '-');
for(i = 0; i < 6; i++)
sprintf(rv + strlen(rv), "%x", (unsigned int) (random() % 256));
rv[36] = '\0';
return cpystr(rv);
}
JSON_S *oauth2_json_reply(OAUTH2_SERVER_METHOD_S, OAUTH2_S *, int *);
char *xoauth2_server(char *, char *);
#define LOAD_HTTP_PARAMS(X, Y) { \
int i; \
for(i = 0; (X).params[i] != OA2_End; i++){ \
OA2_type j = (X).params[i]; \
(Y)[i].name = oauth2->param[j].name; \
(Y)[i].value = oauth2->param[j].value; \
} \
(Y)[i].name = (Y)[i].value = NULL; \
}
char *xoauth2_server(char *server, char *tenant)
{
char *rv = NULL;
char *s;
if (server == NULL) return NULL;
s = cpystr(server);
if(tenant){
char *t = s, *u;
int i;
for(i = 0; t != NULL; i++){
t = strchr(t, '\001');
if(t != NULL) t++;
}
rv = fs_get((strlen(s) + i*(strlen(tenant)-1) + 1)*sizeof(char));
*rv = '\0';
for(u = t = s; t != NULL; i++){
t = strchr(t, '\001');
if (t != NULL) *t = '\0';
strcat(rv, u);
if(t != NULL){
strcat(rv, tenant);
*t++ = '\001';
}
u = t;
}
}
else
rv = cpystr(server);
return rv;
}
JSON_S *oauth2_json_reply(OAUTH2_SERVER_METHOD_S RefreshMethod, OAUTH2_S *oauth2, int *status)
{
JSON_S *json = NULL;
HTTP_PARAM_S params[OAUTH2_PARAM_NUMBER];
HTTPSTREAM *stream = NIL;
unsigned char *s;
char *server = NULL;
LOAD_HTTP_PARAMS(RefreshMethod, params);
*status = 0;
server = xoauth2_server(RefreshMethod.urlserver, oauth2->param[OA2_Tenant].value);
if(strcmp(RefreshMethod.name, "POST") == 0
&& ((stream = http_open(server)) != NULL)
&& ((s = http_post_param(stream, params)) != NULL)){
json = json_parse(s);
fs_give((void **) &s);
}
*status = stream && stream->status ? stream->status->code : -1;
if(stream) http_close(stream);
if(server)
fs_give((void **) &server);
return json;
}
void
mm_login_oauth2_c_client_method (NETMBX *mb, char *user, char *method,
OAUTH2_S *oauth2, unsigned long trial, int *tryanother)
{
int status;
char *s = NULL;
JSON_S *json = NULL;
if(oauth2->param[OA2_Id].value == NULL
|| (oauth2->require_secret && oauth2->param[OA2_Secret].value == NULL)){
XOAUTH2_INFO_S *x;
oauth2clientinfo_t ogci =
(oauth2clientinfo_t) mail_parameters (NIL, GET_OA2CLIENTINFO, NIL);
if(ogci && (x = (*ogci)(oauth2->name, user)) != NULL){
oauth2->param[OA2_Id].value = cpystr(x->client_id);
oauth2->param[OA2_Secret].value = x->client_secret ? cpystr(x->client_secret) : NULL;
oauth2->param[OA2_Tenant].value = x->tenant ? cpystr(x->tenant) : NULL;
free_xoauth2_info(&x);
}
}
if(oauth2->param[OA2_Id].value == NULL
|| (oauth2->require_secret && oauth2->param[OA2_Secret].value == NULL)){
*tryanother = 1;
return;
}
/* Do we have a method to execute? */
if (oauth2->first_time && oauth2->server_mthd[OA2_GetDeviceCode].name){
oauth2deviceinfo_t ogdi;
json = oauth2_json_reply(oauth2->server_mthd[OA2_GetDeviceCode], oauth2, &status);
if(json != NULL){
JSON_S *jx;
json_assign ((void **) &oauth2->devicecode.device_code, json, "device_code", JString);
json_assign ((void **) &oauth2->devicecode.user_code, json, "user_code", JString);
json_assign ((void **) &oauth2->devicecode.verification_uri, json, "verification_uri", JString);
if((jx = json_body_value(json, "expires_in")) != NULL)
switch(jx->jtype){
case JString: oauth2->devicecode.expires_in = atoi((char *) jx->value);
break;
case JLong : oauth2->devicecode.expires_in = *(long *) jx->value;
break;
default : break;
}
if((jx = json_body_value(json, "interval")) != NULL)
switch(jx->jtype){
case JString: oauth2->devicecode.interval = atoi((char *) jx->value);
break;
case JLong : oauth2->devicecode.interval = *(long *) jx->value;
break;
default : break;
}
json_assign ((void **) &oauth2->devicecode.message, json, "message", JString);
json_free(&json);
if(oauth2->devicecode.verification_uri && oauth2->devicecode.user_code){
ogdi = (oauth2deviceinfo_t) mail_parameters (NIL, GET_OA2DEVICEINFO, NIL);
if(ogdi) (*ogdi)(oauth2, method);
}
}
return;
}
/* else check if we have a refresh token, and in that case use it */
if(oauth2->param[OA2_RefreshToken].value){
json = oauth2_json_reply(oauth2->server_mthd[OA2_GetAccessTokenFromRefreshToken], oauth2, &status);
if(json != NULL){
JSON_S *jx;
switch(status){
case HTTP_UNAUTHORIZED:
mm_log("Client not authorized (wrong client-id?)", ERROR);
break;
case HTTP_OK: json_assign ((void **) &oauth2->access_token, json, "access_token", JString);
if((jx = json_body_value(json, "expires_in")) != NULL)
switch(jx->jtype){
case JString: oauth2->expiration = time(0) + atol((char *) jx->value);
break;
case JLong : oauth2->expiration = time(0) + *(long *) jx->value;
break;
default : break;
}
oauth2->cancel_refresh_token = 0; /* do not cancel this token. It is good */
break;
default : { char tmp[200];
char *err, *err_desc;
jx = json_body_value(json, "error");
err = cpystr(jx && jx->jtype == JString ? (char *) jx->value : "Unknown error");
jx = json_body_value(json, "error_description");
err_desc = cpystr(jx && jx->jtype == JString ? (char *) jx->value : "No description");
sprintf(tmp, "Code %d: %.80s: %.80s", status, err, err_desc);
mm_log (tmp, ERROR);
if(err) fs_give((void **) &err);
if(err_desc) fs_give((void **) &err_desc);
oauth2->cancel_refresh_token++;
}
break;
}
json_free(&json);
}
return;
}
/*
* else, we do not have a refresh token, nor an access token.
* We need to start the process to get an access code. We use this
* to get an access token and refresh token.
*/
{ OAUTH2_SERVER_METHOD_S RefreshMethod = oauth2->server_mthd[OA2_GetAccessCode];
HTTP_PARAM_S params[OAUTH2_PARAM_NUMBER];
LOAD_HTTP_PARAMS(RefreshMethod, params);
if(strcmp(RefreshMethod.name, "GET") == 0){
char *server = xoauth2_server(RefreshMethod.urlserver, oauth2->param[OA2_Tenant].value);
char *url = http_get_param_url(server, params);
oauth2getaccesscode_t ogac =
(oauth2getaccesscode_t) mail_parameters (NIL, GET_OA2CLIENTGETACCESSCODE, NIL);
if(ogac)
oauth2->param[OA2_Code].value = (*ogac)(url, method, oauth2, tryanother);
if(server) fs_give((void **) &server);
}
if(oauth2->param[OA2_Code].value){
json = oauth2_json_reply(oauth2->server_mthd[OA2_GetAccessTokenFromAccessCode], oauth2, &status);
if(json != NULL){
JSON_S *jx;
switch(status){
case HTTP_OK : json_assign ((void **) &oauth2->param[OA2_RefreshToken].value, json, "refresh_token", JString);
json_assign ((void **) &oauth2->access_token, json, "access_token", JString);
if((jx = json_body_value(json, "expires_in")) != NULL)
switch(jx->jtype){
case JString: oauth2->expiration = time(0) + atol((char *) jx->value);
break;
case JLong : oauth2->expiration = time(0) + *(long *) jx->value;
break;
default : break;
}
oauth2->cancel_refresh_token = 0; /* do not cancel this token. It is good */
break;
case HTTP_BAD : break;
default : { char tmp[200];
char *err, *err_desc;
jx = json_body_value(json, "error");
err = cpystr(jx && jx->jtype == JString ? (char *) jx->value : "Unknown error");
jx = json_body_value(json, "error_description");
err_desc = cpystr(jx && jx->jtype == JString ? (char *) jx->value : "No description");
sprintf(tmp, "Code %d: %.80s: %.80s", status, err, err_desc);
mm_log (tmp, ERROR);
if(err) fs_give((void **) &err);
if(err_desc) fs_give((void **) &err_desc);
oauth2->cancel_refresh_token++;
}
}
json_free(&json);
}
}
return;
}
}
void oauth2deviceinfo_get_accesscode(void *inp, void *outp)
{
OAUTH2_DEVICEPROC_S *oad = (OAUTH2_DEVICEPROC_S *) inp;
OAUTH2_S *oauth2 = oad->xoauth2;
OAUTH2_DEVICECODE_S *dcode = &oauth2->devicecode;
int done = 0, status, rv;
JSON_S *json;
if(dcode->device_code && oauth2->param[OA2_DeviceCode].value == NULL)
oauth2->param[OA2_DeviceCode].value = cpystr(dcode->device_code);
rv = OA2_CODE_WAIT; /* wait by default */
json = oauth2_json_reply(oauth2->server_mthd[OA2_GetAccessTokenFromAccessCode], oauth2, &status);
if(json != NULL){
JSON_S *jx;
char *error = NIL;
switch(status){
case HTTP_BAD : json_assign ((void **) &error, json, "error", JString);
if(!error) break;
if(compare_cstring(error, "authorization_pending") == 0)
rv = OA2_CODE_WAIT;
else if(compare_cstring(error, "authorization_declined") == 0)
rv = OA2_CODE_FAIL;
else if(compare_cstring(error, "bad_verification_code") == 0)
rv = OA2_CODE_FAIL;
else if(compare_cstring(error, "expired_token") == 0)
rv = OA2_CODE_FAIL;
else /* keep waiting? */
rv = OA2_CODE_WAIT;
break;
case HTTP_OK : json_assign ((void **) &oauth2->param[OA2_RefreshToken].value, json, "refresh_token", JString);
json_assign ((void **) &oauth2->access_token, json, "access_token", JString);
if((jx = json_body_value(json, "expires_in")) != NULL)
switch(jx->jtype){
case JString: oauth2->expiration = time(0) + atol((char *) jx->value);
break;
case JLong : oauth2->expiration = time(0) + *(long *) jx->value;
break;
default : break;
}
rv = OA2_CODE_SUCCESS;
oauth2->cancel_refresh_token = 0; /* do not cancel this token. It is good */
break;
default : { char tmp[100];
sprintf(tmp, "Oauth device Received Code %d", status);
mm_log (tmp, ERROR);
oauth2->cancel_refresh_token++;
}
}
json_free(&json);
}
*(int *)outp = rv;
}
XOAUTH2_INFO_S *new_xoauth2_info(void)
{
XOAUTH2_INFO_S *rv = fs_get(sizeof(XOAUTH2_INFO_S));
memset((void *) rv, 0, sizeof(XOAUTH2_INFO_S));
return rv;
}
void free_xoauth2_info(XOAUTH2_INFO_S **xp)
{
if(xp == NULL || *xp == NULL) return;
if((*xp)->name) fs_give((void **) &(*xp)->name);
if((*xp)->client_id) fs_give((void **) &(*xp)->client_id);
if((*xp)->client_secret) fs_give((void **) &(*xp)->client_secret);
if((*xp)->tenant) fs_give((void **) &(*xp)->tenant);
if((*xp)->flow) fs_give((void **) &(*xp)->flow);
if((*xp)->users) fs_give((void **) &(*xp)->users);
fs_give((void **) xp);
}
XOAUTH2_INFO_S *copy_xoauth2_info(XOAUTH2_INFO_S *x)
{
XOAUTH2_INFO_S *y;
if(x == NULL) return NULL;
y = new_xoauth2_info();
if(x->name) y->name = cpystr(x->name);
if(x->client_id) y->client_id = cpystr(x->client_id);
if(x->client_secret) y->client_secret = cpystr(x->client_secret);
if(x->tenant) y->tenant = cpystr(x->tenant);
if(x->flow) y->flow = cpystr(x->flow);
if(x->users) y->users = cpystr(x->users);
return y;
}
/* This function does not create a refresh token and and
* an access token, but uses an already known refresh token
* to generate a refresh token on an ALREADY OPEN stream.
* The assumption is that the user has already unlocked all
* passwords and the app can access them from some source
* (key chain/credentials/memory) to go through this
* process seamlessly.
*/
void renew_accesstoken(MAILSTREAM *stream)
{
OAUTH2_S oauth2;
NETMBX mb;
char user[MAILTMPLEN];
int tryanother;
unsigned long trial = 0;
memset((void *) &oauth2, 0, sizeof(OAUTH2_S));
mail_valid_net_parse(stream->original_mailbox, &mb);
user[0] = '\0';
mm_login_method (&mb, user, (void *) &oauth2, trial, stream->auth.name);
oauth2.param[OA2_State].value = NIL; /* this is freed before we get here */
if(stream->auth.expiration == 0){
stream->auth.expiration = oauth2.expiration;
return;
}
if(oauth2.access_token)
fs_give((void **) &oauth2.access_token);
oauth2.param[OA2_State].value = oauth2_generate_state();
mm_login_oauth2_c_client_method (&mb, user, stream->auth.name, &oauth2, trial, &tryanother);
if(oauth2.access_token)
mm_login_method (&mb, user, (void *) &oauth2, trial, stream->auth.name);
stream->auth.expiration = oauth2.expiration;
if(oauth2.param[OA2_Id].value) fs_give((void **) &oauth2.param[OA2_Id].value);
if(oauth2.param[OA2_Secret].value) fs_give((void **) &oauth2.param[OA2_Secret].value);
if(oauth2.param[OA2_Tenant].value) fs_give((void **) &oauth2.param[OA2_Tenant].value);
if(oauth2.param[OA2_State].value) fs_give((void **) &oauth2.param[OA2_State].value);
if(oauth2.param[OA2_RefreshToken].value) fs_give((void **) &oauth2.param[OA2_RefreshToken].value);
if(oauth2.access_token) fs_give((void **) &oauth2.access_token);
}
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