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/* Copyright (c) 2017-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "str.h"
#include "net.h"
#include "json-parser.h"
#include "istream.h"
#include "dsasl-client-private.h"
struct oauthbearer_dsasl_client {
struct dsasl_client client;
const char *host;
const char *status;
in_port_t port;
bool output_sent;
};
static int
mech_oauthbearer_input(struct dsasl_client *_client,
const unsigned char *input, size_t input_len,
const char **error_r)
{
struct oauthbearer_dsasl_client *client =
(struct oauthbearer_dsasl_client *)_client;
if (!client->output_sent) {
if (input_len > 0) {
*error_r = "Server sent non-empty initial response";
return -1;
}
} else {
client->status = "";
/* if response is empty, authentication has *SUCCEEDED* */
if (input_len == 0)
return 0;
/* authentication has failed, try parse status.
we are only interested in extracting status if possible
so we don't really need to much error handling. */
struct istream *is = i_stream_create_from_data(input, input_len);
const char *status = NULL, *value;
const char *error = NULL;
enum json_type jtype;
bool found_status = FALSE;
struct json_parser *parser = json_parser_init(is);
while (json_parse_next(parser, &jtype, &value)>0) {
if (found_status && status == NULL) {
if (jtype == JSON_TYPE_STRING ||
jtype == JSON_TYPE_NUMBER)
status = t_strdup(value);
break;
} else if (jtype == JSON_TYPE_OBJECT_KEY &&
strcmp(value, "status") == 0) {
found_status = TRUE;
} else json_parse_skip_next(parser);
}
/* deinitialize json parser */
int ret = json_parser_deinit(&parser, &error);
i_stream_unref(&is);
if (status != NULL)
client->status = p_strdup(_client->pool, status);
else {
ret = -1;
if (error == NULL)
error = "Status value missing";
}
if (ret < 0)
*error_r = t_strdup_printf("Error parsing JSON reply: %s",
error);
else
*error_r = t_strdup_printf("Failed to authenticate: %s",
client->status);
return -1;
}
return 0;
}
static int
mech_oauthbearer_output(struct dsasl_client *_client,
const unsigned char **output_r, size_t *output_len_r,
const char **error_r)
{
struct oauthbearer_dsasl_client *client =
(struct oauthbearer_dsasl_client *)_client;
string_t *str;
if (_client->set.authid == NULL) {
*error_r = "authid not set";
return -1;
}
if (_client->password == NULL) {
*error_r = "password not set";
return -1;
}
str = str_new(_client->pool, 64);
str_printfa(str, "n,a=%s,\x01", _client->set.authid);
if (client->host != NULL && *client->host != '\0')
str_printfa(str, "host=%s\x01", client->host);
if (client->port > 0)
str_printfa(str, "port=%u\x01", client->port);
str_printfa(str, "auth=Bearer %s\x01", _client->password);
str_append_c(str, '\x01');
*output_r = str_data(str);
*output_len_r = str_len(str);
client->output_sent = TRUE;
return 0;
}
static int
mech_xoauth2_output(struct dsasl_client *_client,
const unsigned char **output_r, size_t *output_len_r,
const char **error_r)
{
struct oauthbearer_dsasl_client *client =
(struct oauthbearer_dsasl_client *)_client;
string_t *str;
if (_client->set.authid == NULL) {
*error_r = "authid not set";
return -1;
}
if (_client->password == NULL) {
*error_r = "password not set";
return -1;
}
str = str_new(_client->pool, 64);
str_printfa(str, "user=%s\x01", _client->set.authid);
str_printfa(str, "auth=Bearer %s\x01", _client->password);
str_append_c(str, '\x01');
*output_r = str_data(str);
*output_len_r = str_len(str);
client->output_sent = TRUE;
return 0;
}
static int
mech_oauthbearer_set_parameter(struct dsasl_client *_client, const char *key,
const char *value, const char **error_r)
{
struct oauthbearer_dsasl_client *client =
(struct oauthbearer_dsasl_client *)_client;
if (strcmp(key, "host") == 0) {
if (value != NULL)
client->host = p_strdup(_client->pool, value);
else
client->host = NULL;
return 1;
} else if (strcmp(key, "port") == 0) {
if (value == NULL) {
client->port = 0;
} else if (net_str2port(value, &client->port) < 0) {
*error_r = "Invalid port value";
return -1;
}
return 1;
}
return 0;
}
static int
mech_oauthbearer_get_result(struct dsasl_client *_client, const char *key,
const char **value_r, const char **error_r ATTR_UNUSED)
{
struct oauthbearer_dsasl_client *client =
(struct oauthbearer_dsasl_client *)_client;
if (strcmp(key, "status") == 0) {
/* this is set to value after login attempt */
i_assert(client->status != NULL);
*value_r = client->status;
return 1;
}
return 0;
}
const struct dsasl_client_mech dsasl_client_mech_oauthbearer = {
.name = "OAUTHBEARER",
.struct_size = sizeof(struct oauthbearer_dsasl_client),
.input = mech_oauthbearer_input,
.output = mech_oauthbearer_output,
.set_parameter = mech_oauthbearer_set_parameter,
.get_result = mech_oauthbearer_get_result,
};
const struct dsasl_client_mech dsasl_client_mech_xoauth2 = {
.name = "XOAUTH2",
.struct_size = sizeof(struct oauthbearer_dsasl_client),
.input = mech_oauthbearer_input,
.output = mech_xoauth2_output,
.set_parameter = mech_oauthbearer_set_parameter,
.get_result = mech_oauthbearer_get_result,
};
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