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server.c
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/*++
Copyright (c) 2022 MobSlicer152
Module Name:
server.c
Abstract:
This module implements the server.
--*/
#include "server.h"
#include "curl/easy.h"
#define CURLWRITE_SIZE 2048
typedef struct _CURL_BUFFER
{
CHAR Data[CURLWRITE_SIZE];
SIZE_T Length;
} CURL_BUFFER, *PCURL_BUFFER;
CHAR Url[128];
PCHAR SpreadsheetId;
PCHAR GoogleOauth2ClientJson;
PCHAR GoogleOauth2AuthUri;
PCHAR GoogleOauth2TokenUri;
PCHAR GoogleOauth2ClientId;
PCHAR GoogleOauth2ClientSecret;
BOOLEAN HaveGoogleOauth2Token;
PCHAR GoogleOauth2Token;
PCHAR TlsCertPath;
PCHAR TlsKeyPath;
UINT16 Port;
INT PollRate;
PCHAR Email;
CHAR GoogleAuthCode[256];
CHAR GoogleAuthState[256];
CHAR GoogleOauth2AccessToken[256];
UINT64 TimeOfLastRefresh;
UINT16 TimeUntilRefresh;
BOOLEAN HaveGoogleAuthCode;
VOID
HandleEvent(
IN struct mg_connection* Connection,
IN INT Event,
IN PVOID EventData,
IN PVOID Data
)
/*++
Routine Description:
This routine handles events from the server.
Arguments:
Connection - The connection to the server.
Event - The event.
EventData - Data for the event.
Data - Data for the function, not used.
Return Value:
None.
--*/
{
struct mg_http_serve_opts StaticOptions = {.root_dir = ROOT_DIR};
if ( Event == MG_EV_ACCEPT )
{
struct mg_tls_opts TlsOptions = {
.cert = TlsCertPath,
.certkey = TlsKeyPath
};
mg_tls_init(
Connection,
&TlsOptions
);
}
else if ( Event == MG_EV_HTTP_MSG )
{
struct mg_http_message* HttpMessage = EventData;
struct mg_str* Host = mg_http_get_header(HttpMessage, "Host");
CHAR Query[1024];
struct mg_str QueryMgStr;
PCHAR p;
p = NULL;
if ( HttpMessage->query.ptr )
{
p = strstr(HttpMessage->query.ptr, " HTTP");
if ( p )
{
size_t Count = MIN(
p - HttpMessage->query.ptr,
ARRAY_SIZE(Query) - 1
);
strncpy(
Query,
HttpMessage->query.ptr,
Count
);
Query[Count] = 0;
QueryMgStr.ptr = Query;
QueryMgStr.len = Count;
}
}
LOG("Serving host %s\n", Host->ptr);
if ( mg_http_match_uri(
HttpMessage,
MAKE_ENDPOINT(TEST_ENDPOINT)
) )
{
mg_http_reply(
Connection,
200,
"Content-Type: text/plain\r\n",
"yes"
);
}
else if ( mg_http_match_uri(
HttpMessage,
MAKE_ENDPOINT(SEND_USER_ENDPOINT)
) )
{
CHAR Name[128];
CHAR Number[10];
PCCHAR Warning;
INT NameLen;
INT NumberLen;
LOG("Handling send_user\n");
NameLen = mg_http_get_var(
&QueryMgStr,
"name",
Name,
ARRAY_SIZE(Name)
);
if ( NameLen == -3 )
{
NameLen = strlen(Name);
}
NumberLen = mg_http_get_var(
&QueryMgStr,
"number",
Number,
ARRAY_SIZE(Number)
);
if ( NumberLen == -3 )
{
NumberLen = strlen(Number);
}
if ( NameLen > 0 && NumberLen > 0 )
{
LOG("Received name %s and number %s\n", Name, Number);
// Warnings must start with a newline for frontend
if ( atoi(Number) < 100000000 )
{
Warning = "\nNumber is invalid or less than 9 digits";
}
else
{
Warning = "";
}
mg_http_reply(
Connection,
200,
"Content-Type: text/plain\r\n",
"success\n%s\n%s%s",
Name,
Number,
Warning
);
}
else if ( NameLen <= 0 && NumberLen > 0 )
{
LOG("Invalid name (query %s)\n", p ? Query : "(none)");
mg_http_reply(
Connection,
400,
"Content-Type: text/plain\r\n",
"Invalid name (query %s)\n",
p ? Query : "(none)"
);
}
else if ( NameLen > 0 && NumberLen <= 0 )
{
LOG("Invalid number (query %s)\n", p ? Query : "(none)");
mg_http_reply(
Connection,
400,
"Content-Type: text/plain\r\n",
"Invalid number (query %s)\n",
p ? Query : "(none)"
);
}
else if ( NameLen <= 0 && NumberLen <= 0 )
{
LOG("Invalid name and number (query %s)\n", p ? Query : "(none)");
mg_http_reply(
Connection,
400,
"Content-Type: text/plain\r\n",
"Invalid name and number (query %s)\n",
p ? Query : "(none)"
);
}
}
else if ( mg_http_match_uri(
HttpMessage,
MAKE_ENDPOINT(OAUTH_ENDPOINT)
) )
{
LOG("Received authentication response from Google\n");
if ( !HaveGoogleAuthCode )
{
mg_http_get_var(
&QueryMgStr,
"code",
GoogleAuthCode,
ARRAY_SIZE(GoogleAuthCode)
);
mg_http_get_var(
&QueryMgStr,
"state",
GoogleAuthState,
ARRAY_SIZE(GoogleAuthState)
);
HaveGoogleAuthCode = TRUE;
}
else
{
}
}
else
{
LOG("Serving static content in " ROOT_DIR "/" STATIC_PAGE "\n");
mg_http_serve_file(
Connection,
HttpMessage,
STATIC_PAGE,
&StaticOptions
);
}
}
}
static INT LastSignal;
VOID
HandleSignal(
IN INT Signal
)
/*++
Routine Description:
Saves signals so the server can exit cleanly.
Arguments:
Signal
--*/
{
LastSignal = Signal;
LOG("Received signal %d\n", LastSignal);
}
SIZE_T
CurlWrite(
IN PVOID Pointer,
IN SIZE_T Size,
IN SIZE_T Count,
IN PVOID Buffer
)
/*++
Routine Description:
Writes curl'd data to a buffer (must be 1024 bytes).
Arguments:
Pointer - Input data to write.
Size - Size of elements.
Count - Number of elements.
Buffer - Buffer to write to. Must be at least 1024 bytes.
Return Value:
Returns the number of bytes written.
--*/
{
PCURL_BUFFER RealBuffer = Buffer;
SIZE_T AmountCopied;
if ( !Buffer )
{
return 0;
}
LOG("Writing data for cURL\n");
if ( Size * Count > CURLWRITE_SIZE - RealBuffer->Length )
{
AmountCopied = CURLWRITE_SIZE - RealBuffer->Length;
}
else
{
AmountCopied = Size * Count;
}
memcpy(
RealBuffer->Data + RealBuffer->Length,
Pointer,
AmountCopied
);
if ( Buffer && Size == sizeof(CHAR) && strnlen(Buffer, Size * Count) > 0 )
{
LOG("Data:\n%s\n", (PCHAR)Buffer);
}
HaveGoogleOauth2Token = TRUE;
RealBuffer->Length += AmountCopied;
return AmountCopied;
}
BOOLEAN
AuthenticateGoogle(
IN PVOID Parameter
)
/*++
Routine Description:
This routine gets an OAuth token for the Google Sheets API.
TODO: Much of the RNG code should be put in a more reusable function.
Arguments:
None.
Return Value:
TRUE - Obtaining the token was successful.
FALSE - Obtaining the token failed.
--*/
{
/*
BYTE RandomBytes[64];
CHAR State[33];
CHAR CodeVerifier[129];
CHAR CodeSha256[65];
CHAR CodeChallenge[172];
*/
CHAR RequestUrl[1024];
UINT Error;
CURL* Curl;
CURL_BUFFER Response = {0};
INT i;
struct curl_slist* HttpHeader;
cJSON* JsonResponseRoot;
cJSON* JsonObject;
(Parameter);
/*LOG("Creating challenge code\n");
CodeVerifier[0] = 0;
Error = psa_generate_random(
RandomBytes,
sizeof(RandomBytes)
);
while ( Error != PSA_SUCCESS )
{
LOG("Random byte generation failed: PSA status %d\n", Error);
Error = psa_generate_random(
RandomBytes,
sizeof(RandomBytes)
);
}
for ( i = 0; i < ARRAY_SIZE(RandomBytes); i++ )
{
snprintf(
CodeVerifier + i * 2,
ARRAY_SIZE(CodeVerifier) - i * 2,
"%02X",
RandomBytes[i]
);
if ( !CodeVerifier[i * 2] || !CodeVerifier[i * 2 + 1] )
{
CodeVerifier[i * 2] = '0';
CodeVerifier[i * 2 + 1] = '0';
}
}
CodeVerifier[ARRAY_SIZE(CodeVerifier) - 1] = 0;
LOG("Encoding challenge verifier \"%s\"\n", CodeVerifier);
if ( mbedtls_sha256(
CodeVerifier,
ARRAY_SIZE(CodeVerifier),
CodeSha256,
FALSE
) )
{
LOG("Failed to compute SHA256 of %s\n", CodeVerifier);
return FALSE;
}
mg_base64_encode(
CodeSha256,
ARRAY_SIZE(CodeSha256),
CodeChallenge
);
memset(
CodeSha256,
0,
sizeof(CodeSha256)
);
if ( strchr(
CodeChallenge,
'='
) )
{
*strchr(
CodeChallenge,
'='
) = 0;
}
for ( i = 0; i < ARRAY_SIZE(CodeChallenge); i++ )
{
if ( CodeChallenge[i] == '+' )
{
CodeChallenge[i] = '-';
}
else if ( CodeChallenge[i] == '/' )
{
CodeChallenge[i] = '_';
}
}*/
snprintf(
RequestUrl,
ARRAY_SIZE(RequestUrl),
"%s?"
"response_type=code&"
"scope=openid%%20profile%%20https://www.googleapis.com/auth/drive%%20https://www.googleapis.com/auth/drive.file%%20https://www.googleapis.com/auth/spreadsheets&"
"redirect_uri=https://localhost:%d" MAKE_ENDPOINT(OAUTH_ENDPOINT) "&"
"client_id=%s&"
"state=asdf&"
//"code_challenge=%s&"
//"code_challenge_method=S256&"
"login_hint=%s",
GoogleOauth2AuthUri,
Port,
GoogleOauth2ClientId,
//CodeChallenge,
Email
);
LOG("Visit this URL to authenticate: %s\n", RequestUrl);
HaveGoogleAuthCode = FALSE;
while ( !HaveGoogleAuthCode )
{
;
}
HttpHeader = NULL;
HttpHeader = curl_slist_append(
HttpHeader,
"Content-Type: application/x-www-form-urlencoded"
);
snprintf(
RequestUrl,
ARRAY_SIZE(RequestUrl),
"client_id=%s&"
"client_secret=%s&"
"code=%s&"
//"code_verifier=%s&"
"redirect_uri=https%%3A//localhost%%3A%hu" MAKE_ENDPOINT(OAUTH_ENDPOINT) "&"
"grant_type=authorization_code",
GoogleOauth2ClientId,
GoogleOauth2ClientSecret,
GoogleAuthCode,
Port
//CodeVerifier
);
LOG("Requesting token:\n%s\n", RequestUrl);
HaveGoogleOauth2Token = FALSE;
Curl = curl_easy_init();
curl_easy_setopt(
Curl,
CURLOPT_PROTOCOLS,
CURLPROTO_HTTPS
);
curl_easy_setopt(
Curl,
CURLOPT_URL,
"https://oauth2.googleapis.com/token"
);
curl_easy_setopt(
Curl,
CURLOPT_HTTPHEADER,
HttpHeader
);
curl_easy_setopt(
Curl,
CURLOPT_POSTFIELDS,
RequestUrl
);
curl_easy_setopt(
Curl,
CURLOPT_POSTFIELDSIZE,
strlen(RequestUrl) + 1
);
curl_easy_setopt(
Curl,
CURLOPT_SSL_VERIFYPEER,
FALSE
);
curl_easy_setopt(
Curl,
CURLOPT_WRITEDATA,
&Response
);
curl_easy_setopt(
Curl,
CURLOPT_WRITEFUNCTION,
CurlWrite
);
curl_easy_perform(Curl);
curl_easy_cleanup(Curl);
JsonResponseRoot = cJSON_Parse(Response.Data);
JsonObject = cJSON_GetObjectItem(
JsonResponseRoot,
"access_token"
);
if ( JsonObject )
{
strncpy(
GoogleOauth2AccessToken,
cJSON_GetStringValue(JsonObject),
ARRAY_SIZE(GoogleOauth2AccessToken)
);
JsonObject = cJSON_GetObjectItem(
JsonResponseRoot,
"refresh_token"
);
GoogleOauth2Token = strdup(cJSON_GetStringValue(JsonObject));
JsonObject = cJSON_GetObjectItem(
JsonResponseRoot,
"expires_in"
);
TimeUntilRefresh = cJSON_GetNumberValue(JsonObject);
TimeOfLastRefresh = time(NULL);
LOG("Set server.google_oauth2_token to \"%s\"", GoogleOauth2Token);
exit(0);
}
else
{
LOG("Failed to get tokens:\n%s\n", Response.Data);
exit(1);
}
}
BOOLEAN
RefreshGoogleToken(
VOID
)
/*++
Routine Description:
Refreshes the Google access token using the refresh token.
Arguments:
None.
Return Value:
TRUE - The refresh was successful.
FALSE - The refresh failed and the application sshould exit.
--*/
{
CHAR RequestBody[512];
struct curl_slist* HttpHeader;
CURL_BUFFER Response = {0};
CURL* Curl;
cJSON* JsonResponseRoot;
cJSON* JsonObject;
HttpHeader = NULL;
HttpHeader = curl_slist_append(
HttpHeader,
"Content-Type: application/x-www-form-urlencoded"
);
snprintf(
RequestBody,
ARRAY_SIZE(RequestBody),
"client_id=%s&"
"client_secret=%s&"
"grant_type=refresh_token&"
"refresh_token=%s",
GoogleOauth2ClientId,
GoogleOauth2ClientSecret,
GoogleOauth2Token
);
LOG("Attempting to refresh access token\n");
LOG("Requesting token:\n%s\n", RequestBody);
HaveGoogleOauth2Token = FALSE;
Curl = curl_easy_init();
curl_easy_setopt(
Curl,
CURLOPT_PROTOCOLS,
CURLPROTO_HTTPS
);
curl_easy_setopt(
Curl,
CURLOPT_URL,
"https://oauth2.googleapis.com/token"
);
curl_easy_setopt(
Curl,
CURLOPT_HTTPHEADER,
HttpHeader
);
curl_easy_setopt(
Curl,
CURLOPT_POSTFIELDS,
RequestBody
);
curl_easy_setopt(
Curl,
CURLOPT_POSTFIELDSIZE,
strlen(RequestBody) + 1
);
curl_easy_setopt(
Curl,
CURLOPT_SSL_VERIFYPEER,
FALSE
);
curl_easy_setopt(
Curl,
CURLOPT_WRITEDATA,
&Response
);
curl_easy_setopt(
Curl,
CURLOPT_WRITEFUNCTION,
CurlWrite
);
curl_easy_perform(Curl);
curl_easy_cleanup(Curl);
JsonResponseRoot = cJSON_Parse(Response.Data);
JsonObject = cJSON_GetObjectItem(
JsonResponseRoot,
"access_token"
);
if (JsonObject)
{
strncpy(
GoogleOauth2AccessToken,
cJSON_GetStringValue(JsonObject),
ARRAY_SIZE(GoogleOauth2AccessToken) - 1
);
GoogleOauth2Token = strdup(cJSON_GetStringValue(JsonObject));
JsonObject = cJSON_GetObjectItem(
JsonResponseRoot,
"expires_in"
);
TimeUntilRefresh = cJSON_GetNumberValue(JsonObject);
TimeOfLastRefresh = time(NULL);
}
else
{
goto Error;
}
LOG("New access token is \"%s\"\n", GoogleOauth2AccessToken);
return TRUE;
Error:
LOG("Failed to refresh access token\n");
return FALSE;
}
BOOLEAN
ParseConfiguration(
VOID
)
/*++
Routine Description:
This routine parses the server configuration.
Arguments:
None.
Return Value:
TRUE - The configuration file was successfully parsed.
FALSE - The configuration file could not be parsed.
--*/
{
BOOLEAN Error;
FILE* ConfigFile;
toml_table_t* Config = NULL;
toml_table_t* Server;
char TomlErrorBuffer[128];
toml_datum_t TomlDatum;
Error = FALSE;
LOG("Loading configuration " CONFIG_FILE "\n");
ConfigFile = fopen(
CONFIG_FILE,
"r"
);
if ( !ConfigFile )
{
LOG("Failed to open " CONFIG_FILE ": %s (errno %d)\n", ERRNO_STRING());
goto Cleanup;
}
Config = toml_parse_file(
ConfigFile,
TomlErrorBuffer,
ARRAY_SIZE(TomlErrorBuffer)
);
fclose(ConfigFile);
LOG("Parsing config\n");
Server = toml_table_in(
Config,
"server"
);
if ( !Server )
{
LOG("Config missing [server]: %s\n", TomlErrorBuffer);
Error = TRUE;
goto Cleanup;
}
TomlDatum = toml_string_in(
Server,
"spreadsheet_id"
);
if ( !TomlDatum.ok )
{
LOG("Config missing server.spreadsheet_id: %s\n", TomlErrorBuffer);
Error = TRUE;
goto Cleanup;
}
SpreadsheetId = TomlDatum.u.s;
TomlDatum = toml_string_in(
Server,
"google_oauth2_client"
);
if ( !TomlDatum.ok )
{
LOG("Config missing server.google_oauth2_client: %s\n", TomlErrorBuffer);
Error = TRUE;
goto Cleanup;
}
GoogleOauth2ClientJson = TomlDatum.u.s;
TomlDatum = toml_string_in(
Server,
"google_oauth2_token"
);
if ( !TomlDatum.ok )
{
LOG("Config missing server.google_oauth2_token: %s\n", TomlErrorBuffer);
Error = TRUE;
goto Cleanup;
}
GoogleOauth2Token = TomlDatum.u.s;
TomlDatum = toml_string_in(
Server,
"tls_cert_path"
);
if ( !TomlDatum.ok )
{
LOG("Config missing server.tls_cert_path: %s\n", TomlErrorBuffer);
Error = TRUE;
goto Cleanup;
}
TlsCertPath = TomlDatum.u.s;
TomlDatum = toml_string_in(
Server,
"tls_key_path"
);
if ( !TomlDatum.ok )
{
LOG("Config missing server.tls_key_path: %s\n", TomlErrorBuffer);
Error = TRUE;
goto Cleanup;
}
TlsKeyPath = TomlDatum.u.s;
TomlDatum = toml_int_in(
Server,
"port"
);
if ( !TomlDatum.ok )
{
LOG("Config missing server.port: %s\n", TomlErrorBuffer);
Error = TRUE;
goto Cleanup;
}
Port = TomlDatum.u.i;
TomlDatum = toml_int_in(
Server,
"poll_rate");
if ( !TomlDatum.ok )
{
LOG("Config missing server.poll_rate: %s\n", TomlErrorBuffer);
Error = TRUE;
goto Cleanup;
}
PollRate = TomlDatum.u.i;
TomlDatum = toml_string_in(
Server,
"email"
);
if ( !TomlDatum.ok )
{
LOG("Config missing server.email: %s\n", TomlErrorBuffer);
Error = TRUE;
goto Cleanup;
}
Email = TomlDatum.u.s;
Cleanup:
if ( Config )
{
LOG("Freeing config file\n");
toml_free(Config);
}
return !Error;
}
BOOLEAN
ParseOauth2ClientJson(
VOID
)
/*++
Routine Description:
This routine parses the Google OAuth2 client JSON.
TODO: It does not have enough error checking and
assumes the file has the required fields.
Arguments:
None.
Return Value:
TRUE - Parsing the JSON was successful.
FALSE - Parsing the JSON failed.
--*/
{
BOOLEAN Error;
FILE* ClientJsonFile = NULL;
PCHAR ClientJsonBuffer = NULL;
SIZE_T ClientJsonLength;
cJSON* ClientJson = NULL;
cJSON* ClientJsonInstalled = NULL;
cJSON* JsonObject = NULL;
Error = FALSE;
LOG("Parsing OAuth2 client data in %s\n", GoogleOauth2ClientJson);
ClientJsonFile = fopen(
GoogleOauth2ClientJson,
"rb"
);
if ( !ClientJsonFile )
{
LOG("Failed to open file \"%s\" in read mode: %s (errno %d)\n", GoogleOauth2ClientJson, ERRNO_STRING());
Error = TRUE;
goto Cleanup;
}
fseek(
ClientJsonFile,
0,
SEEK_END
);
ClientJsonLength = ftell(ClientJsonFile) + 1;
fseek(
ClientJsonFile,
0,
SEEK_SET
);
ClientJsonBuffer = calloc(
ClientJsonLength,
1
);
if ( !ClientJsonBuffer )
{
LOG("Failed to allocate %zu-byte buffer for client JSON: %s (errno %d)\n", ClientJsonLength, ERRNO_STRING());
Error = TRUE;
goto Cleanup;
}
fread(
ClientJsonBuffer,
ClientJsonLength,
1,
ClientJsonFile
);
ClientJson = cJSON_Parse(ClientJsonBuffer);
if ( !ClientJson )
{
LOG("Failed to parse client JSON: %s", cJSON_GetErrorPtr());
Error = TRUE;
goto Cleanup;
}
ClientJsonInstalled = cJSON_GetObjectItem(
ClientJson,
"installed"
);
JsonObject = cJSON_GetObjectItem(
ClientJsonInstalled,
"auth_uri"
);
GoogleOauth2AuthUri = strdup(cJSON_GetStringValue(JsonObject));
JsonObject = cJSON_GetObjectItem(
ClientJsonInstalled,
"client_id"
);
GoogleOauth2ClientId = strdup(cJSON_GetStringValue(JsonObject));
JsonObject = cJSON_GetObjectItem(
ClientJsonInstalled,
"client_secret"
);
GoogleOauth2ClientSecret = strdup(cJSON_GetStringValue(JsonObject));
JsonObject = cJSON_GetObjectItem(
ClientJsonInstalled,
"token_uri"
);
GoogleOauth2TokenUri = strdup(cJSON_GetStringValue(JsonObject));
Cleanup:
if ( ClientJson )