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Implemented basic SSL

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This commit is contained in:
Lorenz Stechauner
2020-12-11 16:25:26 +01:00
parent f98ffc7077
commit 0bf8c0ccc3
4 changed files with 112 additions and 25 deletions
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2
Makefile
View File

@@ -8,7 +8,7 @@ packages:
compile:
@echo "Compiling..."
@mkdir -p bin
gcc src/necronda-server.c -o bin/necronda-server -std=c11 -D_POSIX_C_SOURCE
gcc src/necronda-server.c -o bin/necronda-server -std=c11 -D_POSIX_C_SOURCE -lssl -lcrypto
@echo "Finished compiling!"
install: | packages update compile

39
src/client.c
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@@ -40,27 +40,34 @@ int client_request_handler() {
return 0;
}
int client_connection_handler(int client) {
char buf1[256];
char buf2[256];
int client_connection_handler(sock *client) {
int ret;
print("Connection accepted from %s (%s) [%s]", client_addr_str, client_addr_str, "N/A");
sprintf(buf1, "Hello World!\nYour address is: %s\n", client_addr_str);
send(client, buf1, strlen(buf1), 0);
int len = -1;
while (len == -1) {
len = recv(client, &buf1, sizeof(buf1), 0);
}
sprintf(buf2, "Thank you, %.*s!\nGood bye!\n", len, buf1);
send(client, buf2, strlen(buf2), 0);
if (client->enc) {
client->ssl = SSL_new(client->ctx);
SSL_set_fd(client->ssl, client->socket);
close(client);
ret = SSL_accept(client->ssl);
if (ret <= 0) {
print(ERR_STR "Unable to perform handshake: %s" CLR_STR, ssl_get_error(client->ssl, ret));
goto close;
}
}
close:
if (client->enc) {
SSL_shutdown(client->ssl);
}
shutdown(client->socket, SHUT_RDWR);
close(client->socket);
print("Connection closed");
return 0;
}
int client_handler(int client, long client_num, struct sockaddr_in6 *client_addr) {
int client_handler(sock *client, long client_num, struct sockaddr_in6 *client_addr) {
int ret;
struct sockaddr_in6 *server_addr;
struct sockaddr_storage server_addr_storage;
@@ -78,7 +85,7 @@ int client_handler(int client, long client_num, struct sockaddr_in6 *client_addr
}
socklen_t len = sizeof(server_addr_storage);
getsockname(client, (struct sockaddr *) &server_addr_storage, &len);
getsockname(client->socket, (struct sockaddr *) &server_addr_storage, &len);
server_addr = (struct sockaddr_in6 *) &server_addr_storage;
server_addr_str_ptr = malloc(INET6_ADDRSTRLEN);
inet_ntop(server_addr->sin6_family, (void *) &server_addr->sin6_addr, server_addr_str_ptr, INET6_ADDRSTRLEN);
@@ -90,10 +97,10 @@ int client_handler(int client, long client_num, struct sockaddr_in6 *client_addr
log_base_prefix = malloc(256);
sprintf(log_base_prefix, "[%24s][%s%4i%s]%s[%*s][%5i]%s ",
server_addr_str, R_STR, ntohs(server_addr->sin6_port), CLR_STR,
server_addr_str, client->enc ? HTTPS_STR : HTTP_STR, ntohs(server_addr->sin6_port), CLR_STR,
color_table[client_num % 6], INET_ADDRSTRLEN, client_addr_str, ntohs(client_addr->sin6_port), CLR_STR);
int ret = client_connection_handler(client);
ret = client_connection_handler(client);
free(client_addr_str_ptr);
free(server_addr_str_ptr);
free(log_base_prefix);

75
src/necronda-server.c
View File

@@ -24,6 +24,47 @@
int active = 1;
void openssl_init() {
SSL_library_init();
SSL_load_error_strings();
ERR_load_BIO_strings();
OpenSSL_add_all_algorithms();
}
char *ssl_get_error(SSL *ssl, int ret) {
if (ret > 0) {
return NULL;
}
unsigned long ret2 = ERR_get_error();
char *err2 = strerror(errno);
char *err1 = (char *) ERR_reason_error_string(ret2);
switch (SSL_get_error(ssl, ret)) {
case SSL_ERROR_NONE:
return "none";
case SSL_ERROR_ZERO_RETURN:
return "closed";
case SSL_ERROR_WANT_READ:
return "want read";
case SSL_ERROR_WANT_WRITE:
return "want write";
case SSL_ERROR_WANT_CONNECT:
return "want connect";
case SSL_ERROR_WANT_ACCEPT:
return "want accept";
case SSL_ERROR_WANT_X509_LOOKUP:
return "want x509 lookup";
case SSL_ERROR_SYSCALL:
return ((ret2 == 0) ? ((ret == 0) ? "protocol violation" : err2) : err1);
case SSL_ERROR_SSL:
return err1;
default:
return "unknown error";
}
}
void destroy() {
fprintf(stderr, "\n" ERR_STR "Terminating forcefully!" CLR_STR "\n");
int status = 0;
@@ -97,7 +138,8 @@ int main(int argc, const char *argv[]) {
int ready_sockets_num = 0;
long client_num = 0;
int client;
int client_fd;
sock client;
struct sockaddr_in6 client_addr;
unsigned int client_addr_len = sizeof(client_addr);
@@ -139,7 +181,24 @@ int main(int argc, const char *argv[]) {
signal(SIGINT, terminate);
signal(SIGTERM, terminate);
// TODO implement TLS server side handshake
openssl_init();
client.ctx = SSL_CTX_new(TLS_server_method());
SSL_CTX_set_options(client.ctx, SSL_OP_SINGLE_DH_USE);
SSL_CTX_set_verify(client.ctx, SSL_VERIFY_NONE, NULL);
SSL_CTX_set_min_proto_version(client.ctx, TLS1_VERSION);
SSL_CTX_set_mode(client.ctx, SSL_MODE_ENABLE_PARTIAL_WRITE);
SSL_CTX_set_cipher_list(client.ctx, "HIGH:!aNULL:!kRSA:!PSK:!SRP:!MD5:!RC4");
SSL_CTX_set_ecdh_auto(client.ctx, 1);
if (SSL_CTX_use_certificate_chain_file(client.ctx, "/home/lorenz/cert/chakotay.pem") != 1) {
fprintf(stderr, ERR_STR "Unable to load certificate chain file: %s" CLR_STR "\n", ERR_reason_error_string(ERR_get_error()));
return 1;
}
if (SSL_CTX_use_PrivateKey_file(client.ctx, "/home/lorenz/cert/priv/chakotay.key", SSL_FILETYPE_PEM) != 1) {
fprintf(stderr, ERR_STR "Unable to load private key file: %s" CLR_STR "\n", ERR_reason_error_string(ERR_get_error()));
return 1;
}
for (int i = 0; i < NUM_SOCKETS; i++) {
if (listen(SOCKETS[i], LISTEN_BACKLOG) == -1) {
@@ -168,8 +227,8 @@ int main(int argc, const char *argv[]) {
for (int i = 0; i < NUM_SOCKETS; i++) {
if (FD_ISSET(SOCKETS[i], &read_socket_fds)) {
client = accept(SOCKETS[i], (struct sockaddr *) &client_addr, &client_addr_len);
if (client == -1) {
client_fd = accept(SOCKETS[i], (struct sockaddr *) &client_addr, &client_addr_len);
if (client_fd == -1) {
fprintf(parent_stderr, ERR_STR "Unable to accept connection: %s" CLR_STR "\n", strerror(errno));
continue;
}
@@ -179,11 +238,15 @@ int main(int argc, const char *argv[]) {
// child
signal(SIGINT, SIG_IGN);
signal(SIGTERM, SIG_IGN);
return client_handler(client, client_num, &client_addr);
client.socket = client_fd;
client.enc = i == 1;
return client_handler(&client, client_num, &client_addr);
} else if (pid > 0) {
// parent
client_num++;
close(client);
close(client_fd);
for (int j = 0; j < MAX_CHILDREN; j++) {
if (CHILDREN[j] == 0) {
CHILDREN[j] = pid;

21
src/necronda-server.h
View File

@@ -10,6 +10,13 @@
#include <sys/types.h>
#include <stdio.h>
#include <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/pem.h>
#include <openssl/ssl.h>
#include <openssl/conf.h>
#include <openssl/engine.h>
#include <openssl/dh.h>
#define NUM_SOCKETS 2
@@ -18,13 +25,23 @@
#define ERR_STR "\x1B[1;31m"
#define CLR_STR "\x1B[0m"
#define R_STR "\x1B[31m"
#define G_STR "\x1B[32m"
#define HTTP_STR "\x1B[1;31m"
#define HTTPS_STR "\x1B[1;32m"
int SOCKETS[NUM_SOCKETS];
pid_t CHILDREN[MAX_CHILDREN];
FILE *parent_stdout, *parent_stderr;
typedef struct {
int enc:1;
int socket;
SSL_CTX *ctx;
SSL *ssl;
BIO *bio_in;
BIO *bio_out;
} sock;
char *ssl_get_error(SSL *ssl, int ret);
#endif //NECRONDA_SERVER_NECRONDA_SERVER_H