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Diffstat (limited to 'doc/examples/ex-serv-srp.c')
| -rw-r--r-- | doc/examples/ex-serv-srp.c | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/doc/examples/ex-serv-srp.c b/doc/examples/ex-serv-srp.c new file mode 100644 index 0000000..7686a8f --- /dev/null +++ b/doc/examples/ex-serv-srp.c @@ -0,0 +1,179 @@ +/* This example code is placed in the public domain. */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <stdio.h> +#include <stdlib.h> +#include <errno.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <arpa/inet.h> +#include <netinet/in.h> +#include <string.h> +#include <unistd.h> +#include <gnutls/gnutls.h> + +#define SRP_PASSWD "tpasswd" +#define SRP_PASSWD_CONF "tpasswd.conf" + +#define KEYFILE "key.pem" +#define CERTFILE "cert.pem" +#define CAFILE "/etc/ssl/certs/ca-certificates.crt" + +#define LOOP_CHECK(rval, cmd) \ + do { \ + rval = cmd; \ + } while(rval == GNUTLS_E_AGAIN || rval == GNUTLS_E_INTERRUPTED) + +/* This is a sample TLS-SRP echo server. + */ + +#define SOCKET_ERR(err,s) if(err==-1) {perror(s);return(1);} +#define MAX_BUF 1024 +#define PORT 5556 /* listen to 5556 port */ + +int main(void) +{ + int err, listen_sd; + int sd, ret; + struct sockaddr_in sa_serv; + struct sockaddr_in sa_cli; + socklen_t client_len; + char topbuf[512]; + gnutls_session_t session; + gnutls_srp_server_credentials_t srp_cred; + gnutls_certificate_credentials_t cert_cred; + char buffer[MAX_BUF + 1]; + int optval = 1; + char name[256]; + + strcpy(name, "Echo Server"); + + if (gnutls_check_version("3.1.4") == NULL) { + fprintf(stderr, "GnuTLS 3.1.4 or later is required for this example\n"); + exit(1); + } + + /* for backwards compatibility with gnutls < 3.3.0 */ + gnutls_global_init(); + + /* SRP_PASSWD a password file (created with the included srptool utility) + */ + gnutls_srp_allocate_server_credentials(&srp_cred); + gnutls_srp_set_server_credentials_file(srp_cred, SRP_PASSWD, + SRP_PASSWD_CONF); + + gnutls_certificate_allocate_credentials(&cert_cred); + gnutls_certificate_set_x509_trust_file(cert_cred, CAFILE, + GNUTLS_X509_FMT_PEM); + gnutls_certificate_set_x509_key_file(cert_cred, CERTFILE, KEYFILE, + GNUTLS_X509_FMT_PEM); + + /* TCP socket operations + */ + listen_sd = socket(AF_INET, SOCK_STREAM, 0); + SOCKET_ERR(listen_sd, "socket"); + + memset(&sa_serv, '\0', sizeof(sa_serv)); + sa_serv.sin_family = AF_INET; + sa_serv.sin_addr.s_addr = INADDR_ANY; + sa_serv.sin_port = htons(PORT); /* Server Port number */ + + setsockopt(listen_sd, SOL_SOCKET, SO_REUSEADDR, (void *) &optval, + sizeof(int)); + + err = + bind(listen_sd, (struct sockaddr *) &sa_serv, sizeof(sa_serv)); + SOCKET_ERR(err, "bind"); + err = listen(listen_sd, 1024); + SOCKET_ERR(err, "listen"); + + printf("%s ready. Listening to port '%d'.\n\n", name, PORT); + + client_len = sizeof(sa_cli); + for (;;) { + gnutls_init(&session, GNUTLS_SERVER); + gnutls_priority_set_direct(session, + "NORMAL" + ":-KX-ALL:+SRP:+SRP-DSS:+SRP-RSA", + NULL); + gnutls_credentials_set(session, GNUTLS_CRD_SRP, srp_cred); + /* for the certificate authenticated ciphersuites. + */ + gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, + cert_cred); + + /* We don't request any certificate from the client. + * If we did we would need to verify it. One way of + * doing that is shown in the "Verifying a certificate" + * example. + */ + gnutls_certificate_server_set_request(session, + GNUTLS_CERT_IGNORE); + + sd = accept(listen_sd, (struct sockaddr *) &sa_cli, + &client_len); + + printf("- connection from %s, port %d\n", + inet_ntop(AF_INET, &sa_cli.sin_addr, topbuf, + sizeof(topbuf)), ntohs(sa_cli.sin_port)); + + gnutls_transport_set_int(session, sd); + + LOOP_CHECK(ret, gnutls_handshake(session)); + if (ret < 0) { + close(sd); + gnutls_deinit(session); + fprintf(stderr, + "*** Handshake has failed (%s)\n\n", + gnutls_strerror(ret)); + continue; + } + printf("- Handshake was completed\n"); + printf("- User %s was connected\n", + gnutls_srp_server_get_username(session)); + + /* print_info(session); */ + + for (;;) { + LOOP_CHECK(ret, gnutls_record_recv(session, buffer, MAX_BUF)); + + if (ret == 0) { + printf + ("\n- Peer has closed the GnuTLS connection\n"); + break; + } else if (ret < 0 + && gnutls_error_is_fatal(ret) == 0) { + fprintf(stderr, "*** Warning: %s\n", + gnutls_strerror(ret)); + } else if (ret < 0) { + fprintf(stderr, "\n*** Received corrupted " + "data(%d). Closing the connection.\n\n", + ret); + break; + } else if (ret > 0) { + /* echo data back to the client + */ + gnutls_record_send(session, buffer, ret); + } + } + printf("\n"); + /* do not wait for the peer to close the connection. */ + LOOP_CHECK(ret, gnutls_bye(session, GNUTLS_SHUT_WR)); + + close(sd); + gnutls_deinit(session); + + } + close(listen_sd); + + gnutls_srp_free_server_credentials(srp_cred); + gnutls_certificate_free_credentials(cert_cred); + + gnutls_global_deinit(); + + return 0; + +} |