84 lines
1.8 KiB
C
84 lines
1.8 KiB
C
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#define _GNU_SOURCE
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#include <ioall.h>
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#include <grp.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <pwd.h>
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#include <sys/stat.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/fsuid.h>
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#include <gui-fatal.h>
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#include <errno.h>
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#include "filecopy.h"
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#define INCOMING_DIR_ROOT "/home/user/incoming"
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int prepare_creds_return_uid(char *username)
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{
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struct passwd *pwd;
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pwd = getpwnam(username);
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if (!pwd) {
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perror("getpwnam");
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exit(1);
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}
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setenv("HOME", pwd->pw_dir, 1);
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setenv("USER", username, 1);
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setgid(pwd->pw_gid);
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initgroups(username, pwd->pw_gid);
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setfsuid(pwd->pw_uid);
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return pwd->pw_uid;
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}
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void wait_for_child(int statusfd)
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{
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int status;
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if (read(statusfd, &status, sizeof status)!=sizeof status)
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gui_fatal("File copy error: Internal error reading status from unpacker");
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errno = status;
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switch (status) {
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case LEGAL_EOF: break;
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case 0: gui_fatal("File copy: Connection terminated unexpectedly"); break;
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case EINVAL: gui_fatal("File copy: Corrupted data from packer"); break;
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case EEXIST: gui_fatal("File copy: not overwriting existing file. Clean ~/incoming, and retry copy"); break;
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default: gui_fatal("File copy");
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}
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}
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extern void do_unpack(int);
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int main(int argc, char ** argv)
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{
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char *incoming_dir;
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int pipefds[2];
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int uid;
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pipe(pipefds);
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uid = prepare_creds_return_uid("user");
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mkdir(INCOMING_DIR_ROOT, 0700);
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asprintf(&incoming_dir, "%s/from-%s", INCOMING_DIR_ROOT, argv[1]);
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mkdir(incoming_dir, 0700);
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if (chdir(incoming_dir))
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gui_fatal("Error chdir to %s", incoming_dir);
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switch (fork()) {
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case -1:
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perror("fork");
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exit(1);
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case 0:
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if (chroot(incoming_dir)) //impossible
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gui_fatal("Error chroot to %s", incoming_dir);
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setuid(uid);
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close(pipefds[0]);
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do_unpack(pipefds[1]);
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exit(0);
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default:;
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}
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setuid(uid);
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close(pipefds[1]);
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wait_for_child(pipefds[0]);
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return 0;
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}
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