/* * Reads a passphrase from /dev/tty with echo turned off/on. Returns the * passphrase (allocated with xmalloc). Exits if EOF is encountered. If * RP_ALLOW_STDIN is set, the passphrase will be read from stdin if no * tty is available */ char * read_passphrase(const char *prompt, int flags) { char *askpass = NULL, *ret, buf[1024]; int rppflags, use_askpass = 0, ttyfd; rppflags = (flags & RP_ECHO) ? RPP_ECHO_ON : RPP_ECHO_OFF; if (flags & RP_USE_ASKPASS) use_askpass = 1; else if (flags & RP_ALLOW_STDIN) { rppflags |= RPP_STDIN; use_askpass = 0; /*if (!isatty(STDIN_FILENO)) {*/ /*debug("read_passphrase: stdin is not a tty");*/ /*use_askpass = 1;*/ /*}*/ } else { rppflags |= RPP_REQUIRE_TTY; ttyfd = open(_PATH_TTY, O_RDWR); if (ttyfd >= 0) close(ttyfd); else { debug("read_passphrase: can't open %s: %s", _PATH_TTY, strerror(errno)); use_askpass = 1; } } if ((flags & RP_USE_ASKPASS) && getenv("DISPLAY") == NULL) return (flags & RP_ALLOW_EOF) ? NULL : xstrdup(""); if (use_askpass && getenv("DISPLAY")) { if (getenv(SSH_ASKPASS_ENV)) askpass = getenv(SSH_ASKPASS_ENV); else askpass = _PATH_SSH_ASKPASS_DEFAULT; if ((ret = ssh_askpass(askpass, prompt)) == NULL) if (!(flags & RP_ALLOW_EOF)) return xstrdup(""); return ret; } if (readpassphrase(prompt, buf, sizeof buf, rppflags) == NULL) { if (flags & RP_ALLOW_EOF) return NULL; return xstrdup(""); } ret = xstrdup(buf); memset(buf, 'x', sizeof buf); return ret; }
/* * Reads a passphrase from /dev/tty with echo turned off/on. Returns the * passphrase (allocated with xmalloc). Exits if EOF is encountered. If * RP_ALLOW_STDIN is set, the passphrase will be read from stdin if no * tty is available */ char * read_passphrase(const char *prompt, int flags) { char *askpass = NULL, *ret, buf[1024]; int rppflags, use_askpass = 0, ttyfd; rppflags = (flags & RP_ECHO) ? RPP_ECHO_ON : RPP_ECHO_OFF; if (flags & RP_ALLOW_STDIN) { if (!isatty(STDIN_FILENO)) use_askpass = 1; } else { rppflags |= RPP_REQUIRE_TTY; ttyfd = open(_PATH_TTY, O_RDWR); if (ttyfd >= 0) close(ttyfd); else use_askpass = 1; } if (use_askpass && getenv("DISPLAY")) { if (getenv(SSH_ASKPASS_ENV)) askpass = getenv(SSH_ASKPASS_ENV); else askpass = _PATH_SSH_ASKPASS_DEFAULT; if ((ret = ssh_askpass(askpass, prompt)) == NULL) if (!(flags & RP_ALLOW_EOF)) return xstrdup(""); return ret; } if (readpassphrase(prompt, buf, sizeof buf, rppflags) == NULL) { if (flags & RP_ALLOW_EOF) return NULL; return xstrdup(""); } ret = xstrdup(buf); memset(buf, 'x', sizeof buf); return ret; }
static char * ssh_askpass(char *askpass, const char *msg) { pid_t pid; size_t len; char *pass; int p[2], status, ret; char buf[1024]; if (fflush(stdout) != 0) error("ssh_askpass: fflush: %s", strerror(errno)); if (askpass == NULL) fatal("internal error: askpass undefined"); if (pipe(p) < 0) { error("ssh_askpass: pipe: %s", strerror(errno)); return NULL; } #ifdef __uClinux__ if ((pid = vfork()) < 0) { #else if ((pid = fork()) < 0) { #endif error("ssh_askpass: fork: %s", strerror(errno)); return NULL; } if (pid == 0) { seteuid(getuid()); setuid(getuid()); close(p[0]); if (dup2(p[1], STDOUT_FILENO) < 0) fatal("ssh_askpass: dup2: %s", strerror(errno)); execlp(askpass, askpass, msg, (char *) 0); fatal("ssh_askpass: exec(%s): %s", askpass, strerror(errno)); #ifdef __uClinux__ _exit(0); #else exit(0); #endif } close(p[1]); len = ret = 0; do { ret = read(p[0], buf + len, sizeof(buf) - 1 - len); if (ret == -1 && errno == EINTR) continue; if (ret <= 0) break; len += ret; } while (sizeof(buf) - 1 - len > 0); buf[len] = '\0'; close(p[0]); while (waitpid(pid, &status, 0) < 0) if (errno != EINTR) break; if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { memset(buf, 0, sizeof(buf)); return NULL; } buf[strcspn(buf, "\r\n")] = '\0'; pass = xstrdup(buf); memset(buf, 0, sizeof(buf)); return pass; } /* * Reads a passphrase from /dev/tty with echo turned off/on. Returns the * passphrase (allocated with xmalloc). Exits if EOF is encountered. If * RP_ALLOW_STDIN is set, the passphrase will be read from stdin if no * tty is available */ char * read_passphrase(const char *prompt, int flags) { char *askpass = NULL, *ret, buf[1024]; int rppflags, use_askpass = 0, ttyfd; rppflags = (flags & RP_ECHO) ? RPP_ECHO_ON : RPP_ECHO_OFF; if (flags & RP_USE_ASKPASS) use_askpass = 1; else if (flags & RP_ALLOW_STDIN) { if (!isatty(STDIN_FILENO)) { debug("read_passphrase: stdin is not a tty"); use_askpass = 1; } } else { rppflags |= RPP_REQUIRE_TTY; ttyfd = open(_PATH_TTY, O_RDWR); if (ttyfd >= 0) close(ttyfd); else { debug("read_passphrase: can't open %s: %s", _PATH_TTY, strerror(errno)); use_askpass = 1; } } if ((flags & RP_USE_ASKPASS) && getenv("DISPLAY") == NULL) return (flags & RP_ALLOW_EOF) ? NULL : xstrdup(""); if (use_askpass && getenv("DISPLAY")) { if (getenv(SSH_ASKPASS_ENV)) askpass = getenv(SSH_ASKPASS_ENV); else askpass = _PATH_SSH_ASKPASS_DEFAULT; if ((ret = ssh_askpass(askpass, prompt)) == NULL) if (!(flags & RP_ALLOW_EOF)) return xstrdup(""); return ret; } if (readpassphrase(prompt, buf, sizeof buf, rppflags) == NULL) { if (flags & RP_ALLOW_EOF) return NULL; return xstrdup(""); } ret = xstrdup(buf); memset(buf, 'x', sizeof buf); return ret; }