#include "libbb.h"
/* Ask the user for a password.
+ * Return 1 without asking if PW has an empty password.
+ * Return -1 on EOF, error while reading input, or timeout.
* Return 1 if the user gives the correct password for entry PW,
- * 0 if not. Return 1 without asking if PW has an empty password.
+ * 0 if not.
*
- * NULL pw means "just fake it for login with bad username" */
-
-int correct_password(const struct passwd *pw)
+ * NULL pw means "just fake it for login with bad username"
+ */
+int FAST_FUNC ask_and_check_password_extended(const struct passwd *pw,
+ int timeout, const char *prompt)
{
char *unencrypted, *encrypted;
const char *correct;
-#if ENABLE_FEATURE_SHADOWPASSWDS
- /* Using _r function to avoid pulling in static buffers */
- struct spwd spw;
- struct spwd *result;
- char buffer[256];
-#endif
-
- /* fake salt. crypt() can choke otherwise.
- * (bb_banner's first two chars are letters and thus are valid salt) */
+ int r;
+ /* fake salt. crypt() can choke otherwise. */
correct = "aa";
if (!pw) {
/* "aa" will never match */
}
correct = pw->pw_passwd;
#if ENABLE_FEATURE_SHADOWPASSWDS
- if (LONE_CHAR(pw->pw_passwd, 'x') || LONE_CHAR(pw->pw_passwd, '*')) {
- if (getspnam_r(pw->pw_name, &spw, buffer, sizeof(buffer), &result))
- bb_error_msg("no valid shadow password, checking ordinary one");
- else
- correct = spw.sp_pwdp;
+ /* Using _r function to avoid pulling in static buffers */
+ if ((correct[0] == 'x' || correct[0] == '*') && !correct[1]) {
+ struct spwd spw;
+ char buffer[256];
+ /* getspnam_r may return 0 yet set result to NULL.
+ * At least glibc 2.4 does this. Be extra paranoid here. */
+ struct spwd *result = NULL;
+ r = getspnam_r(pw->pw_name, &spw, buffer, sizeof(buffer), &result);
+ correct = (r || !result) ? "aa" : result->sp_pwdp;
}
#endif
- if (!correct || correct[0] == '\0')
+ if (!correct[0]) /* empty password field? */
return 1;
fake_it:
- unencrypted = bb_askpass(0, "Password: ");
+ unencrypted = bb_ask(STDIN_FILENO, timeout, prompt);
if (!unencrypted) {
- return 0;
+ /* EOF (such as ^D) or error (such as ^C) or timeout */
+ return -1;
}
- encrypted = crypt(unencrypted, correct);
- memset(unencrypted, 0, strlen(unencrypted));
- return strcmp(encrypted, correct) == 0;
+ encrypted = pw_encrypt(unencrypted, correct, 1);
+ r = (strcmp(encrypted, correct) == 0);
+ free(encrypted);
+ nuke_str(unencrypted);
+ return r;
+}
+
+int FAST_FUNC ask_and_check_password(const struct passwd *pw)
+{
+ return ask_and_check_password_extended(pw, 0, "Password: ");
}