* SUCH DAMAGE.
*/
-#include <stdio.h>
-#include <errno.h>
-#include <unistd.h>
-#include <string.h>
-#include <stdlib.h>
-#include <syslog.h>
-#include <ctype.h>
-#include <crypt.h>
-
#include "libbb.h"
+#define SHADOW_BUFSIZE 256
+/* Retrieve encrypted password string for pw.
+ * If pw == NULL, return a string which fails password check against any
+ * password.
+ */
+#if !ENABLE_FEATURE_SHADOWPASSWDS
+#define get_passwd(pw, buffer) get_passwd(pw)
+#endif
+static const char *get_passwd(const struct passwd *pw, char buffer[SHADOW_BUFSIZE])
+{
+ const char *pass;
-/* Ask the user for a password.
- Return 1 if the user gives the correct password for entry PW,
- 0 if not. Return 1 without asking for a password if run by UID 0
- or if PW has an empty password. */
+ if (!pw)
+ return "aa"; /* "aa" will never match */
-int correct_password ( const struct passwd *pw )
+ pass = pw->pw_passwd;
+#if ENABLE_FEATURE_SHADOWPASSWDS
+ /* Using _r function to avoid pulling in static buffers */
+ if ((pass[0] == 'x' || pass[0] == '*') && !pass[1]) {
+ struct spwd spw;
+ int r;
+ /* 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, SHADOW_BUFSIZE, &result);
+ pass = (r || !result) ? "aa" : result->sp_pwdp;
+ }
+#endif
+ return pass;
+}
+
+/*
+ * Return 1 if PW has an empty password.
+ * Return 1 if the user gives the correct password for entry PW,
+ * 0 if not.
+ * NULL pw means "just fake it for login with bad username"
+ */
+int FAST_FUNC check_password(const struct passwd *pw, const char *plaintext)
{
- char *unencrypted, *encrypted, *correct;
+ IF_FEATURE_SHADOWPASSWDS(char buffer[SHADOW_BUFSIZE];)
+ char *encrypted;
+ const char *pw_pass;
+ int r;
-#ifdef CONFIG_FEATURE_SHADOWPASSWDS
- if (( strcmp ( pw-> pw_passwd, "x" ) == 0 ) || ( strcmp ( pw-> pw_passwd, "*" ) == 0 )) {
- struct spwd *sp = getspnam ( pw-> pw_name );
+ pw_pass = get_passwd(pw, buffer);
+ if (!pw_pass[0]) { /* empty password field? */
+ return 1;
+ }
- if ( !sp )
- bb_error_msg_and_die ( "\nno valid shadow password" );
+ encrypted = pw_encrypt(plaintext, /*salt:*/ pw_pass, 1);
+ r = (strcmp(encrypted, pw_pass) == 0);
+ free(encrypted);
+ return r;
+}
- correct = sp-> sp_pwdp;
- }
- else
-#endif
- correct = pw-> pw_passwd;
- if ( correct == 0 || correct[0] == '\0' )
+/* 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.
+ *
+ * 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)
+{
+ IF_FEATURE_SHADOWPASSWDS(char buffer[SHADOW_BUFSIZE];)
+ char *plaintext;
+ const char *pw_pass;
+ int r;
+
+ pw_pass = get_passwd(pw, buffer);
+ if (!pw_pass[0]) /* empty password field? */
return 1;
- unencrypted = bb_askpass ( 0, "Password: " );
- if ( !unencrypted )
- {
- return 0;
+ plaintext = bb_ask(STDIN_FILENO, timeout, prompt);
+ if (!plaintext) {
+ /* EOF (such as ^D) or error (such as ^C) or timeout */
+ return -1;
}
- encrypted = crypt ( unencrypted, correct );
- memset ( unencrypted, 0, bb_strlen ( unencrypted ));
- return ( strcmp ( encrypted, correct ) == 0 ) ? 1 : 0;
+
+ r = check_password(pw, plaintext);
+ nuke_str(plaintext);
+ return r;
+}
+
+int FAST_FUNC ask_and_check_password(const struct passwd *pw)
+{
+ return ask_and_check_password_extended(pw, 0, "Password: ");
}