60 lines
1.9 KiB
Diff
60 lines
1.9 KiB
Diff
diff -u -r ../dropbear-2019.77/svr-authpasswd.c ./svr-authpasswd.c
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--- ../dropbear-2019.77/svr-authpasswd.c 2019-03-23 13:46:29.000000000 +0000
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+++ ./svr-authpasswd.c 2019-03-24 22:40:59.586161245 +0000
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@@ -33,28 +33,13 @@
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#if DROPBEAR_SVR_PASSWORD_AUTH
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-/* not constant time when strings are differing lengths.
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- string content isn't leaked, and crypt hashes are predictable length. */
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-static int constant_time_strcmp(const char* a, const char* b) {
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- size_t la = strlen(a);
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- size_t lb = strlen(b);
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-
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- if (la != lb) {
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- return 1;
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- }
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-
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- return constant_time_memcmp(a, b, la);
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-}
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+#include <termux-auth.h>
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/* Process a password auth request, sending success or failure messages as
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* appropriate */
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void svr_auth_password(int valid_user) {
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-
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- char * passwdcrypt = NULL; /* the crypt from /etc/passwd or /etc/shadow */
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- char * testcrypt = NULL; /* crypt generated from the user's password sent */
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- char * password = NULL;
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- unsigned int passwordlen;
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- unsigned int changepw;
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+ char *password;
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+ unsigned int changepw, passwordlen;
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/* check if client wants to change password */
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changepw = buf_getbool(ses.payload);
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@@ -65,6 +50,7 @@
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}
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password = buf_getstring(ses.payload, &passwordlen);
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+#ifndef __ANDROID__
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if (valid_user && passwordlen <= DROPBEAR_MAX_PASSWORD_LEN) {
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/* the first bytes of passwdcrypt are the salt */
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passwdcrypt = ses.authstate.pw_passwd;
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@@ -106,6 +92,15 @@
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}
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if (constant_time_strcmp(testcrypt, passwdcrypt) == 0) {
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+#else /* __ANDROID__ */
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+ /* check if password is valid */
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+ if (termux_auth(ses.authstate.pw_name, password)) {
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+ if (!ses.authstate.pw_name) {
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+ dropbear_log(LOG_WARNING, "Login name is NULL");
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+ send_msg_userauth_failure(0, 1);
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+ return;
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+ }
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+#endif /* __ANDROID__ */
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if (svr_opts.multiauthmethod && (ses.authstate.authtypes & ~AUTH_TYPE_PASSWORD)) {
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/* successful password authentication, but extra auth required */
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dropbear_log(LOG_NOTICE,
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