diff options
Diffstat (limited to 'vendor/golang.org/x/crypto/ssh/test/sshd_test_pw.c')
-rw-r--r-- | vendor/golang.org/x/crypto/ssh/test/sshd_test_pw.c | 173 |
1 files changed, 0 insertions, 173 deletions
diff --git a/vendor/golang.org/x/crypto/ssh/test/sshd_test_pw.c b/vendor/golang.org/x/crypto/ssh/test/sshd_test_pw.c deleted file mode 100644 index 2794a563a..000000000 --- a/vendor/golang.org/x/crypto/ssh/test/sshd_test_pw.c +++ /dev/null @@ -1,173 +0,0 @@ -// Copyright 2017 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -// sshd_test_pw.c -// Wrapper to inject test password data for sshd PAM authentication -// -// This wrapper implements custom versions of getpwnam, getpwnam_r, -// getspnam and getspnam_r. These functions first call their real -// libc versions, then check if the requested user matches test user -// specified in env variable TEST_USER and if so replace the password -// with crypted() value of TEST_PASSWD env variable. -// -// Compile: -// gcc -Wall -shared -o sshd_test_pw.so -fPIC sshd_test_pw.c -// -// Compile with debug: -// gcc -DVERBOSE -Wall -shared -o sshd_test_pw.so -fPIC sshd_test_pw.c -// -// Run sshd: -// LD_PRELOAD="sshd_test_pw.so" TEST_USER="..." TEST_PASSWD="..." sshd ... - -// +build ignore - -#define _GNU_SOURCE -#include <string.h> -#include <pwd.h> -#include <shadow.h> -#include <dlfcn.h> -#include <stdlib.h> -#include <unistd.h> -#include <stdio.h> - -#ifdef VERBOSE -#define DEBUG(X...) fprintf(stderr, X) -#else -#define DEBUG(X...) while (0) { } -#endif - -/* crypt() password */ -static char * -pwhash(char *passwd) { - return strdup(crypt(passwd, "$6$")); -} - -/* Pointers to real functions in libc */ -static struct passwd * (*real_getpwnam)(const char *) = NULL; -static int (*real_getpwnam_r)(const char *, struct passwd *, char *, size_t, struct passwd **) = NULL; -static struct spwd * (*real_getspnam)(const char *) = NULL; -static int (*real_getspnam_r)(const char *, struct spwd *, char *, size_t, struct spwd **) = NULL; - -/* Cached test user and test password */ -static char *test_user = NULL; -static char *test_passwd_hash = NULL; - -static void -init(void) { - /* Fetch real libc function pointers */ - real_getpwnam = dlsym(RTLD_NEXT, "getpwnam"); - real_getpwnam_r = dlsym(RTLD_NEXT, "getpwnam_r"); - real_getspnam = dlsym(RTLD_NEXT, "getspnam"); - real_getspnam_r = dlsym(RTLD_NEXT, "getspnam_r"); - - /* abort if env variables are not defined */ - if (getenv("TEST_USER") == NULL || getenv("TEST_PASSWD") == NULL) { - fprintf(stderr, "env variables TEST_USER and TEST_PASSWD are missing\n"); - abort(); - } - - /* Fetch test user and test password from env */ - test_user = strdup(getenv("TEST_USER")); - test_passwd_hash = pwhash(getenv("TEST_PASSWD")); - - DEBUG("sshd_test_pw init():\n"); - DEBUG("\treal_getpwnam: %p\n", real_getpwnam); - DEBUG("\treal_getpwnam_r: %p\n", real_getpwnam_r); - DEBUG("\treal_getspnam: %p\n", real_getspnam); - DEBUG("\treal_getspnam_r: %p\n", real_getspnam_r); - DEBUG("\tTEST_USER: '%s'\n", test_user); - DEBUG("\tTEST_PASSWD: '%s'\n", getenv("TEST_PASSWD")); - DEBUG("\tTEST_PASSWD_HASH: '%s'\n", test_passwd_hash); -} - -static int -is_test_user(const char *name) { - if (test_user != NULL && strcmp(test_user, name) == 0) - return 1; - return 0; -} - -/* getpwnam */ - -struct passwd * -getpwnam(const char *name) { - struct passwd *pw; - - DEBUG("sshd_test_pw getpwnam(%s)\n", name); - - if (real_getpwnam == NULL) - init(); - if ((pw = real_getpwnam(name)) == NULL) - return NULL; - - if (is_test_user(name)) - pw->pw_passwd = strdup(test_passwd_hash); - - return pw; -} - -/* getpwnam_r */ - -int -getpwnam_r(const char *name, - struct passwd *pwd, - char *buf, - size_t buflen, - struct passwd **result) { - int r; - - DEBUG("sshd_test_pw getpwnam_r(%s)\n", name); - - if (real_getpwnam_r == NULL) - init(); - if ((r = real_getpwnam_r(name, pwd, buf, buflen, result)) != 0 || *result == NULL) - return r; - - if (is_test_user(name)) - pwd->pw_passwd = strdup(test_passwd_hash); - - return 0; -} - -/* getspnam */ - -struct spwd * -getspnam(const char *name) { - struct spwd *sp; - - DEBUG("sshd_test_pw getspnam(%s)\n", name); - - if (real_getspnam == NULL) - init(); - if ((sp = real_getspnam(name)) == NULL) - return NULL; - - if (is_test_user(name)) - sp->sp_pwdp = strdup(test_passwd_hash); - - return sp; -} - -/* getspnam_r */ - -int -getspnam_r(const char *name, - struct spwd *spbuf, - char *buf, - size_t buflen, - struct spwd **spbufp) { - int r; - - DEBUG("sshd_test_pw getspnam_r(%s)\n", name); - - if (real_getspnam_r == NULL) - init(); - if ((r = real_getspnam_r(name, spbuf, buf, buflen, spbufp)) != 0) - return r; - - if (is_test_user(name)) - spbuf->sp_pwdp = strdup(test_passwd_hash); - - return r; -} |