1 /* 2 * Copyright 2002-2016 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the OpenSSL license (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 #include <string.h> 11 #include "internal/thread_once.h" 12 #include "ui_locl.h" 13 14 #ifndef BUFSIZ 15 #define BUFSIZ 256 16 #endif 17 18 int UI_UTIL_read_pw_string(char *buf, int length, const char *prompt, 19 int verify) 20 { 21 char buff[BUFSIZ]; 22 int ret; 23 24 ret = 25 UI_UTIL_read_pw(buf, buff, (length > BUFSIZ) ? BUFSIZ : length, 26 prompt, verify); 27 OPENSSL_cleanse(buff, BUFSIZ); 28 return ret; 29 } 30 31 int UI_UTIL_read_pw(char *buf, char *buff, int size, const char *prompt, 32 int verify) 33 { 34 int ok = 0; 35 UI *ui; 36 37 if (size < 1) 38 return -1; 39 40 ui = UI_new(); 41 if (ui != NULL) { 42 ok = UI_add_input_string(ui, prompt, 0, buf, 0, size - 1); 43 if (ok >= 0 && verify) 44 ok = UI_add_verify_string(ui, prompt, 0, buff, 0, size - 1, buf); 45 if (ok >= 0) 46 ok = UI_process(ui); 47 UI_free(ui); 48 } 49 if (ok > 0) 50 ok = 0; 51 return ok; 52 } 53 54 /* 55 * Wrapper around pem_password_cb, a method to help older APIs use newer 56 * ones. 57 */ 58 struct pem_password_cb_data { 59 pem_password_cb *cb; 60 int rwflag; 61 }; 62 63 static void ui_new_method_data(void *parent, void *ptr, CRYPTO_EX_DATA *ad, 64 int idx, long argl, void *argp) 65 { 66 /* 67 * Do nothing, the data is allocated externally and assigned later with 68 * CRYPTO_set_ex_data() 69 */ 70 } 71 72 static int ui_dup_method_data(CRYPTO_EX_DATA *to, const CRYPTO_EX_DATA *from, 73 void *from_d, int idx, long argl, void *argp) 74 { 75 void **pptr = (void **)from_d; 76 if (*pptr != NULL) 77 *pptr = OPENSSL_memdup(*pptr, sizeof(struct pem_password_cb_data)); 78 return 1; 79 } 80 81 static void ui_free_method_data(void *parent, void *ptr, CRYPTO_EX_DATA *ad, 82 int idx, long argl, void *argp) 83 { 84 OPENSSL_free(ptr); 85 } 86 87 static CRYPTO_ONCE get_index_once = CRYPTO_ONCE_STATIC_INIT; 88 static int ui_method_data_index = -1; 89 DEFINE_RUN_ONCE_STATIC(ui_method_data_index_init) 90 { 91 ui_method_data_index = CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_UI_METHOD, 92 0, NULL, ui_new_method_data, 93 ui_dup_method_data, 94 ui_free_method_data); 95 return 1; 96 } 97 98 static int ui_open(UI *ui) 99 { 100 return 1; 101 } 102 static int ui_read(UI *ui, UI_STRING *uis) 103 { 104 switch (UI_get_string_type(uis)) { 105 case UIT_PROMPT: 106 { 107 char result[PEM_BUFSIZE + 1]; 108 const struct pem_password_cb_data *data = 109 UI_method_get_ex_data(UI_get_method(ui), ui_method_data_index); 110 int maxsize = UI_get_result_maxsize(uis); 111 int len = data->cb(result, 112 maxsize > PEM_BUFSIZE ? PEM_BUFSIZE : maxsize, 113 data->rwflag, UI_get0_user_data(ui)); 114 115 if (len >= 0) 116 result[len] = '\0'; 117 if (len <= 0) 118 return len; 119 if (UI_set_result_ex(ui, uis, result, len) >= 0) 120 return 1; 121 return 0; 122 } 123 case UIT_VERIFY: 124 case UIT_NONE: 125 case UIT_BOOLEAN: 126 case UIT_INFO: 127 case UIT_ERROR: 128 break; 129 } 130 return 1; 131 } 132 static int ui_write(UI *ui, UI_STRING *uis) 133 { 134 return 1; 135 } 136 static int ui_close(UI *ui) 137 { 138 return 1; 139 } 140 141 UI_METHOD *UI_UTIL_wrap_read_pem_callback(pem_password_cb *cb, int rwflag) 142 { 143 struct pem_password_cb_data *data = NULL; 144 UI_METHOD *ui_method = NULL; 145 146 if ((data = OPENSSL_zalloc(sizeof(*data))) == NULL 147 || (ui_method = UI_create_method("PEM password callback wrapper")) == NULL 148 || UI_method_set_opener(ui_method, ui_open) < 0 149 || UI_method_set_reader(ui_method, ui_read) < 0 150 || UI_method_set_writer(ui_method, ui_write) < 0 151 || UI_method_set_closer(ui_method, ui_close) < 0 152 || !RUN_ONCE(&get_index_once, ui_method_data_index_init) 153 || UI_method_set_ex_data(ui_method, ui_method_data_index, data) < 0) { 154 UI_destroy_method(ui_method); 155 OPENSSL_free(data); 156 return NULL; 157 } 158 data->rwflag = rwflag; 159 data->cb = cb; 160 161 return ui_method; 162 } 163