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 <openssl/pem.h> /* PEM_def_callback() */ 12 #include "internal/thread_once.h" 13 #include "ui_local.h" 14 15 #ifndef BUFSIZ 16 #define BUFSIZ 256 17 #endif 18 19 int UI_UTIL_read_pw_string(char *buf, int length, const char *prompt, 20 int verify) 21 { 22 char buff[BUFSIZ]; 23 int ret; 24 25 ret = 26 UI_UTIL_read_pw(buf, buff, (length > BUFSIZ) ? BUFSIZ : length, 27 prompt, verify); 28 OPENSSL_cleanse(buff, BUFSIZ); 29 return ret; 30 } 31 32 int UI_UTIL_read_pw(char *buf, char *buff, int size, const char *prompt, 33 int verify) 34 { 35 int ok = 0; 36 UI *ui; 37 38 if (size < 1) 39 return -1; 40 41 ui = UI_new(); 42 if (ui != NULL) { 43 ok = UI_add_input_string(ui, prompt, 0, buf, 0, size - 1); 44 if (ok >= 0 && verify) 45 ok = UI_add_verify_string(ui, prompt, 0, buff, 0, size - 1, buf); 46 if (ok >= 0) 47 ok = UI_process(ui); 48 UI_free(ui); 49 } 50 if (ok > 0) 51 ok = 0; 52 return ok; 53 } 54 55 /* 56 * Wrapper around pem_password_cb, a method to help older APIs use newer 57 * ones. 58 */ 59 struct pem_password_cb_data { 60 pem_password_cb *cb; 61 int rwflag; 62 }; 63 64 static void ui_new_method_data(void *parent, void *ptr, CRYPTO_EX_DATA *ad, 65 int idx, long argl, void *argp) 66 { 67 /* 68 * Do nothing, the data is allocated externally and assigned later with 69 * CRYPTO_set_ex_data() 70 */ 71 } 72 73 static int ui_dup_method_data(CRYPTO_EX_DATA *to, const CRYPTO_EX_DATA *from, 74 void *from_d, int idx, long argl, void *argp) 75 { 76 void **pptr = (void **)from_d; 77 if (*pptr != NULL) 78 *pptr = OPENSSL_memdup(*pptr, sizeof(struct pem_password_cb_data)); 79 return 1; 80 } 81 82 static void ui_free_method_data(void *parent, void *ptr, CRYPTO_EX_DATA *ad, 83 int idx, long argl, void *argp) 84 { 85 OPENSSL_free(ptr); 86 } 87 88 static CRYPTO_ONCE get_index_once = CRYPTO_ONCE_STATIC_INIT; 89 static int ui_method_data_index = -1; 90 DEFINE_RUN_ONCE_STATIC(ui_method_data_index_init) 91 { 92 ui_method_data_index = CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_UI_METHOD, 93 0, NULL, ui_new_method_data, 94 ui_dup_method_data, 95 ui_free_method_data); 96 return 1; 97 } 98 99 static int ui_open(UI *ui) 100 { 101 return 1; 102 } 103 static int ui_read(UI *ui, UI_STRING *uis) 104 { 105 switch (UI_get_string_type(uis)) { 106 case UIT_PROMPT: 107 { 108 char result[PEM_BUFSIZE + 1]; 109 const struct pem_password_cb_data *data = 110 UI_method_get_ex_data(UI_get_method(ui), ui_method_data_index); 111 int maxsize = UI_get_result_maxsize(uis); 112 int len = data->cb(result, 113 maxsize > PEM_BUFSIZE ? PEM_BUFSIZE : maxsize, 114 data->rwflag, UI_get0_user_data(ui)); 115 116 if (len >= 0) 117 result[len] = '\0'; 118 if (len <= 0) 119 return len; 120 if (UI_set_result_ex(ui, uis, result, len) >= 0) 121 return 1; 122 return 0; 123 } 124 case UIT_VERIFY: 125 case UIT_NONE: 126 case UIT_BOOLEAN: 127 case UIT_INFO: 128 case UIT_ERROR: 129 break; 130 } 131 return 1; 132 } 133 static int ui_write(UI *ui, UI_STRING *uis) 134 { 135 return 1; 136 } 137 static int ui_close(UI *ui) 138 { 139 return 1; 140 } 141 142 UI_METHOD *UI_UTIL_wrap_read_pem_callback(pem_password_cb *cb, int rwflag) 143 { 144 struct pem_password_cb_data *data = NULL; 145 UI_METHOD *ui_method = NULL; 146 147 if ((data = OPENSSL_zalloc(sizeof(*data))) == NULL 148 || (ui_method = UI_create_method("PEM password callback wrapper")) == NULL 149 || UI_method_set_opener(ui_method, ui_open) < 0 150 || UI_method_set_reader(ui_method, ui_read) < 0 151 || UI_method_set_writer(ui_method, ui_write) < 0 152 || UI_method_set_closer(ui_method, ui_close) < 0 153 || !RUN_ONCE(&get_index_once, ui_method_data_index_init) 154 || UI_method_set_ex_data(ui_method, ui_method_data_index, data) < 0) { 155 UI_destroy_method(ui_method); 156 OPENSSL_free(data); 157 return NULL; 158 } 159 data->rwflag = rwflag; 160 data->cb = cb != NULL ? cb : PEM_def_callback; 161 162 return ui_method; 163 } 164