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0f113f3e | 1 | /* |
21dcbebc | 2 | * Copyright 2001-2016 The OpenSSL Project Authors. All Rights Reserved. |
a63d5eaa | 3 | * |
21dcbebc RS |
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 | |
a63d5eaa RL |
8 | */ |
9 | ||
10 | #ifndef HEADER_UI_H | |
0f113f3e | 11 | # define HEADER_UI_H |
a63d5eaa | 12 | |
98186eb4 | 13 | # include <openssl/opensslconf.h> |
a63d5eaa | 14 | |
48feaceb RL |
15 | # if OPENSSL_API_COMPAT < 0x10100000L |
16 | # include <openssl/crypto.h> | |
17 | # endif | |
18 | # include <openssl/safestack.h> | |
19 | # include <openssl/pem.h> | |
20 | # include <openssl/ossl_typ.h> | |
21 | # include <openssl/uierr.h> | |
22 | ||
23 | /* For compatibility reasons, the macro OPENSSL_NO_UI is currently retained */ | |
24 | # if OPENSSL_API_COMPAT < 0x10200000L | |
25 | # ifdef OPENSSL_NO_UI_CONSOLE | |
26 | # define OPENSSL_NO_UI | |
00deac3e | 27 | # endif |
48feaceb | 28 | # endif |
00deac3e | 29 | |
48feaceb | 30 | # ifdef __cplusplus |
a63d5eaa | 31 | extern "C" { |
48feaceb | 32 | # endif |
a63d5eaa | 33 | |
0f113f3e MC |
34 | /* |
35 | * All the following functions return -1 or NULL on error and in some cases | |
36 | * (UI_process()) -2 if interrupted or in some other way cancelled. When | |
37 | * everything is fine, they return 0, a positive value or a non-NULL pointer, | |
38 | * all depending on their purpose. | |
39 | */ | |
a63d5eaa RL |
40 | |
41 | /* Creators and destructor. */ | |
42 | UI *UI_new(void); | |
43 | UI *UI_new_method(const UI_METHOD *method); | |
44 | void UI_free(UI *ui); | |
45 | ||
1d97c843 TH |
46 | /*- |
47 | The following functions are used to add strings to be printed and prompt | |
2d2ed9df RL |
48 | strings to prompt for data. The names are UI_{add,dup}_<function>_string |
49 | and UI_{add,dup}_input_boolean. | |
50 | ||
51 | UI_{add,dup}_<function>_string have the following meanings: | |
0f113f3e MC |
52 | add add a text or prompt string. The pointers given to these |
53 | functions are used verbatim, no copying is done. | |
54 | dup make a copy of the text or prompt string, then add the copy | |
55 | to the collection of strings in the user interface. | |
56 | <function> | |
57 | The function is a name for the functionality that the given | |
58 | string shall be used for. It can be one of: | |
59 | input use the string as data prompt. | |
60 | verify use the string as verification prompt. This | |
61 | is used to verify a previous input. | |
62 | info use the string for informational output. | |
63 | error use the string for error output. | |
a63d5eaa RL |
64 | Honestly, there's currently no difference between info and error for the |
65 | moment. | |
66 | ||
2d2ed9df RL |
67 | UI_{add,dup}_input_boolean have the same semantics for "add" and "dup", |
68 | and are typically used when one wants to prompt for a yes/no response. | |
69 | ||
2d2ed9df RL |
70 | All of the functions in this group take a UI and a prompt string. |
71 | The string input and verify addition functions also take a flag argument, | |
72 | a buffer for the result to end up with, a minimum input size and a maximum | |
73 | input size (the result buffer MUST be large enough to be able to contain | |
74 | the maximum number of characters). Additionally, the verify addition | |
75 | functions takes another buffer to compare the result against. | |
76 | The boolean input functions take an action description string (which should | |
77 | be safe to ignore if the expected user action is obvious, for example with | |
78 | a dialog box with an OK button and a Cancel button), a string of acceptable | |
79 | characters to mean OK and to mean Cancel. The two last strings are checked | |
80 | to make sure they don't have common characters. Additionally, the same | |
81 | flag argument as for the string input is taken, as well as a result buffer. | |
82 | The result buffer is required to be at least one byte long. Depending on | |
83 | the answer, the first character from the OK or the Cancel character strings | |
84 | will be stored in the first byte of the result buffer. No NUL will be | |
85 | added, so the result is *not* a string. | |
a63d5eaa RL |
86 | |
87 | On success, the all return an index of the added information. That index | |
0d4fb843 | 88 | is useful when retrieving results with UI_get0_result(). */ |
9ad0f681 | 89 | int UI_add_input_string(UI *ui, const char *prompt, int flags, |
0f113f3e | 90 | char *result_buf, int minsize, int maxsize); |
9ad0f681 | 91 | int UI_dup_input_string(UI *ui, const char *prompt, int flags, |
0f113f3e | 92 | char *result_buf, int minsize, int maxsize); |
9ad0f681 | 93 | int UI_add_verify_string(UI *ui, const char *prompt, int flags, |
0f113f3e MC |
94 | char *result_buf, int minsize, int maxsize, |
95 | const char *test_buf); | |
9ad0f681 | 96 | int UI_dup_verify_string(UI *ui, const char *prompt, int flags, |
0f113f3e MC |
97 | char *result_buf, int minsize, int maxsize, |
98 | const char *test_buf); | |
2d2ed9df | 99 | int UI_add_input_boolean(UI *ui, const char *prompt, const char *action_desc, |
0f113f3e MC |
100 | const char *ok_chars, const char *cancel_chars, |
101 | int flags, char *result_buf); | |
2d2ed9df | 102 | int UI_dup_input_boolean(UI *ui, const char *prompt, const char *action_desc, |
0f113f3e MC |
103 | const char *ok_chars, const char *cancel_chars, |
104 | int flags, char *result_buf); | |
a63d5eaa RL |
105 | int UI_add_info_string(UI *ui, const char *text); |
106 | int UI_dup_info_string(UI *ui, const char *text); | |
107 | int UI_add_error_string(UI *ui, const char *text); | |
108 | int UI_dup_error_string(UI *ui, const char *text); | |
109 | ||
9ad0f681 RL |
110 | /* These are the possible flags. They can be or'ed together. */ |
111 | /* Use to have echoing of input */ | |
0f113f3e MC |
112 | # define UI_INPUT_FLAG_ECHO 0x01 |
113 | /* | |
114 | * Use a default password. Where that password is found is completely up to | |
115 | * the application, it might for example be in the user data set with | |
116 | * UI_add_user_data(). It is not recommended to have more than one input in | |
117 | * each UI being marked with this flag, or the application might get | |
118 | * confused. | |
119 | */ | |
48feaceb | 120 | # define UI_INPUT_FLAG_DEFAULT_PWD 0x02 |
9ad0f681 | 121 | |
c80fd6b2 MC |
122 | /*- |
123 | * The user of these routines may want to define flags of their own. The core | |
124 | * UI won't look at those, but will pass them on to the method routines. They | |
125 | * must use higher bits so they don't get confused with the UI bits above. | |
126 | * UI_INPUT_FLAG_USER_BASE tells which is the lowest bit to use. A good | |
127 | * example of use is this: | |
128 | * | |
0f113f3e | 129 | * #define MY_UI_FLAG1 (0x01 << UI_INPUT_FLAG_USER_BASE) |
c80fd6b2 | 130 | * |
9ad0f681 | 131 | */ |
48feaceb | 132 | # define UI_INPUT_FLAG_USER_BASE 16 |
9ad0f681 | 133 | |
c80fd6b2 MC |
134 | /*- |
135 | * The following function helps construct a prompt. object_desc is a | |
136 | * textual short description of the object, for example "pass phrase", | |
137 | * and object_name is the name of the object (might be a card name or | |
138 | * a file name. | |
139 | * The returned string shall always be allocated on the heap with | |
140 | * OPENSSL_malloc(), and need to be free'd with OPENSSL_free(). | |
141 | * | |
142 | * If the ui_method doesn't contain a pointer to a user-defined prompt | |
143 | * constructor, a default string is built, looking like this: | |
144 | * | |
145 | * "Enter {object_desc} for {object_name}:" | |
146 | * | |
147 | * So, if object_desc has the value "pass phrase" and object_name has | |
148 | * the value "foo.key", the resulting string is: | |
149 | * | |
150 | * "Enter pass phrase for foo.key:" | |
9ad0f681 RL |
151 | */ |
152 | char *UI_construct_prompt(UI *ui_method, | |
0f113f3e | 153 | const char *object_desc, const char *object_name); |
9ad0f681 | 154 | |
0f113f3e MC |
155 | /* |
156 | * The following function is used to store a pointer to user-specific data. | |
157 | * Any previous such pointer will be returned and replaced. | |
158 | * | |
159 | * For callback purposes, this function makes a lot more sense than using | |
160 | * ex_data, since the latter requires that different parts of OpenSSL or | |
161 | * applications share the same ex_data index. | |
162 | * | |
163 | * Note that the UI_OpenSSL() method completely ignores the user data. Other | |
164 | * methods may not, however. | |
165 | */ | |
1e7e62f8 | 166 | void *UI_add_user_data(UI *ui, void *user_data); |
545360c4 RL |
167 | /* |
168 | * Alternatively, this function is used to duplicate the user data. | |
169 | * This uses the duplicator method function. The destroy function will | |
170 | * be used to free the user data in this case. | |
171 | */ | |
172 | int UI_dup_user_data(UI *ui, void *user_data); | |
1e7e62f8 RL |
173 | /* We need a user data retrieving function as well. */ |
174 | void *UI_get0_user_data(UI *ui); | |
175 | ||
a63d5eaa RL |
176 | /* Return the result associated with a prompt given with the index i. */ |
177 | const char *UI_get0_result(UI *ui, int i); | |
178 | ||
179 | /* When all strings have been added, process the whole thing. */ | |
180 | int UI_process(UI *ui); | |
181 | ||
0f113f3e MC |
182 | /* |
183 | * Give a user interface parametrised control commands. This can be used to | |
184 | * send down an integer, a data pointer or a function pointer, as well as be | |
185 | * used to get information from a UI. | |
186 | */ | |
187 | int UI_ctrl(UI *ui, int cmd, long i, void *p, void (*f) (void)); | |
2d2ed9df RL |
188 | |
189 | /* The commands */ | |
0f113f3e MC |
190 | /* |
191 | * Use UI_CONTROL_PRINT_ERRORS with the value 1 to have UI_process print the | |
192 | * OpenSSL error stack before printing any info or added error messages and | |
193 | * before any prompting. | |
194 | */ | |
48feaceb | 195 | # define UI_CTRL_PRINT_ERRORS 1 |
0f113f3e MC |
196 | /* |
197 | * Check if a UI_process() is possible to do again with the same instance of | |
198 | * a user interface. This makes UI_ctrl() return 1 if it is redoable, and 0 | |
199 | * if not. | |
200 | */ | |
201 | # define UI_CTRL_IS_REDOABLE 2 | |
2d2ed9df | 202 | |
a63d5eaa | 203 | /* Some methods may use extra data */ |
0f113f3e MC |
204 | # define UI_set_app_data(s,arg) UI_set_ex_data(s,0,arg) |
205 | # define UI_get_app_data(s) UI_get_ex_data(s,0) | |
e6390aca | 206 | |
48feaceb | 207 | # define UI_get_ex_new_index(l, p, newf, dupf, freef) \ |
e6390aca | 208 | CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_UI, l, p, newf, dupf, freef) |
0f113f3e | 209 | int UI_set_ex_data(UI *r, int idx, void *arg); |
a63d5eaa RL |
210 | void *UI_get_ex_data(UI *r, int idx); |
211 | ||
212 | /* Use specific methods instead of the built-in one */ | |
213 | void UI_set_default_method(const UI_METHOD *meth); | |
214 | const UI_METHOD *UI_get_default_method(void); | |
215 | const UI_METHOD *UI_get_method(UI *ui); | |
216 | const UI_METHOD *UI_set_method(UI *ui, const UI_METHOD *meth); | |
217 | ||
48feaceb RL |
218 | # ifndef OPENSSL_NO_UI_CONSOLE |
219 | ||
a63d5eaa RL |
220 | /* The method with all the built-in thingies */ |
221 | UI_METHOD *UI_OpenSSL(void); | |
222 | ||
48feaceb RL |
223 | # endif |
224 | ||
57d0d048 | 225 | /* |
69687aa8 | 226 | * NULL method. Literally does nothing, but may serve as a placeholder |
57d0d048 RL |
227 | * to avoid internal default. |
228 | */ | |
229 | const UI_METHOD *UI_null(void); | |
230 | ||
a63d5eaa | 231 | /* ---------- For method writers ---------- */ |
1d97c843 TH |
232 | /*- |
233 | A method contains a number of functions that implement the low level | |
a63d5eaa RL |
234 | of the User Interface. The functions are: |
235 | ||
0f113f3e MC |
236 | an opener This function starts a session, maybe by opening |
237 | a channel to a tty, or by opening a window. | |
238 | a writer This function is called to write a given string, | |
239 | maybe to the tty, maybe as a field label in a | |
240 | window. | |
241 | a flusher This function is called to flush everything that | |
242 | has been output so far. It can be used to actually | |
243 | display a dialog box after it has been built. | |
244 | a reader This function is called to read a given prompt, | |
245 | maybe from the tty, maybe from a field in a | |
8483a003 | 246 | window. Note that it's called with all string |
0f113f3e MC |
247 | structures, not only the prompt ones, so it must |
248 | check such things itself. | |
249 | a closer This function closes the session, maybe by closing | |
250 | the channel to the tty, or closing the window. | |
a63d5eaa | 251 | |
9ad0f681 RL |
252 | All these functions are expected to return: |
253 | ||
0f113f3e MC |
254 | 0 on error. |
255 | 1 on success. | |
256 | -1 on out-of-band events, for example if some prompting has | |
257 | been canceled (by pressing Ctrl-C, for example). This is | |
258 | only checked when returned by the flusher or the reader. | |
9ad0f681 | 259 | |
a63d5eaa | 260 | The way this is used, the opener is first called, then the writer for all |
9ad0f681 RL |
261 | strings, then the flusher, then the reader for all strings and finally the |
262 | closer. Note that if you want to prompt from a terminal or other command | |
263 | line interface, the best is to have the reader also write the prompts | |
264 | instead of having the writer do it. If you want to prompt from a dialog | |
265 | box, the writer can be used to build up the contents of the box, and the | |
266 | flusher to actually display the box and run the event loop until all data | |
267 | has been given, after which the reader only grabs the given data and puts | |
268 | them back into the UI strings. | |
269 | ||
a63d5eaa | 270 | All method functions take a UI as argument. Additionally, the writer and |
9ad0f681 RL |
271 | the reader take a UI_STRING. |
272 | */ | |
a63d5eaa | 273 | |
0f113f3e MC |
274 | /* |
275 | * The UI_STRING type is the data structure that contains all the needed info | |
276 | * about a string or a prompt, including test data for a verification prompt. | |
277 | */ | |
a63d5eaa | 278 | typedef struct ui_string_st UI_STRING; |
85885715 | 279 | DEFINE_STACK_OF(UI_STRING) |
a63d5eaa | 280 | |
0f113f3e MC |
281 | /* |
282 | * The different types of strings that are currently supported. This is only | |
283 | * needed by method authors. | |
284 | */ | |
285 | enum UI_string_types { | |
286 | UIT_NONE = 0, | |
287 | UIT_PROMPT, /* Prompt for a string */ | |
288 | UIT_VERIFY, /* Prompt for a string and verify */ | |
289 | UIT_BOOLEAN, /* Prompt for a yes/no response */ | |
290 | UIT_INFO, /* Send info to the user */ | |
291 | UIT_ERROR /* Send an error message to the user */ | |
292 | }; | |
a63d5eaa RL |
293 | |
294 | /* Create and manipulate methods */ | |
472f727c | 295 | UI_METHOD *UI_create_method(const char *name); |
eb929eef | 296 | void UI_destroy_method(UI_METHOD *ui_method); |
0f113f3e MC |
297 | int UI_method_set_opener(UI_METHOD *method, int (*opener) (UI *ui)); |
298 | int UI_method_set_writer(UI_METHOD *method, | |
299 | int (*writer) (UI *ui, UI_STRING *uis)); | |
300 | int UI_method_set_flusher(UI_METHOD *method, int (*flusher) (UI *ui)); | |
301 | int UI_method_set_reader(UI_METHOD *method, | |
302 | int (*reader) (UI *ui, UI_STRING *uis)); | |
303 | int UI_method_set_closer(UI_METHOD *method, int (*closer) (UI *ui)); | |
545360c4 RL |
304 | int UI_method_set_data_duplicator(UI_METHOD *method, |
305 | void *(*duplicator) (UI *ui, void *ui_data), | |
306 | void (*destructor)(UI *ui, void *ui_data)); | |
0f113f3e MC |
307 | int UI_method_set_prompt_constructor(UI_METHOD *method, |
308 | char *(*prompt_constructor) (UI *ui, | |
309 | const char | |
310 | *object_desc, | |
311 | const char | |
312 | *object_name)); | |
18cfc668 | 313 | int UI_method_set_ex_data(UI_METHOD *method, int idx, void *data); |
a223ffe6 RL |
314 | int (*UI_method_get_opener(const UI_METHOD *method)) (UI *); |
315 | int (*UI_method_get_writer(const UI_METHOD *method)) (UI *, UI_STRING *); | |
316 | int (*UI_method_get_flusher(const UI_METHOD *method)) (UI *); | |
317 | int (*UI_method_get_reader(const UI_METHOD *method)) (UI *, UI_STRING *); | |
318 | int (*UI_method_get_closer(const UI_METHOD *method)) (UI *); | |
319 | char *(*UI_method_get_prompt_constructor(const UI_METHOD *method)) | |
320 | (UI *, const char *, const char *); | |
545360c4 RL |
321 | void *(*UI_method_get_data_duplicator(const UI_METHOD *method)) (UI *, void *); |
322 | void (*UI_method_get_data_destructor(const UI_METHOD *method)) (UI *, void *); | |
18cfc668 | 323 | const void *UI_method_get_ex_data(const UI_METHOD *method, int idx); |
0f113f3e MC |
324 | |
325 | /* | |
326 | * The following functions are helpers for method writers to access relevant | |
327 | * data from a UI_STRING. | |
328 | */ | |
a63d5eaa | 329 | |
9ad0f681 | 330 | /* Return type of the UI_STRING */ |
a63d5eaa | 331 | enum UI_string_types UI_get_string_type(UI_STRING *uis); |
9ad0f681 RL |
332 | /* Return input flags of the UI_STRING */ |
333 | int UI_get_input_flags(UI_STRING *uis); | |
a63d5eaa RL |
334 | /* Return the actual string to output (the prompt, info or error) */ |
335 | const char *UI_get0_output_string(UI_STRING *uis); | |
0f113f3e | 336 | /* |
8483a003 | 337 | * Return the optional action string to output (the boolean prompt |
0f113f3e MC |
338 | * instruction) |
339 | */ | |
2d2ed9df | 340 | const char *UI_get0_action_string(UI_STRING *uis); |
a63d5eaa RL |
341 | /* Return the result of a prompt */ |
342 | const char *UI_get0_result_string(UI_STRING *uis); | |
0f113f3e MC |
343 | /* |
344 | * Return the string to test the result against. Only useful with verifies. | |
345 | */ | |
a63d5eaa RL |
346 | const char *UI_get0_test_string(UI_STRING *uis); |
347 | /* Return the required minimum size of the result */ | |
348 | int UI_get_result_minsize(UI_STRING *uis); | |
349 | /* Return the required maximum size of the result */ | |
350 | int UI_get_result_maxsize(UI_STRING *uis); | |
351 | /* Set the result of a UI_STRING. */ | |
2d2ed9df | 352 | int UI_set_result(UI *ui, UI_STRING *uis, const char *result); |
a63d5eaa | 353 | |
44bdb056 | 354 | /* A couple of popular utility functions */ |
0f113f3e MC |
355 | int UI_UTIL_read_pw_string(char *buf, int length, const char *prompt, |
356 | int verify); | |
357 | int UI_UTIL_read_pw(char *buf, char *buff, int size, const char *prompt, | |
358 | int verify); | |
545360c4 | 359 | UI_METHOD *UI_UTIL_wrap_read_pem_callback(pem_password_cb *cb, int rwflag); |
44bdb056 | 360 | |
69588edb | 361 | int ERR_load_UI_strings(void); |
a63d5eaa | 362 | |
48feaceb | 363 | # ifdef __cplusplus |
a63d5eaa | 364 | } |
0cd0a820 | 365 | # endif |
a63d5eaa | 366 | #endif |