1 /* crypto/ui/ui.h -*- mode:C; c-file-style: "eay" -*- */
   2 /* Written by Richard Levitte (richard@levitte.org) for the OpenSSL
   3  * project 2001.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2001 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer. 
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    openssl-core@openssl.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58 
  59 #ifndef HEADER_UI_H
  60 #define HEADER_UI_H
  61 
  62 #ifndef OPENSSL_NO_DEPRECATED
  63 #include <openssl/crypto.h>
  64 #endif
  65 #include <openssl/safestack.h>
  66 #include <openssl/ossl_typ.h>
  67 
  68 #ifdef  __cplusplus
  69 extern "C" {
  70 #endif
  71 
  72 /* Declared already in ossl_typ.h */
  73 /* typedef struct ui_st UI; */
  74 /* typedef struct ui_method_st UI_METHOD; */
  75 
  76 
  77 /* All the following functions return -1 or NULL on error and in some cases
  78    (UI_process()) -2 if interrupted or in some other way cancelled.
  79    When everything is fine, they return 0, a positive value or a non-NULL
  80    pointer, all depending on their purpose. */
  81 
  82 /* Creators and destructor.   */
  83 UI *UI_new(void);
  84 UI *UI_new_method(const UI_METHOD *method);
  85 void UI_free(UI *ui);
  86 
  87 /* The following functions are used to add strings to be printed and prompt
  88    strings to prompt for data.  The names are UI_{add,dup}_<function>_string
  89    and UI_{add,dup}_input_boolean.
  90 
  91    UI_{add,dup}_<function>_string have the following meanings:
  92         add     add a text or prompt string.  The pointers given to these
  93                 functions are used verbatim, no copying is done.
  94         dup     make a copy of the text or prompt string, then add the copy
  95                 to the collection of strings in the user interface.
  96         <function>
  97                 The function is a name for the functionality that the given
  98                 string shall be used for.  It can be one of:
  99                         input   use the string as data prompt.
 100                         verify  use the string as verification prompt.  This
 101                                 is used to verify a previous input.
 102                         info    use the string for informational output.
 103                         error   use the string for error output.
 104    Honestly, there's currently no difference between info and error for the
 105    moment.
 106 
 107    UI_{add,dup}_input_boolean have the same semantics for "add" and "dup",
 108    and are typically used when one wants to prompt for a yes/no response.
 109 
 110 
 111    All of the functions in this group take a UI and a prompt string.
 112    The string input and verify addition functions also take a flag argument,
 113    a buffer for the result to end up with, a minimum input size and a maximum
 114    input size (the result buffer MUST be large enough to be able to contain
 115    the maximum number of characters).  Additionally, the verify addition
 116    functions takes another buffer to compare the result against.
 117    The boolean input functions take an action description string (which should
 118    be safe to ignore if the expected user action is obvious, for example with
 119    a dialog box with an OK button and a Cancel button), a string of acceptable
 120    characters to mean OK and to mean Cancel.  The two last strings are checked
 121    to make sure they don't have common characters.  Additionally, the same
 122    flag argument as for the string input is taken, as well as a result buffer.
 123    The result buffer is required to be at least one byte long.  Depending on
 124    the answer, the first character from the OK or the Cancel character strings
 125    will be stored in the first byte of the result buffer.  No NUL will be
 126    added, so the result is *not* a string.
 127 
 128    On success, the all return an index of the added information.  That index
 129    is usefull when retrieving results with UI_get0_result(). */
 130 int UI_add_input_string(UI *ui, const char *prompt, int flags,
 131         char *result_buf, int minsize, int maxsize);
 132 int UI_dup_input_string(UI *ui, const char *prompt, int flags,
 133         char *result_buf, int minsize, int maxsize);
 134 int UI_add_verify_string(UI *ui, const char *prompt, int flags,
 135         char *result_buf, int minsize, int maxsize, const char *test_buf);
 136 int UI_dup_verify_string(UI *ui, const char *prompt, int flags,
 137         char *result_buf, int minsize, int maxsize, const char *test_buf);
 138 int UI_add_input_boolean(UI *ui, const char *prompt, const char *action_desc,
 139         const char *ok_chars, const char *cancel_chars,
 140         int flags, char *result_buf);
 141 int UI_dup_input_boolean(UI *ui, const char *prompt, const char *action_desc,
 142         const char *ok_chars, const char *cancel_chars,
 143         int flags, char *result_buf);
 144 int UI_add_info_string(UI *ui, const char *text);
 145 int UI_dup_info_string(UI *ui, const char *text);
 146 int UI_add_error_string(UI *ui, const char *text);
 147 int UI_dup_error_string(UI *ui, const char *text);
 148 
 149 /* These are the possible flags.  They can be or'ed together. */
 150 /* Use to have echoing of input */
 151 #define UI_INPUT_FLAG_ECHO              0x01
 152 /* Use a default password.  Where that password is found is completely
 153    up to the application, it might for example be in the user data set
 154    with UI_add_user_data().  It is not recommended to have more than
 155    one input in each UI being marked with this flag, or the application
 156    might get confused. */
 157 #define UI_INPUT_FLAG_DEFAULT_PWD       0x02
 158 
 159 /* The user of these routines may want to define flags of their own.  The core
 160    UI won't look at those, but will pass them on to the method routines.  They
 161    must use higher bits so they don't get confused with the UI bits above.
 162    UI_INPUT_FLAG_USER_BASE tells which is the lowest bit to use.  A good
 163    example of use is this:
 164 
 165         #define MY_UI_FLAG1     (0x01 << UI_INPUT_FLAG_USER_BASE)
 166 
 167 */
 168 #define UI_INPUT_FLAG_USER_BASE 16
 169 
 170 
 171 /* The following function helps construct a prompt.  object_desc is a
 172    textual short description of the object, for example "pass phrase",
 173    and object_name is the name of the object (might be a card name or
 174    a file name.
 175    The returned string shall always be allocated on the heap with
 176    OPENSSL_malloc(), and need to be free'd with OPENSSL_free().
 177 
 178    If the ui_method doesn't contain a pointer to a user-defined prompt
 179    constructor, a default string is built, looking like this:
 180 
 181         "Enter {object_desc} for {object_name}:"
 182 
 183    So, if object_desc has the value "pass phrase" and object_name has
 184    the value "foo.key", the resulting string is:
 185 
 186         "Enter pass phrase for foo.key:"
 187 */
 188 char *UI_construct_prompt(UI *ui_method,
 189         const char *object_desc, const char *object_name);
 190 
 191 
 192 /* The following function is used to store a pointer to user-specific data.
 193    Any previous such pointer will be returned and replaced.
 194 
 195    For callback purposes, this function makes a lot more sense than using
 196    ex_data, since the latter requires that different parts of OpenSSL or
 197    applications share the same ex_data index.
 198 
 199    Note that the UI_OpenSSL() method completely ignores the user data.
 200    Other methods may not, however.  */
 201 void *UI_add_user_data(UI *ui, void *user_data);
 202 /* We need a user data retrieving function as well.  */
 203 void *UI_get0_user_data(UI *ui);
 204 
 205 /* Return the result associated with a prompt given with the index i. */
 206 const char *UI_get0_result(UI *ui, int i);
 207 
 208 /* When all strings have been added, process the whole thing. */
 209 int UI_process(UI *ui);
 210 
 211 /* Give a user interface parametrised control commands.  This can be used to
 212    send down an integer, a data pointer or a function pointer, as well as
 213    be used to get information from a UI. */
 214 int UI_ctrl(UI *ui, int cmd, long i, void *p, void (*f)(void));
 215 
 216 /* The commands */
 217 /* Use UI_CONTROL_PRINT_ERRORS with the value 1 to have UI_process print the
 218    OpenSSL error stack before printing any info or added error messages and
 219    before any prompting. */
 220 #define UI_CTRL_PRINT_ERRORS            1
 221 /* Check if a UI_process() is possible to do again with the same instance of
 222    a user interface.  This makes UI_ctrl() return 1 if it is redoable, and 0
 223    if not. */
 224 #define UI_CTRL_IS_REDOABLE             2
 225 
 226 
 227 /* Some methods may use extra data */
 228 #define UI_set_app_data(s,arg)         UI_set_ex_data(s,0,arg)
 229 #define UI_get_app_data(s)             UI_get_ex_data(s,0)
 230 int UI_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
 231         CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func);
 232 int UI_set_ex_data(UI *r,int idx,void *arg);
 233 void *UI_get_ex_data(UI *r, int idx);
 234 
 235 /* Use specific methods instead of the built-in one */
 236 void UI_set_default_method(const UI_METHOD *meth);
 237 const UI_METHOD *UI_get_default_method(void);
 238 const UI_METHOD *UI_get_method(UI *ui);
 239 const UI_METHOD *UI_set_method(UI *ui, const UI_METHOD *meth);
 240 
 241 /* The method with all the built-in thingies */
 242 UI_METHOD *UI_OpenSSL(void);
 243 
 244 
 245 /* ---------- For method writers ---------- */
 246 /* A method contains a number of functions that implement the low level
 247    of the User Interface.  The functions are:
 248 
 249         an opener       This function starts a session, maybe by opening
 250                         a channel to a tty, or by opening a window.
 251         a writer        This function is called to write a given string,
 252                         maybe to the tty, maybe as a field label in a
 253                         window.
 254         a flusher       This function is called to flush everything that
 255                         has been output so far.  It can be used to actually
 256                         display a dialog box after it has been built.
 257         a reader        This function is called to read a given prompt,
 258                         maybe from the tty, maybe from a field in a
 259                         window.  Note that it's called wth all string
 260                         structures, not only the prompt ones, so it must
 261                         check such things itself.
 262         a closer        This function closes the session, maybe by closing
 263                         the channel to the tty, or closing the window.
 264 
 265    All these functions are expected to return:
 266 
 267         0       on error.
 268         1       on success.
 269         -1      on out-of-band events, for example if some prompting has
 270                 been canceled (by pressing Ctrl-C, for example).  This is
 271                 only checked when returned by the flusher or the reader.
 272 
 273    The way this is used, the opener is first called, then the writer for all
 274    strings, then the flusher, then the reader for all strings and finally the
 275    closer.  Note that if you want to prompt from a terminal or other command
 276    line interface, the best is to have the reader also write the prompts
 277    instead of having the writer do it.  If you want to prompt from a dialog
 278    box, the writer can be used to build up the contents of the box, and the
 279    flusher to actually display the box and run the event loop until all data
 280    has been given, after which the reader only grabs the given data and puts
 281    them back into the UI strings.
 282 
 283    All method functions take a UI as argument.  Additionally, the writer and
 284    the reader take a UI_STRING.
 285 */
 286 
 287 /* The UI_STRING type is the data structure that contains all the needed info
 288    about a string or a prompt, including test data for a verification prompt.
 289 */
 290 typedef struct ui_string_st UI_STRING;
 291 DECLARE_STACK_OF(UI_STRING)
 292 
 293 /* The different types of strings that are currently supported.
 294    This is only needed by method authors. */
 295 enum UI_string_types
 296         {
 297         UIT_NONE=0,
 298         UIT_PROMPT,             /* Prompt for a string */
 299         UIT_VERIFY,             /* Prompt for a string and verify */
 300         UIT_BOOLEAN,            /* Prompt for a yes/no response */
 301         UIT_INFO,               /* Send info to the user */
 302         UIT_ERROR               /* Send an error message to the user */
 303         };
 304 
 305 /* Create and manipulate methods */
 306 UI_METHOD *UI_create_method(char *name);
 307 void UI_destroy_method(UI_METHOD *ui_method);
 308 int UI_method_set_opener(UI_METHOD *method, int (*opener)(UI *ui));
 309 int UI_method_set_writer(UI_METHOD *method, int (*writer)(UI *ui, UI_STRING *uis));
 310 int UI_method_set_flusher(UI_METHOD *method, int (*flusher)(UI *ui));
 311 int UI_method_set_reader(UI_METHOD *method, int (*reader)(UI *ui, UI_STRING *uis));
 312 int UI_method_set_closer(UI_METHOD *method, int (*closer)(UI *ui));
 313 int UI_method_set_prompt_constructor(UI_METHOD *method, char *(*prompt_constructor)(UI* ui, const char* object_desc, const char* object_name));
 314 int (*UI_method_get_opener(UI_METHOD *method))(UI*);
 315 int (*UI_method_get_writer(UI_METHOD *method))(UI*,UI_STRING*);
 316 int (*UI_method_get_flusher(UI_METHOD *method))(UI*);
 317 int (*UI_method_get_reader(UI_METHOD *method))(UI*,UI_STRING*);
 318 int (*UI_method_get_closer(UI_METHOD *method))(UI*);
 319 char * (*UI_method_get_prompt_constructor(UI_METHOD *method))(UI*, const char*, const char*);
 320 
 321 /* The following functions are helpers for method writers to access relevant
 322    data from a UI_STRING. */
 323 
 324 /* Return type of the UI_STRING */
 325 enum UI_string_types UI_get_string_type(UI_STRING *uis);
 326 /* Return input flags of the UI_STRING */
 327 int UI_get_input_flags(UI_STRING *uis);
 328 /* Return the actual string to output (the prompt, info or error) */
 329 const char *UI_get0_output_string(UI_STRING *uis);
 330 /* Return the optional action string to output (the boolean promtp instruction) */
 331 const char *UI_get0_action_string(UI_STRING *uis);
 332 /* Return the result of a prompt */
 333 const char *UI_get0_result_string(UI_STRING *uis);
 334 /* Return the string to test the result against.  Only useful with verifies. */
 335 const char *UI_get0_test_string(UI_STRING *uis);
 336 /* Return the required minimum size of the result */
 337 int UI_get_result_minsize(UI_STRING *uis);
 338 /* Return the required maximum size of the result */
 339 int UI_get_result_maxsize(UI_STRING *uis);
 340 /* Set the result of a UI_STRING. */
 341 int UI_set_result(UI *ui, UI_STRING *uis, const char *result);
 342 
 343 
 344 /* A couple of popular utility functions */
 345 int UI_UTIL_read_pw_string(char *buf,int length,const char *prompt,int verify);
 346 int UI_UTIL_read_pw(char *buf,char *buff,int size,const char *prompt,int verify);
 347 
 348 
 349 /* BEGIN ERROR CODES */
 350 /* The following lines are auto generated by the script mkerr.pl. Any changes
 351  * made after this point may be overwritten when the script is next run.
 352  */
 353 void ERR_load_UI_strings(void);
 354 
 355 /* Error codes for the UI functions. */
 356 
 357 /* Function codes. */
 358 #define UI_F_GENERAL_ALLOCATE_BOOLEAN                    108
 359 #define UI_F_GENERAL_ALLOCATE_PROMPT                     109
 360 #define UI_F_GENERAL_ALLOCATE_STRING                     100
 361 #define UI_F_UI_CTRL                                     111
 362 #define UI_F_UI_DUP_ERROR_STRING                         101
 363 #define UI_F_UI_DUP_INFO_STRING                          102
 364 #define UI_F_UI_DUP_INPUT_BOOLEAN                        110
 365 #define UI_F_UI_DUP_INPUT_STRING                         103
 366 #define UI_F_UI_DUP_VERIFY_STRING                        106
 367 #define UI_F_UI_GET0_RESULT                              107
 368 #define UI_F_UI_NEW_METHOD                               104
 369 #define UI_F_UI_SET_RESULT                               105
 370 
 371 /* Reason codes. */
 372 #define UI_R_COMMON_OK_AND_CANCEL_CHARACTERS             104
 373 #define UI_R_INDEX_TOO_LARGE                             102
 374 #define UI_R_INDEX_TOO_SMALL                             103
 375 #define UI_R_NO_RESULT_BUFFER                            105
 376 #define UI_R_RESULT_TOO_LARGE                            100
 377 #define UI_R_RESULT_TOO_SMALL                            101
 378 #define UI_R_UNKNOWN_CONTROL_COMMAND                     106
 379 
 380 #ifdef  __cplusplus
 381 }
 382 #endif
 383 #endif