agent/agent.h

   1 /* agent.h - Global definitions for the agent
   2  *      Copyright (C) 2001, 2002, 2003, 2005 Free Software Foundation, Inc.
   3  *
   4  * This file is part of GnuPG.
   5  *
   6  * GnuPG is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * GnuPG is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #ifndef AGENT_H
  21 #define AGENT_H
  22
  23 #ifdef GPG_ERR_SOURCE_DEFAULT
  24 #error GPG_ERR_SOURCE_DEFAULT already defined
  25 #endif
  26 #define GPG_ERR_SOURCE_DEFAULT  GPG_ERR_SOURCE_GPGAGENT
  27 #include <gpg-error.h>
  28 #define map_assuan_err(a) \
  29         map_assuan_err_with_source (GPG_ERR_SOURCE_DEFAULT, (a))
  30 #include <errno.h>
  31
  32 #include <gcrypt.h>
  33 #include "../common/util.h"
  34 #include "../common/membuf.h"
  35 #include "../common/sysutils.h" /* (gnupg_fd_t) */
  36 #include "../common/session-env.h"
  37
  38 /* To convey some special hash algorithms we use algorithm numbers
  39    reserved for application use. */
  40 #ifndef GCRY_MODULE_ID_USER
  41 #define GCRY_MODULE_ID_USER 1024
  42 #endif
  43 #define MD_USER_TLS_MD5SHA1 (GCRY_MODULE_ID_USER+1)
  44
  45 /* Maximum length of a digest.  */
  46 #define MAX_DIGEST_LEN 64
  47
  48 /* A large struct name "opt" to keep global flags */
  49 struct
  50 {
  51   unsigned int debug;  /* Debug flags (DBG_foo_VALUE) */
  52   int verbose;         /* Verbosity level */
  53   int quiet;           /* Be as quiet as possible */
  54   int dry_run;         /* Don't change any persistent data */
  55   int batch;           /* Batch mode */
  56   const char *homedir; /* Configuration directory name */
  57
  58   /* Environment setting gathered at program start or changed using the
  59      Assuan command UPDATESTARTUPTTY. */
  60   session_env_t startup_env;
  61   char *startup_lc_ctype;
  62   char *startup_lc_messages;
  63
  64
  65   const char *pinentry_program; /* Filename of the program to start as
  66                                    pinentry.  */
  67   const char *scdaemon_program; /* Filename of the program to handle
  68                                    smartcard tasks.  */
  69   int disable_scdaemon;         /* Never use the SCdaemon. */
  70   int no_grab;         /* Don't let the pinentry grab the keyboard */
  71
  72   /* The name of the file pinentry shall tocuh before exiting.  If
  73      this is not set the filoe name of the standard socket is used. */
  74   const char *pinentry_touch_file;
  75
  76   /* The default and maximum TTL of cache entries. */
  77   unsigned long def_cache_ttl;     /* Default. */
  78   unsigned long def_cache_ttl_ssh; /* for SSH. */
  79   unsigned long max_cache_ttl;     /* Default. */
  80   unsigned long max_cache_ttl_ssh; /* for SSH. */
  81
  82   /* Flag disallowing bypassing of the warning.  */
  83   int enforce_passphrase_constraints;
  84   /* The require minmum length of a passphrase. */
  85   unsigned int min_passphrase_len;
  86   /* The minimum number of non-alpha characters in a passphrase.  */
  87   unsigned int min_passphrase_nonalpha;
  88   /* File name with a patternfile or NULL if not enabled.  */
  89   const char *check_passphrase_pattern;
  90   /* If not 0 the user is asked to change his passphrase after these
  91      number of days.  */
  92   unsigned int max_passphrase_days;
  93   /* If set, a passphrase history will be written and checked at each
  94      passphrase change.  */
  95   int enable_passhrase_history;
  96
  97   int running_detached; /* We are running detached from the tty. */
  98
  99   int ignore_cache_for_signing;
 100   int allow_mark_trusted;
 101   int allow_preset_passphrase;
 102   int keep_tty;      /* Don't switch the TTY (for pinentry) on request */
 103   int keep_display;  /* Don't switch the DISPLAY (for pinentry) on request */
 104   int ssh_support;   /* Enable ssh-agent emulation.  */
 105 } opt;
 106
 107
 108 #define DBG_COMMAND_VALUE 1     /* debug commands i/o */
 109 #define DBG_MPI_VALUE     2     /* debug mpi details */
 110 #define DBG_CRYPTO_VALUE  4     /* debug low level crypto */
 111 #define DBG_MEMORY_VALUE  32    /* debug memory allocation stuff */
 112 #define DBG_CACHE_VALUE   64    /* debug the caching */
 113 #define DBG_MEMSTAT_VALUE 128   /* show memory statistics */
 114 #define DBG_HASHING_VALUE 512   /* debug hashing operations */
 115 #define DBG_ASSUAN_VALUE 1024
 116
 117 #define DBG_COMMAND (opt.debug & DBG_COMMAND_VALUE)
 118 #define DBG_CRYPTO  (opt.debug & DBG_CRYPTO_VALUE)
 119 #define DBG_MEMORY  (opt.debug & DBG_MEMORY_VALUE)
 120 #define DBG_CACHE   (opt.debug & DBG_CACHE_VALUE)
 121 #define DBG_HASHING (opt.debug & DBG_HASHING_VALUE)
 122 #define DBG_ASSUAN  (opt.debug & DBG_ASSUAN_VALUE)
 123
 124 struct server_local_s;
 125 struct scd_local_s;
 126
 127 /* Collection of data per session (aka connection). */
 128 struct server_control_s
 129 {
 130   /* Private data used to fire up the connection thread.  We use this
 131      structure do avoid an extra allocation for just a few bytes. */
 132   struct {
 133     gnupg_fd_t fd;
 134   } thread_startup;
 135
 136   /* Private data of the server (command.c). */
 137   struct server_local_s *server_local;
 138
 139   /* Private data of the SCdaemon (call-scd.c). */
 140   struct scd_local_s *scd_local;
 141
 142   session_env_t session_env;
 143   char *lc_ctype;
 144   char *lc_messages;
 145
 146   struct {
 147     int algo;
 148     unsigned char value[MAX_DIGEST_LEN];
 149     int valuelen;
 150     int raw_value: 1;
 151   } digest;
 152   unsigned char keygrip[20];
 153   int have_keygrip;
 154
 155   int use_auth_call; /* Hack to send the PKAUTH command instead of the
 156                         PKSIGN command to the scdaemon.  */
 157   int in_passwd;     /* Hack to inhibit enforced passphrase change
 158                         during an explicit passwd command.  */
 159 };
 160
 161
 162 struct pin_entry_info_s
 163 {
 164   int min_digits; /* min. number of digits required or 0 for freeform entry */
 165   int max_digits; /* max. number of allowed digits allowed*/
 166   int max_tries;
 167   int failed_tries;
 168   int with_qualitybar; /* Set if the quality bar should be displayed.  */
 169   int (*check_cb)(struct pin_entry_info_s *); /* CB used to check the PIN */
 170   void *check_cb_arg;  /* optional argument which might be of use in the CB */
 171   const char *cb_errtext; /* used by the cb to displaye a specific error */
 172   size_t max_length; /* allocated length of the buffer */
 173   char pin[1];
 174 };
 175
 176
 177 enum
 178   {
 179     PRIVATE_KEY_UNKNOWN = 0,
 180     PRIVATE_KEY_CLEAR = 1,
 181     PRIVATE_KEY_PROTECTED = 2,
 182     PRIVATE_KEY_SHADOWED = 3
 183   };
 184
 185
 186 /* Values for the cache_mode arguments. */
 187 typedef enum
 188   {
 189     CACHE_MODE_IGNORE = 0, /* Special mode to bypass the cache. */
 190     CACHE_MODE_ANY,        /* Any mode except ignore matches. */
 191     CACHE_MODE_NORMAL,     /* Normal cache (gpg-agent). */
 192     CACHE_MODE_USER,       /* GET_PASSPHRASE related cache. */
 193     CACHE_MODE_SSH         /* SSH related cache. */
 194   }
 195 cache_mode_t;
 196
 197
 198 /* The type of a function to lookup a TTL by a keygrip.  */
 199 typedef int (*lookup_ttl_t)(const char *hexgrip);
 200
 201
 202 /*-- gpg-agent.c --*/
 203 void agent_exit (int rc) JNLIB_GCC_A_NR; /* Also implemented in other tools */
 204 const char *get_agent_socket_name (void);
 205 const char *get_agent_ssh_socket_name (void);
 206 #ifdef HAVE_W32_SYSTEM
 207 void *get_agent_scd_notify_event (void);
 208 #endif
 209 void agent_sighup_action (void);
 210
 211 /*-- command.c --*/
 212 gpg_error_t agent_inq_pinentry_launched (ctrl_t ctrl, unsigned long pid);
 213 gpg_error_t agent_write_status (ctrl_t ctrl, const char *keyword, ...)
 214      GNUPG_GCC_A_SENTINEL(0);
 215 void bump_key_eventcounter (void);
 216 void bump_card_eventcounter (void);
 217 void start_command_handler (ctrl_t, gnupg_fd_t, gnupg_fd_t);
 218
 219 /*-- command-ssh.c --*/
 220 void start_command_handler_ssh (ctrl_t, gnupg_fd_t);
 221
 222 /*-- findkey.c --*/
 223 int agent_write_private_key (const unsigned char *grip,
 224                              const void *buffer, size_t length, int force);
 225 gpg_error_t agent_key_from_file (ctrl_t ctrl,
 226                                  const char *desc_text,
 227                                  const unsigned char *grip,
 228                                  unsigned char **shadow_info,
 229                                  cache_mode_t cache_mode,
 230                                  lookup_ttl_t lookup_ttl,
 231                                  gcry_sexp_t *result);
 232 gpg_error_t agent_public_key_from_file (ctrl_t ctrl,
 233                                         const unsigned char *grip,
 234                                         gcry_sexp_t *result);
 235 int agent_key_available (const unsigned char *grip);
 236 gpg_error_t agent_key_info_from_file (ctrl_t ctrl, const unsigned char *grip,
 237                                       int *r_keytype,
 238                                       unsigned char **r_shadow_info);
 239
 240 /*-- call-pinentry.c --*/
 241 void initialize_module_call_pinentry (void);
 242 void agent_query_dump_state (void);
 243 void agent_reset_query (ctrl_t ctrl);
 244 int pinentry_active_p (ctrl_t ctrl, int waitseconds);
 245 int agent_askpin (ctrl_t ctrl,
 246                   const char *desc_text, const char *prompt_text,
 247                   const char *inital_errtext,
 248                   struct pin_entry_info_s *pininfo);
 249 int agent_get_passphrase (ctrl_t ctrl, char **retpass,
 250                           const char *desc, const char *prompt,
 251                           const char *errtext, int with_qualitybar);
 252 int agent_get_confirmation (ctrl_t ctrl, const char *desc, const char *ok,
 253                             const char *notokay, int with_cancel);
 254 int agent_show_message (ctrl_t ctrl, const char *desc, const char *ok_btn);
 255 int agent_popup_message_start (ctrl_t ctrl,
 256                                const char *desc, const char *ok_btn);
 257 void agent_popup_message_stop (ctrl_t ctrl);
 258
 259
 260 /*-- cache.c --*/
 261 void agent_flush_cache (void);
 262 int agent_put_cache (const char *key, cache_mode_t cache_mode,
 263                      const char *data, int ttl);
 264 const char *agent_get_cache (const char *key, cache_mode_t cache_mode,
 265                              void **cache_id);
 266 void agent_unlock_cache_entry (void **cache_id);
 267
 268
 269 /*-- pksign.c --*/
 270 int agent_pksign_do (ctrl_t ctrl, const char *desc_text,
 271                      gcry_sexp_t *signature_sexp,
 272                      cache_mode_t cache_mode, lookup_ttl_t lookup_ttl);
 273 int agent_pksign (ctrl_t ctrl, const char *desc_text,
 274                   membuf_t *outbuf, cache_mode_t cache_mode);
 275
 276 /*-- pkdecrypt.c --*/
 277 int agent_pkdecrypt (ctrl_t ctrl, const char *desc_text,
 278                      const unsigned char *ciphertext, size_t ciphertextlen,
 279                      membuf_t *outbuf);
 280
 281 /*-- genkey.c --*/
 282 int check_passphrase_constraints (ctrl_t ctrl, const char *pw, int silent);
 283 int agent_genkey (ctrl_t ctrl,
 284                   const char *keyparam, size_t keyparmlen, membuf_t *outbuf);
 285 int agent_protect_and_store (ctrl_t ctrl, gcry_sexp_t s_skey);
 286
 287 /*-- protect.c --*/
 288 int agent_protect (const unsigned char *plainkey, const char *passphrase,
 289                    unsigned char **result, size_t *resultlen);
 290 int agent_unprotect (const unsigned char *protectedkey, const char *passphrase,
 291                      gnupg_isotime_t protected_at,
 292                      unsigned char **result, size_t *resultlen);
 293 int agent_private_key_type (const unsigned char *privatekey);
 294 unsigned char *make_shadow_info (const char *serialno, const char *idstring);
 295 int agent_shadow_key (const unsigned char *pubkey,
 296                       const unsigned char *shadow_info,
 297                       unsigned char **result);
 298 int agent_get_shadow_info (const unsigned char *shadowkey,
 299                            unsigned char const **shadow_info);
 300 gpg_error_t parse_shadow_info (const unsigned char *shadow_info,
 301                                char **r_hexsn, char **r_idstr);
 302
 303
 304 /*-- trustlist.c --*/
 305 void initialize_module_trustlist (void);
 306 gpg_error_t agent_istrusted (ctrl_t ctrl, const char *fpr, int *r_disabled);
 307 gpg_error_t agent_listtrusted (void *assuan_context);
 308 gpg_error_t agent_marktrusted (ctrl_t ctrl, const char *name,
 309                                const char *fpr, int flag);
 310 void agent_reload_trustlist (void);
 311
 312
 313 /*-- divert-scd.c --*/
 314 int divert_pksign (ctrl_t ctrl,
 315                    const unsigned char *digest, size_t digestlen, int algo,
 316                    const unsigned char *shadow_info, unsigned char **r_sig);
 317 int divert_pkdecrypt (ctrl_t ctrl,
 318                       const unsigned char *cipher,
 319                       const unsigned char *shadow_info,
 320                       char **r_buf, size_t *r_len);
 321 int divert_generic_cmd (ctrl_t ctrl,
 322                         const char *cmdline, void *assuan_context);
 323
 324
 325 /*-- call-scd.c --*/
 326 void initialize_module_call_scd (void);
 327 void agent_scd_dump_state (void);
 328 int agent_scd_check_running (void);
 329 void agent_scd_check_aliveness (void);
 330 int agent_reset_scd (ctrl_t ctrl);
 331 int agent_card_learn (ctrl_t ctrl,
 332                       void (*kpinfo_cb)(void*, const char *),
 333                       void *kpinfo_cb_arg,
 334                       void (*certinfo_cb)(void*, const char *),
 335                       void *certinfo_cb_arg,
 336                       void (*sinfo_cb)(void*, const char *,
 337                                        size_t, const char *),
 338                       void *sinfo_cb_arg);
 339 int agent_card_serialno (ctrl_t ctrl, char **r_serialno);
 340 int agent_card_pksign (ctrl_t ctrl,
 341                        const char *keyid,
 342                        int (*getpin_cb)(void *, const char *, char*, size_t),
 343                        void *getpin_cb_arg,
 344                        const unsigned char *indata, size_t indatalen,
 345                        unsigned char **r_buf, size_t *r_buflen);
 346 int agent_card_pkdecrypt (ctrl_t ctrl,
 347                           const char *keyid,
 348                           int (*getpin_cb)(void *, const char *, char*,size_t),
 349                           void *getpin_cb_arg,
 350                           const unsigned char *indata, size_t indatalen,
 351                           char **r_buf, size_t *r_buflen);
 352 int agent_card_readcert (ctrl_t ctrl,
 353                          const char *id, char **r_buf, size_t *r_buflen);
 354 int agent_card_readkey (ctrl_t ctrl, const char *id, unsigned char **r_buf);
 355 gpg_error_t agent_card_getattr (ctrl_t ctrl, const char *name, char **result);
 356 int agent_card_scd (ctrl_t ctrl, const char *cmdline,
 357                     int (*getpin_cb)(void *, const char *, char*, size_t),
 358                     void *getpin_cb_arg, void *assuan_context);
 359
 360
 361 /*-- learncard.c --*/
 362 int agent_handle_learn (ctrl_t ctrl, void *assuan_context);
 363
 364
 365 #endif /*AGENT_H*/