g10/packet.h

   1 /* packet.h - OpenPGP packet definitions
   2  * Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
   3  *               2007 Free Software Foundation, Inc.
   4  *
   5  * This file is part of GnuPG.
   6  *
   7  * GnuPG is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 3 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * GnuPG is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #ifndef G10_PACKET_H
  22 #define G10_PACKET_H
  23
  24 #include "types.h"
  25 #include "../common/iobuf.h"
  26 #include "../jnlib/strlist.h"
  27 #include "cipher.h"
  28 #include "filter.h"
  29 #include "../common/openpgpdefs.h"
  30
  31 #define DEBUG_PARSE_PACKET 1
  32
  33
  34 typedef struct packet_struct PACKET;
  35
  36 /* PKT_GPG_CONTROL types */
  37 typedef enum {
  38     CTRLPKT_CLEARSIGN_START = 1,
  39     CTRLPKT_PIPEMODE = 2,
  40     CTRLPKT_PLAINTEXT_MARK =3
  41 } ctrlpkttype_t;
  42
  43 typedef enum {
  44     PREFTYPE_NONE = 0,
  45     PREFTYPE_SYM = 1,
  46     PREFTYPE_HASH = 2,
  47     PREFTYPE_ZIP = 3
  48 } preftype_t;
  49
  50 typedef struct {
  51     byte type;
  52     byte value;
  53 } prefitem_t;
  54
  55 typedef struct {
  56     int  mode;
  57     byte hash_algo;
  58     byte salt[8];
  59     u32  count;
  60 } STRING2KEY;
  61
  62 typedef struct {
  63     byte version;
  64     byte cipher_algo;    /* cipher algorithm used */
  65     STRING2KEY s2k;
  66     byte seskeylen;   /* keylength in byte or 0 for no seskey */
  67     byte seskey[1];
  68 } PKT_symkey_enc;
  69
  70 typedef struct {
  71     u32     keyid[2];       /* 64 bit keyid */
  72     byte    version;
  73     byte    pubkey_algo;    /* algorithm used for public key scheme */
  74     byte    throw_keyid;
  75     gcry_mpi_t     data[PUBKEY_MAX_NENC];
  76 } PKT_pubkey_enc;
  77
  78
  79 typedef struct {
  80     u32     keyid[2];       /* 64 bit keyid */
  81     byte    sig_class;      /* sig classification */
  82     byte    digest_algo;    /* algorithm used for digest */
  83     byte    pubkey_algo;    /* algorithm used for public key scheme */
  84     byte    last;           /* a stupid flag */
  85 } PKT_onepass_sig;
  86
  87
  88 typedef struct {
  89     size_t size;  /* allocated */
  90     size_t len;   /* used */
  91     byte data[1];
  92 } subpktarea_t;
  93
  94 struct revocation_key {
  95   byte class;
  96   byte algid;
  97   byte fpr[MAX_FINGERPRINT_LEN];
  98 };
  99
 100
 101 /* Object to keep information about a PKA DNS record. */
 102 typedef struct
 103 {
 104   int valid;    /* An actual PKA record exists for EMAIL. */
 105   int checked;  /* Set to true if the FPR has been checked against the
 106                    actual key. */
 107   char *uri;    /* Malloced string with the URI. NULL if the URI is
 108                    not available.*/
 109   unsigned char fpr[20]; /* The fingerprint as stored in the PKA RR. */
 110   char email[1];/* The email address from the notation data. */
 111 } pka_info_t;
 112
 113
 114 /* Object to keep information pertaining to a signature. */
 115 typedef struct
 116 {
 117   struct
 118   {
 119     unsigned checked:1;         /* Signature has been checked. */
 120     unsigned valid:1;           /* Signature is good (if checked is set). */
 121     unsigned chosen_selfsig:1;  /* A selfsig that is the chosen one. */
 122     unsigned unknown_critical:1;
 123     unsigned exportable:1;
 124     unsigned revocable:1;
 125     unsigned policy_url:1;  /* At least one policy URL is present */
 126     unsigned notation:1;    /* At least one notation is present */
 127     unsigned pref_ks:1;     /* At least one preferred keyserver is present */
 128     unsigned expired:1;
 129     unsigned pka_tried:1;   /* Set if we tried to retrieve the PKA record. */
 130   } flags;
 131   u32     keyid[2];       /* 64 bit keyid */
 132   u32     timestamp;      /* Signature made (seconds since Epoch). */
 133   u32     expiredate;     /* Expires at this date or 0 if not at all. */
 134   byte    version;
 135   byte    sig_class;      /* Sig classification, append for MD calculation. */
 136   byte    pubkey_algo;    /* Algorithm used for public key scheme */
 137                           /* (PUBKEY_ALGO_xxx) */
 138   byte    digest_algo;    /* Algorithm used for digest (DIGEST_ALGO_xxxx). */
 139   byte    trust_depth;
 140   byte    trust_value;
 141   const byte *trust_regexp;
 142   struct revocation_key **revkey;
 143   int numrevkeys;
 144   pka_info_t *pka_info;      /* Malloced PKA data or NULL if not
 145                                 available.  See also flags.pka_tried. */
 146   subpktarea_t *hashed;      /* All subpackets with hashed data (v4 only). */
 147   subpktarea_t *unhashed;    /* Ditto for unhashed data. */
 148   byte digest_start[2];      /* First 2 bytes of the digest. */
 149   gcry_mpi_t  data[PUBKEY_MAX_NSIG];
 150 } PKT_signature;
 151
 152 #define ATTRIB_IMAGE 1
 153
 154 /* This is the cooked form of attributes */
 155 struct user_attribute {
 156   byte type;
 157   const byte *data;
 158   u32 len;
 159 };
 160
 161 typedef struct
 162 {
 163   int ref;              /* reference counter */
 164   int len;              /* length of the name */
 165   struct user_attribute *attribs;
 166   int numattribs;
 167   byte *attrib_data;    /* if this is not NULL, the packet is an attribute */
 168   unsigned long attrib_len;
 169   byte *namehash;
 170   int help_key_usage;
 171   u32 help_key_expire;
 172   int help_full_count;
 173   int help_marginal_count;
 174   int is_primary;       /* 2 if set via the primary flag, 1 if calculated */
 175   int is_revoked;
 176   int is_expired;
 177   u32 expiredate;       /* expires at this date or 0 if not at all */
 178   prefitem_t *prefs;    /* list of preferences (may be NULL)*/
 179   u32 created;          /* according to the self-signature */
 180   byte selfsigversion;
 181   struct
 182   {
 183     /* TODO: Move more flags here */
 184     unsigned mdc:1;
 185     unsigned ks_modify:1;
 186     unsigned compacted:1;
 187   } flags;
 188   char name[1];
 189 } PKT_user_id;
 190
 191 struct revoke_info
 192 {
 193   /* revoked at this date */
 194   u32 date;
 195   /* the keyid of the revoking key (selfsig or designated revoker) */
 196   u32 keyid[2];
 197   /* the algo of the revoking key */
 198   byte algo;
 199 };
 200
 201 /****************
 202  * Note about the pkey/skey elements:  We assume that the secret keys
 203  * has the same elemts as the public key at the begin of the array, so
 204  * that npkey < nskey and it is possible to compare the secret and
 205  * public keys by comparing the first npkey elements of pkey againts skey.
 206  */
 207 typedef struct {
 208     u32     timestamp;      /* key made */
 209     u32     expiredate;     /* expires at this date or 0 if not at all */
 210     u32     max_expiredate; /* must not expire past this date */
 211     struct revoke_info revoked;
 212     byte    hdrbytes;       /* number of header bytes */
 213     byte    version;
 214     byte    selfsigversion; /* highest version of all of the self-sigs */
 215     byte    pubkey_algo;    /* algorithm used for public key scheme */
 216     byte    pubkey_usage;   /* for now only used to pass it to getkey() */
 217     byte    req_usage;      /* hack to pass a request to getkey() */
 218     byte    req_algo;       /* Ditto */
 219     u32     has_expired;    /* set to the expiration date if expired */
 220     int     is_revoked;     /* key has been revoked, 1 if by the
 221                                owner, 2 if by a designated revoker */
 222     int     maybe_revoked;  /* a designated revocation is present, but
 223                                without the key to check it */
 224     int     is_valid;       /* key (especially subkey) is valid */
 225     int     dont_cache;     /* do not cache this */
 226     byte    backsig;        /* 0=none, 1=bad, 2=good */
 227     u32     main_keyid[2];  /* keyid of the primary key */
 228     u32     keyid[2];       /* calculated by keyid_from_pk() */
 229     byte    is_primary;
 230     byte    is_disabled;    /* 0 for unset, 1 for enabled, 2 for disabled. */
 231     prefitem_t *prefs;      /* list of preferences (may be NULL) */
 232     int     mdc_feature;    /* mdc feature set */
 233     PKT_user_id *user_id;   /* if != NULL: found by that uid */
 234     struct revocation_key *revkey;
 235     int     numrevkeys;
 236     u32     trust_timestamp;
 237     byte    trust_depth;
 238     byte    trust_value;
 239     const byte *trust_regexp;
 240     gcry_mpi_t     pkey[PUBKEY_MAX_NPKEY];
 241 } PKT_public_key;
 242
 243 /* Evaluates as true if the pk is disabled, and false if it isn't.  If
 244    there is no disable value cached, fill one in. */
 245 #define pk_is_disabled(a) (((a)->is_disabled)?((a)->is_disabled==2):(cache_disabled_value((a))))
 246
 247 typedef struct {
 248     u32     timestamp;      /* key made */
 249     u32     expiredate;     /* expires at this date or 0 if not at all */
 250     u32     max_expiredate; /* must not expire past this date */
 251     byte    hdrbytes;       /* number of header bytes */
 252     byte    version;
 253     byte    pubkey_algo;    /* algorithm used for public key scheme */
 254     byte    pubkey_usage;
 255     byte    req_usage;
 256     byte    req_algo;
 257     u32     has_expired;    /* set to the expiration date if expired */
 258     int     is_revoked;     /* key has been revoked */
 259     int     is_valid;       /* key (especially subkey) is valid */
 260     u32     main_keyid[2];  /* keyid of the primary key */
 261     u32     keyid[2];
 262     byte is_primary;
 263     byte is_protected;  /* The secret info is protected and must */
 264                         /* be decrypted before use, the protected */
 265                         /* MPIs are simply (void*) pointers to memory */
 266                         /* and should never be passed to a mpi_xxx() */
 267     struct {
 268         byte algo;  /* cipher used to protect the secret information*/
 269         byte sha1chk;  /* SHA1 is used instead of a 16 bit checksum */
 270         STRING2KEY s2k;
 271         byte ivlen;  /* used length of the iv */
 272         byte iv[16]; /* initialization vector for CFB mode */
 273     } protect;
 274     gcry_mpi_t skey[PUBKEY_MAX_NSKEY];
 275     u16 csum;           /* checksum */
 276 } PKT_secret_key;
 277
 278
 279 typedef struct {
 280     int  len;             /* length of data */
 281     char data[1];
 282 } PKT_comment;
 283
 284 typedef struct {
 285     u32  len;             /* reserved */
 286     byte  new_ctb;
 287     byte  algorithm;
 288     iobuf_t buf;          /* IOBUF reference */
 289 } PKT_compressed;
 290
 291 typedef struct {
 292     u32  len;             /* length of encrypted data */
 293     int  extralen;        /* this is (blocksize+2) */
 294     byte new_ctb;         /* uses a new CTB */
 295     byte is_partial;      /* partial length encoded */
 296     byte mdc_method;      /* > 0: integrity protected encrypted data packet */
 297     iobuf_t buf;          /* IOBUF reference */
 298 } PKT_encrypted;
 299
 300 typedef struct {
 301     byte hash[20];
 302 } PKT_mdc;
 303
 304 typedef struct {
 305     unsigned int trustval;
 306     unsigned int sigcache;
 307 } PKT_ring_trust;
 308
 309 typedef struct {
 310     u32  len;             /* length of encrypted data */
 311     iobuf_t buf;          /* IOBUF reference */
 312     byte new_ctb;
 313     byte is_partial;      /* partial length encoded */
 314     int mode;
 315     u32 timestamp;
 316     int  namelen;
 317     char name[1];
 318 } PKT_plaintext;
 319
 320 typedef struct {
 321     int  control;
 322     size_t datalen;
 323     char data[1];
 324 } PKT_gpg_control;
 325
 326 /* combine all packets into a union */
 327 struct packet_struct {
 328     pkttype_t pkttype;
 329     union {
 330         void *generic;
 331         PKT_symkey_enc  *symkey_enc;    /* PKT_SYMKEY_ENC */
 332         PKT_pubkey_enc  *pubkey_enc;    /* PKT_PUBKEY_ENC */
 333         PKT_onepass_sig *onepass_sig;   /* PKT_ONEPASS_SIG */
 334         PKT_signature   *signature;     /* PKT_SIGNATURE */
 335         PKT_public_key  *public_key;    /* PKT_PUBLIC_[SUB)KEY */
 336         PKT_secret_key  *secret_key;    /* PKT_SECRET_[SUB]KEY */
 337         PKT_comment     *comment;       /* PKT_COMMENT */
 338         PKT_user_id     *user_id;       /* PKT_USER_ID */
 339         PKT_compressed  *compressed;    /* PKT_COMPRESSED */
 340         PKT_encrypted   *encrypted;     /* PKT_ENCRYPTED[_MDC] */
 341         PKT_mdc         *mdc;           /* PKT_MDC */
 342         PKT_ring_trust  *ring_trust;    /* PKT_RING_TRUST */
 343         PKT_plaintext   *plaintext;     /* PKT_PLAINTEXT */
 344         PKT_gpg_control *gpg_control;   /* PKT_GPG_CONTROL */
 345     } pkt;
 346 };
 347
 348 #define init_packet(a) do { (a)->pkttype = 0;           \
 349                             (a)->pkt.generic = NULL;    \
 350                        } while(0)
 351
 352
 353 struct notation
 354 {
 355   char *name;
 356   char *value;
 357   char *altvalue;
 358   unsigned char *bdat;
 359   size_t blen;
 360   struct
 361   {
 362     unsigned int critical:1;
 363     unsigned int ignore:1;
 364   } flags;
 365   struct notation *next;
 366 };
 367
 368 /*-- mainproc.c --*/
 369 void reset_literals_seen(void);
 370 int proc_packets( void *ctx, iobuf_t a );
 371 int proc_signature_packets( void *ctx, iobuf_t a,
 372                             strlist_t signedfiles, const char *sigfile );
 373 int proc_signature_packets_by_fd ( void *anchor, IOBUF a, int signed_data_fd );
 374 int proc_encryption_packets( void *ctx, iobuf_t a );
 375 int list_packets( iobuf_t a );
 376
 377 /*-- parse-packet.c --*/
 378 int set_packet_list_mode( int mode );
 379
 380 #if DEBUG_PARSE_PACKET
 381 int dbg_search_packet( iobuf_t inp, PACKET *pkt, off_t *retpos, int with_uid,
 382                        const char* file, int lineno  );
 383 int dbg_parse_packet( iobuf_t inp, PACKET *ret_pkt,
 384                       const char* file, int lineno );
 385 int dbg_copy_all_packets( iobuf_t inp, iobuf_t out,
 386                           const char* file, int lineno  );
 387 int dbg_copy_some_packets( iobuf_t inp, iobuf_t out, off_t stopoff,
 388                            const char* file, int lineno  );
 389 int dbg_skip_some_packets( iobuf_t inp, unsigned n,
 390                            const char* file, int lineno );
 391 #define search_packet( a,b,c,d )   \
 392              dbg_search_packet( (a), (b), (c), (d), __FILE__, __LINE__ )
 393 #define parse_packet( a, b )  \
 394              dbg_parse_packet( (a), (b), __FILE__, __LINE__ )
 395 #define copy_all_packets( a,b )  \
 396              dbg_copy_all_packets((a),(b), __FILE__, __LINE__ )
 397 #define copy_some_packets( a,b,c ) \
 398              dbg_copy_some_packets((a),(b),(c), __FILE__, __LINE__ )
 399 #define skip_some_packets( a,b ) \
 400              dbg_skip_some_packets((a),(b), __FILE__, __LINE__ )
 401 #else
 402 int search_packet( iobuf_t inp, PACKET *pkt, off_t *retpos, int with_uid );
 403 int parse_packet( iobuf_t inp, PACKET *ret_pkt);
 404 int copy_all_packets( iobuf_t inp, iobuf_t out );
 405 int copy_some_packets( iobuf_t inp, iobuf_t out, off_t stopoff );
 406 int skip_some_packets( iobuf_t inp, unsigned n );
 407 #endif
 408
 409 int parse_signature( iobuf_t inp, int pkttype, unsigned long pktlen,
 410                      PKT_signature *sig );
 411 const byte *enum_sig_subpkt ( const subpktarea_t *subpkts,
 412                               sigsubpkttype_t reqtype,
 413                               size_t *ret_n, int *start, int *critical );
 414 const byte *parse_sig_subpkt ( const subpktarea_t *buffer,
 415                                sigsubpkttype_t reqtype,
 416                                size_t *ret_n );
 417 const byte *parse_sig_subpkt2 ( PKT_signature *sig,
 418                                 sigsubpkttype_t reqtype,
 419                                 size_t *ret_n );
 420 int parse_one_sig_subpkt( const byte *buffer, size_t n, int type );
 421 void parse_revkeys(PKT_signature *sig);
 422 int parse_attribute_subpkts(PKT_user_id *uid);
 423 void make_attribute_uidname(PKT_user_id *uid, size_t max_namelen);
 424 PACKET *create_gpg_control ( ctrlpkttype_t type,
 425                              const byte *data,
 426                              size_t datalen );
 427
 428 /*-- build-packet.c --*/
 429 int build_packet( iobuf_t inp, PACKET *pkt );
 430 u32 calc_packet_length( PACKET *pkt );
 431 void build_sig_subpkt( PKT_signature *sig, sigsubpkttype_t type,
 432                         const byte *buffer, size_t buflen );
 433 void build_sig_subpkt_from_sig( PKT_signature *sig );
 434 int  delete_sig_subpkt(subpktarea_t *buffer, sigsubpkttype_t type );
 435 void build_attribute_subpkt(PKT_user_id *uid,byte type,
 436                             const void *buf,u32 buflen,
 437                             const void *header,u32 headerlen);
 438 struct notation *string_to_notation(const char *string,int is_utf8);
 439 struct notation *sig_to_notation(PKT_signature *sig);
 440 void free_notation(struct notation *notation);
 441
 442 /*-- free-packet.c --*/
 443 void free_symkey_enc( PKT_symkey_enc *enc );
 444 void free_pubkey_enc( PKT_pubkey_enc *enc );
 445 void free_seckey_enc( PKT_signature *enc );
 446 int  digest_algo_from_sig( PKT_signature *sig );
 447 void release_public_key_parts( PKT_public_key *pk );
 448 void free_public_key( PKT_public_key *key );
 449 void release_secret_key_parts( PKT_secret_key *sk );
 450 void free_secret_key( PKT_secret_key *sk );
 451 void free_attributes(PKT_user_id *uid);
 452 void free_user_id( PKT_user_id *uid );
 453 void free_comment( PKT_comment *rem );
 454 void free_packet( PACKET *pkt );
 455 prefitem_t *copy_prefs (const prefitem_t *prefs);
 456 PKT_public_key *copy_public_key( PKT_public_key *d, PKT_public_key *s );
 457 void copy_public_parts_to_secret_key( PKT_public_key *pk, PKT_secret_key *sk );
 458 PKT_secret_key *copy_secret_key( PKT_secret_key *d, PKT_secret_key *s );
 459 PKT_signature *copy_signature( PKT_signature *d, PKT_signature *s );
 460 PKT_user_id *scopy_user_id (PKT_user_id *sd );
 461 int cmp_public_keys( PKT_public_key *a, PKT_public_key *b );
 462 int cmp_secret_keys( PKT_secret_key *a, PKT_secret_key *b );
 463 int cmp_signatures( PKT_signature *a, PKT_signature *b );
 464 int cmp_public_secret_key( PKT_public_key *pk, PKT_secret_key *sk );
 465 int cmp_user_ids( PKT_user_id *a, PKT_user_id *b );
 466
 467
 468 /*-- sig-check.c --*/
 469 int signature_check( PKT_signature *sig, gcry_md_hd_t digest );
 470 int signature_check2( PKT_signature *sig, gcry_md_hd_t digest, u32 *r_expiredate,
 471                       int *r_expired, int *r_revoked, PKT_public_key *ret_pk );
 472
 473 /*-- seckey-cert.c --*/
 474 int is_secret_key_protected( PKT_secret_key *sk );
 475 int check_secret_key( PKT_secret_key *sk, int retries );
 476 int protect_secret_key( PKT_secret_key *sk, DEK *dek );
 477
 478 /*-- pubkey-enc.c --*/
 479 int get_session_key( PKT_pubkey_enc *k, DEK *dek );
 480 int get_override_session_key( DEK *dek, const char *string );
 481
 482 /*-- compress.c --*/
 483 int handle_compressed( void *ctx, PKT_compressed *cd,
 484                        int (*callback)(iobuf_t, void *), void *passthru );
 485
 486 /*-- encr-data.c --*/
 487 int decrypt_data( void *ctx, PKT_encrypted *ed, DEK *dek );
 488
 489 /*-- plaintext.c --*/
 490 int handle_plaintext( PKT_plaintext *pt, md_filter_context_t *mfx,
 491                                         int nooutput, int clearsig );
 492 int ask_for_detached_datafile( gcry_md_hd_t md, gcry_md_hd_t md2,
 493                                const char *inname, int textmode );
 494
 495 /*-- sign.c --*/
 496 int make_keysig_packet( PKT_signature **ret_sig, PKT_public_key *pk,
 497                         PKT_user_id *uid, PKT_public_key *subpk,
 498                         PKT_secret_key *sk, int sigclass, int digest_algo,
 499                         int sigversion, u32 timestamp, u32 duration,
 500                         int (*mksubpkt)(PKT_signature *, void *),
 501                         void *opaque  );
 502 int update_keysig_packet( PKT_signature **ret_sig,
 503                       PKT_signature *orig_sig,
 504                       PKT_public_key *pk,
 505                       PKT_user_id *uid,
 506                       PKT_public_key *subpk,
 507                       PKT_secret_key *sk,
 508                       int (*mksubpkt)(PKT_signature *, void *),
 509                       void *opaque   );
 510
 511 /*-- keygen.c --*/
 512 PKT_user_id *generate_user_id (KBNODE keyblock);
 513
 514 #endif /*G10_PACKET_H*/