repos/pEpEngine: src/message_api.c@3036eafdd1eb

     1 #include "pEp_internal.h"

     2 #include "message_api.h"

     4 #include "platform.h"

     5 #include "mime.h"

     7 #include <assert.h>

     8 #include <string.h>

     9 #include <stdlib.h>

    11 #ifndef MIN

    12 #define MIN(A, B) ((B) > (A) ? (A) : (B))

    13 #endif

    14 #ifndef MAX

    15 #define MAX(A, B) ((B) > (A) ? (B) : (A))

    16 #endif

    19 static bool string_equality(const char *s1, const char *s2)

    20 {

    21     if (s1 == NULL || s2 == NULL)

    22         return false;

    24     assert(s1 && s2);

    26     return strcmp(s1, s2) == 0;

    27 }

    29 static bool is_mime_type(const bloblist_t *bl, const char *mt)

    30 {

    31     assert(mt);

    33     return bl && string_equality(bl->mime_type, mt);

    34 }

    36 static bool is_fileending(const bloblist_t *bl, const char *fe)

    37 {

    38     assert(fe);

    40     if (bl == NULL || bl->filename == NULL)

    41         return false;

    43     assert(bl && bl->filename);

    45     size_t fe_len = strlen(fe);

    46     size_t fn_len = strlen(bl->filename);

    48     if (fn_len <= fe_len)

    49         return false;

    51     assert(fn_len > fe_len);

    53     return strcmp(bl->filename + (fn_len - fe_len), fe) == 0;

    54 }

    56 static void add_opt_field(message *msg, const char *name, const char *value)

    57 {

    58     assert(msg);

    60     if (msg && name && value) {

    61         stringpair_t *pair = new_stringpair(name, value);

    62         if (pair == NULL)

    63             return;

    65         stringpair_list_t *field = stringpair_list_add(msg->opt_fields, pair);

    66         if (field == NULL)

    67             return;

    69         if (msg->opt_fields == NULL)

    70             msg->opt_fields = field;

    71     }

    72 }

    74 static char * combine_short_and_long(const char *shortmsg, const char *longmsg)

    75 {

    76     char * ptext;

    78     assert(shortmsg);

    79     assert(strcmp(shortmsg, "pEp") != 0);

    81     if (longmsg == NULL)

    82         longmsg = "";

    84     ptext = calloc(1, strlen(shortmsg) + strlen(longmsg) + 12);

    85     assert(ptext);

    86     if (ptext == NULL)

    87         return NULL;

    89     strcpy(ptext, "Subject: ");

    90     strcat(ptext, shortmsg);

    91     strcat(ptext, "\n\n");

    92     strcat(ptext, longmsg);

    94     return ptext;

    95 }

    97 static int seperate_short_and_long(const char *src, char **shortmsg, char **longmsg)

    98 {

    99     char *_shortmsg = NULL;

   100     char *_longmsg = NULL;

   102     assert(src);

   103     assert(shortmsg);

   104     assert(longmsg);

   106     *shortmsg = NULL;

   107     *longmsg = NULL;

   109     if (strncasecmp(src, "subject: ", 9) == 0) {

   110         char *line_end = strchr(src, '\n');

   112         if (line_end == NULL) {

   113             _shortmsg = strdup(src + 9);

   114             if (_shortmsg == NULL)

   115                 goto enomem;

   116             // _longmsg = NULL;

   117         }

   118         else {

   119             size_t n = line_end - src;

   121             if (*(line_end - 1) == '\r')

   122                 _shortmsg = strndup(src + 9, n - 10);

   123             else

   124                 _shortmsg = strndup(src + 9, n - 9);

   126             if (_shortmsg == NULL)

   127                 goto enomem;

   129             while (*(src + n) && (*(src + n) == '\n' || *(src + n) == '\r'))

   130                 ++n;

   132             if (*(src + n)) {

   133                 _longmsg = strdup(src + n);

   134                 if (_longmsg == NULL)

   135                     goto enomem;

   136             }

   137         }

   138     }

   139     else {

   140         _shortmsg = strdup("");

   141         if (_shortmsg == NULL)

   142             goto enomem;

   143         _longmsg = strdup(src);

   144         if (_longmsg == NULL)

   145             goto enomem;

   146     }

   148     *shortmsg = _shortmsg;

   149     *longmsg = _longmsg;

   151     return 0;

   153 enomem:

   154     free(_shortmsg);

   155     free(_longmsg);

   157     return -1;

   158 }

   160 static PEP_STATUS copy_fields(message *dst, const message *src)

   161 {

   162     assert(dst);

   163     assert(src);

   165     free_timestamp(dst->sent);

   166     dst->sent = NULL;

   167     if (src->sent) {

   168         dst->sent = timestamp_dup(src->sent);

   169         if (dst->sent == NULL)

   170             return PEP_OUT_OF_MEMORY;

   171     }

   173     free_timestamp(dst->recv);

   174     dst->recv = NULL;

   175     if (src->recv) {

   176         dst->recv = timestamp_dup(src->recv);

   177         if (dst->recv == NULL)

   178             return PEP_OUT_OF_MEMORY;

   179     }

   181     free_identity(dst->from);

   182     dst->from = NULL;

   183     if (src->from) {

   184         dst->from = identity_dup(src->from);

   185         if (dst->from == NULL)

   186             return PEP_OUT_OF_MEMORY;

   187     }

   189     free_identity_list(dst->to);

   190     dst->to = NULL;

   191     if (src->to && src->to->ident) {

   192         dst->to = identity_list_dup(src->to);

   193         if (dst->to == NULL)

   194             return PEP_OUT_OF_MEMORY;

   195     }

   197     free_identity(dst->recv_by);

   198     dst->recv_by = NULL;

   199     if (src->recv_by) {

   200         dst->recv_by = identity_dup(src->recv_by);

   201         if (dst->recv_by == NULL)

   202             return PEP_OUT_OF_MEMORY;

   203     }

   205     free_identity_list(dst->cc);

   206     dst->cc = NULL;

   207     if (src->cc && src->cc->ident) {

   208         dst->cc = identity_list_dup(src->cc);

   209         if (dst->cc == NULL)

   210             return PEP_OUT_OF_MEMORY;

   211     }

   213     free_identity_list(dst->bcc);

   214     dst->bcc = NULL;

   215     if (src->bcc && src->bcc->ident) {

   216         dst->bcc = identity_list_dup(src->bcc);

   217         if (dst->bcc == NULL)

   218             return PEP_OUT_OF_MEMORY;

   219     }

   221     free_identity_list(dst->reply_to);

   222     dst->reply_to = NULL;

   223     if (src->reply_to && src->reply_to->ident) {

   224         dst->reply_to = identity_list_dup(src->reply_to);

   225         if (dst->reply_to == NULL)

   226             return PEP_OUT_OF_MEMORY;

   227     }

   229     free_stringlist(dst->in_reply_to);

   230     dst->in_reply_to = NULL;

   231     if (src->in_reply_to && src->in_reply_to->value) {

   232         dst->in_reply_to = stringlist_dup(src->in_reply_to);

   233         if (dst->in_reply_to == NULL)

   234             return PEP_OUT_OF_MEMORY;

   235     }

   237     free_stringlist(dst->references);

   238     dst->references = NULL;

   239     if (src->references) {

   240         dst->references = stringlist_dup(src->references);

   241         if (dst->references == NULL)

   242             return PEP_OUT_OF_MEMORY;

   243     }

   245     free_stringlist(dst->keywords);

   246     dst->keywords = NULL;

   247     if (src->keywords && src->keywords->value) {

   248         dst->keywords = stringlist_dup(src->keywords);

   249         if (dst->keywords == NULL)

   250             return PEP_OUT_OF_MEMORY;

   251     }

   253     free(dst->comments);

   254     dst->comments = NULL;

   255     if (src->comments) {

   256         dst->comments = strdup(src->comments);

   257         assert(dst->comments);

   258         if (dst->comments == NULL)

   259             return PEP_OUT_OF_MEMORY;

   260     }

   262     return PEP_STATUS_OK;

   263 }

   265 static message * clone_to_empty_message(const message * src)

   266 {

   267     PEP_STATUS status;

   268     message * msg = NULL;

   270     assert(src);

   272     msg = calloc(1, sizeof(message));

   273     assert(msg);

   274     if (msg == NULL)

   275         goto enomem;

   277     msg->dir = src->dir;

   279     status = copy_fields(msg, src);

   280     if (status != PEP_STATUS_OK)

   281         goto enomem;

   283     return msg;

   285 enomem:

   286     free_message(msg);

   287     return NULL;

   288 }

   290 static PEP_STATUS encrypt_PGP_MIME(

   291     PEP_SESSION session,

   292     const message *src,

   293     stringlist_t *keys,

   294     message *dst

   295     )

   296 {

   297     PEP_STATUS status = PEP_STATUS_OK;

   298     bool free_ptext = false;

   299     char *ptext;

   300     char *ctext;

   301     char *_ctext = NULL;

   302     char *mimetext = NULL;

   303     size_t csize;

   304     assert(dst->longmsg == NULL);

   305     dst->enc_format = PEP_enc_PGP_MIME;

   307     if (src->shortmsg && strcmp(src->shortmsg, "pEp") != 0) {

   308         ptext = combine_short_and_long(src->shortmsg, src->longmsg);

   309         if (ptext == NULL)

   310             goto enomem;

   311         free_ptext = true;

   312     }

   313     else if (src->longmsg) {

   314         ptext = src->longmsg;

   315     }

   316     else {

   317         ptext = "pEp";

   318     }

   320     message *_src = calloc(1, sizeof(message));

   321     assert(_src);

   322     if (_src == NULL)

   323         goto enomem;

   324     _src->longmsg = ptext;

   325     _src->longmsg_formatted = src->longmsg_formatted;

   326     _src->attachments = src->attachments;

   327     _src->enc_format = PEP_enc_none;

   328     status = mime_encode_message(_src, true, &mimetext);

   329     assert(status == PEP_STATUS_OK);

   330     if (free_ptext)

   331         free(ptext);

   332     free(_src);

   333     assert(mimetext);

   334     if (mimetext == NULL)

   335         goto pep_error;

   337     status = encrypt_and_sign(session, keys, mimetext, strlen(mimetext),

   338         &ctext, &csize);

   339     free(mimetext);

   340     if (ctext == NULL)

   341         goto pep_error;

   343     dst->longmsg = strdup("this message was encrypted with p≡p "

   344         "http://pEp-project.org");

   345     if (dst->longmsg == NULL)

   346         goto enomem;

   348     char *v = strdup("Version: 1");

   349     if (v == NULL)

   350         goto enomem;

   352     bloblist_t *_a = new_bloblist(v, 11, "application/pgp-encrypted", NULL);

   353     if (_a == NULL)

   354         goto enomem;

   355     dst->attachments = _a;

   357     _ctext = malloc(csize);

   358     assert(_ctext);

   359     if (_ctext == NULL)

   360         goto enomem;

   361     memcpy(_ctext, ctext, csize);

   363     _a = bloblist_add(_a, _ctext, csize, "application/octet-stream",

   364         "msg.asc");

   365     if (_a == NULL)

   366         goto enomem;

   368     return PEP_STATUS_OK;

   370 enomem:

   371     status = PEP_OUT_OF_MEMORY;

   373 pep_error:

   374     if (free_ptext)

   375         free(ptext);

   376     free(_ctext);

   377     return status;

   378 }

   380 static PEP_STATUS encrypt_PGP_in_pieces(

   381     PEP_SESSION session,

   382     const message *src,

   383     stringlist_t *keys,

   384     message *dst

   385     )

   386 {

   387     PEP_STATUS status = PEP_STATUS_OK;

   388     char *ctext;

   389     size_t csize;

   391     assert(dst->longmsg == NULL);

   392     assert(dst->attachments == NULL);

   394     dst->enc_format = PEP_enc_pieces;

   396     if (src->shortmsg && src->shortmsg[0] && strcmp(src->shortmsg, "pEp") != 0) {

   397         char *ptext = combine_short_and_long(src->shortmsg, src->longmsg);

   398         if (ptext == NULL)

   399             goto enomem;

   401         status = encrypt_and_sign(session, keys, ptext, strlen(ptext), &ctext,

   402             &csize);

   403         free(ptext);

   404         if (ctext) {

   405             dst->longmsg = strndup(ctext, csize);

   406             assert(dst->longmsg);

   407             if (dst->longmsg == NULL)

   408                 goto enomem;

   409         }

   410         else {

   411             goto pep_error;

   412         }

   413     }

   414     else if (src->longmsg && src->longmsg[0]) {

   415         char *ptext = src->longmsg;

   416         status = encrypt_and_sign(session, keys, ptext, strlen(ptext), &ctext,

   417             &csize);

   418         if (ctext) {

   419             dst->longmsg = strndup(ctext, csize);

   420             assert(dst->longmsg);

   421             if (dst->longmsg == NULL)

   422                 goto enomem;

   423         }

   424         else {

   425             goto pep_error;

   426         }

   427     }

   428     else {

   429         dst->longmsg = strdup("");

   430         if (dst->longmsg == NULL)

   431             goto enomem;

   432     }

   434     if (src->longmsg_formatted && src->longmsg_formatted[0]) {

   435         char *ptext = src->longmsg_formatted;

   436         status = encrypt_and_sign(session, keys, ptext, strlen(ptext), &ctext,

   437             &csize);

   438         if (ctext) {

   439             char *_ctext = malloc(csize);

   440             assert(_ctext);

   441             if (_ctext == NULL)

   442                 goto enomem;

   443             memcpy(_ctext, ctext, csize);

   445             bloblist_t *_a = bloblist_add(dst->attachments, _ctext, csize,

   446                 "application/octet-stream", "PGPexch.htm.pgp");

   447             if (_a == NULL)

   448                 goto enomem;

   449             if (dst->attachments == NULL)

   450                 dst->attachments = _a;

   451         }

   452         else {

   453             goto pep_error;

   454         }

   455     }

   457     if (src->attachments) {

   458         if (dst->attachments == NULL) {

   459             dst->attachments = new_bloblist(NULL, 0, NULL, NULL);

   460             if (dst->attachments == NULL)

   461                 goto enomem;

   462         }

   464         bloblist_t *_s = src->attachments;

   465         bloblist_t *_d = dst->attachments;

   467         for (int n = 0; _s && _s->value; _s = _s->next) {

   468             size_t psize = _s->size;

   469             char *ptext = _s->value;

   470             status = encrypt_and_sign(session, keys, ptext, psize, &ctext,

   471                 &csize);

   472             if (ctext) {

   473                 char *filename = NULL;

   475                 if (_s->filename) {

   476                     size_t len = strlen(_s->filename);

   477                     filename = calloc(1, len + 5);

   478                     if (filename == NULL)

   479                         goto enomem;

   481                     strcpy(filename, _s->filename);

   482                     strcpy(filename + len, ".pgp");

   483                 }

   484                 else {

   485                     filename = calloc(1, 20);

   486                     if (filename == NULL)

   487                         goto enomem;

   489                     ++n;

   490                     n &= 0xffff;

   491                     snprintf(filename, 20, "Attachment%d.pgp", n);

   492                 }

   494                 char *_ctext = malloc(csize);

   495                 assert(_ctext);

   496                 if (_ctext == NULL)

   497                     goto enomem;

   498                 memcpy(_ctext, ctext, csize);

   500                 _d = bloblist_add(_d, _ctext, csize, "application/octet-stream",

   501                     filename);

   502                 if (_d == NULL)

   503                     goto enomem;

   504             }

   505             else {

   506                 goto pep_error;

   507             }

   508         }

   509     }

   511     return PEP_STATUS_OK;

   513 enomem:

   514     status = PEP_OUT_OF_MEMORY;

   516 pep_error:

   517     return status;

   518 }

   520 static char * keylist_to_string(const stringlist_t *keylist)

   521 {

   522     if (keylist) {

   523         size_t size = stringlist_length(keylist);

   525         const stringlist_t *_kl;

   526         for (_kl = keylist; _kl && _kl->value; _kl = _kl->next) {

   527             size += strlen(_kl->value);

   528         }

   530         char *result = calloc(1, size);

   531         if (result == NULL)

   532             return NULL;

   534         char *_r = result;

   535         for (_kl = keylist; _kl && _kl->value; _kl = _kl->next) {

   536             _r = stpcpy(_r, _kl->value);

   537             if (_kl->next && _kl->next->value)

   538                 _r = stpcpy(_r, ",");

   539         }

   541         return result;

   542     }

   543     else {

   544         return NULL;

   545     }

   546 }

   548 static const char * color_to_string(PEP_color color)

   549 {

   550     switch (color) {

   551     case PEP_rating_cannot_decrypt:

   552         return "cannot_decrypt";

   553     case PEP_rating_have_no_key:

   554         return "have_no_key";

   555     case PEP_rating_unencrypted:

   556         return "unencrypted";

   557     case PEP_rating_unreliable:

   558         return "unreliable";

   559     case PEP_rating_reliable:

   560         return "reliable";

   561     case PEP_rating_trusted:

   562         return "trusted";

   563     case PEP_rating_trusted_and_anonymized:

   564         return "trusted_and_anonymized";

   565     case PEP_rating_fully_anonymous:

   566         return "fully_anonymous";

   567     case PEP_rating_under_attack:

   568         return "unter_attack";

   569     case PEP_rating_b0rken:

   570         return "b0rken";

   571     default:

   572         return "undefined";

   573     }

   574 }

   576 static void decorate_message(

   577     message *msg,

   578     PEP_color color,

   579     stringlist_t *keylist

   580     )

   581 {

   582     assert(msg);

   584     add_opt_field(msg, "X-pEp-Version", "1.0");

   586     if (color != PEP_rating_undefined)

   587         add_opt_field(msg, "X-EncStatus", color_to_string(color));

   589     if (keylist) {

   590         char *_keylist = keylist_to_string(keylist);

   591         add_opt_field(msg, "X-KeyList", _keylist);

   592         free(_keylist);

   593     }

   594 }

   596 static PEP_color _rating(PEP_comm_type ct)

   597 {

   598     if (ct == PEP_ct_unknown)

   599         return PEP_rating_undefined;

   601     else if (ct == PEP_ct_compromized)

   602         return PEP_rating_under_attack;

   604     else if (ct >= PEP_ct_confirmed_enc_anon)

   605         return PEP_rating_trusted_and_anonymized;

   607     else if (ct >= PEP_ct_strong_encryption)

   608         return PEP_rating_trusted;

   610     else if (ct >= PEP_ct_strong_but_unconfirmed && ct < PEP_ct_confirmed)

   611         return PEP_rating_reliable;

   613     else if (ct == PEP_ct_no_encryption || ct == PEP_ct_no_encrypted_channel)

   614         return PEP_rating_unencrypted;

   616     else

   617         return PEP_rating_unreliable;

   618 }

   620 static bool is_encrypted_attachment(const bloblist_t *blob)

   621 {

   622     char *ext;

   624     assert(blob);

   626     if (blob->filename == NULL)

   627         return false;

   629     ext = strrchr(blob->filename, '.');

   630     if (ext == NULL)

   631         return false;

   633     if (strcmp(blob->mime_type, "application/octet-stream") == 0) {

   634         if (strcmp(ext, ".pgp") == 0 || strcmp(ext, ".gpg") == 0 ||

   635             strcmp(ext, ".asc") == 0)

   636             return true;

   637     }

   638     else if (strcmp(blob->mime_type, "text/plain") == 0) {

   639         if (strcmp(ext, ".asc") == 0)

   640             return true;

   641     }

   643     return false;

   644 }

   646 static bool is_encrypted_html_attachment(const bloblist_t *blob)

   647 {

   648     assert(blob);

   649     assert(blob->filename);

   651     if (strncmp(blob->filename, "PGPexch.htm.", 12) == 0) {

   652         if (strcmp(blob->filename + 11, ".pgp") == 0 ||

   653             strcmp(blob->filename + 11, ".asc") == 0)

   654             return true;

   655     }

   657     return false;

   658 }

   660 static char * without_double_ending(const char *filename)

   661 {

   662     char *ext;

   664     assert(filename);

   666     ext = strrchr(filename, '.');

   667     if (ext == NULL)

   668         return NULL;

   670     return strndup(filename, ext - filename);

   671 }

   673 static PEP_color decrypt_color(PEP_STATUS status)

   674 {

   675     switch (status) {

   676     case PEP_UNENCRYPTED:

   677     case PEP_VERIFIED:

   678     case PEP_VERIFY_NO_KEY:

   679     case PEP_VERIFIED_AND_TRUSTED:

   680         return PEP_rating_unencrypted;

   682     case PEP_DECRYPTED:

   683         return PEP_rating_unreliable;

   685     case PEP_DECRYPTED_AND_VERIFIED:

   686         return PEP_rating_reliable;

   688     case PEP_DECRYPT_NO_KEY:

   689         return PEP_rating_have_no_key;

   691     case PEP_DECRYPT_WRONG_FORMAT:

   692     case PEP_CANNOT_DECRYPT_UNKNOWN:

   693         return PEP_rating_cannot_decrypt;

   695     default:

   696         return PEP_rating_undefined;

   697     }

   698 }

   700 static PEP_color key_color(PEP_SESSION session, const char *fpr)

   701 {

   702     PEP_comm_type comm_type = PEP_ct_unknown;

   704     assert(session);

   705     assert(fpr);

   707     PEP_STATUS status = get_key_rating(session, fpr, &comm_type);

   708     if (status != PEP_STATUS_OK)

   709         return PEP_rating_undefined;

   711     return _rating(comm_type);

   712 }

   714 static PEP_color keylist_color(PEP_SESSION session, stringlist_t *keylist)

   715 {

   716     PEP_color color = PEP_rating_reliable;

   718     assert(keylist && keylist->value);

   719     if (keylist == NULL || keylist->value == NULL)

   720         return PEP_rating_unencrypted;

   722     stringlist_t *_kl;

   723     for (_kl = keylist; _kl && _kl->value; _kl = _kl->next) {

   724         PEP_comm_type ct;

   725         PEP_STATUS status;

   727         color = key_color(session, _kl->value);

   728         if (color == PEP_rating_under_attack)

   729             return PEP_rating_under_attack;

   731         if (color >= PEP_rating_reliable) {

   732             status = least_trust(session, _kl->value, &ct);

   733             if (status != PEP_STATUS_OK)

   734                 return PEP_rating_undefined;

   735             if (ct == PEP_ct_unknown)

   736                 color = PEP_rating_unreliable;

   737             else

   738                 color = _rating(ct);

   739         }

   740     }

   742     return color;

   743 }

   745 static PEP_comm_type _get_comm_type(

   746     PEP_SESSION session,

   747     PEP_comm_type max_comm_type,

   748     pEp_identity *ident

   749     )

   750 {

   751     PEP_STATUS status = update_identity(session, ident);

   753     if (max_comm_type == PEP_ct_compromized)

   754         return PEP_ct_compromized;

   756     if (status == PEP_STATUS_OK) {

   757         if (ident->comm_type == PEP_ct_compromized)

   758             return PEP_ct_compromized;

   759         else

   760             return MIN(max_comm_type, ident->comm_type);

   761     }

   762     else {

   763         return PEP_ct_unknown;

   764     }

   765 }

   767 void import_attached_keys(PEP_SESSION session, const message *msg)

   768 {

   769     assert(session);

   770     assert(msg);

   772     bloblist_t *bl;

   773     for (bl = msg->attachments; bl && bl->value; bl = bl->next) {

   774         assert(bl && bl->value && bl->size);

   776         if (bl->mime_type == NULL ||

   777                     is_mime_type(bl, "application/octet-stream")) {

   778             if (is_fileending(bl, ".pgp") || is_fileending(bl, ".gpg") ||

   779                     is_fileending(bl, ".key") ||

   780                     string_equality(bl->filename, "key.asc"))

   781                 import_key(session, bl->value, bl->size);

   782         }

   783         else if (is_mime_type(bl, "application/pgp-keys")) {

   784             import_key(session, bl->value, bl->size);

   785         }

   786         else if (is_mime_type(bl, "text/plain")) {

   787             if (is_fileending(bl, ".pgp") || is_fileending(bl, ".gpg") ||

   788                     is_fileending(bl, ".key") || is_fileending(bl, ".asc"))

   789                 import_key(session, bl->value, bl->size);

   790         }

   791     }

   792 }

   794 void attach_own_key(PEP_SESSION session, message *msg)

   795 {

   796     char *keydata;

   797     size_t size;

   798     bloblist_t *bl;

   800     assert(session);

   801     assert(msg);

   803     if (msg->dir == PEP_dir_incoming)

   804         return;

   806     assert(msg->from && msg->from->fpr);

   807     if (msg->from == NULL || msg->from->fpr == NULL)

   808         return;

   810     PEP_STATUS status = export_key(session, msg->from->fpr, &keydata, &size);

   811     assert(status == PEP_STATUS_OK);

   812     if (status != PEP_STATUS_OK)

   813         return;

   814     assert(size);

   816     bl = bloblist_add(msg->attachments, keydata, size, "application/pgp-keys",

   817             "pEp_key.asc");

   818     if (msg->attachments == NULL && bl)

   819         msg->attachments = bl;

   820 }

   822 PEP_cryptotech determine_encryption_format(message *msg)

   823 {

   824     assert(msg);

   826     if (is_PGP_message_text(msg->longmsg)) {

   827         msg->enc_format = PEP_enc_pieces;

   828         return PEP_crypt_OpenPGP;

   829     }

   830     else if (msg->attachments && msg->attachments->next &&

   831             is_mime_type(msg->attachments, "application/pgp-encrypted") &&

   832             is_PGP_message_text(msg->attachments->next->value)

   833         ) {

   834         msg->enc_format = PEP_enc_PGP_MIME;

   835         return PEP_crypt_OpenPGP;

   836     }

   837     else {

   838         msg->enc_format = PEP_enc_none;

   839         return PEP_crypt_none;

   840     }

   841 }

   843 DYNAMIC_API PEP_STATUS encrypt_message(

   844         PEP_SESSION session,

   845         message *src,

   846         stringlist_t * extra,

   847         message **dst,

   848         PEP_enc_format enc_format

   849     )

   850 {

   851     PEP_STATUS status = PEP_STATUS_OK;

   852     message * msg = NULL;

   853     stringlist_t * keys = NULL;

   855     assert(session);

   856     assert(src);

   857     assert(dst);

   858     assert(enc_format != PEP_enc_none);

   860     if (!(session && src && dst && enc_format != PEP_enc_none))

   861         return PEP_ILLEGAL_VALUE;

   863     determine_encryption_format(src);

   864     if (src->enc_format != PEP_enc_none)

   865         return PEP_ILLEGAL_VALUE;

   867     *dst = NULL;

   869     status = myself(session, src->from);

   870     if (status != PEP_STATUS_OK)

   871         goto pep_error;

   873     keys = new_stringlist(src->from->fpr);

   874     if (keys == NULL)

   875         goto enomem;

   877     stringlist_t *_k = keys;

   879     if (extra) {

   880         _k = stringlist_append(_k, extra);

   881         if (_k == NULL)

   882             goto enomem;

   883     }

   885     bool dest_keys_found = true;

   887     identity_list * _il;

   888     for (_il = src->to; _il && _il->ident; _il = _il->next) {

   889         PEP_STATUS _status = update_identity(session, _il->ident);

   890         if (_status != PEP_STATUS_OK) {

   891             status = _status;

   892             goto pep_error;

   893         }

   895         if (_il->ident->fpr && _il->ident->fpr[0]) {

   896             _k = stringlist_add(_k, _il->ident->fpr);

   897             if (_k == NULL)

   898                 goto enomem;

   899         }

   900         else {

   901             dest_keys_found = false;

   902             status = PEP_KEY_NOT_FOUND;

   903         }

   904     }

   906     for (_il = src->cc; _il && _il->ident; _il = _il->next) {

   907         PEP_STATUS _status = update_identity(session, _il->ident);

   908         if (_status != PEP_STATUS_OK)

   909         {

   910             status = _status;

   911             goto pep_error;

   912         }

   914         if (_il->ident->fpr && _il->ident->fpr[0]) {

   915             _k = stringlist_add(_k, _il->ident->fpr);

   916             if (_k == NULL)

   917                 goto enomem;

   918         }

   919         else {

   920             dest_keys_found = false;

   921             status = PEP_KEY_NOT_FOUND;

   922         }

   923     }

   925     if (!dest_keys_found) {

   926         free_stringlist(keys);

   927         attach_own_key(session, src);

   928         return PEP_UNENCRYPTED;

   929     }

   930     else {

   931         msg = clone_to_empty_message(src);

   932         if (msg == NULL)

   933             goto enomem;

   935         switch (enc_format) {

   936         case PEP_enc_PGP_MIME:

   937             status = encrypt_PGP_MIME(session, src, keys, msg);

   938             if (status != PEP_STATUS_OK)

   939                 goto pep_error;

   940             break;

   942         case PEP_enc_pieces:

   943             status = encrypt_PGP_in_pieces(session, src, keys, msg);

   944             if (status == PEP_OUT_OF_MEMORY)

   945                 goto enomem;

   946             if (status != PEP_STATUS_OK) {

   947                 attach_own_key(session, src);

   948                 goto pep_error;

   949             }

   950             else {

   951                 attach_own_key(session, msg);

   952             }

   953             break;

   955         case PEP_enc_PEP:

   956             // TODO: implement

   957             NOT_IMPLEMENTED

   959         default:

   960             assert(0);

   961             status = PEP_ILLEGAL_VALUE;

   962             goto pep_error;

   963         }

   964     }

   966     free_stringlist(keys);

   968     if (msg && msg->shortmsg == NULL)

   969         msg->shortmsg = strdup("pEp");

   971     if (msg)

   972         decorate_message(msg, PEP_rating_undefined, NULL);

   974     *dst = msg;

   975     return status;

   977 enomem:

   978     status = PEP_OUT_OF_MEMORY;

   980 pep_error:

   981     free_stringlist(keys);

   982     free_message(msg);

   984     return status;

   985 }

   987 DYNAMIC_API PEP_STATUS decrypt_message(

   988         PEP_SESSION session,

   989         message *src,

   990         message **dst,

   991         stringlist_t **keylist,

   992         PEP_color *color

   993     )

   994 {

   995     PEP_STATUS status = PEP_STATUS_OK;

   996     PEP_STATUS decrypt_status = PEP_CANNOT_DECRYPT_UNKNOWN;

   997     message *msg = NULL;

   998     char *ctext;

   999     size_t csize;

  1000     char *ptext = NULL;

  1001     size_t psize;

  1002     stringlist_t *_keylist = NULL;

  1004     assert(session);

  1005     assert(src);

  1006     assert(dst);

  1007     assert(keylist);

  1008     assert(color);

  1010     if (!(session && src && dst && keylist && color))

  1011         return PEP_ILLEGAL_VALUE;

  1013     import_attached_keys(session, src);

  1014     PEP_cryptotech crypto = determine_encryption_format(src);

  1016     *dst = NULL;

  1017     *keylist = NULL;

  1018     *color = PEP_rating_undefined;

  1020     switch (src->enc_format) {

  1021         case PEP_enc_none:

  1022             *color = PEP_rating_unencrypted;

  1023             return PEP_UNENCRYPTED;

  1025         case PEP_enc_PGP_MIME:

  1026             ctext = src->attachments->next->value;

  1027             csize = src->attachments->next->size;

  1029             status = cryptotech[crypto].decrypt_and_verify(session, ctext,

  1030                     csize, &ptext, &psize, &_keylist);

  1031             if (status > PEP_CANNOT_DECRYPT_UNKNOWN)

  1032                 goto pep_error;

  1033             decrypt_status = status;

  1034             break;

  1036         case PEP_enc_pieces:

  1037             ctext = src->longmsg;

  1038             csize = strlen(ctext);

  1040             status = cryptotech[crypto].decrypt_and_verify(session, ctext,

  1041                     csize, &ptext, &psize, &_keylist);

  1042             if (status > PEP_CANNOT_DECRYPT_UNKNOWN)

  1043                 goto pep_error;

  1044             decrypt_status = status;

  1045             break;

  1047         default:

  1048             NOT_IMPLEMENTED

  1049     }

  1051     *color = decrypt_color(status);

  1053     if (*color != PEP_rating_under_attack) {

  1054         PEP_color kl_color = PEP_rating_undefined;

  1056         if (_keylist)

  1057             kl_color = keylist_color(session, _keylist);

  1059         if (kl_color == PEP_rating_under_attack)

  1060             *color = PEP_rating_under_attack;

  1062         else if (*color >= PEP_rating_reliable &&

  1063                 kl_color < PEP_rating_reliable)

  1064             *color = PEP_rating_unreliable;

  1066         else if (*color >= PEP_rating_reliable &&

  1067                 kl_color >= PEP_rating_trusted)

  1068             *color = kl_color;

  1069     }

  1071     if (ptext) {

  1072         switch (src->enc_format) {

  1073             case PEP_enc_PGP_MIME:

  1074                 status = mime_decode_message(ptext, psize, &msg);

  1075                 if (status != PEP_STATUS_OK)

  1076                     goto pep_error;

  1077                 break;

  1079             case PEP_enc_pieces:

  1080                 msg = clone_to_empty_message(src);

  1081                 if (msg == NULL)

  1082                     goto enomem;

  1084                 msg->longmsg = strdup(ptext);

  1085                 if (msg->longmsg == NULL)

  1086                     goto enomem;

  1088                 bloblist_t *_m = msg->attachments;

  1089                 if (_m == NULL && src->attachments && src->attachments->value) {

  1090                     msg->attachments = new_bloblist(NULL, 0, NULL, NULL);

  1091                     _m = msg->attachments;

  1092                 }

  1094                 bloblist_t *_s;

  1095                 for (_s = src->attachments; _s && _s->value; _s = _s->next) {

  1096                     if (is_encrypted_attachment(_s)) {

  1097                         stringlist_t *_keylist = NULL;

  1098                         ctext = _s->value;

  1099                         csize = _s->size;

  1101                         status = decrypt_and_verify(session, ctext, csize,

  1102                                 &ptext, &psize, &_keylist);

  1103                         free_stringlist(_keylist);

  1105                         if (ptext) {

  1106                             if (is_encrypted_html_attachment(_s)) {

  1107                                 msg->longmsg_formatted = strdup(ptext);

  1108                                 if (msg->longmsg_formatted == NULL)

  1109                                     goto pep_error;

  1110                             }

  1111                             else {

  1112                                 char * mime_type = "application/octet-stream";

  1113                                 char * filename =

  1114                                     without_double_ending(_s->filename);

  1115                                 if (filename == NULL)

  1116                                     goto enomem;

  1118                                 char *_ptext = malloc(psize);

  1119                                 assert(_ptext);

  1120                                 if (_ptext == NULL)

  1121                                     goto enomem;

  1122                                 memcpy(_ptext, ptext, psize);

  1124                                 _m = bloblist_add(_m, _ptext, psize, mime_type,

  1125                                     filename);

  1126                                 if (_m == NULL)

  1127                                     goto enomem;

  1129                                 if (msg->attachments == NULL)

  1130                                     msg->attachments = _m;

  1131                             }

  1132                         }

  1133                         else {

  1134                             char *copy = malloc(_s->size);

  1135                             memcpy(copy, _s->value, _s->size);

  1136                             _m = bloblist_add(_m, copy, _s->size, _s->mime_type, _s->filename);

  1137                             if (_m == NULL)

  1138                                 goto enomem;

  1139                         }

  1140                     }

  1141                     else {

  1142                         char *copy = malloc(_s->size);

  1143                         memcpy(copy, _s->value, _s->size);

  1144                         _m = bloblist_add(_m, copy, _s->size, _s->mime_type, _s->filename);

  1145                         if (_m == NULL)

  1146                             goto enomem;

  1147                     }

  1148                 }

  1150                 break;

  1152             default:

  1153                 // BUG: must implement more

  1154                 NOT_IMPLEMENTED

  1155         }

  1157         switch (src->enc_format) {

  1158             case PEP_enc_PGP_MIME:

  1159             case PEP_enc_pieces:

  1160                 status = copy_fields(msg, src);

  1161                 if (status != PEP_STATUS_OK)

  1162                     goto pep_error;

  1164                 if (src->shortmsg == NULL || strcmp(src->shortmsg, "pEp") == 0)

  1165                 {

  1166                     char * shortmsg;

  1167                     char * longmsg;

  1169                     int r = seperate_short_and_long(msg->longmsg, &shortmsg,

  1170                             &longmsg);

  1171                     if (r == -1)

  1172                         goto enomem;

  1174                     free(msg->shortmsg);

  1175                     free(msg->longmsg);

  1177                     msg->shortmsg = shortmsg;

  1178                     msg->longmsg = longmsg;

  1179                 }

  1180                 else {

  1181                     msg->shortmsg = strdup(src->shortmsg);

  1182                     if (msg->shortmsg == NULL)

  1183                         goto enomem;

  1184                 }

  1185                 break;

  1187             default:

  1188                 // BUG: must implement more

  1189                 NOT_IMPLEMENTED

  1190         }

  1192         import_attached_keys(session, msg);

  1193     }

  1195     if (msg)

  1196         decorate_message(msg, *color, _keylist);

  1198     *dst = msg;

  1199     *keylist = _keylist;

  1201     return PEP_STATUS_OK;

  1203 enomem:

  1204     status = PEP_OUT_OF_MEMORY;

  1206 pep_error:

  1207     free_message(msg);

  1208     free_stringlist(_keylist);

  1210     return status;

  1211 }

  1213 DYNAMIC_API PEP_STATUS outgoing_message_color(

  1214         PEP_SESSION session,

  1215         message *msg,

  1216         PEP_color *color

  1217     )

  1218 {

  1219     PEP_STATUS status = PEP_STATUS_OK;

  1220     PEP_comm_type max_comm_type = PEP_ct_pEp;

  1221     bool comm_type_determined = false;

  1222     identity_list * il;

  1224     assert(session);

  1225     assert(msg);

  1226     assert(msg->from);

  1227     assert(msg->dir == PEP_dir_outgoing);

  1228     assert(color);

  1230     if (!(session && msg && color))

  1231         return PEP_ILLEGAL_VALUE;

  1233     if (msg->from == NULL || msg->dir != PEP_dir_outgoing)

  1234         return PEP_ILLEGAL_VALUE;

  1236     *color = PEP_rating_undefined;

  1238     status = myself(session, msg->from);

  1239     if (status != PEP_STATUS_OK)

  1240         return status;

  1242     for (il = msg->to; il != NULL; il = il->next) {

  1243         if (il->ident) {

  1244             update_identity(session, il->ident);

  1245             max_comm_type = _get_comm_type(session, max_comm_type,

  1246                     il->ident);

  1247             comm_type_determined = true;

  1248         }

  1249     }

  1251     for (il = msg->cc; il != NULL; il = il->next) {

  1252         if (il->ident) {

  1253             update_identity(session, il->ident);

  1254             max_comm_type = _get_comm_type(session, max_comm_type,

  1255                     il->ident);

  1256             comm_type_determined = true;

  1257         }

  1258     }

  1260     if (comm_type_determined == false)

  1261         *color = PEP_rating_undefined;

  1262     else

  1263         *color = MAX(_rating(max_comm_type), PEP_rating_unencrypted);

  1265     return PEP_STATUS_OK;

  1266 }

  1268 DYNAMIC_API PEP_STATUS identity_color(

  1269         PEP_SESSION session,

  1270         pEp_identity *ident,

  1271         PEP_color *color

  1272     )

  1273 {

  1274     PEP_STATUS status = PEP_STATUS_OK;

  1276     assert(session);

  1277     assert(ident);

  1278     assert(color);

  1280     if (!(session && ident && color))

  1281         return PEP_ILLEGAL_VALUE;

  1283     if (ident->me)

  1284         status = myself(session, ident);

  1285     else

  1286         status = update_identity(session, ident);

  1288     if (status == PEP_STATUS_OK)

  1289         *color = _rating(ident->comm_type);

  1291     return status;

  1292 }

author	Volker Birk <vb@pep-project.org>
	Tue, 11 Aug 2015 10:42:30 +0200
changeset 334	3036eafdd1eb
parent 320	2f4098bd3289
child 336	e0ef820caa40
permissions	-rw-r--r--