/* certreqgen.c - Generate a key and a certification [request] * Copyright (C) 2002, 2003, 2005, 2007, 2010, * 2011 Free Software Foundation, Inc. * * This file is part of GnuPG. * * GnuPG is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 3 of the License, or * (at your option) any later version. * * GnuPG is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, see . */ /* The format of the parameter file is described in the manual under "Unattended Usage". Here is an example: $ cat >foo < #include #include #include #include #include #include #include "gpgsm.h" #include #include #include "keydb.h" #include "../common/i18n.h" #include "../common/membuf.h" enum para_name { pKEYTYPE, pKEYLENGTH, pKEYGRIP, pKEYCURVE, pKEYUSAGE, pNAMEDN, pNAMEEMAIL, pNAMEDNS, pNAMEURI, pSERIAL, pISSUERDN, pNOTBEFORE, pNOTAFTER, pSIGNINGKEY, pHASHALGO, pAUTHKEYID, pSUBJKEYID, pEXTENSION }; struct para_data_s { struct para_data_s *next; int lnr; enum para_name key; union { unsigned int usage; char value[1]; } u; }; struct reqgen_ctrl_s { int lnr; int dryrun; }; static const char oidstr_authorityKeyIdentifier[] = "2.5.29.35"; static const char oidstr_subjectKeyIdentifier[] = "2.5.29.14"; static const char oidstr_keyUsage[] = "2.5.29.15"; static const char oidstr_basicConstraints[] = "2.5.29.19"; static const char oidstr_standaloneCertificate[] = "1.3.6.1.4.1.11591.2.2.1"; static int proc_parameters (ctrl_t ctrl, struct para_data_s *para, estream_t out_fp, struct reqgen_ctrl_s *outctrl); static int create_request (ctrl_t ctrl, struct para_data_s *para, const char *carddirect, ksba_const_sexp_t public, ksba_const_sexp_t sigkey, ksba_writer_t writer); static void release_parameter_list (struct para_data_s *r) { struct para_data_s *r2; for (; r ; r = r2) { r2 = r->next; xfree(r); } } static struct para_data_s * get_parameter (struct para_data_s *para, enum para_name key, int seq) { struct para_data_s *r; for (r = para; r ; r = r->next) if ( r->key == key && !seq--) return r; return NULL; } static const char * get_parameter_value (struct para_data_s *para, enum para_name key, int seq) { struct para_data_s *r = get_parameter (para, key, seq); return (r && *r->u.value)? r->u.value : NULL; } static int get_parameter_algo (struct para_data_s *para, enum para_name key) { struct para_data_s *r = get_parameter (para, key, 0); if (!r) return -1; if (digitp (r->u.value)) return atoi( r->u.value ); return gcry_pk_map_name (r->u.value); } /* Parse the usage parameter. Returns 0 on success. Note that we only care about sign and encrypt and don't (yet) allow all the other X.509 usage to be specified; instead we will use a fixed mapping to the X.509 usage flags. */ static int parse_parameter_usage (struct para_data_s *para, enum para_name key) { struct para_data_s *r = get_parameter (para, key, 0); char *p, *pn; unsigned int use; if (!r) return 0; /* none (this is an optional parameter)*/ use = 0; pn = r->u.value; while ( (p = strsep (&pn, " \t,")) ) { if (!*p) ; else if ( !ascii_strcasecmp (p, "sign") ) use |= GCRY_PK_USAGE_SIGN; else if ( !ascii_strcasecmp (p, "encrypt") || !ascii_strcasecmp (p, "encr") ) use |= GCRY_PK_USAGE_ENCR; else if ( !ascii_strcasecmp (p, "cert") ) use |= GCRY_PK_USAGE_CERT; else { log_error ("line %d: invalid usage list\n", r?r->lnr:0); return -1; /* error */ } } r->u.usage = use; return 0; } static unsigned int get_parameter_uint (struct para_data_s *para, enum para_name key) { struct para_data_s *r = get_parameter (para, key, 0); if (!r) return 0; if (r->key == pKEYUSAGE) return r->u.usage; return (unsigned int)strtoul (r->u.value, NULL, 10); } /* Read the certificate generation parameters from FP and generate (all) certificate requests. */ static int read_parameters (ctrl_t ctrl, estream_t fp, estream_t out_fp) { static struct { const char *name; enum para_name key; int allow_dups; } keywords[] = { { "Key-Type", pKEYTYPE}, { "Key-Length", pKEYLENGTH }, { "Key-Grip", pKEYGRIP }, { "Key-Curve", pKEYCURVE }, { "Key-Usage", pKEYUSAGE }, { "Name-DN", pNAMEDN }, { "Name-Email", pNAMEEMAIL, 1 }, { "Name-DNS", pNAMEDNS, 1 }, { "Name-URI", pNAMEURI, 1 }, { "Serial", pSERIAL }, { "Issuer-DN", pISSUERDN }, { "Creation-Date", pNOTBEFORE }, { "Not-Before", pNOTBEFORE }, { "Expire-Date", pNOTAFTER }, { "Not-After", pNOTAFTER }, { "Signing-Key", pSIGNINGKEY }, { "Hash-Algo", pHASHALGO }, { "Authority-Key-Id", pAUTHKEYID }, { "Subject-Key-Id", pSUBJKEYID }, { "Extension", pEXTENSION, 1 }, { NULL, 0 } }; char line[1024], *p; const char *err = NULL; struct para_data_s *para, *r; int i, rc = 0, any = 0; struct reqgen_ctrl_s outctrl; memset (&outctrl, 0, sizeof (outctrl)); err = NULL; para = NULL; while (es_fgets (line, DIM(line)-1, fp) ) { char *keyword, *value; outctrl.lnr++; if (*line && line[strlen(line)-1] != '\n') { err = "line too long"; break; } for (p=line; spacep (p); p++) ; if (!*p || *p == '#') continue; keyword = p; if (*keyword == '%') { for (; *p && !ascii_isspace (*p); p++) ; if (*p) *p++ = 0; for (; ascii_isspace (*p); p++) ; value = p; trim_trailing_spaces (value); if (!ascii_strcasecmp (keyword, "%echo")) log_info ("%s\n", value); else if (!ascii_strcasecmp (keyword, "%dry-run")) outctrl.dryrun = 1; else if (!ascii_strcasecmp( keyword, "%commit")) { rc = proc_parameters (ctrl, para, out_fp, &outctrl); if (rc) goto leave; any = 1; release_parameter_list (para); para = NULL; } else log_info ("skipping control '%s' (%s)\n", keyword, value); continue; } if (!(p = strchr (p, ':')) || p == keyword) { err = "missing colon"; break; } if (*p) *p++ = 0; for (; spacep (p); p++) ; if (!*p) { err = "missing argument"; break; } value = p; trim_trailing_spaces (value); for (i=0; (keywords[i].name && ascii_strcasecmp (keywords[i].name, keyword)); i++) ; if (!keywords[i].name) { err = "unknown keyword"; break; } if (keywords[i].key != pKEYTYPE && !para) { err = "parameter block does not start with \"Key-Type\""; break; } if (keywords[i].key == pKEYTYPE && para) { rc = proc_parameters (ctrl, para, out_fp, &outctrl); if (rc) goto leave; any = 1; release_parameter_list (para); para = NULL; } else if (!keywords[i].allow_dups) { for (r = para; r && r->key != keywords[i].key; r = r->next) ; if (r) { err = "duplicate keyword"; break; } } r = xtrycalloc (1, sizeof *r + strlen( value )); if (!r) { err = "out of core"; break; } r->lnr = outctrl.lnr; r->key = keywords[i].key; strcpy (r->u.value, value); r->next = para; para = r; } if (err) { log_error ("line %d: %s\n", outctrl.lnr, err); rc = gpg_error (GPG_ERR_GENERAL); } else if (es_ferror(fp)) { log_error ("line %d: read error: %s\n", outctrl.lnr, strerror(errno) ); rc = gpg_error (GPG_ERR_GENERAL); } else if (para) { rc = proc_parameters (ctrl, para, out_fp, &outctrl); if (rc) goto leave; any = 1; } if (!rc && !any) rc = gpg_error (GPG_ERR_NO_DATA); leave: release_parameter_list (para); return rc; } /* check whether there are invalid characters in the email address S */ static int has_invalid_email_chars (const char *s) { int at_seen=0; static char valid_chars[] = "01234567890_-." "abcdefghijklmnopqrstuvwxyz" "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; for (; *s; s++) { if (*s & 0x80) return 1; if (*s == '@') at_seen++; else if (!at_seen && !( !!strchr (valid_chars, *s) || *s == '+')) return 1; else if (at_seen && !strchr (valid_chars, *s)) return 1; } return at_seen != 1; } /* Check that all required parameters are given and perform the action */ static int proc_parameters (ctrl_t ctrl, struct para_data_s *para, estream_t out_fp, struct reqgen_ctrl_s *outctrl) { gpg_error_t err; struct para_data_s *r; const char *s, *string; int i; int algo; unsigned int nbits; char numbuf[20]; unsigned char keyparms[100]; int rc = 0; ksba_sexp_t public = NULL; ksba_sexp_t sigkey = NULL; int seq; size_t erroff, errlen; char *cardkeyid = NULL; /* Check that we have all required parameters; */ log_assert (get_parameter (para, pKEYTYPE, 0)); /* There is a problem with pkcs-10 on how to use ElGamal because it is expected that a PK algorithm can always be used for signing. Another problem is that on-card generated encryption keys may not be used for signing. */ algo = get_parameter_algo (para, pKEYTYPE); if (!algo && (s = get_parameter_value (para, pKEYTYPE, 0)) && *s) { /* Hack to allow creation of certificates directly from a smart card. For example: "Key-Type: card:OPENPGP.3". */ if (!strncmp (s, "card:", 5) && s[5]) cardkeyid = xtrystrdup (s+5); } if (algo < 1 && !cardkeyid) { r = get_parameter (para, pKEYTYPE, 0); if (r) log_error (_("line %d: invalid algorithm\n"), r?r->lnr:0); else log_error ("No Key-Type specified\n"); return gpg_error (GPG_ERR_INV_PARAMETER); } /* Check the keylength. NOTE: If you change this make sure that it macthes the gpgconflist item in gpgsm.c */ if (!get_parameter (para, pKEYLENGTH, 0)) nbits = 3072; else nbits = get_parameter_uint (para, pKEYLENGTH); if ((nbits < 1024 || nbits > 4096) && !cardkeyid) { /* The BSI specs dated 2002-11-25 don't allow lengths below 1024. */ r = get_parameter (para, pKEYLENGTH, 0); log_error (_("line %d: invalid key length %u (valid are %d to %d)\n"), r?r->lnr:0, nbits, 1024, 4096); xfree (cardkeyid); return gpg_error (GPG_ERR_INV_PARAMETER); } /* Check the usage. */ if (parse_parameter_usage (para, pKEYUSAGE)) { xfree (cardkeyid); return gpg_error (GPG_ERR_INV_PARAMETER); } /* Check that there is a subject name and that this DN fits our requirements. */ if (!(s=get_parameter_value (para, pNAMEDN, 0))) { r = get_parameter (para, pNAMEDN, 0); log_error (_("line %d: no subject name given\n"), r?r->lnr:0); xfree (cardkeyid); return gpg_error (GPG_ERR_INV_PARAMETER); } err = ksba_dn_teststr (s, 0, &erroff, &errlen); if (err) { r = get_parameter (para, pNAMEDN, 0); if (gpg_err_code (err) == GPG_ERR_UNKNOWN_NAME) log_error (_("line %d: invalid subject name label '%.*s'\n"), r?r->lnr:0, (int)errlen, s+erroff); else log_error (_("line %d: invalid subject name '%s' at pos %d\n"), r?r->lnr:0, s, (int)erroff); xfree (cardkeyid); return gpg_error (GPG_ERR_INV_PARAMETER); } /* Check that the optional email address is okay. */ for (seq=0; (s=get_parameter_value (para, pNAMEEMAIL, seq)); seq++) { if (has_invalid_email_chars (s) || *s == '@' || s[strlen(s)-1] == '@' || s[strlen(s)-1] == '.' || strstr(s, "..")) { r = get_parameter (para, pNAMEEMAIL, seq); log_error (_("line %d: not a valid email address\n"), r?r->lnr:0); xfree (cardkeyid); return gpg_error (GPG_ERR_INV_PARAMETER); } } /* Check the optional serial number. */ string = get_parameter_value (para, pSERIAL, 0); if (string) { if (!strcmp (string, "random")) ; /* Okay. */ else { for (s=string, i=0; hexdigitp (s); s++, i++) ; if (*s) { r = get_parameter (para, pSERIAL, 0); log_error (_("line %d: invalid serial number\n"), r?r->lnr:0); xfree (cardkeyid); return gpg_error (GPG_ERR_INV_PARAMETER); } } } /* Check the optional issuer DN. */ string = get_parameter_value (para, pISSUERDN, 0); if (string) { err = ksba_dn_teststr (string, 0, &erroff, &errlen); if (err) { r = get_parameter (para, pISSUERDN, 0); if (gpg_err_code (err) == GPG_ERR_UNKNOWN_NAME) log_error (_("line %d: invalid issuer name label '%.*s'\n"), r?r->lnr:0, (int)errlen, string+erroff); else log_error (_("line %d: invalid issuer name '%s' at pos %d\n"), r?r->lnr:0, string, (int)erroff); xfree (cardkeyid); return gpg_error (GPG_ERR_INV_PARAMETER); } } /* Check the optional creation date. */ string = get_parameter_value (para, pNOTBEFORE, 0); if (string && !string2isotime (NULL, string)) { r = get_parameter (para, pNOTBEFORE, 0); log_error (_("line %d: invalid date given\n"), r?r->lnr:0); xfree (cardkeyid); return gpg_error (GPG_ERR_INV_PARAMETER); } /* Check the optional expire date. */ string = get_parameter_value (para, pNOTAFTER, 0); if (string && !string2isotime (NULL, string)) { r = get_parameter (para, pNOTAFTER, 0); log_error (_("line %d: invalid date given\n"), r?r->lnr:0); xfree (cardkeyid); return gpg_error (GPG_ERR_INV_PARAMETER); } /* Get the optional signing key. */ string = get_parameter_value (para, pSIGNINGKEY, 0); if (string) { rc = gpgsm_agent_readkey (ctrl, 0, string, &sigkey); if (rc) { r = get_parameter (para, pKEYTYPE, 0); log_error (_("line %d: error getting signing key by keygrip '%s'" ": %s\n"), r?r->lnr:0, s, gpg_strerror (rc)); xfree (cardkeyid); return rc; } } /* Check the optional hash-algo. */ { int mdalgo; string = get_parameter_value (para, pHASHALGO, 0); if (string && !((mdalgo = gcry_md_map_name (string)) && (mdalgo == GCRY_MD_SHA1 || mdalgo == GCRY_MD_SHA256 || mdalgo == GCRY_MD_SHA384 || mdalgo == GCRY_MD_SHA512))) { r = get_parameter (para, pHASHALGO, 0); log_error (_("line %d: invalid hash algorithm given\n"), r?r->lnr:0); xfree (cardkeyid); return gpg_error (GPG_ERR_INV_PARAMETER); } } /* Check the optional AuthorityKeyId. */ string = get_parameter_value (para, pAUTHKEYID, 0); if (string && strcmp (string, "none")) { for (s=string, i=0; hexdigitp (s); s++, i++) ; if (*s || (i&1)) { r = get_parameter (para, pAUTHKEYID, 0); log_error (_("line %d: invalid authority-key-id\n"), r?r->lnr:0); xfree (cardkeyid); return gpg_error (GPG_ERR_INV_PARAMETER); } } /* Check the optional SubjectKeyId. */ string = get_parameter_value (para, pSUBJKEYID, 0); if (string && strcmp (string, "none")) { for (s=string, i=0; hexdigitp (s); s++, i++) ; if (*s || (i&1)) { r = get_parameter (para, pSUBJKEYID, 0); log_error (_("line %d: invalid subject-key-id\n"), r?r->lnr:0); xfree (cardkeyid); return gpg_error (GPG_ERR_INV_PARAMETER); } } /* Check the optional extensions. */ for (seq=0; (string=get_parameter_value (para, pEXTENSION, seq)); seq++) { int okay = 0; s = strpbrk (string, " \t:"); if (s) { s++; while (spacep (s)) s++; if (*s && strchr ("nNcC", *s)) { s++; while (spacep (s)) s++; if (*s == ':') s++; if (*s) { while (spacep (s)) s++; for (i=0; hexdigitp (s); s++, i++) ; if (!((*s && *s != ':') || !i || (i&1))) okay = 1; } } } if (!okay) { r = get_parameter (para, pEXTENSION, seq); log_error (_("line %d: invalid extension syntax\n"), r? r->lnr:0); xfree (cardkeyid); return gpg_error (GPG_ERR_INV_PARAMETER); } } /* Create or retrieve the public key. */ if (cardkeyid) /* Take the key from the current smart card. */ { rc = gpgsm_agent_readkey (ctrl, 1, cardkeyid, &public); if (rc) { r = get_parameter (para, pKEYTYPE, 0); log_error (_("line %d: error reading key '%s' from card: %s\n"), r?r->lnr:0, cardkeyid, gpg_strerror (rc)); xfree (sigkey); xfree (cardkeyid); return rc; } } else if ((s=get_parameter_value (para, pKEYGRIP, 0))) /* Use existing key.*/ { rc = gpgsm_agent_readkey (ctrl, 0, s, &public); if (rc) { r = get_parameter (para, pKEYTYPE, 0); log_error (_("line %d: error getting key by keygrip '%s': %s\n"), r->lnr, s, gpg_strerror (rc)); xfree (sigkey); xfree (cardkeyid); return rc; } } else if (!outctrl->dryrun) /* Generate new key. */ { if (algo == GCRY_PK_RSA) { sprintf (numbuf, "%u", nbits); snprintf ((char*)keyparms, DIM (keyparms), "(6:genkey(3:rsa(5:nbits%d:%s)))", (int)strlen (numbuf), numbuf); } else if (algo == GCRY_PK_ECC) { const char *curve = get_parameter_value (para, pKEYCURVE, 0); const char *flags; if (!strcmp (curve, "Ed25519")) flags = "(5:flags5:eddsa)"; else if (!strcmp (curve, "Curve25519")) flags = "(5:flags9:djb-tweak)"; else flags = ""; snprintf ((char*)keyparms, DIM (keyparms), "(6:genkey(3:ecc(5:curve%zu:%s)%s))", strlen (curve), curve, flags); } else { r = get_parameter (para, pKEYTYPE, 0); log_error (_("line %d: invalid algorithm\n"), r?r->lnr:0); xfree (sigkey); xfree (cardkeyid); return gpg_error (GPG_ERR_INV_PARAMETER); } rc = gpgsm_agent_genkey (ctrl, keyparms, &public); if (rc) { r = get_parameter (para, pKEYTYPE, 0); log_error (_("line %d: key generation failed: %s <%s>\n"), r?r->lnr:0, gpg_strerror (rc), gpg_strsource (rc)); xfree (sigkey); xfree (cardkeyid); return rc; } } if (!outctrl->dryrun) { gnupg_ksba_io_t b64writer = NULL; ksba_writer_t writer; int create_cert ; create_cert = !!get_parameter_value (para, pSERIAL, 0); ctrl->pem_name = create_cert? "CERTIFICATE" : "CERTIFICATE REQUEST"; rc = gnupg_ksba_create_writer (&b64writer, ((ctrl->create_pem? GNUPG_KSBA_IO_PEM : 0) | (ctrl->create_base64? GNUPG_KSBA_IO_BASE64 : 0)), ctrl->pem_name, out_fp, &writer); if (rc) log_error ("can't create writer: %s\n", gpg_strerror (rc)); else { rc = create_request (ctrl, para, cardkeyid, public, sigkey, writer); if (!rc) { rc = gnupg_ksba_finish_writer (b64writer); if (rc) log_error ("write failed: %s\n", gpg_strerror (rc)); else { gpgsm_status (ctrl, STATUS_KEY_CREATED, "P"); log_info ("certificate%s created\n", create_cert?"":" request"); } } gnupg_ksba_destroy_writer (b64writer); } } xfree (sigkey); xfree (public); xfree (cardkeyid); return rc; } /* Parameters are checked, the key pair has been created. Now generate the request and write it out */ static int create_request (ctrl_t ctrl, struct para_data_s *para, const char *carddirect, ksba_const_sexp_t public, ksba_const_sexp_t sigkey, ksba_writer_t writer) { ksba_certreq_t cr; gpg_error_t err; gcry_md_hd_t md; ksba_stop_reason_t stopreason; int rc = 0; const char *s, *string; unsigned int use; int seq; char *buf, *p; size_t len; char numbuf[30]; ksba_isotime_t atime; int certmode = 0; int mdalgo; membuf_t tbsbuffer; membuf_t *tbsmb = NULL; size_t publiclen; size_t sigkeylen; int publicpkalgo; /* The gcrypt public key algo of the public key. */ int sigkeypkalgo; /* The gcrypt public key algo of the signing key. */ err = ksba_certreq_new (&cr); if (err) return err; publiclen = gcry_sexp_canon_len (public, 0, NULL, NULL); sigkeylen = sigkey? gcry_sexp_canon_len (sigkey, 0, NULL, NULL) : 0; publicpkalgo = get_pk_algo_from_canon_sexp (public, publiclen); sigkeypkalgo = sigkey? get_pk_algo_from_canon_sexp (public, publiclen) : 0; if (publicpkalgo == GCRY_PK_EDDSA) { mdalgo = GCRY_MD_SHA512; md = NULL; /* We sign the data and not a hash. */ init_membuf (&tbsbuffer, 2048); tbsmb = &tbsbuffer; ksba_certreq_set_hash_function (cr, (void (*)(void *, const void*,size_t))put_membuf, tbsmb); } else { if ((string = get_parameter_value (para, pHASHALGO, 0))) mdalgo = gcry_md_map_name (string); else mdalgo = GCRY_MD_SHA256; rc = gcry_md_open (&md, mdalgo, 0); if (rc) { log_error ("md_open failed: %s\n", gpg_strerror (rc)); goto leave; } if (DBG_HASHING) gcry_md_debug (md, "cr.cri"); ksba_certreq_set_hash_function (cr, HASH_FNC, md); } ksba_certreq_set_writer (cr, writer); err = ksba_certreq_add_subject (cr, get_parameter_value (para, pNAMEDN, 0)); if (err) { log_error ("error setting the subject's name: %s\n", gpg_strerror (err)); rc = err; goto leave; } for (seq=0; (s = get_parameter_value (para, pNAMEEMAIL, seq)); seq++) { buf = xtrymalloc (strlen (s) + 3); if (!buf) { rc = out_of_core (); goto leave; } *buf = '<'; strcpy (buf+1, s); strcat (buf+1, ">"); err = ksba_certreq_add_subject (cr, buf); xfree (buf); if (err) { log_error ("error setting the subject's alternate name: %s\n", gpg_strerror (err)); rc = err; goto leave; } } for (seq=0; (s = get_parameter_value (para, pNAMEDNS, seq)); seq++) { len = strlen (s); log_assert (len); snprintf (numbuf, DIM(numbuf), "%u:", (unsigned int)len); buf = p = xtrymalloc (11 + strlen (numbuf) + len + 3); if (!buf) { rc = out_of_core (); goto leave; } p = stpcpy (p, "(8:dns-name"); p = stpcpy (p, numbuf); p = stpcpy (p, s); strcpy (p, ")"); err = ksba_certreq_add_subject (cr, buf); xfree (buf); if (err) { log_error ("error setting the subject's alternate name: %s\n", gpg_strerror (err)); rc = err; goto leave; } } for (seq=0; (s = get_parameter_value (para, pNAMEURI, seq)); seq++) { len = strlen (s); log_assert (len); snprintf (numbuf, DIM(numbuf), "%u:", (unsigned int)len); buf = p = xtrymalloc (6 + strlen (numbuf) + len + 3); if (!buf) { rc = out_of_core (); goto leave; } p = stpcpy (p, "(3:uri"); p = stpcpy (p, numbuf); p = stpcpy (p, s); strcpy (p, ")"); err = ksba_certreq_add_subject (cr, buf); xfree (buf); if (err) { log_error ("error setting the subject's alternate name: %s\n", gpg_strerror (err)); rc = err; goto leave; } } err = ksba_certreq_set_public_key (cr, public); if (err) { log_error ("error setting the public key: %s\n", gpg_strerror (err)); rc = err; goto leave; } /* Set key usage flags. */ use = get_parameter_uint (para, pKEYUSAGE); if (use) { unsigned int mask, pos; unsigned char der[4]; der[0] = 0x03; der[1] = 0x02; der[2] = 0; der[3] = 0; if ((use & GCRY_PK_USAGE_SIGN)) { /* For signing only we encode the bits: KSBA_KEYUSAGE_DIGITAL_SIGNATURE KSBA_KEYUSAGE_NON_REPUDIATION = 0b11 -> 0b11000000 */ der[3] |= 0xc0; } if ((use & GCRY_PK_USAGE_ENCR)) { /* For encrypt only we encode the bits: KSBA_KEYUSAGE_KEY_ENCIPHERMENT KSBA_KEYUSAGE_DATA_ENCIPHERMENT = 0b1100 -> 0b00110000 */ der[3] |= 0x30; } if ((use & GCRY_PK_USAGE_CERT)) { /* For certify only we encode the bits: KSBA_KEYUSAGE_KEY_CERT_SIGN KSBA_KEYUSAGE_CRL_SIGN = 0b1100000 -> 0b00000110 */ der[3] |= 0x06; } /* Count number of unused bits. */ for (mask=1, pos=0; pos < 8 * sizeof mask; pos++, mask <<= 1) { if ((der[3] & mask)) break; der[2]++; } err = ksba_certreq_add_extension (cr, oidstr_keyUsage, 1, der, 4); if (err) { log_error ("error setting the key usage: %s\n", gpg_strerror (err)); rc = err; goto leave; } } /* See whether we want to create an X.509 certificate. */ string = get_parameter_value (para, pSERIAL, 0); if (string) { certmode = 1; /* Store the serial number. */ if (!strcmp (string, "random")) { char snbuf[3+8+1]; memcpy (snbuf, "(8:", 3); gcry_create_nonce (snbuf+3, 8); /* Clear high bit to guarantee a positive integer. */ snbuf[3] &= 0x7f; snbuf[3+8] = ')'; err = ksba_certreq_set_serial (cr, snbuf); } else { char *hexbuf; /* Allocate a buffer large enough to prefix the string with a '0' so to have an even number of digits. Prepend two further '0' so that the binary result will have a leading 0 byte and thus can't be the representation of a negative number. Note that ksba_certreq_set_serial strips all unneeded leading 0 bytes. */ hexbuf = p = xtrymalloc (2 + 1 + strlen (string) + 1); if (!hexbuf) { err = gpg_error_from_syserror (); goto leave; } if ((strlen (string) & 1)) *p++ = '0'; *p++ = '0'; *p++ = '0'; strcpy (p, string); for (p=hexbuf, len=0; p[0] && p[1]; p += 2) ((unsigned char*)hexbuf)[len++] = xtoi_2 (p); /* Now build the S-expression. */ snprintf (numbuf, DIM(numbuf), "%u:", (unsigned int)len); buf = p = xtrymalloc (1 + strlen (numbuf) + len + 1 + 1); if (!buf) { err = gpg_error_from_syserror (); xfree (hexbuf); goto leave; } p = stpcpy (stpcpy (buf, "("), numbuf); memcpy (p, hexbuf, len); p += len; strcpy (p, ")"); xfree (hexbuf); err = ksba_certreq_set_serial (cr, buf); xfree (buf); } if (err) { log_error ("error setting the serial number: %s\n", gpg_strerror (err)); goto leave; } /* Store the issuer DN. If no issuer DN is given and no signing key has been set we add the standalone extension and the basic constraints to mark it as a self-signed CA certificate. */ string = get_parameter_value (para, pISSUERDN, 0); if (string) { /* Issuer DN given. Note that this may be the same as the subject DN and thus this could as well be a self-signed certificate. However the caller needs to explicitly specify basicConstraints and so forth. */ err = ksba_certreq_set_issuer (cr, string); if (err) { log_error ("error setting the issuer DN: %s\n", gpg_strerror (err)); goto leave; } } else if (!string && !sigkey) { /* Self-signed certificate requested. Add basicConstraints and the custom GnuPG standalone extension. */ err = ksba_certreq_add_extension (cr, oidstr_basicConstraints, 1, "\x30\x03\x01\x01\xff", 5); if (err) goto leave; err = ksba_certreq_add_extension (cr, oidstr_standaloneCertificate, 0, "\x01\x01\xff", 3); if (err) goto leave; } /* Store the creation date. */ string = get_parameter_value (para, pNOTBEFORE, 0); if (string) { if (!string2isotime (atime, string)) BUG (); /* We already checked the value. */ } else gnupg_get_isotime (atime); err = ksba_certreq_set_validity (cr, 0, atime); if (err) { log_error ("error setting the creation date: %s\n", gpg_strerror (err)); goto leave; } /* Store the expire date. If it is not given, libksba inserts a default value. */ string = get_parameter_value (para, pNOTAFTER, 0); if (string) { if (!string2isotime (atime, string)) BUG (); /* We already checked the value. */ err = ksba_certreq_set_validity (cr, 1, atime); if (err) { log_error ("error setting the expire date: %s\n", gpg_strerror (err)); goto leave; } } /* Figure out the signing algorithm. If no sigkey has been given we set it to the public key to create a self-signed certificate. */ if (!sigkey) { sigkey = public; sigkeylen = publiclen; sigkeypkalgo = publicpkalgo; } /* Set the the digestinfo aka siginfo. */ { unsigned char *siginfo; err = transform_sigval (sigkey, sigkeylen, mdalgo, &siginfo, NULL); if (!err) { err = ksba_certreq_set_siginfo (cr, siginfo); xfree (siginfo); } if (err) { log_error ("error setting the siginfo: %s\n", gpg_strerror (err)); rc = err; goto leave; } } /* Insert the AuthorityKeyId. */ string = get_parameter_value (para, pAUTHKEYID, 0); if (string && !strcmp (string, "none")) ; /* Do not issue an AKI. */ else if (string) { char *hexbuf; /* Allocate a buffer for in-place conversion. We also add 4 extra bytes space for the tags and lengths fields. */ hexbuf = xtrymalloc (4 + strlen (string) + 1); if (!hexbuf) { err = gpg_error_from_syserror (); goto leave; } strcpy (hexbuf+4, string); for (p=hexbuf+4, len=0; p[0] && p[1]; p += 2) ((unsigned char*)hexbuf)[4+len++] = xtoi_2 (p); if (len > 125) { err = gpg_error (GPG_ERR_TOO_LARGE); xfree (hexbuf); goto leave; } hexbuf[0] = 0x30; /* Tag for a Sequence. */ hexbuf[1] = len+2; hexbuf[2] = 0x80; /* Context tag for an implicit Octet string. */ hexbuf[3] = len; err = ksba_certreq_add_extension (cr, oidstr_authorityKeyIdentifier, 0, hexbuf, 4+len); xfree (hexbuf); if (err) { log_error ("error setting the AKI: %s\n", gpg_strerror (err)); goto leave; } } else if (publicpkalgo == GCRY_PK_EDDSA || publicpkalgo == GCRY_PK_ECC) { /* For EdDSA and ECC we add the public key as default identifier. */ const unsigned char *q; size_t qlen, derlen; unsigned char *der; err = get_ecc_q_from_canon_sexp (public, publiclen, &q, &qlen); if (err) { log_error ("error getting Q from public key: %s\n", gpg_strerror (err)); goto leave; } if (publicpkalgo == GCRY_PK_EDDSA && qlen>32 && (qlen&1) && *q==0x40) { /* Skip our optional native encoding octet. */ q++; qlen--; } /* FIXME: For plain ECC we should better use a compressed * point. That requires an updated Libgcrypt. Without that * using nistp521 won't work due to the length check below. */ if (qlen > 125) { err = gpg_error (GPG_ERR_TOO_LARGE); goto leave; } derlen = 4 + qlen; der = xtrymalloc (derlen); if (!der) { err = gpg_error_from_syserror (); goto leave; } der[0] = 0x30; /* Sequence */ der[1] = qlen + 2; der[2] = 0x80; /* Context tag for an implict Octet String. */ der[3] = qlen; memcpy (der+4, q, qlen); err = ksba_certreq_add_extension (cr, oidstr_authorityKeyIdentifier, 0, der, derlen); xfree (der); if (err) { log_error ("error setting the AKI: %s\n", gpg_strerror (err)); goto leave; } } /* Insert the SubjectKeyId. */ string = get_parameter_value (para, pSUBJKEYID, 0); if (string && !strcmp (string, "none")) ; /* Do not issue an SKI. */ else if (string) { char *hexbuf; /* Allocate a buffer for in-place conversion. We also add 2 extra bytes space for the tag and length field. */ hexbuf = xtrymalloc (2 + strlen (string) + 1); if (!hexbuf) { err = gpg_error_from_syserror (); goto leave; } strcpy (hexbuf+2, string); for (p=hexbuf+2, len=0; p[0] && p[1]; p += 2) ((unsigned char*)hexbuf)[2+len++] = xtoi_2 (p); if (len > 127) { err = gpg_error (GPG_ERR_TOO_LARGE); xfree (hexbuf); goto leave; } hexbuf[0] = 0x04; /* Tag for an Octet string. */ hexbuf[1] = len; err = ksba_certreq_add_extension (cr, oidstr_subjectKeyIdentifier, 0, hexbuf, 2+len); xfree (hexbuf); if (err) { log_error ("error setting SKI: %s\n", gpg_strerror (err)); goto leave; } } else if (sigkeypkalgo == GCRY_PK_EDDSA || sigkeypkalgo == GCRY_PK_ECC) { /* For EdDSA and ECC we add the public key as default identifier. */ const unsigned char *q; size_t qlen, derlen; unsigned char *der; /* FIXME: This assumes that the to-be-certified key uses the * same algorithm as the certification key - this is not * always the case; in fact it is common that they * differ. */ err = get_ecc_q_from_canon_sexp (sigkey, sigkeylen, &q, &qlen); if (err) { log_error ("error getting Q from signature key: %s\n", gpg_strerror (err)); goto leave; } if (sigkeypkalgo == GCRY_PK_EDDSA && qlen>32 && (qlen&1) && *q==0x40) { /* Skip our optional native encoding octet. */ q++; qlen--; } if (qlen > 127) { err = gpg_error (GPG_ERR_TOO_LARGE); goto leave; } derlen = 2 + qlen; der = xtrymalloc (derlen); if (!der) { err = gpg_error_from_syserror (); goto leave; } der[0] = 0x04; /* Octet String */ der[1] = qlen; memcpy (der+2, q, qlen); err = ksba_certreq_add_extension (cr, oidstr_subjectKeyIdentifier, 0, der, derlen); xfree (der); if (err) { log_error ("error setting the SKI: %s\n", gpg_strerror (err)); goto leave; } } /* Insert additional extensions. */ for (seq=0; (string = get_parameter_value (para, pEXTENSION, seq)); seq++) { char *hexbuf; char *oidstr; int crit = 0; s = strpbrk (string, " \t:"); if (!s) { err = gpg_error (GPG_ERR_INTERNAL); goto leave; } oidstr = xtrymalloc (s - string + 1); if (!oidstr) { err = gpg_error_from_syserror (); goto leave; } memcpy (oidstr, string, (s-string)); oidstr[(s-string)] = 0; s++; while (spacep (s)) s++; if (!*s) { err = gpg_error (GPG_ERR_INTERNAL); xfree (oidstr); goto leave; } if (strchr ("cC", *s)) crit = 1; s++; while (spacep (s)) s++; if (*s == ':') s++; while (spacep (s)) s++; hexbuf = xtrystrdup (s); if (!hexbuf) { err = gpg_error_from_syserror (); xfree (oidstr); goto leave; } for (p=hexbuf, len=0; p[0] && p[1]; p += 2) ((unsigned char*)hexbuf)[len++] = xtoi_2 (p); err = ksba_certreq_add_extension (cr, oidstr, crit, hexbuf, len); xfree (oidstr); xfree (hexbuf); } } else { sigkey = public; sigkeylen = publiclen; sigkeypkalgo = publicpkalgo; } do { err = ksba_certreq_build (cr, &stopreason); if (err) { log_error ("ksba_certreq_build failed: %s\n", gpg_strerror (err)); rc = err; goto leave; } if (stopreason == KSBA_SR_NEED_SIG) { gcry_sexp_t s_pkey; unsigned char grip[20]; char hexgrip[41]; unsigned char *sigval, *newsigval; size_t siglen; void *tbsdata; size_t tbsdatalen; rc = gcry_sexp_sscan (&s_pkey, NULL, (const char*)sigkey, sigkeylen); if (rc) { log_error ("gcry_sexp_scan failed: %s\n", gpg_strerror (rc)); goto leave; } if ( !gcry_pk_get_keygrip (s_pkey, grip) ) { rc = gpg_error (GPG_ERR_GENERAL); log_error ("can't figure out the keygrip\n"); gcry_sexp_release (s_pkey); goto leave; } gcry_sexp_release (s_pkey); bin2hex (grip, 20, hexgrip); if (!opt.quiet) log_info ("about to sign the %s for key: &%s\n", certmode? "certificate":"CSR", hexgrip); if (carddirect && !certmode) { if (tbsmb) { tbsdata = get_membuf (tbsmb, &tbsdatalen); tbsmb = NULL; if (!tbsdata) rc = gpg_error_from_syserror (); else rc = gpgsm_scd_pksign (ctrl, carddirect, NULL, tbsdata, tbsdatalen, 0, &sigval, &siglen); xfree (tbsdata); } else rc = gpgsm_scd_pksign (ctrl, carddirect, NULL, gcry_md_read (md, mdalgo), gcry_md_get_algo_dlen (mdalgo), mdalgo, &sigval, &siglen); } else { char *orig_codeset; char *desc; orig_codeset = i18n_switchto_utf8 (); desc = percent_plus_escape (_("To complete this certificate request please enter" " the passphrase for the key you just created once" " more.\n")); i18n_switchback (orig_codeset); if (tbsmb) { tbsdata = get_membuf (tbsmb, &tbsdatalen); tbsmb = NULL; if (!tbsdata) rc = gpg_error_from_syserror (); else rc = gpgsm_agent_pksign (ctrl, hexgrip, desc, tbsdata, tbsdatalen, 0, &sigval, &siglen); xfree (tbsdata); } else rc = gpgsm_agent_pksign (ctrl, hexgrip, desc, gcry_md_read(md, mdalgo), gcry_md_get_algo_dlen (mdalgo), mdalgo, &sigval, &siglen); xfree (desc); } if (rc) { log_error ("signing failed: %s\n", gpg_strerror (rc)); goto leave; } err = transform_sigval (sigval, siglen, mdalgo, &newsigval, NULL); xfree (sigval); if (!err) { err = ksba_certreq_set_sig_val (cr, newsigval); xfree (newsigval); } if (err) { log_error ("failed to store the sig_val: %s\n", gpg_strerror (err)); rc = err; goto leave; } } } while (stopreason != KSBA_SR_READY); leave: if (tbsmb) xfree (get_membuf (tbsmb, NULL)); gcry_md_close (md); ksba_certreq_release (cr); return rc; } /* Create a new key by reading the parameters from IN_FP. Multiple keys may be created */ int gpgsm_genkey (ctrl_t ctrl, estream_t in_stream, estream_t out_stream) { int rc; rc = read_parameters (ctrl, in_stream, out_stream); if (rc) { log_error ("error creating certificate request: %s <%s>\n", gpg_strerror (rc), gpg_strsource (rc)); goto leave; } leave: return rc; }