/* certreq.c - create pkcs-10 messages
* Copyright (C) 2002, 2011, 2012 g10 Code GmbH
*
* This file is part of KSBA.
*
* KSBA is free software; you can redistribute it and/or modify
* it under the terms of either
*
* - the GNU Lesser General Public License as published by the Free
* Software Foundation; either version 3 of the License, or (at
* your option) any later version.
*
* or
*
* - the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* or both in parallel, as here.
*
* KSBA 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 copies of the GNU General Public License
* and the GNU Lesser General Public License along with this program;
* if not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include "util.h"
#include "cms.h"
#include "convert.h"
#include "keyinfo.h"
#include "der-encoder.h"
#include "ber-help.h"
#include "certreq.h"
static const char oidstr_subjectAltName[] = "2.5.29.17";
static const char oidstr_extensionReq[] = "1.2.840.113549.1.9.14";
/**
* ksba_cms_new:
*
* Create a new and empty CMS object
*
* Return value: A CMS object or an error code.
**/
gpg_error_t
ksba_certreq_new (ksba_certreq_t *r_cr)
{
*r_cr = xtrycalloc (1, sizeof **r_cr);
if (!*r_cr)
return gpg_error_from_errno (errno);
return 0;
}
/**
* ksba_certreq_release:
* @cms: A Certreq object
*
* Release a Certreq object.
**/
void
ksba_certreq_release (ksba_certreq_t cr)
{
if (!cr)
return;
xfree (cr->x509.serial.der);
xfree (cr->x509.issuer.der);
xfree (cr->x509.siginfo.der);
xfree (cr->subject.der);
xfree (cr->key.der);
xfree (cr->cri.der);
xfree (cr->sig_val.algo);
xfree (cr->sig_val.value);
while (cr->subject_alt_names)
{
struct general_names_s *tmp = cr->subject_alt_names->next;
xfree (cr->subject_alt_names);
cr->subject_alt_names = tmp;
}
while (cr->extn_list)
{
struct extn_list_s *e = cr->extn_list->next;
xfree (cr->extn_list);
cr->extn_list = e;
}
xfree (cr);
}
gpg_error_t
ksba_certreq_set_writer (ksba_certreq_t cr, ksba_writer_t w)
{
if (!cr || !w)
return gpg_error (GPG_ERR_INV_VALUE);
cr->writer = w;
return 0;
}
/* Provide a hash function so that we are able to hash the data */
void
ksba_certreq_set_hash_function (ksba_certreq_t cr,
void (*hash_fnc)(void *, const void *, size_t),
void *hash_fnc_arg)
{
if (cr)
{
cr->hash_fnc = hash_fnc;
cr->hash_fnc_arg = hash_fnc_arg;
}
}
/* Store the serial number. If this function is used, a real X.509
certificate will be built instead of a pkcs#10 certificate signing
request. SN must be a simple canonical encoded s-expression with
the serial number as its only item. Note that this function allows
to set a negative serial number, which is not forbidden but
probably not a good idea. */
gpg_error_t
ksba_certreq_set_serial (ksba_certreq_t cr, ksba_const_sexp_t sn)
{
const char *p = (const char *)sn;
unsigned long n;
char *endp;
if (!cr || !sn || !p || *p != '(')
return gpg_error (GPG_ERR_INV_VALUE);
p++;
n = strtoul (p, &endp, 10);
p = endp;
if (*p++ != ':' || !n)
return gpg_error (GPG_ERR_INV_VALUE);
/* Remove invalid leading zero bytes. */
for (; n > 1 && !*p && !(p[1] & 0x80); n--, p++)
;
if (cr->x509.serial.der)
return gpg_error (GPG_ERR_CONFLICT); /* Already set */
cr->x509.serial.der = xtrymalloc (n);
if (!cr->x509.serial.der)
return gpg_error_from_syserror ();
memcpy (cr->x509.serial.der, p, n);
cr->x509.serial.derlen = n;
return 0;
}
/* Store the issuer's name. NAME must be a valid RFC-2253 encoded DN
name. Only used for building an X.509 certificate. */
gpg_error_t
ksba_certreq_set_issuer (ksba_certreq_t cr, const char *name)
{
if (!cr || !name)
return gpg_error (GPG_ERR_INV_VALUE);
if (cr->x509.issuer.der)
return gpg_error (GPG_ERR_CONFLICT); /* Already set */
return _ksba_dn_from_str (name, &cr->x509.issuer.der,
&cr->x509.issuer.derlen);
}
/* Store validity information. The time is in TIMEBUF. A value of 0
for WHAT stores the notBefore time, a value of 1 stores the
notAfter time. Only used for building an X.509 certificate. */
gpg_error_t
ksba_certreq_set_validity (ksba_certreq_t cr, int what,
const ksba_isotime_t timebuf)
{
if (!cr || what < 0 || what > 1
|| !timebuf || _ksba_assert_time_format (timebuf))
return gpg_error (GPG_ERR_INV_VALUE);
_ksba_copy_time (what?cr->x509.not_after:cr->x509.not_before, timebuf);
return 0;
}
/* Store the signing key info. This is used to extract the signing
algorithm; the signing itself needs to be done by the caller as
response to a stop code. The expression SIGINFO is similar to a
sig-val one, however most parameters are not required. The
expected structure of this canonical encoded s-expression is:
(sig-val
(<algo>
(<param_name1> <value>)
...
(<param_namen> <value>)))
*/
gpg_error_t
ksba_certreq_set_siginfo (ksba_certreq_t cr, ksba_const_sexp_t siginfo)
{
if (!cr || !siginfo)
return gpg_error (GPG_ERR_INV_VALUE);
xfree (cr->x509.siginfo.der);
cr->x509.siginfo.der = NULL;
return _ksba_algoinfo_from_sexp (siginfo, &cr->x509.siginfo.der,
&cr->x509.siginfo.derlen);
}
/* Store the subject's name. Does perform some syntactic checks on
the name. The first added subject is the real one, all subsequent
calls add subjectAltNames.
NAME must be a valid RFC-2253 encoded DN name for the first one or an
email address enclosed in angle brackets for all further calls.
*/
gpg_error_t
ksba_certreq_add_subject (ksba_certreq_t cr, const char *name)
{
unsigned long namelen;
size_t n, n1;
struct general_names_s *gn;
unsigned char *der;
int tag;
const char *endp;
if (!cr || !name)
return gpg_error (GPG_ERR_INV_VALUE);
if (!cr->subject.der)
return _ksba_dn_from_str (name, &cr->subject.der, &cr->subject.derlen);
/* This is assumed to be an subjectAltName. */
/* Note that the way we pass the name should match what
ksba_cert_get_subject() returns. In particular we expect that it
is a real string and thus a canonical S-expression is
additionally terminated by a 0. */
namelen = strlen (name);
if (*name == '<' && name[namelen-1] == '>'
&& namelen >= 4 && strchr (name, '@'))
{
name++;
namelen -= 2;
tag = 1; /* rfc822Name */
}
else if (!strncmp (name, "(8:dns-name", 11))
{
tag = 2; /* dNSName */
namelen = strtoul (name+11, (char**)&endp, 10);
name = endp;
if (!namelen || *name != ':')
return gpg_error (GPG_ERR_INV_SEXP);
name++;
}
else if (!strncmp (name, "(3:uri", 6))
{
tag = 6; /* uRI */
namelen = strtoul (name+6, (char**)&endp, 10);
name = endp;
if (!namelen || *name != ':')
return gpg_error (GPG_ERR_INV_SEXP);
name++;
}
else
return gpg_error (GPG_ERR_INV_VALUE);
n1 = _ksba_ber_count_tl (tag, CLASS_CONTEXT, 0, namelen);
n1 += namelen;
gn = xtrymalloc (sizeof *gn + n1 - 1);
if (!gn)
return gpg_error_from_errno (errno);
gn->tag = tag;
gn->datalen = n1;
der = (unsigned char *)gn->data;
n = _ksba_ber_encode_tl (der, tag, CLASS_CONTEXT, 0, namelen);
if (!n)
return gpg_error (GPG_ERR_BUG);
der += n;
memcpy (der, name, namelen);
assert (der + namelen - (unsigned char*)gn->data == n1);
gn->next = cr->subject_alt_names;
cr->subject_alt_names = gn;
return 0;
}
/* Add the GeneralNames object GNAMES to the list of extensions in CR.
Use OID as object identifier for the extensions. */
static gpg_error_t
add_general_names_to_extn (ksba_certreq_t cr, struct general_names_s *gnames,
const char *oid)
{
struct general_names_s *g;
size_t n, n1, n2;
struct extn_list_s *e;
unsigned char *der;
/* Calculate the required size. */
n1 = 0;
for (g=gnames; g; g = g->next)
n1 += g->datalen;
n2 = _ksba_ber_count_tl (TYPE_SEQUENCE, CLASS_UNIVERSAL, 1, n1);
n2 += n1;
/* Allocate memory and encode all. */
e = xtrymalloc (sizeof *e + n2 - 1);
if (!e)
return gpg_error_from_errno (errno);
e->oid = oid;
e->critical = 0;
e->derlen = n2;
der = e->der;
n = _ksba_ber_encode_tl (der, TYPE_SEQUENCE, CLASS_UNIVERSAL, 1, n1);
if (!n)
return gpg_error (GPG_ERR_BUG); /* (no need to cleanup after a bug) */
der += n;
for (g=gnames; g; g = g->next)
{
memcpy (der, g->data, g->datalen);
der += g->datalen;
}
assert (der - e->der == n2);
e->next = cr->extn_list;
cr->extn_list = e;
return 0;
}
/* Store the subject's publickey. */
gpg_error_t
ksba_certreq_set_public_key (ksba_certreq_t cr, ksba_const_sexp_t key)
{
if (!cr)
return gpg_error (GPG_ERR_INV_VALUE);
xfree (cr->key.der);
cr->key.der = NULL;
return _ksba_keyinfo_from_sexp (key, &cr->key.der, &cr->key.derlen);
}
/* Generic function to add an extension to a certificate request. The
extension must be provided readily encoded in the buffer DER of
length DERLEN bytes; the OID is to be given in OID and IS_CRIT
should be set to true if that extension shall be marked
critical. */
gpg_error_t
ksba_certreq_add_extension (ksba_certreq_t cr,
const char *oid, int is_crit,
const void *der, size_t derlen)
{
size_t oidlen;
struct extn_list_s *e;
if (!cr || !oid|| !*oid || !der || !derlen)
return gpg_error (GPG_ERR_INV_VALUE);
oidlen = strlen (oid);
e = xtrymalloc (sizeof *e + derlen + oidlen);
if (!e)
return gpg_error_from_errno (errno);
e->critical = is_crit;
e->derlen = derlen;
memcpy (e->der, der, derlen);
strcpy (e->der+derlen, oid);
e->oid = e->der + derlen;
e->next = cr->extn_list;
cr->extn_list = e;
return 0;
}
/*
* r_sig = (sig-val
* (<algo>
* (<param_name1> <mpi>)
* ...
* (<param_namen> <mpi>)
* ))
* The sexp must be in canonical form.
* Fixme: The code is mostly duplicated from cms.c
* Note, that <algo> must be given as a stringified OID or the special
* string "rsa" which is translated to sha1WithRSAEncryption
*/
gpg_error_t
ksba_certreq_set_sig_val (ksba_certreq_t cr, ksba_const_sexp_t sigval)
{
const char *s, *endp;
unsigned long n;
if (!cr)
return gpg_error (GPG_ERR_INV_VALUE);
s = sigval;
if (*s != '(')
return gpg_error (GPG_ERR_INV_SEXP);
s++;
n = strtoul (s, (char**)&endp, 10);
s = endp;
if (!n || *s!=':')
return gpg_error (GPG_ERR_INV_SEXP); /* we don't allow empty lengths */
s++;
if (n != 7 || memcmp (s, "sig-val", 7))
return gpg_error (GPG_ERR_UNKNOWN_SEXP);
s += 7;
if (*s != '(')
return gpg_error (digitp (s)? GPG_ERR_UNKNOWN_SEXP : GPG_ERR_INV_SEXP);
s++;
/* break out the algorithm ID */
n = strtoul (s, (char**)&endp, 10);
s = endp;
if (!n || *s != ':')
return gpg_error (GPG_ERR_INV_SEXP); /* we don't allow empty lengths */
s++;
xfree (cr->sig_val.algo);
if (n==3 && s[0] == 'r' && s[1] == 's' && s[2] == 'a')
{ /* kludge to allow "rsa" to be passed as algorithm name */
cr->sig_val.algo = xtrystrdup ("1.2.840.113549.1.1.5");
if (!cr->sig_val.algo)
return gpg_error (GPG_ERR_ENOMEM);
}
else
{
cr->sig_val.algo = xtrymalloc (n+1);
if (!cr->sig_val.algo)
return gpg_error (GPG_ERR_ENOMEM);
memcpy (cr->sig_val.algo, s, n);
cr->sig_val.algo[n] = 0;
}
s += n;
/* And now the values - FIXME: For now we only support one */
/* fixme: start loop */
if (*s != '(')
return gpg_error (digitp (s)? GPG_ERR_UNKNOWN_SEXP : GPG_ERR_INV_SEXP);
s++;
n = strtoul (s, (char**)&endp, 10);
s = endp;
if (!n || *s != ':')
return gpg_error (GPG_ERR_INV_SEXP);
s++;
s += n; /* ignore the name of the parameter */
if (!digitp(s))
return gpg_error (GPG_ERR_UNKNOWN_SEXP); /* but may also be an invalid one */
n = strtoul (s, (char**)&endp, 10);
s = endp;
if (!n || *s != ':')
return gpg_error (GPG_ERR_INV_SEXP);
s++;
if (n > 1 && !*s)
{ /* We might have a leading zero due to the way we encode
MPIs - this zero should not go into the BIT STRING. */
s++;
n--;
}
xfree (cr->sig_val.value);
cr->sig_val.value = xtrymalloc (n);
if (!cr->sig_val.value)
return gpg_error (GPG_ERR_ENOMEM);
memcpy (cr->sig_val.value, s, n);
cr->sig_val.valuelen = n;
s += n;
if ( *s != ')')
return gpg_error (GPG_ERR_UNKNOWN_SEXP); /* but may also be an invalid one */
s++;
/* fixme: end loop over parameters */
/* we need 2 closing parenthesis */
if ( *s != ')' || s[1] != ')')
return gpg_error (GPG_ERR_INV_SEXP);
return 0;
}
/* Build the extension block and return it in R_DER and R_DERLEN. IF
CERTMODE is true build X.509 certificate extension instead. */
static gpg_error_t
build_extensions (ksba_certreq_t cr, int certmode,
void **r_der, size_t *r_derlen)
{
gpg_error_t err;
ksba_writer_t writer, w=NULL;
struct extn_list_s *e;
unsigned char *value = NULL;
size_t valuelen;
unsigned char *p;
size_t n;
*r_der = NULL;
*r_derlen = 0;
err = ksba_writer_new (&writer);
if (err)
goto leave;
err = ksba_writer_set_mem (writer, 2048);
if (err)
goto leave;
err = ksba_writer_new (&w);
if (err)
goto leave;
for (e=cr->extn_list; e; e = e->next)
{
err = ksba_writer_set_mem (w, e->derlen + 100);
if (err)
goto leave;
err = ksba_oid_from_str (e->oid, &p, &n);
if(err)
goto leave;
err = _ksba_ber_write_tl (w, TYPE_OBJECT_ID, CLASS_UNIVERSAL, 0, n);
if (!err)
err = ksba_writer_write (w, p, n);
xfree (p);
if (e->critical)
{
err = _ksba_ber_write_tl (w, TYPE_BOOLEAN, CLASS_UNIVERSAL, 0, 1);
if (!err)
err = ksba_writer_write (w, "\xff", 1);
if(err)
goto leave;
}
err = _ksba_ber_write_tl (w, TYPE_OCTET_STRING, CLASS_UNIVERSAL,
0, e->derlen);
if (!err)
err = ksba_writer_write (w, e->der, e->derlen);
if(err)
goto leave;
p = ksba_writer_snatch_mem (w, &n);
if (!p)
{
err = gpg_error (GPG_ERR_ENOMEM);
goto leave;
}
err = _ksba_ber_write_tl (writer, TYPE_SEQUENCE, CLASS_UNIVERSAL,
1, n);
if (!err)
err = ksba_writer_write (writer, p, n);
xfree (p); p = NULL;
if (err)
goto leave;
}
/* Embed all the sequences into another sequence */
value = ksba_writer_snatch_mem (writer, &valuelen);
if (!value)
{
err = gpg_error (GPG_ERR_ENOMEM);
goto leave;
}
err = ksba_writer_set_mem (writer, valuelen+10);
if (err)
goto leave;
err = _ksba_ber_write_tl (writer, TYPE_SEQUENCE, CLASS_UNIVERSAL,
1, valuelen);
if (!err)
err = ksba_writer_write (writer, value, valuelen);
if (err)
goto leave;
xfree (value);
value = ksba_writer_snatch_mem (writer, &valuelen);
if (!value)
{
err = gpg_error (GPG_ERR_ENOMEM);
goto leave;
}
if (!certmode)
{
/* Now create the extension request sequence content */
err = ksba_writer_set_mem (writer, valuelen+100);
if (err)
goto leave;
err = ksba_oid_from_str (oidstr_extensionReq, &p, &n);
if(err)
goto leave;
err = _ksba_ber_write_tl (writer, TYPE_OBJECT_ID, CLASS_UNIVERSAL, 0, n);
if (!err)
err = ksba_writer_write (writer, p, n);
xfree (p); p = NULL;
if (err)
return err;
err = _ksba_ber_write_tl (writer, TYPE_SET, CLASS_UNIVERSAL, 1, valuelen);
if (!err)
err = ksba_writer_write (writer, value, valuelen);
/* Put this all into a SEQUENCE */
xfree (value);
value = ksba_writer_snatch_mem (writer, &valuelen);
if (!value)
{
err = gpg_error (GPG_ERR_ENOMEM);
goto leave;
}
err = ksba_writer_set_mem (writer, valuelen+10);
if (err)
goto leave;
err = _ksba_ber_write_tl (writer, TYPE_SEQUENCE, CLASS_UNIVERSAL,
1, valuelen);
if (!err)
err = ksba_writer_write (writer, value, valuelen);
if (err)
goto leave;
xfree (value);
value = ksba_writer_snatch_mem (writer, &valuelen);
if (!value)
{
err = gpg_error (GPG_ERR_ENOMEM);
goto leave;
}
}
*r_der = value;
*r_derlen = valuelen;
value = NULL;
leave:
ksba_writer_release (writer);
ksba_writer_release (w);
xfree (value);
return err;
}
/* Build a value tree from the already stored values. */
static gpg_error_t
build_cri (ksba_certreq_t cr)
{
gpg_error_t err;
ksba_writer_t writer;
void *value = NULL;
size_t valuelen;
int certmode;
/* If a serial number has been set, we don't create a CSR but a
proper certificate. */
certmode = !!cr->x509.serial.der;
err = ksba_writer_new (&writer);
if (err)
goto leave;
err = ksba_writer_set_mem (writer, 2048);
if (err)
goto leave;
if (!cr->key.der)
{
err = gpg_error (GPG_ERR_MISSING_VALUE);
goto leave;
}
/* We write all stuff out to a temporary writer object, then use
this object to create the cri and store the cri image */
if (certmode)
{
/* Store the version structure; version is 3 (encoded as 2):
[0] { INTEGER 2 } */
err = ksba_writer_write (writer, "\xa0\x03\x02\x01\x02", 5);
}
else
{
/* Store version v1 (which is a 0). */
err = _ksba_ber_write_tl (writer, TYPE_INTEGER, CLASS_UNIVERSAL, 0, 1);
if (!err)
err = ksba_writer_write (writer, "", 1);
}
if (err)
goto leave;
/* For a certificate we need to store the s/n, the signature
algorithm identifier, the issuer DN and the validity. */
if (certmode)
{
/* Store the serial number. */
err = _ksba_ber_write_tl (writer, TYPE_INTEGER, CLASS_UNIVERSAL, 0,
cr->x509.serial.derlen);
if (!err)
err = ksba_writer_write (writer,
cr->x509.serial.der, cr->x509.serial.derlen);
if (err)
goto leave;
/* Store the signature algorithm identifier. */
if (!cr->x509.siginfo.der)
err = gpg_error (GPG_ERR_MISSING_VALUE);
else
err = ksba_writer_write (writer,
cr->x509.siginfo.der, cr->x509.siginfo.derlen);
if (err)
goto leave;
/* Store the issuer DN. If no issuer DN has been set we use the
subject DN. */
if (cr->x509.issuer.der)
err = ksba_writer_write (writer,
cr->x509.issuer.der, cr->x509.issuer.derlen);
else if (cr->subject.der)
err = ksba_writer_write (writer, cr->subject.der, cr->subject.derlen);
else
err = gpg_error (GPG_ERR_MISSING_VALUE);
if (err)
goto leave;
/* Store the Validity. */
{
unsigned char templ[36];
unsigned char *tp;
tp = templ;
*tp++ = 0x30;
*tp++ = 0x22;
*tp++ = TYPE_GENERALIZED_TIME;
*tp++ = 15;
if (cr->x509.not_before[0])
{
if (_ksba_cmp_time (cr->x509.not_before, "20500101T000000") >= 0)
{
memcpy (tp, cr->x509.not_before, 8);
tp += 8;
memcpy (tp, cr->x509.not_before+9, 6);
tp += 6;
}
else
{
tp[-2] = TYPE_UTC_TIME;
tp[-1] = 13;
memcpy (tp, cr->x509.not_before+2, 6);
tp += 6;
memcpy (tp, cr->x509.not_before+9, 6);
tp += 6;
}
}
else
{
tp[-2] = TYPE_UTC_TIME;
tp[-1] = 13;
memcpy (tp, "110101000000", 12);
tp += 12;
}
*tp++ = 'Z';
*tp++ = TYPE_GENERALIZED_TIME;
*tp++ = 15;
if (cr->x509.not_after[0])
{
if (_ksba_cmp_time (cr->x509.not_after, "20500101T000000") >= 0)
{
memcpy (tp, cr->x509.not_after, 8);
tp += 8;
memcpy (tp, cr->x509.not_after+9, 6);
tp += 6;
}
else
{
tp[-2] = TYPE_UTC_TIME;
tp[-1] = 13;
memcpy (tp, cr->x509.not_after+2, 6);
tp += 6;
memcpy (tp, cr->x509.not_after+9, 6);
tp += 6;
}
}
else
{
memcpy (tp,"20630405170000", 14);
tp += 14;
}
*tp++ = 'Z';
assert (tp - templ <= 36);
templ[1] = tp - templ - 2; /* Fixup the sequence length. */
err = ksba_writer_write (writer, templ, tp - templ);
if (err)
goto leave;
}
}
/* store the subject */
if (!cr->subject.der)
{
err = gpg_error (GPG_ERR_MISSING_VALUE);
goto leave;
}
err = ksba_writer_write (writer, cr->subject.der, cr->subject.derlen);
if (err)
goto leave;
/* store the public key info */
err = ksba_writer_write (writer, cr->key.der, cr->key.derlen);
if (err)
goto leave;
/* Copy generalNames objects to the extension list. */
if (cr->subject_alt_names)
{
err = add_general_names_to_extn (cr, cr->subject_alt_names,
oidstr_subjectAltName);
if (err)
goto leave;
while (cr->subject_alt_names)
{
struct general_names_s *tmp = cr->subject_alt_names->next;
xfree (cr->subject_alt_names);
cr->subject_alt_names = tmp;
}
cr->subject_alt_names = NULL;
}
/* Write the extensions. Note that the implicit SET OF is REQUIRED */
xfree (value); value = NULL;
valuelen = 0;
if (cr->extn_list)
{
err = build_extensions (cr, certmode, &value, &valuelen);
if (err)
goto leave;
err = _ksba_ber_write_tl (writer, certmode? 3:0,
CLASS_CONTEXT, 1, valuelen);
if (!err)
err = ksba_writer_write (writer, value, valuelen);
if (err)
goto leave;
}
else
{ /* We can't write an object of length zero using our ber_write
function. So we must open encode it. */
err = ksba_writer_write (writer,
certmode? "\xa3\x02\x30":"\xa0\x02\x30", 4);
if (err)
goto leave;
}
/* pack it into the sequence */
xfree (value);
value = ksba_writer_snatch_mem (writer, &valuelen);
if (!value)
{
err = gpg_error (GPG_ERR_ENOMEM);
goto leave;
}
/* reinitialize the buffer to create the outer sequence */
err = ksba_writer_set_mem (writer, valuelen+10);
if (err)
goto leave;
/* write outer sequence */
err = _ksba_ber_write_tl (writer, TYPE_SEQUENCE, CLASS_UNIVERSAL,
1, valuelen);
if (!err)
err = ksba_writer_write (writer, value, valuelen);
if (err)
goto leave;
/* and store the final result */
cr->cri.der = ksba_writer_snatch_mem (writer, &cr->cri.derlen);
if (!cr->cri.der)
err = gpg_error (GPG_ERR_ENOMEM);
leave:
ksba_writer_release (writer);
xfree (value);
return err;
}
static gpg_error_t
hash_cri (ksba_certreq_t cr)
{
if (!cr->hash_fnc)
return gpg_error (GPG_ERR_MISSING_ACTION);
if (!cr->cri.der)
return gpg_error (GPG_ERR_INV_STATE);
cr->hash_fnc (cr->hash_fnc_arg, cr->cri.der, cr->cri.derlen);
return 0;
}
/* The user has calculated the signatures and we can now write
the signature */
static gpg_error_t
sign_and_write (ksba_certreq_t cr)
{
gpg_error_t err;
ksba_writer_t writer;
void *value = NULL;
size_t valuelen;
err = ksba_writer_new (&writer);
if (err)
goto leave;
err = ksba_writer_set_mem (writer, 2048);
if (err)
goto leave;
/* store the cri */
if (!cr->cri.der)
{
err = gpg_error (GPG_ERR_MISSING_VALUE);
goto leave;
}
err = ksba_writer_write (writer, cr->cri.der, cr->cri.derlen);
if (err)
goto leave;
/* store the signatureAlgorithm */
if (!cr->sig_val.algo)
return gpg_error (GPG_ERR_MISSING_VALUE);
err = _ksba_der_write_algorithm_identifier (writer,
cr->sig_val.algo, NULL, 0);
if (err)
goto leave;
/* write the signature */
err = _ksba_ber_write_tl (writer, TYPE_BIT_STRING, CLASS_UNIVERSAL, 0,
1 + cr->sig_val.valuelen);
if (!err)
err = ksba_writer_write (writer, "", 1);
if (!err)
err = ksba_writer_write (writer, cr->sig_val.value, cr->sig_val.valuelen);
if (err)
goto leave;
/* pack it into the outer sequence */
value = ksba_writer_snatch_mem (writer, &valuelen);
if (!value)
{
err = gpg_error (GPG_ERR_ENOMEM);
goto leave;
}
err = ksba_writer_set_mem (writer, valuelen+10);
if (err)
goto leave;
/* write outer sequence */
err = _ksba_ber_write_tl (writer, TYPE_SEQUENCE, CLASS_UNIVERSAL,
1, valuelen);
if (!err)
err = ksba_writer_write (writer, value, valuelen);
if (err)
goto leave;
/* and finally write the result */
xfree (value);
value = ksba_writer_snatch_mem (writer, &valuelen);
if (!value)
err = gpg_error (GPG_ERR_ENOMEM);
else if (!cr->writer)
err = gpg_error (GPG_ERR_MISSING_ACTION);
else
err = ksba_writer_write (cr->writer, value, valuelen);
leave:
ksba_writer_release (writer);
xfree (value);
return err;
}
/* The main function to build a certificate request. It used used in
a loop so allow for interaction between the function and the caller */
gpg_error_t
ksba_certreq_build (ksba_certreq_t cr, ksba_stop_reason_t *r_stopreason)
{
enum {
sSTART,
sHASHING,
sGOTSIG,
sERROR
} state = sERROR;
gpg_error_t err = 0;
ksba_stop_reason_t stop_reason;
if (!cr || !r_stopreason)
return gpg_error (GPG_ERR_INV_VALUE);
if (!cr->any_build_done)
{ /* first time initialization of the stop reason */
*r_stopreason = 0;
cr->any_build_done = 1;
}
/* Calculate state from last reason */
stop_reason = *r_stopreason;
*r_stopreason = KSBA_SR_RUNNING;
switch (stop_reason)
{
case 0:
state = sSTART;
break;
case KSBA_SR_NEED_HASH:
state = sHASHING;
break;
case KSBA_SR_NEED_SIG:
if (!cr->sig_val.algo)
err = gpg_error (GPG_ERR_MISSING_ACTION);
else
state = sGOTSIG;
break;
case KSBA_SR_RUNNING:
err = gpg_error (GPG_ERR_INV_STATE);
break;
default:
err = gpg_error (GPG_ERR_BUG);
break;
}
if (err)
return err;
/* Do the action */
switch (state)
{
case sSTART:
err = build_cri (cr);
break;
case sHASHING:
err = hash_cri (cr);
break;
case sGOTSIG:
err = sign_and_write (cr);
break;
default:
err = gpg_error (GPG_ERR_INV_STATE);
break;
}
if (err)
return err;
/* Calculate new stop reason */
switch (state)
{
case sSTART:
stop_reason = KSBA_SR_NEED_HASH; /* caller should set the hash function*/
break;
case sHASHING:
stop_reason = KSBA_SR_NEED_SIG;
break;
case sGOTSIG:
stop_reason = KSBA_SR_READY;
break;
default:
break;
}
*r_stopreason = stop_reason;
return 0;
}