--- /dev/null
+/* asn_mime.c */
+/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
+ * project.
+ */
+/* ====================================================================
+ * Copyright (c) 1999-2008 The OpenSSL Project. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ * software must display the following acknowledgment:
+ * "This product includes software developed by the OpenSSL Project
+ * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ * endorse or promote products derived from this software without
+ * prior written permission. For written permission, please contact
+ * licensing@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ * nor may "OpenSSL" appear in their names without prior written
+ * permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ * acknowledgment:
+ * "This product includes software developed by the OpenSSL Project
+ * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ *
+ */
+
+#include <stdio.h>
+#include <ctype.h>
+#include "cryptlib.h"
+#include <openssl/rand.h>
+#include <openssl/x509.h>
+#include <openssl/asn1.h>
+#include <openssl/asn1t.h>
+#include "asn1_locl.h"
+
+/* Generalised MIME like utilities for streaming ASN1. Although many
+ * have a PKCS7/CMS like flavour others are more general purpose.
+ */
+
+/* MIME format structures
+ * Note that all are translated to lower case apart from
+ * parameter values. Quotes are stripped off
+ */
+
+typedef struct {
+char *param_name; /* Param name e.g. "micalg" */
+char *param_value; /* Param value e.g. "sha1" */
+} MIME_PARAM;
+
+DECLARE_STACK_OF(MIME_PARAM)
+IMPLEMENT_STACK_OF(MIME_PARAM)
+
+typedef struct {
+char *name; /* Name of line e.g. "content-type" */
+char *value; /* Value of line e.g. "text/plain" */
+STACK_OF(MIME_PARAM) *params; /* Zero or more parameters */
+} MIME_HEADER;
+
+DECLARE_STACK_OF(MIME_HEADER)
+IMPLEMENT_STACK_OF(MIME_HEADER)
+
+static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
+ const ASN1_ITEM *it);
+static char * strip_ends(char *name);
+static char * strip_start(char *name);
+static char * strip_end(char *name);
+static MIME_HEADER *mime_hdr_new(char *name, char *value);
+static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value);
+static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio);
+static int mime_hdr_cmp(const MIME_HEADER * const *a,
+ const MIME_HEADER * const *b);
+static int mime_param_cmp(const MIME_PARAM * const *a,
+ const MIME_PARAM * const *b);
+static void mime_param_free(MIME_PARAM *param);
+static int mime_bound_check(char *line, int linelen, char *bound, int blen);
+static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret);
+static int strip_eol(char *linebuf, int *plen);
+static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name);
+static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name);
+static void mime_hdr_free(MIME_HEADER *hdr);
+
+#define MAX_SMLEN 1024
+#define mime_debug(x) /* x */
+
+/* Output an ASN1 structure in BER format streaming if necessary */
+
+int i2d_ASN1_bio_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
+ const ASN1_ITEM *it)
+ {
+ /* If streaming create stream BIO and copy all content through it */
+ if (flags & SMIME_STREAM)
+ {
+ BIO *bio, *tbio;
+ bio = BIO_new_NDEF(out, val, it);
+ if (!bio)
+ {
+ ASN1err(ASN1_F_I2D_ASN1_BIO_STREAM,ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+ SMIME_crlf_copy(in, bio, flags);
+ (void)BIO_flush(bio);
+ /* Free up successive BIOs until we hit the old output BIO */
+ do
+ {
+ tbio = BIO_pop(bio);
+ BIO_free(bio);
+ bio = tbio;
+ } while (bio != out);
+ }
+ /* else just write out ASN1 structure which will have all content
+ * stored internally
+ */
+ else
+ ASN1_item_i2d_bio(it, out, val);
+ return 1;
+ }
+
+/* Base 64 read and write of ASN1 structure */
+
+static int B64_write_ASN1(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
+ const ASN1_ITEM *it)
+ {
+ BIO *b64;
+ int r;
+ b64 = BIO_new(BIO_f_base64());
+ if(!b64)
+ {
+ ASN1err(ASN1_F_B64_WRITE_ASN1,ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+ /* prepend the b64 BIO so all data is base64 encoded.
+ */
+ out = BIO_push(b64, out);
+ r = i2d_ASN1_bio_stream(out, val, in, flags, it);
+ (void)BIO_flush(out);
+ BIO_pop(out);
+ BIO_free(b64);
+ return r;
+ }
+
+/* Streaming ASN1 PEM write */
+
+int PEM_write_bio_ASN1_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
+ const char *hdr,
+ const ASN1_ITEM *it)
+ {
+ int r;
+ BIO_printf(out, "-----BEGIN %s-----\n", hdr);
+ r = B64_write_ASN1(out, val, in, flags, it);
+ BIO_printf(out, "-----END %s-----\n", hdr);
+ return r;
+ }
+
+static ASN1_VALUE *b64_read_asn1(BIO *bio, const ASN1_ITEM *it)
+{
+ BIO *b64;
+ ASN1_VALUE *val;
+ if(!(b64 = BIO_new(BIO_f_base64()))) {
+ ASN1err(ASN1_F_B64_READ_ASN1,ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+ bio = BIO_push(b64, bio);
+ val = ASN1_item_d2i_bio(it, bio, NULL);
+ if(!val)
+ ASN1err(ASN1_F_B64_READ_ASN1,ASN1_R_DECODE_ERROR);
+ (void)BIO_flush(bio);
+ bio = BIO_pop(bio);
+ BIO_free(b64);
+ return val;
+}
+
+/* Generate the MIME "micalg" parameter from RFC3851, RFC4490 */
+
+static int asn1_write_micalg(BIO *out, STACK_OF(X509_ALGOR) *mdalgs)
+ {
+ const EVP_MD *md;
+ int i, have_unknown = 0, write_comma, ret = 0, md_nid;
+ have_unknown = 0;
+ write_comma = 0;
+ for (i = 0; i < sk_X509_ALGOR_num(mdalgs); i++)
+ {
+ if (write_comma)
+ BIO_write(out, ",", 1);
+ write_comma = 1;
+ md_nid = OBJ_obj2nid(sk_X509_ALGOR_value(mdalgs, i)->algorithm);
+ md = EVP_get_digestbynid(md_nid);
+ if (md && md->md_ctrl)
+ {
+ int rv;
+ char *micstr;
+ rv = md->md_ctrl(NULL, EVP_MD_CTRL_MICALG, 0, &micstr);
+ if (rv > 0)
+ {
+ BIO_puts(out, micstr);
+ OPENSSL_free(micstr);
+ continue;
+ }
+ if (rv != -2)
+ goto err;
+ }
+ switch(md_nid)
+ {
+ case NID_sha1:
+ BIO_puts(out, "sha1");
+ break;
+
+ case NID_md5:
+ BIO_puts(out, "md5");
+ break;
+
+ case NID_sha256:
+ BIO_puts(out, "sha-256");
+ break;
+
+ case NID_sha384:
+ BIO_puts(out, "sha-384");
+ break;
+
+ case NID_sha512:
+ BIO_puts(out, "sha-512");
+ break;
+
+ case NID_id_GostR3411_94:
+ BIO_puts(out, "gostr3411-94");
+ goto err;
+ break;
+
+ default:
+ if (have_unknown)
+ write_comma = 0;
+ else
+ {
+ BIO_puts(out, "unknown");
+ have_unknown = 1;
+ }
+ break;
+
+ }
+ }
+
+ ret = 1;
+ err:
+
+ return ret;
+
+ }
+
+/* SMIME sender */
+
+int SMIME_write_ASN1(BIO *bio, ASN1_VALUE *val, BIO *data, int flags,
+ int ctype_nid, int econt_nid,
+ STACK_OF(X509_ALGOR) *mdalgs,
+ const ASN1_ITEM *it)
+{
+ char bound[33], c;
+ int i;
+ const char *mime_prefix, *mime_eol, *cname = "smime.p7m";
+ const char *msg_type=NULL;
+ if (flags & SMIME_OLDMIME)
+ mime_prefix = "application/x-pkcs7-";
+ else
+ mime_prefix = "application/pkcs7-";
+
+ if (flags & SMIME_CRLFEOL)
+ mime_eol = "\r\n";
+ else
+ mime_eol = "\n";
+ if((flags & SMIME_DETACHED) && data) {
+ /* We want multipart/signed */
+ /* Generate a random boundary */
+ RAND_pseudo_bytes((unsigned char *)bound, 32);
+ for(i = 0; i < 32; i++) {
+ c = bound[i] & 0xf;
+ if(c < 10) c += '0';
+ else c += 'A' - 10;
+ bound[i] = c;
+ }
+ bound[32] = 0;
+ BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
+ BIO_printf(bio, "Content-Type: multipart/signed;");
+ BIO_printf(bio, " protocol=\"%ssignature\";", mime_prefix);
+ BIO_puts(bio, " micalg=\"");
+ asn1_write_micalg(bio, mdalgs);
+ BIO_printf(bio, "\"; boundary=\"----%s\"%s%s",
+ bound, mime_eol, mime_eol);
+ BIO_printf(bio, "This is an S/MIME signed message%s%s",
+ mime_eol, mime_eol);
+ /* Now write out the first part */
+ BIO_printf(bio, "------%s%s", bound, mime_eol);
+ if (!asn1_output_data(bio, data, val, flags, it))
+ return 0;
+ BIO_printf(bio, "%s------%s%s", mime_eol, bound, mime_eol);
+
+ /* Headers for signature */
+
+ BIO_printf(bio, "Content-Type: %ssignature;", mime_prefix);
+ BIO_printf(bio, " name=\"smime.p7s\"%s", mime_eol);
+ BIO_printf(bio, "Content-Transfer-Encoding: base64%s",
+ mime_eol);
+ BIO_printf(bio, "Content-Disposition: attachment;");
+ BIO_printf(bio, " filename=\"smime.p7s\"%s%s",
+ mime_eol, mime_eol);
+ B64_write_ASN1(bio, val, NULL, 0, it);
+ BIO_printf(bio,"%s------%s--%s%s", mime_eol, bound,
+ mime_eol, mime_eol);
+ return 1;
+ }
+
+ /* Determine smime-type header */
+
+ if (ctype_nid == NID_pkcs7_enveloped)
+ msg_type = "enveloped-data";
+ else if (ctype_nid == NID_pkcs7_signed)
+ {
+ if (econt_nid == NID_id_smime_ct_receipt)
+ msg_type = "signed-receipt";
+ else if (sk_X509_ALGOR_num(mdalgs) >= 0)
+ msg_type = "signed-data";
+ else
+ msg_type = "certs-only";
+ }
+ else if (ctype_nid == NID_id_smime_ct_compressedData)
+ {
+ msg_type = "compressed-data";
+ cname = "smime.p7z";
+ }
+ /* MIME headers */
+ BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
+ BIO_printf(bio, "Content-Disposition: attachment;");
+ BIO_printf(bio, " filename=\"%s\"%s", cname, mime_eol);
+ BIO_printf(bio, "Content-Type: %smime;", mime_prefix);
+ if (msg_type)
+ BIO_printf(bio, " smime-type=%s;", msg_type);
+ BIO_printf(bio, " name=\"%s\"%s", cname, mime_eol);
+ BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s",
+ mime_eol, mime_eol);
+ if (!B64_write_ASN1(bio, val, data, flags, it))
+ return 0;
+ BIO_printf(bio, "%s", mime_eol);
+ return 1;
+}
+
+/* Handle output of ASN1 data */
+
+
+static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
+ const ASN1_ITEM *it)
+ {
+ BIO *tmpbio;
+ const ASN1_AUX *aux = it->funcs;
+ ASN1_STREAM_ARG sarg;
+ int rv = 1;
+
+ /* If data is not deteched or resigning then the output BIO is
+ * already set up to finalise when it is written through.
+ */
+ if (!(flags & SMIME_DETACHED) || (flags & PKCS7_REUSE_DIGEST))
+ {
+ SMIME_crlf_copy(data, out, flags);
+ return 1;
+ }
+
+ if (!aux || !aux->asn1_cb)
+ {
+ ASN1err(ASN1_F_ASN1_OUTPUT_DATA,
+ ASN1_R_STREAMING_NOT_SUPPORTED);
+ return 0;
+ }
+
+ sarg.out = out;
+ sarg.ndef_bio = NULL;
+ sarg.boundary = NULL;
+
+ /* Let ASN1 code prepend any needed BIOs */
+
+ if (aux->asn1_cb(ASN1_OP_DETACHED_PRE, &val, it, &sarg) <= 0)
+ return 0;
+
+ /* Copy data across, passing through filter BIOs for processing */
+ SMIME_crlf_copy(data, sarg.ndef_bio, flags);
+
+ /* Finalize structure */
+ if (aux->asn1_cb(ASN1_OP_DETACHED_POST, &val, it, &sarg) <= 0)
+ rv = 0;
+
+ /* Now remove any digests prepended to the BIO */
+
+ while (sarg.ndef_bio != out)
+ {
+ tmpbio = BIO_pop(sarg.ndef_bio);
+ BIO_free(sarg.ndef_bio);
+ sarg.ndef_bio = tmpbio;
+ }
+
+ return rv;
+
+ }
+
+/* SMIME reader: handle multipart/signed and opaque signing.
+ * in multipart case the content is placed in a memory BIO
+ * pointed to by "bcont". In opaque this is set to NULL
+ */
+
+ASN1_VALUE *SMIME_read_ASN1(BIO *bio, BIO **bcont, const ASN1_ITEM *it)
+{
+ BIO *asnin;
+ STACK_OF(MIME_HEADER) *headers = NULL;
+ STACK_OF(BIO) *parts = NULL;
+ MIME_HEADER *hdr;
+ MIME_PARAM *prm;
+ ASN1_VALUE *val;
+ int ret;
+
+ if(bcont) *bcont = NULL;
+
+ if (!(headers = mime_parse_hdr(bio))) {
+ ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_MIME_PARSE_ERROR);
+ return NULL;
+ }
+
+ if(!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) {
+ sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
+ ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_CONTENT_TYPE);
+ return NULL;
+ }
+
+ /* Handle multipart/signed */
+
+ if(!strcmp(hdr->value, "multipart/signed")) {
+ /* Split into two parts */
+ prm = mime_param_find(hdr, "boundary");
+ if(!prm || !prm->param_value) {
+ sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
+ ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BOUNDARY);
+ return NULL;
+ }
+ ret = multi_split(bio, prm->param_value, &parts);
+ sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
+ if(!ret || (sk_BIO_num(parts) != 2) ) {
+ ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BODY_FAILURE);
+ sk_BIO_pop_free(parts, BIO_vfree);
+ return NULL;
+ }
+
+ /* Parse the signature piece */
+ asnin = sk_BIO_value(parts, 1);
+
+ if (!(headers = mime_parse_hdr(asnin))) {
+ ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_MIME_SIG_PARSE_ERROR);
+ sk_BIO_pop_free(parts, BIO_vfree);
+ return NULL;
+ }
+
+ /* Get content type */
+
+ if(!(hdr = mime_hdr_find(headers, "content-type")) ||
+ !hdr->value) {
+ sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
+ ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_SIG_CONTENT_TYPE);
+ return NULL;
+ }
+
+ if(strcmp(hdr->value, "application/x-pkcs7-signature") &&
+ strcmp(hdr->value, "application/pkcs7-signature")) {
+ ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_SIG_INVALID_MIME_TYPE);
+ ERR_add_error_data(2, "type: ", hdr->value);
+ sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
+ sk_BIO_pop_free(parts, BIO_vfree);
+ return NULL;
+ }
+ sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
+ /* Read in ASN1 */
+ if(!(val = b64_read_asn1(asnin, it))) {
+ ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_ASN1_SIG_PARSE_ERROR);
+ sk_BIO_pop_free(parts, BIO_vfree);
+ return NULL;
+ }
+
+ if(bcont) {
+ *bcont = sk_BIO_value(parts, 0);
+ BIO_free(asnin);
+ sk_BIO_free(parts);
+ } else sk_BIO_pop_free(parts, BIO_vfree);
+ return val;
+ }
+
+ /* OK, if not multipart/signed try opaque signature */
+
+ if (strcmp (hdr->value, "application/x-pkcs7-mime") &&
+ strcmp (hdr->value, "application/pkcs7-mime")) {
+ ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_INVALID_MIME_TYPE);
+ ERR_add_error_data(2, "type: ", hdr->value);
+ sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
+ return NULL;
+ }
+
+ sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
+
+ if(!(val = b64_read_asn1(bio, it))) {
+ ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_PARSE_ERROR);
+ return NULL;
+ }
+ return val;
+
+}
+
+/* Copy text from one BIO to another making the output CRLF at EOL */
+int SMIME_crlf_copy(BIO *in, BIO *out, int flags)
+{
+ BIO *bf;
+ char eol;
+ int len;
+ char linebuf[MAX_SMLEN];
+ /* Buffer output so we don't write one line at a time. This is
+ * useful when streaming as we don't end up with one OCTET STRING
+ * per line.
+ */
+ bf = BIO_new(BIO_f_buffer());
+ if (!bf)
+ return 0;
+ out = BIO_push(bf, out);
+ if(flags & SMIME_BINARY)
+ {
+ while((len = BIO_read(in, linebuf, MAX_SMLEN)) > 0)
+ BIO_write(out, linebuf, len);
+ }
+ else
+ {
+ if(flags & SMIME_TEXT)
+ BIO_printf(out, "Content-Type: text/plain\r\n\r\n");
+ while ((len = BIO_gets(in, linebuf, MAX_SMLEN)) > 0)
+ {
+ eol = strip_eol(linebuf, &len);
+ if (len)
+ BIO_write(out, linebuf, len);
+ if(eol) BIO_write(out, "\r\n", 2);
+ }
+ }
+ (void)BIO_flush(out);
+ BIO_pop(out);
+ BIO_free(bf);
+ return 1;
+}
+
+/* Strip off headers if they are text/plain */
+int SMIME_text(BIO *in, BIO *out)
+{
+ char iobuf[4096];
+ int len;
+ STACK_OF(MIME_HEADER) *headers;
+ MIME_HEADER *hdr;
+
+ if (!(headers = mime_parse_hdr(in))) {
+ ASN1err(ASN1_F_SMIME_TEXT,ASN1_R_MIME_PARSE_ERROR);
+ return 0;
+ }
+ if(!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) {
+ ASN1err(ASN1_F_SMIME_TEXT,ASN1_R_MIME_NO_CONTENT_TYPE);
+ sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
+ return 0;
+ }
+ if (strcmp (hdr->value, "text/plain")) {
+ ASN1err(ASN1_F_SMIME_TEXT,ASN1_R_INVALID_MIME_TYPE);
+ ERR_add_error_data(2, "type: ", hdr->value);
+ sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
+ return 0;
+ }
+ sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
+ while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0)
+ BIO_write(out, iobuf, len);
+ if (len < 0)
+ return 0;
+ return 1;
+}
+
+/* Split a multipart/XXX message body into component parts: result is
+ * canonical parts in a STACK of bios
+ */
+
+static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret)
+{
+ char linebuf[MAX_SMLEN];
+ int len, blen;
+ int eol = 0, next_eol = 0;
+ BIO *bpart = NULL;
+ STACK_OF(BIO) *parts;
+ char state, part, first;
+
+ blen = strlen(bound);
+ part = 0;
+ state = 0;
+ first = 1;
+ parts = sk_BIO_new_null();
+ *ret = parts;
+ while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
+ state = mime_bound_check(linebuf, len, bound, blen);
+ if(state == 1) {
+ first = 1;
+ part++;
+ } else if(state == 2) {
+ sk_BIO_push(parts, bpart);
+ return 1;
+ } else if(part) {
+ /* Strip CR+LF from linebuf */
+ next_eol = strip_eol(linebuf, &len);
+ if(first) {
+ first = 0;
+ if(bpart) sk_BIO_push(parts, bpart);
+ bpart = BIO_new(BIO_s_mem());
+ BIO_set_mem_eof_return(bpart, 0);
+ } else if (eol)
+ BIO_write(bpart, "\r\n", 2);
+ eol = next_eol;
+ if (len)
+ BIO_write(bpart, linebuf, len);
+ }
+ }
+ return 0;
+}
+
+/* This is the big one: parse MIME header lines up to message body */
+
+#define MIME_INVALID 0
+#define MIME_START 1
+#define MIME_TYPE 2
+#define MIME_NAME 3
+#define MIME_VALUE 4
+#define MIME_QUOTE 5
+#define MIME_COMMENT 6
+
+
+static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio)
+{
+ char *p, *q, c;
+ char *ntmp;
+ char linebuf[MAX_SMLEN];
+ MIME_HEADER *mhdr = NULL;
+ STACK_OF(MIME_HEADER) *headers;
+ int len, state, save_state = 0;
+
+ headers = sk_MIME_HEADER_new(mime_hdr_cmp);
+ if (!headers)
+ return NULL;
+ while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
+ /* If whitespace at line start then continuation line */
+ if(mhdr && isspace((unsigned char)linebuf[0])) state = MIME_NAME;
+ else state = MIME_START;
+ ntmp = NULL;
+ /* Go through all characters */
+ for(p = linebuf, q = linebuf; (c = *p) && (c!='\r') && (c!='\n'); p++) {
+
+ /* State machine to handle MIME headers
+ * if this looks horrible that's because it *is*
+ */
+
+ switch(state) {
+ case MIME_START:
+ if(c == ':') {
+ state = MIME_TYPE;
+ *p = 0;
+ ntmp = strip_ends(q);
+ q = p + 1;
+ }
+ break;
+
+ case MIME_TYPE:
+ if(c == ';') {
+ mime_debug("Found End Value\n");
+ *p = 0;
+ mhdr = mime_hdr_new(ntmp, strip_ends(q));
+ sk_MIME_HEADER_push(headers, mhdr);
+ ntmp = NULL;
+ q = p + 1;
+ state = MIME_NAME;
+ } else if(c == '(') {
+ save_state = state;
+ state = MIME_COMMENT;
+ }
+ break;
+
+ case MIME_COMMENT:
+ if(c == ')') {
+ state = save_state;
+ }
+ break;
+
+ case MIME_NAME:
+ if(c == '=') {
+ state = MIME_VALUE;
+ *p = 0;
+ ntmp = strip_ends(q);
+ q = p + 1;
+ }
+ break ;
+
+ case MIME_VALUE:
+ if(c == ';') {
+ state = MIME_NAME;
+ *p = 0;
+ mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
+ ntmp = NULL;
+ q = p + 1;
+ } else if (c == '"') {
+ mime_debug("Found Quote\n");
+ state = MIME_QUOTE;
+ } else if(c == '(') {
+ save_state = state;
+ state = MIME_COMMENT;
+ }
+ break;
+
+ case MIME_QUOTE:
+ if(c == '"') {
+ mime_debug("Found Match Quote\n");
+ state = MIME_VALUE;
+ }
+ break;
+ }
+ }
+
+ if(state == MIME_TYPE) {
+ mhdr = mime_hdr_new(ntmp, strip_ends(q));
+ sk_MIME_HEADER_push(headers, mhdr);
+ } else if(state == MIME_VALUE)
+ mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
+ if(p == linebuf) break; /* Blank line means end of headers */
+}
+
+return headers;
+
+}
+
+static char *strip_ends(char *name)
+{
+ return strip_end(strip_start(name));
+}
+
+/* Strip a parameter of whitespace from start of param */
+static char *strip_start(char *name)
+{
+ char *p, c;
+ /* Look for first non white space or quote */
+ for(p = name; (c = *p) ;p++) {
+ if(c == '"') {
+ /* Next char is start of string if non null */
+ if(p[1]) return p + 1;
+ /* Else null string */
+ return NULL;
+ }
+ if(!isspace((unsigned char)c)) return p;
+ }
+ return NULL;
+}
+
+/* As above but strip from end of string : maybe should handle brackets? */
+static char *strip_end(char *name)
+{
+ char *p, c;
+ if(!name) return NULL;
+ /* Look for first non white space or quote */
+ for(p = name + strlen(name) - 1; p >= name ;p--) {
+ c = *p;
+ if(c == '"') {
+ if(p - 1 == name) return NULL;
+ *p = 0;
+ return name;
+ }
+ if(isspace((unsigned char)c)) *p = 0;
+ else return name;
+ }
+ return NULL;
+}
+
+static MIME_HEADER *mime_hdr_new(char *name, char *value)
+{
+ MIME_HEADER *mhdr;
+ char *tmpname, *tmpval, *p;
+ int c;
+ if(name) {
+ if(!(tmpname = BUF_strdup(name))) return NULL;
+ for(p = tmpname ; *p; p++) {
+ c = (unsigned char)*p;
+ if(isupper(c)) {
+ c = tolower(c);
+ *p = c;
+ }
+ }
+ } else tmpname = NULL;
+ if(value) {
+ if(!(tmpval = BUF_strdup(value))) return NULL;
+ for(p = tmpval ; *p; p++) {
+ c = (unsigned char)*p;
+ if(isupper(c)) {
+ c = tolower(c);
+ *p = c;
+ }
+ }
+ } else tmpval = NULL;
+ mhdr = (MIME_HEADER *) OPENSSL_malloc(sizeof(MIME_HEADER));
+ if(!mhdr) return NULL;
+ mhdr->name = tmpname;
+ mhdr->value = tmpval;
+ if(!(mhdr->params = sk_MIME_PARAM_new(mime_param_cmp))) return NULL;
+ return mhdr;
+}
+
+static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value)
+{
+ char *tmpname, *tmpval, *p;
+ int c;
+ MIME_PARAM *mparam;
+ if(name) {
+ tmpname = BUF_strdup(name);
+ if(!tmpname) return 0;
+ for(p = tmpname ; *p; p++) {
+ c = (unsigned char)*p;
+ if(isupper(c)) {
+ c = tolower(c);
+ *p = c;
+ }
+ }
+ } else tmpname = NULL;
+ if(value) {
+ tmpval = BUF_strdup(value);
+ if(!tmpval) return 0;
+ } else tmpval = NULL;
+ /* Parameter values are case sensitive so leave as is */
+ mparam = (MIME_PARAM *) OPENSSL_malloc(sizeof(MIME_PARAM));
+ if(!mparam) return 0;
+ mparam->param_name = tmpname;
+ mparam->param_value = tmpval;
+ sk_MIME_PARAM_push(mhdr->params, mparam);
+ return 1;
+}
+
+static int mime_hdr_cmp(const MIME_HEADER * const *a,
+ const MIME_HEADER * const *b)
+{
+ if (!(*a)->name || !(*b)->name)
+ return !!(*a)->name - !!(*b)->name;
+
+ return(strcmp((*a)->name, (*b)->name));
+}
+
+static int mime_param_cmp(const MIME_PARAM * const *a,
+ const MIME_PARAM * const *b)
+{
+ if (!(*a)->param_name || !(*b)->param_name)
+ return !!(*a)->param_name - !!(*b)->param_name;
+ return(strcmp((*a)->param_name, (*b)->param_name));
+}
+
+/* Find a header with a given name (if possible) */
+
+static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name)
+{
+ MIME_HEADER htmp;
+ int idx;
+ htmp.name = name;
+ idx = sk_MIME_HEADER_find(hdrs, &htmp);
+ if(idx < 0) return NULL;
+ return sk_MIME_HEADER_value(hdrs, idx);
+}
+
+static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name)
+{
+ MIME_PARAM param;
+ int idx;
+ param.param_name = name;
+ idx = sk_MIME_PARAM_find(hdr->params, ¶m);
+ if(idx < 0) return NULL;
+ return sk_MIME_PARAM_value(hdr->params, idx);
+}
+
+static void mime_hdr_free(MIME_HEADER *hdr)
+{
+ if(hdr->name) OPENSSL_free(hdr->name);
+ if(hdr->value) OPENSSL_free(hdr->value);
+ if(hdr->params) sk_MIME_PARAM_pop_free(hdr->params, mime_param_free);
+ OPENSSL_free(hdr);
+}
+
+static void mime_param_free(MIME_PARAM *param)
+{
+ if(param->param_name) OPENSSL_free(param->param_name);
+ if(param->param_value) OPENSSL_free(param->param_value);
+ OPENSSL_free(param);
+}
+
+/* Check for a multipart boundary. Returns:
+ * 0 : no boundary
+ * 1 : part boundary
+ * 2 : final boundary
+ */
+static int mime_bound_check(char *line, int linelen, char *bound, int blen)
+{
+ if(linelen == -1) linelen = strlen(line);
+ if(blen == -1) blen = strlen(bound);
+ /* Quickly eliminate if line length too short */
+ if(blen + 2 > linelen) return 0;
+ /* Check for part boundary */
+ if(!strncmp(line, "--", 2) && !strncmp(line + 2, bound, blen)) {
+ if(!strncmp(line + blen + 2, "--", 2)) return 2;
+ else return 1;
+ }
+ return 0;
+}
+
+static int strip_eol(char *linebuf, int *plen)
+ {
+ int len = *plen;
+ char *p, c;
+ int is_eol = 0;
+ p = linebuf + len - 1;
+ for (p = linebuf + len - 1; len > 0; len--, p--)
+ {
+ c = *p;
+ if (c == '\n')
+ is_eol = 1;
+ else if (c != '\r')
+ break;
+ }
+ *plen = len;
+ return is_eol;
+ }
projects / cassiopeia.git / blobdiff