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asn_mime.c

/* 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>

/* 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 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 */

/* 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 = ASN1_item_i2d_bio(it, out, val);
      (void)BIO_flush(out);
      BIO_pop(out);
      BIO_free(b64);
      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)
      {
      int i, have_unknown = 0, write_comma, 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);
            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;

                  default:
                  if (have_unknown)
                        write_comma = 0;
                  else
                        {
                        BIO_puts(out, "unknown");
                        have_unknown = 1;
                        }
                  break;

                  }
            }

      return 1;

      }

/* SMIME sender */

int int_smime_write_ASN1(BIO *bio, ASN1_VALUE *val, BIO *data, int flags,
                        int ctype_nid, int econt_nid,
                        STACK_OF(X509_ALGOR) *mdalgs,
                        asn1_output_data_fn *data_fn,
                        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 (!data_fn(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;
}

#if 0

/* 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;

      if (!(flags & SMIME_DETACHED))
            {
            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)
            return 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 1;

      }

#endif

/* 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")) {
                  sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
                  ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_SIG_INVALID_MIME_TYPE);
                  ERR_add_error_data(2, "type: ", hdr->value);
                  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);
      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 = *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 = *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 = *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)
{
      return(strcmp((*a)->name, (*b)->name));
}

static int mime_param_cmp(const MIME_PARAM * const *a,
                  const MIME_PARAM * const *b)
{
      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, &param);
      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;
      }

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