Merge in my S/MIME library and utility.

1 files changed, 673 insertions, 0 deletions

diff --git a/crypto/pkcs7/pk7_mime.c b/crypto/pkcs7/pk7_mime.c
new file mode 100644
index 0000000000..f346259b92
--- /dev/null
+++ b/crypto/pkcs7/pk7_mime.c
@@ -0,0 +1,673 @@
+/* pk7_mime.c */
+/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
+ * project 1999.
+ */
+/* ====================================================================
+ * Copyright (c) 1999 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.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com).  This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com).
+ *
+ */
+
+#include <stdio.h>
+#include <ctype.h>
+#include "cryptlib.h"
+#include <openssl/rand.h>
+#include <openssl/x509.h>
+
+/* MIME and related routines */
+
+/* MIME format structures
+ * Note that all are translated to lower case apart from
+ * parameter values. Quotes are stripped off
+ */
+
+typedef struct {
+char *name;				/* Name of line e.g. "content-type" */
+char *value;				/* Value of line e.g. "text/plain" */
+STACK /* MIME_PARAM */ *params;		/* Zero or more parameters */
+} MIME_HEADER;
+
+typedef struct {
+char *param_name;			/* Param name e.g. "micalg" */
+char *param_value;			/* Param value e.g. "sha1" */
+} MIME_PARAM;
+
+
+static int B64_write_PKCS7(BIO *bio, PKCS7 *p7);
+static PKCS7 *B64_read_PKCS7(BIO *bio);
+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 *mime_parse_hdr(BIO *bio);
+static int mime_hdr_cmp(MIME_HEADER **a, MIME_HEADER **b);
+static int mime_param_cmp(MIME_PARAM **a, MIME_PARAM **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 **ret);
+static int iscrlf(char c);
+static MIME_HEADER *mime_hdr_find(STACK *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 */
+
+
+typedef void (*stkfree)();
+
+/* Base 64 read and write of PKCS#7 structure */
+
+static int B64_write_PKCS7(BIO *bio, PKCS7 *p7)
+{
+	BIO *b64;
+	if(!(b64 = BIO_new(BIO_f_base64()))) {
+		PKCS7err(PKCS7_F_B64_WRITE_PKCS7,ERR_R_MALLOC_FAILURE);
+		return 0;
+	}
+	bio = BIO_push(b64, bio);
+	i2d_PKCS7_bio(bio, p7);
+	BIO_flush(bio);
+	bio = BIO_pop(bio);
+	BIO_free(b64);
+	return 1;
+}
+
+static PKCS7 *B64_read_PKCS7(BIO *bio)
+{
+	BIO *b64;
+	PKCS7 *p7;
+	if(!(b64 = BIO_new(BIO_f_base64()))) {
+		PKCS7err(PKCS7_F_B64_READ_PKCS7,ERR_R_MALLOC_FAILURE);
+		return 0;
+	}
+	bio = BIO_push(b64, bio);
+	if(!(p7 = d2i_PKCS7_bio(bio, NULL))) 
+		PKCS7err(PKCS7_F_B64_READ_PKCS7,PKCS7_R_DECODE_ERROR);
+	BIO_flush(bio);
+	bio = BIO_pop(bio);
+	BIO_free(b64);
+	return p7;
+}
+
+/* SMIME sender */
+
+int SMIME_write_PKCS7(BIO *bio, PKCS7 *p7, BIO *data, int flags)
+{
+	char linebuf[MAX_SMLEN];
+	char bound[33], c;
+	int i;
+	if((flags & PKCS7_DETACHED) && data) {
+	/* We want multipart/signed */
+		/* Generate a random boundary */
+		RAND_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\n");
+		BIO_printf(bio, "Content-Type: multipart/signed ; ");
+		BIO_printf(bio, "protocol=\"application/x-pkcs7-signature\" ; ");
+		BIO_printf(bio, "micalg=sha1 ; boundary=\"----%s\"\n\n", bound);
+		BIO_printf(bio, "This is an S/MIME signed message\n\n");
+		/* Now write out the first part */
+		BIO_printf(bio, "------%s\r\n", bound);
+		if(flags & PKCS7_TEXT) BIO_printf(bio, "Content-Type: text/plain\n\n");
+		while((i = BIO_read(data, linebuf, MAX_SMLEN)) > 0) 
+						BIO_write(bio, linebuf, i);
+		BIO_printf(bio, "\n------%s\n", bound);
+
+		/* Headers for signature */
+
+		BIO_printf(bio, "Content-Type: application/x-pkcs7-signature; name=\"smime.p7s\"\n");
+		BIO_printf(bio, "Content-Transfer-Encoding: base64\n");
+		BIO_printf(bio, "Content-Disposition: attachment; filename=\"smime.p7s\"\n\n");
+		B64_write_PKCS7(bio, p7);
+		BIO_printf(bio,"\n------%s--\n\n", bound);
+		return 1;
+	}
+	/* MIME headers */
+	BIO_printf(bio, "MIME-Version: 1.0\n");
+	BIO_printf(bio, "Content-Disposition: attachment; filename=\"smime.p7m\"\n");
+	BIO_printf(bio, "Content-Type: application/x-pkcs7-mime; name=\"smime.p7m\"\n");
+	BIO_printf(bio, "Content-Transfer-Encoding: base64\n\n");
+	B64_write_PKCS7(bio, p7);
+	BIO_printf(bio, "\n");
+	return 1;
+}
+
+/* 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
+ */
+
+PKCS7 *SMIME_read_PKCS7(BIO *bio, BIO **bcont)
+{
+	BIO *p7in;
+	STACK *headers = NULL;
+	STACK *parts = NULL;
+	MIME_HEADER *hdr;
+	MIME_PARAM *prm;
+	PKCS7 *p7;
+	int ret;
+
+	if(bcont) *bcont = NULL;
+
+	if (!(headers = mime_parse_hdr(bio))) {
+		PKCS7err(PKCS7_F_SMIME_READ_PKCS7,PKCS7_R_MIME_PARSE_ERROR);
+		return NULL;
+	}
+
+	if(!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) {
+		sk_pop_free(headers, mime_hdr_free);
+		PKCS7err(PKCS7_F_SMIME_READ_PKCS7, PKCS7_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_pop_free(headers, mime_hdr_free);
+			PKCS7err(PKCS7_F_SMIME_READ_PKCS7, PKCS7_R_NO_MULTIPART_BOUNDARY);
+			return NULL;
+		}
+		ret = multi_split(bio, prm->param_value, &parts);
+		sk_pop_free(headers, mime_hdr_free);
+		if(!ret || (sk_num(parts) != 2) ) {
+			PKCS7err(PKCS7_F_SMIME_READ_PKCS7, PKCS7_R_NO_MULTIPART_BODY_FAILURE);
+			sk_pop_free(parts, (stkfree)BIO_free);
+			return NULL;
+		}
+
+		/* Parse the signature piece */
+		p7in = (BIO *)sk_value(parts, 1);
+
+		if (!(headers = mime_parse_hdr(p7in))) {
+			PKCS7err(PKCS7_F_SMIME_READ_PKCS7,PKCS7_R_MIME_SIG_PARSE_ERROR);
+			sk_pop_free(parts, (stkfree)BIO_free);
+			return NULL;
+		}
+
+		/* Get content type */
+
+		if(!(hdr = mime_hdr_find(headers, "content-type")) ||
+								 !hdr->value) {
+			sk_pop_free(headers, mime_hdr_free);
+			PKCS7err(PKCS7_F_SMIME_READ_PKCS7, PKCS7_R_NO_SIG_CONTENT_TYPE);
+			return NULL;
+		}
+
+		if(strcmp(hdr->value, "application/x-pkcs7-signature") &&
+			strcmp(hdr->value, "application/pkcs7-signature")) {
+			sk_pop_free(headers, mime_hdr_free);
+			PKCS7err(PKCS7_F_SMIME_READ_PKCS7,PKCS7_R_SIG_INVALID_MIME_TYPE);
+			ERR_add_error_data(2, "type: ", hdr->value);
+			sk_pop_free(parts, (stkfree)BIO_free);
+			return NULL;
+		}
+		sk_pop_free(headers, mime_hdr_free);
+		/* Read in PKCS#7 */
+		if(!(p7 = B64_read_PKCS7(p7in))) {
+			PKCS7err(PKCS7_F_SMIME_READ_PKCS7,PKCS7_R_PKCS7_SIG_PARSE_ERROR);
+			sk_pop_free(parts, (stkfree)BIO_free);
+			return NULL;
+		}
+
+		if(bcont) {
+			*bcont = (BIO *)sk_value(parts, 0);
+			BIO_free(p7in);
+			sk_free(parts);
+		} else sk_pop_free(parts, (stkfree)BIO_free);
+		return p7;
+	}
+		
+	/* OK, if not multipart/signed try opaque signature */
+
+	if (strcmp (hdr->value, "application/x-pkcs7-mime") &&
+	    strcmp (hdr->value, "application/pkcs7-mime")) {
+		PKCS7err(PKCS7_F_SMIME_READ_PKCS7,PKCS7_R_INVALID_MIME_TYPE);
+		ERR_add_error_data(2, "type: ", hdr->value);
+		sk_pop_free(headers, mime_hdr_free);
+		return NULL;
+	}
+
+	sk_pop_free(headers, mime_hdr_free);
+	
+	if(!(p7 = B64_read_PKCS7(bio))) {
+		PKCS7err(PKCS7_F_SMIME_READ_PKCS7, PKCS7_R_PKCS7_PARSE_ERROR);
+		return NULL;
+	}
+	return p7;
+
+}
+
+/* Copy text from one BIO to another making the output CRLF at EOL */
+int SMIME_crlf_copy(BIO *in, BIO *out, int flags)
+{
+	char eol;
+	int len;
+	char linebuf[MAX_SMLEN];
+	if(flags & PKCS7_BINARY) {
+		while((len = BIO_read(in, linebuf, MAX_SMLEN)) > 0)
+						BIO_write(out, linebuf, len);
+		return 1;
+	}
+	if(flags & PKCS7_TEXT) BIO_printf(out, "Content-Type: text/plain\r\n\r\n");
+	while ((len = BIO_gets(in, linebuf, MAX_SMLEN)) > 0) {
+		eol = 0;
+		while(iscrlf(linebuf[len - 1])) {
+			len--;
+			eol = 1;
+		}	
+		BIO_write(out, linebuf, len);
+		if(eol) BIO_write(out, "\r\n", 2);
+	}
+	return 1;
+}
+
+/* Strip off headers if they are text/plain */
+int SMIME_text(BIO *in, BIO *out)
+{
+	char iobuf[4096];
+	int len;
+	STACK *headers;
+	MIME_HEADER *hdr;
+	if (!(headers = mime_parse_hdr(in))) {
+		PKCS7err(PKCS7_F_SMIME_TEXT,PKCS7_R_MIME_PARSE_ERROR);
+		return 0;
+	}
+	if(!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) {
+		PKCS7err(PKCS7_F_SMIME_TEXT,PKCS7_R_MIME_NO_CONTENT_TYPE);
+		sk_pop_free(headers, mime_hdr_free);
+		return 0;
+	}
+	if (strcmp (hdr->value, "text/plain")) {
+		PKCS7err(PKCS7_F_SMIME_TEXT,PKCS7_R_INVALID_MIME_TYPE);
+		ERR_add_error_data(2, "type: ", hdr->value);
+		sk_pop_free(headers, mime_hdr_free);
+		return 0;
+	}
+	sk_pop_free(headers, mime_hdr_free);
+	while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0)
+						BIO_write(out, iobuf, len);
+	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 **ret)
+{
+	char linebuf[MAX_SMLEN];
+	int len, blen;
+	BIO *bpart = NULL;
+	STACK *parts;
+	char state, part, first;
+	blen = strlen(bound);
+	part = 0;
+	state = 0;
+	first = 1;
+	parts = sk_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_push(parts, (char *)bpart);
+			return 1;
+		} else if(part) {
+			if(first) {
+				first = 0;
+				if(bpart) sk_push(parts, (char *)bpart);
+				bpart = BIO_new(BIO_s_mem());
+				
+			} else BIO_write(bpart, "\r\n", 2);
+			/* Strip CR+LF from linebuf */
+			while(iscrlf(linebuf[len - 1])) len--;
+			BIO_write(bpart, linebuf, len);
+		}
+	}
+	return 0;
+}
+
+static int iscrlf(char c)
+{
+	if(c == '\r' || c == '\n') return 1;
+	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 *mime_parse_hdr(BIO *bio)
+{
+	char *p, *q, c;
+	char *ntmp;
+	char linebuf[MAX_SMLEN];
+	MIME_HEADER *mhdr = NULL;
+	STACK *headers;
+	int len, state, save_state = 0;
+	headers = sk_new(mime_hdr_cmp);
+	while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
+	/* If whitespace at line start then continuation line */
+	if(mhdr && isspace(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_push(headers, (char *)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_push(headers, (char *)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(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(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 *) Malloc(sizeof(MIME_HEADER));
+	if(!mhdr) return NULL;
+	mhdr->name = tmpname;
+	mhdr->value = tmpval;
+	if(!(mhdr->params = sk_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;
+	/* Paramter values are case sensitive so leave as is */
+	mparam = (MIME_PARAM *) Malloc(sizeof(MIME_PARAM));
+	if(!mparam) return 0;
+	mparam->param_name = tmpname;
+	mparam->param_value = tmpval;
+	sk_push(mhdr->params, (char *)mparam);
+	return 1;
+}
+
+static int mime_hdr_cmp(MIME_HEADER **a, MIME_HEADER **b)
+{
+	return(strcmp((*a)->name, (*b)->name));
+}
+
+static int mime_param_cmp(MIME_PARAM **a, MIME_PARAM **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 *hdrs, char *name)
+{
+	MIME_HEADER htmp;
+	int idx;
+	htmp.name = name;
+	idx = sk_find(hdrs, (char *)&htmp);
+	if(idx < 0) return NULL;
+	return (MIME_HEADER *)sk_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_find(hdr->params, (char *)&param);
+	if(idx < 0) return NULL;
+	return (MIME_PARAM *)sk_value(hdr->params, idx);
+}
+
+static void mime_hdr_free(MIME_HEADER *hdr)
+{
+	if(hdr->name) Free(hdr->name);
+	if(hdr->value) Free(hdr->value);
+	if(hdr->params) sk_pop_free(hdr->params, mime_param_free);
+	Free((char *)hdr);
+}
+
+static void mime_param_free(MIME_PARAM *param)
+{
+	if(param->param_name) Free(param->param_name);
+	if(param->param_value) Free(param->param_value);
+	Free((char *)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;
+}