Upgrade openssl from 1.1.0e to 1.1.1b, with source code. 4.0.78

trunk/3rdparty/openssl-1.1-fit/crypto/asn1/asn_mime.c

@@ -0,0 +1,963 @@
+/*
+ * Copyright 2008-2018 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#include <stdio.h>
+#include "internal/ctype.h"
+#include "internal/cryptlib.h"
+#include <openssl/rand.h>
+#include <openssl/x509.h>
+#include <openssl/asn1.h>
+#include <openssl/asn1t.h>
+#include "internal/evp_int.h"
+#include "internal/bio.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
+ */
+
+struct mime_param_st {
+    char *param_name;           /* Param name e.g. "micalg" */
+    char *param_value;          /* Param value e.g. "sha1" */
+};
+
+struct mime_header_st {
+    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 */
+};
+
+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(const char *name, const char *value);
+static int mime_hdr_addparam(MIME_HEADER *mhdr, const char *name, const 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, const char *bound, int blen);
+static int multi_split(BIO *bio, const char *bound, STACK_OF(BIO) **ret);
+static int strip_eol(char *linebuf, int *plen, int flags);
+static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, const char *name);
+static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, const 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 == NULL) {
+        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())) == NULL) {
+        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_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;
+
+        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 */
+        if (RAND_bytes((unsigned char *)bound, 32) <= 0)
+            return 0;
+        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 detached 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)) == NULL) {
+        ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_MIME_PARSE_ERROR);
+        return NULL;
+    }
+
+    if ((hdr = mime_hdr_find(headers, "content-type")) == NULL
+        || hdr->value == NULL) {
+        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") == 0) {
+        /* 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)) == NULL) {
+            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")) == NULL
+            || hdr->value == NULL) {
+            sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
+            ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_SIG_CONTENT_TYPE);
+            sk_BIO_pop_free(parts, BIO_vfree);
+            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)) == NULL) {
+            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)) == NULL) {
+        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 == NULL)
+        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 {
+        int eolcnt = 0;
+        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, flags);
+            if (len) {
+                /* Not EOF: write out all CRLF */
+                if (flags & SMIME_ASCIICRLF) {
+                    int i;
+                    for (i = 0; i < eolcnt; i++)
+                        BIO_write(out, "\r\n", 2);
+                    eolcnt = 0;
+                }
+                BIO_write(out, linebuf, len);
+                if (eol)
+                    BIO_write(out, "\r\n", 2);
+            } else if (flags & SMIME_ASCIICRLF)
+                eolcnt++;
+            else 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)) == NULL) {
+        ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_MIME_PARSE_ERROR);
+        return 0;
+    }
+    if ((hdr = mime_hdr_find(headers, "content-type")) == NULL
+        || hdr->value == NULL) {
+        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, const 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;
+    if (*ret == NULL)
+        return 0;
+    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) {
+            if (!sk_BIO_push(parts, bpart)) {
+                BIO_free(bpart);
+                return 0;
+            }
+            return 1;
+        } else if (part) {
+            /* Strip CR+LF from linebuf */
+            next_eol = strip_eol(linebuf, &len, 0);
+            if (first) {
+                first = 0;
+                if (bpart)
+                    if (!sk_BIO_push(parts, bpart)) {
+                        BIO_free(bpart);
+                        return 0;
+                    }
+                bpart = BIO_new(BIO_s_mem());
+                if (bpart == NULL)
+                    return 0;
+                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);
+        }
+    }
+    BIO_free(bpart);
+    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, *new_hdr = NULL;
+    STACK_OF(MIME_HEADER) *headers;
+    int len, state, save_state = 0;
+
+    headers = sk_MIME_HEADER_new(mime_hdr_cmp);
+    if (headers == NULL)
+        return NULL;
+    while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
+        /* If whitespace at line start then continuation line */
+        if (mhdr && ossl_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;
+                    new_hdr = mime_hdr_new(ntmp, strip_ends(q));
+                    if (new_hdr == NULL)
+                        goto err;
+                    if (!sk_MIME_HEADER_push(headers, new_hdr))
+                        goto err;
+                    mhdr = new_hdr;
+                    new_hdr = NULL;
+                    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) {
+            new_hdr = mime_hdr_new(ntmp, strip_ends(q));
+            if (new_hdr == NULL)
+                goto err;
+            if (!sk_MIME_HEADER_push(headers, new_hdr))
+                goto err;
+            mhdr = new_hdr;
+            new_hdr = NULL;
+        } 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;
+
+err:
+    mime_hdr_free(new_hdr);
+    sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
+    return NULL;
+}
+
+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 (!ossl_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 (ossl_isspace(c))
+            *p = 0;
+        else
+            return name;
+    }
+    return NULL;
+}
+
+static MIME_HEADER *mime_hdr_new(const char *name, const char *value)
+{
+    MIME_HEADER *mhdr = NULL;
+    char *tmpname = NULL, *tmpval = NULL, *p;
+
+    if (name) {
+        if ((tmpname = OPENSSL_strdup(name)) == NULL)
+            return NULL;
+        for (p = tmpname; *p; p++)
+            *p = ossl_tolower(*p);
+    }
+    if (value) {
+        if ((tmpval = OPENSSL_strdup(value)) == NULL)
+            goto err;
+        for (p = tmpval; *p; p++)
+            *p = ossl_tolower(*p);
+    }
+    mhdr = OPENSSL_malloc(sizeof(*mhdr));
+    if (mhdr == NULL)
+        goto err;
+    mhdr->name = tmpname;
+    mhdr->value = tmpval;
+    if ((mhdr->params = sk_MIME_PARAM_new(mime_param_cmp)) == NULL)
+        goto err;
+    return mhdr;
+
+ err:
+    OPENSSL_free(tmpname);
+    OPENSSL_free(tmpval);
+    OPENSSL_free(mhdr);
+    return NULL;
+}
+
+static int mime_hdr_addparam(MIME_HEADER *mhdr, const char *name, const char *value)
+{
+    char *tmpname = NULL, *tmpval = NULL, *p;
+    MIME_PARAM *mparam = NULL;
+
+    if (name) {
+        tmpname = OPENSSL_strdup(name);
+        if (!tmpname)
+            goto err;
+        for (p = tmpname; *p; p++)
+            *p = ossl_tolower(*p);
+    }
+    if (value) {
+        tmpval = OPENSSL_strdup(value);
+        if (!tmpval)
+            goto err;
+    }
+    /* Parameter values are case sensitive so leave as is */
+    mparam = OPENSSL_malloc(sizeof(*mparam));
+    if (mparam == NULL)
+        goto err;
+    mparam->param_name = tmpname;
+    mparam->param_value = tmpval;
+    if (!sk_MIME_PARAM_push(mhdr->params, mparam))
+        goto err;
+    return 1;
+ err:
+    OPENSSL_free(tmpname);
+    OPENSSL_free(tmpval);
+    OPENSSL_free(mparam);
+    return 0;
+}
+
+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, const char *name)
+{
+    MIME_HEADER htmp;
+    int idx;
+
+    htmp.name = (char *)name;
+    htmp.value = NULL;
+    htmp.params = NULL;
+
+    idx = sk_MIME_HEADER_find(hdrs, &htmp);
+    return sk_MIME_HEADER_value(hdrs, idx);
+}
+
+static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, const char *name)
+{
+    MIME_PARAM param;
+    int idx;
+
+    param.param_name = (char *)name;
+    param.param_value = NULL;
+    idx = sk_MIME_PARAM_find(hdr->params, &param);
+    return sk_MIME_PARAM_value(hdr->params, idx);
+}
+
+static void mime_hdr_free(MIME_HEADER *hdr)
+{
+    if (hdr == NULL)
+        return;
+    OPENSSL_free(hdr->name);
+    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)
+{
+    OPENSSL_free(param->param_name);
+    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, const 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) == 0)
+        && strncmp(line + 2, bound, blen) == 0) {
+        if (strncmp(line + blen + 2, "--", 2) == 0)
+            return 2;
+        else
+            return 1;
+    }
+    return 0;
+}
+
+static int strip_eol(char *linebuf, int *plen, int flags)
+{
+    int len = *plen;
+    char *p, c;
+    int is_eol = 0;
+
+    for (p = linebuf + len - 1; len > 0; len--, p--) {
+        c = *p;
+        if (c == '\n') {
+            is_eol = 1;
+        } else if (is_eol && flags & SMIME_ASCIICRLF && c == 32) {
+            /* Strip trailing space on a line; 32 == ASCII for ' ' */
+            continue;
+        } else if (c != '\r') {
+            break;
+        }
+    }
+    *plen = len;
+    return is_eol;
+}