diff options
Diffstat (limited to 'openssl-1.1.0h/crypto/asn1/asn_mime.c')
| -rw-r--r-- | openssl-1.1.0h/crypto/asn1/asn_mime.c | 981 |
1 files changed, 981 insertions, 0 deletions
diff --git a/openssl-1.1.0h/crypto/asn1/asn_mime.c b/openssl-1.1.0h/crypto/asn1/asn_mime.c new file mode 100644 index 0000000..84475e9 --- /dev/null +++ b/openssl-1.1.0h/crypto/asn1/asn_mime.c @@ -0,0 +1,981 @@ +/* + * 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 <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 && 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; + 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 (!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(const char *name, const char *value) +{ + MIME_HEADER *mhdr = NULL; + char *tmpname = NULL, *tmpval = NULL, *p; + int c; + + if (name) { + if ((tmpname = OPENSSL_strdup(name)) == NULL) + return NULL; + for (p = tmpname; *p; p++) { + c = (unsigned char)*p; + if (isupper(c)) { + c = tolower(c); + *p = c; + } + } + } + if (value) { + if ((tmpval = OPENSSL_strdup(value)) == NULL) + goto err; + for (p = tmpval; *p; p++) { + c = (unsigned char)*p; + if (isupper(c)) { + c = tolower(c); + *p = c; + } + } + } + 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; + int c; + MIME_PARAM *mparam = NULL; + if (name) { + tmpname = OPENSSL_strdup(name); + if (!tmpname) + goto err; + for (p = tmpname; *p; p++) { + c = (unsigned char)*p; + if (isupper(c)) { + c = tolower(c); + *p = c; + } + } + } + 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); + if (idx < 0) + return NULL; + 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, ¶m); + if (idx < 0) + return NULL; + 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; + p = linebuf + len - 1; + 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 < 33) + continue; + else if (c != '\r') + break; + } + *plen = len; + return is_eol; +} |