diff options
Diffstat (limited to 'crypto/pkcs7/pk7_mime.c')
| -rw-r--r-- | crypto/pkcs7/pk7_mime.c | 773 |
1 files changed, 773 insertions, 0 deletions
diff --git a/crypto/pkcs7/pk7_mime.c b/crypto/pkcs7/pk7_mime.c new file mode 100644 index 000000000000..134746c1864f --- /dev/null +++ b/crypto/pkcs7/pk7_mime.c @@ -0,0 +1,773 @@ +/* pk7_mime.c */ +/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL + * project. + */ +/* ==================================================================== + * Copyright (c) 1999-2005 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 *param_name; /* Param name e.g. "micalg" */ +char *param_value; /* Param value e.g. "sha1" */ +} MIME_PARAM; + +DECLARE_STACK_OF(MIME_PARAM) +IMPLEMENT_STACK_OF(MIME_PARAM) + +typedef struct { +char *name; /* Name of line e.g. "content-type" */ +char *value; /* Value of line e.g. "text/plain" */ +STACK_OF(MIME_PARAM) *params; /* Zero or more parameters */ +} MIME_HEADER; + +DECLARE_STACK_OF(MIME_HEADER) +IMPLEMENT_STACK_OF(MIME_HEADER) + +static int pkcs7_output_data(BIO *bio, BIO *data, PKCS7 *p7, int flags); +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_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 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 bound[33], c; + int i; + char *mime_prefix, *mime_eol, *msg_type=NULL; + if (flags & PKCS7_NOOLDMIMETYPE) + mime_prefix = "application/pkcs7-"; + else + mime_prefix = "application/x-pkcs7-"; + + if (flags & PKCS7_CRLFEOL) + mime_eol = "\r\n"; + else + mime_eol = "\n"; + if((flags & PKCS7_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_printf(bio, " micalg=sha1; 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); + pkcs7_output_data(bio, data, p7, flags); + 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_PKCS7(bio, p7); + BIO_printf(bio,"%s------%s--%s%s", mime_eol, bound, + mime_eol, mime_eol); + return 1; + } + + /* Determine smime-type header */ + + if (PKCS7_type_is_enveloped(p7)) + msg_type = "enveloped-data"; + else if (PKCS7_type_is_signed(p7)) + { + /* If we have any signers it is signed-data othewise + * certs-only. + */ + STACK_OF(PKCS7_SIGNER_INFO) *sinfos; + sinfos = PKCS7_get_signer_info(p7); + if (sk_PKCS7_SIGNER_INFO_num(sinfos) > 0) + msg_type = "signed-data"; + else + msg_type = "certs-only"; + } + /* MIME headers */ + BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol); + BIO_printf(bio, "Content-Disposition: attachment;"); + BIO_printf(bio, " filename=\"smime.p7m\"%s", 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=\"smime.p7m\"%s", mime_eol); + BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s", + mime_eol, mime_eol); + B64_write_PKCS7(bio, p7); + BIO_printf(bio, "%s", mime_eol); + return 1; +} + +/* Handle output of PKCS#7 data */ + + +static int pkcs7_output_data(BIO *out, BIO *data, PKCS7 *p7, int flags) + { + BIO *tmpbio, *p7bio; + + if (!(flags & PKCS7_STREAM)) + { + SMIME_crlf_copy(data, out, flags); + return 1; + } + + /* Partial sign operation */ + + /* Initialize sign operation */ + p7bio = PKCS7_dataInit(p7, out); + + /* Copy data across, computing digests etc */ + SMIME_crlf_copy(data, p7bio, flags); + + /* Must be detached */ + PKCS7_set_detached(p7, 1); + + /* Finalize signatures */ + PKCS7_dataFinal(p7, p7bio); + + /* Now remove any digests prepended to the BIO */ + + while (p7bio != out) + { + tmpbio = BIO_pop(p7bio); + BIO_free(p7bio); + p7bio = tmpbio; + } + + 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_OF(MIME_HEADER) *headers = NULL; + STACK_OF(BIO) *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_MIME_HEADER_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_MIME_HEADER_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_MIME_HEADER_pop_free(headers, mime_hdr_free); + if(!ret || (sk_BIO_num(parts) != 2) ) { + PKCS7err(PKCS7_F_SMIME_READ_PKCS7, PKCS7_R_NO_MULTIPART_BODY_FAILURE); + sk_BIO_pop_free(parts, BIO_vfree); + return NULL; + } + + /* Parse the signature piece */ + p7in = sk_BIO_value(parts, 1); + + if (!(headers = mime_parse_hdr(p7in))) { + PKCS7err(PKCS7_F_SMIME_READ_PKCS7,PKCS7_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); + 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_MIME_HEADER_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_BIO_pop_free(parts, BIO_vfree); + return NULL; + } + sk_MIME_HEADER_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_BIO_pop_free(parts, BIO_vfree); + return NULL; + } + + if(bcont) { + *bcont = sk_BIO_value(parts, 0); + BIO_free(p7in); + sk_BIO_free(parts); + } else sk_BIO_pop_free(parts, BIO_vfree); + 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_MIME_HEADER_pop_free(headers, mime_hdr_free); + return NULL; + } + + sk_MIME_HEADER_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 = strip_eol(linebuf, &len); + if (len) + 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_OF(MIME_HEADER) *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_MIME_HEADER_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_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); + 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, ¶m); + if(idx < 0) return NULL; + return sk_MIME_PARAM_value(hdr->params, idx); +} + +static void mime_hdr_free(MIME_HEADER *hdr) +{ + if(hdr->name) OPENSSL_free(hdr->name); + if(hdr->value) OPENSSL_free(hdr->value); + if(hdr->params) sk_MIME_PARAM_pop_free(hdr->params, mime_param_free); + OPENSSL_free(hdr); +} + +static void mime_param_free(MIME_PARAM *param) +{ + if(param->param_name) OPENSSL_free(param->param_name); + if(param->param_value) OPENSSL_free(param->param_value); + OPENSSL_free(param); +} + +/* Check for a multipart boundary. Returns: + * 0 : no boundary + * 1 : part boundary + * 2 : final boundary + */ +static int mime_bound_check(char *line, int linelen, char *bound, int blen) +{ + if(linelen == -1) linelen = strlen(line); + if(blen == -1) blen = strlen(bound); + /* Quickly eliminate if line length too short */ + if(blen + 2 > linelen) return 0; + /* Check for part boundary */ + if(!strncmp(line, "--", 2) && !strncmp(line + 2, bound, blen)) { + if(!strncmp(line + blen + 2, "--", 2)) return 2; + else return 1; + } + return 0; +} + +static int strip_eol(char *linebuf, int *plen) + { + int len = *plen; + char *p, c; + int is_eol = 0; + p = linebuf + len - 1; + for (p = linebuf + len - 1; len > 0; len--, p--) + { + c = *p; + if (c == '\n') + is_eol = 1; + else if (c != '\r') + break; + } + *plen = len; + return is_eol; + } |