- 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 = 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_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;
- 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) {
- if(first) {
- first = 0;
- if(bpart) sk_BIO_push(parts, 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_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;