X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/e1d04f48a45c9f8e8ff75610003048f8ead73219..5800e3234f2594639d82e5063d9c522c6a881d25:/src/src/mime.c diff --git a/src/src/mime.c b/src/src/mime.c index 821cb541d..ddf923c25 100644 --- a/src/src/mime.c +++ b/src/src/mime.c @@ -2,9 +2,9 @@ * Exim - an Internet mail transport agent * *************************************************/ -/* Copyright (c) Tom Kistner 2004, 2015 +/* Copyright (c) Tom Kistner 2004 - 2015 * License: GPL - * Copyright (c) The Exim Maintainers 2016 + * Copyright (c) The Exim Maintainers 2015 - 2020 */ #include "exim.h" @@ -16,6 +16,7 @@ FILE *mime_stream = NULL; uschar *mime_current_boundary = NULL; static mime_header mime_header_list[] = { + /* name namelen value */ { US"content-type:", 13, &mime_content_type }, { US"content-disposition:", 20, &mime_content_disposition }, { US"content-transfer-encoding:", 26, &mime_content_transfer_encoding }, @@ -26,6 +27,7 @@ static mime_header mime_header_list[] = { static int mime_header_list_size = nelem(mime_header_list); static mime_parameter mime_parameter_list[] = { + /* name namelen value */ { US"name=", 5, &mime_filename }, { US"filename=", 9, &mime_filename }, { US"charset=", 8, &mime_charset }, @@ -105,23 +107,23 @@ return initial_pos; static ssize_t mime_decode_asis(FILE* in, FILE* out, uschar* boundary) { - ssize_t len, size = 0; - uschar buffer[MIME_MAX_LINE_LENGTH]; +ssize_t len, size = 0; +uschar buffer[MIME_MAX_LINE_LENGTH]; - while(fgets(CS buffer, MIME_MAX_LINE_LENGTH, mime_stream) != NULL) - { - if (boundary != NULL - && Ustrncmp(buffer, "--", 2) == 0 - && Ustrncmp((buffer+2), boundary, Ustrlen(boundary)) == 0 - ) - break; +while(fgets(CS buffer, MIME_MAX_LINE_LENGTH, mime_stream) != NULL) + { + if (boundary != NULL + && Ustrncmp(buffer, "--", 2) == 0 + && Ustrncmp((buffer+2), boundary, Ustrlen(boundary)) == 0 + ) + break; - len = Ustrlen(buffer); - if (fwrite(buffer, 1, (size_t)len, out) < len) - return -1; - size += len; - } /* while */ - return size; + len = Ustrlen(buffer); + if (fwrite(buffer, 1, (size_t)len, out) < len) + return -1; + size += len; + } /* while */ +return size; } @@ -157,24 +159,16 @@ while (fgets(CS ibuf, MIME_MAX_LINE_LENGTH, in) != NULL) { /* Error from decoder. ipos is unchanged. */ mime_set_anomaly(MIME_ANOMALY_BROKEN_QP); - *opos = '='; - ++opos; + *opos++ = '='; ++ipos; } else if (decode_qp_result == -1) break; else if (decode_qp_result >= 0) - { - *opos = decode_qp_result; - ++opos; - } + *opos++ = decode_qp_result; } else - { - *opos = *ipos; - ++opos; - ++ipos; - } + *opos++ = *ipos++; } /* something to write? */ len = opos - obuf; @@ -225,9 +219,8 @@ mime_decode(const uschar **listptr) { int sep = 0; const uschar *list = *listptr; -uschar *option; -uschar option_buffer[1024]; -uschar decode_path[1024]; +uschar * option; +uschar * decode_path; FILE *decode_file = NULL; long f_pos = 0; ssize_t size_counter = 0; @@ -237,12 +230,10 @@ if (!mime_stream || (f_pos = ftell(mime_stream)) < 0) return FAIL; /* build default decode path (will exist since MBOX must be spooled up) */ -(void)string_format(decode_path,1024,"%s/scan/%s",spool_directory,message_id); +decode_path = string_sprintf("%s/scan/%s", spool_directory, message_id); /* try to find 1st option */ -if ((option = string_nextinlist(&list, &sep, - option_buffer, - sizeof(option_buffer))) != NULL) +if ((option = string_nextinlist(&list, &sep, NULL, 0))) { /* parse 1st option */ if ((Ustrcmp(option,"false") == 0) || (Ustrcmp(option,"0") == 0)) @@ -347,17 +338,16 @@ while(!done) if ( ((c == '\t') || (c == ' ')) && (header_value_mode == 1) ) continue; - /* we have hit a non-whitespace char, start copying value data */ - header_value_mode = 2; + /* we have hit a non-whitespace char, start copying value data */ + header_value_mode = 2; - if (c == '"') /* flip "quoted" mode */ - header_value_mode = header_value_mode==2 ? 3 : 2; + if (c == '"') /* flip "quoted" mode */ + header_value_mode = header_value_mode==2 ? 3 : 2; - /* leave value mode on unquoted ';' */ - if (header_value_mode == 2 && c == ';') { - header_value_mode = 0; - }; - /* -------------------------------- */ + /* leave value mode on unquoted ';' */ + if (header_value_mode == 2 && c == ';') + header_value_mode = 0; + /* -------------------------------- */ } else { @@ -405,13 +395,11 @@ if ((num_copied > 0) && (header[num_copied-1] != ';')) header[num_copied] = '\0'; /* return 0 for EOF or empty line */ -if ((c == EOF) || (num_copied == 1)) - return 0; -else - return 1; +return c == EOF || num_copied == 1 ? 0 : 1; } +/* reset all per-part mime variables */ static void mime_vars_reset(void) { @@ -443,8 +431,7 @@ static uschar * mime_param_val(uschar ** sp) { uschar * s = *sp; -uschar * val = NULL; -int size = 0, ptr = 0; +gstring * val = NULL; /* debug_printf_indent(" considering paramval '%s'\n", s); */ @@ -453,14 +440,13 @@ while (*s && *s != ';') /* ; terminates */ { s++; /* skip opening " */ while (*s && *s != '"') /* " protects ; */ - val = string_catn(val, &size, &ptr, s++, 1); + val = string_catn(val, s++, 1); if (*s) s++; /* skip closing " */ } else - val = string_catn(val, &size, &ptr, s++, 1); -if (val) val[ptr] = '\0'; + val = string_catn(val, s++, 1); *sp = s; -return val; +return string_from_gstring(val); } static uschar * @@ -483,27 +469,26 @@ return s; static uschar * rfc2231_to_2047(const uschar * fname, const uschar * charset, int * len) { -int size = 0, ptr = 0; -uschar * val = string_catn(NULL, &size, &ptr, US"=?", 2); +gstring * val = string_catn(NULL, US"=?", 2); uschar c; if (charset) - val = string_cat(val, &size, &ptr, charset); -val = string_catn(val, &size, &ptr, US"?Q?", 3); + val = string_cat(val, charset); +val = string_catn(val, US"?Q?", 3); while ((c = *fname)) if (c == '%' && isxdigit(fname[1]) && isxdigit(fname[2])) { - val = string_catn(val, &size, &ptr, US"=", 1); - val = string_catn(val, &size, &ptr, ++fname, 2); + val = string_catn(val, US"=", 1); + val = string_catn(val, ++fname, 2); fname += 2; } else - val = string_catn(val, &size, &ptr, fname++, 1); + val = string_catn(val, fname++, 1); -val = string_catn(val, &size, &ptr, US"?=", 2); -val[*len = ptr] = '\0'; -return val; +val = string_catn(val, US"?=", 2); +*len = val->ptr; +return string_from_gstring(val); } @@ -515,8 +500,8 @@ int rc = OK; uschar * header = NULL; struct mime_boundary_context nested_context; -/* reserve a line buffer to work in */ -header = store_get(MIME_MAX_HEADER_SIZE+1); +/* reserve a line buffer to work in. Assume tainted data. */ +header = store_get(MIME_MAX_HEADER_SIZE+1, GET_TAINTED); /* Not actually used at the moment, but will be vital to fixing * some RFC 2046 nonconformance later... */ @@ -570,11 +555,9 @@ while(1) /* parse headers, set up expansion variables */ while (mime_get_header(f, header)) - { - struct mime_header * mh; /* look for interesting headers */ - for (mh = mime_header_list; + for (struct mime_header * mh = mime_header_list; mh < mime_header_list + mime_header_list_size; mh++) if (strncmpic(mh->name, header, mh->namelen) == 0) { @@ -602,8 +585,6 @@ while(1) while (*p) { - mime_parameter * mp; - DEBUG(D_acl) debug_printf_indent("MIME: considering paramlist '%s'\n", p); if ( !mime_filename @@ -659,9 +640,7 @@ while(1) NULL, &err_msg); DEBUG(D_acl) debug_printf_indent("MIME: plain-name %s\n", temp_string); - size = Ustrlen(temp_string); - - if (size == slen) + if (!temp_string || (size = Ustrlen(temp_string)) == slen) decoding_failed = TRUE; else /* build up a decoded filename over successive @@ -676,7 +655,7 @@ while(1) else /* look for interesting parameters */ - for (mp = mime_parameter_list; + for (mime_parameter * mp = mime_parameter_list; mp < mime_parameter_list + nelem(mime_parameter_list); mp++ ) if (strncmpic(mp->name, p, mp->namelen) == 0) @@ -716,7 +695,6 @@ while(1) } } } - } /* set additional flag variables (easier access) */ if ( mime_content_type @@ -748,9 +726,8 @@ while(1) if (rc != OK) break; /* If we have a multipart entity and a boundary, go recursive */ - if ( (mime_content_type != NULL) && - (nested_context.boundary != NULL) && - (Ustrncmp(mime_content_type,"multipart",9) == 0) ) + if ( mime_content_type && nested_context.boundary + && Ustrncmp(mime_content_type,"multipart",9) == 0) { DEBUG(D_acl) debug_printf_indent("MIME: Entering multipart recursion, boundary '%s'\n", @@ -767,25 +744,25 @@ while(1) rc = mime_acl_check(acl, f, &nested_context, user_msgptr, log_msgptr); if (rc != OK) break; } - else if ( (mime_content_type != NULL) && - (Ustrncmp(mime_content_type,"message/rfc822",14) == 0) ) + else if ( mime_content_type + && Ustrncmp(mime_content_type,"message/rfc822",14) == 0) { - const uschar *rfc822name = NULL; - uschar filename[2048]; + const uschar * rfc822name = NULL; + uschar * filename; int file_nr = 0; int result = 0; /* must find first free sequential filename */ - do + for (gstring * g = string_get(64); result != -1; g->ptr = 0) { struct stat mystat; - (void)string_format(filename, 2048, + g = string_fmt_append(g, "%s/scan/%s/__rfc822_%05u", spool_directory, message_id, file_nr++); /* security break */ if (file_nr >= 128) goto NO_RFC822; - result = stat(CS filename,&mystat); - } while (result != -1); + result = stat(CS (filename = string_from_gstring(g)), &mystat); + } rfc822name = filename;