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134 lines
4.1 KiB
C
134 lines
4.1 KiB
C
/*-
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* SSLproxy - transparent SSL/TLS proxy
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*
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* Copyright (c) 2017-2024, Soner Tari <sonertari@gmail.com>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "protopop3.h"
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#include "protossl.h"
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#include "util.h"
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#include <string.h>
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// Size = 14
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static char *protopop3_commands[] = { "CAPA", "USER", "PASS", "AUTH", "APOP", "STLS", "LIST", "STAT", "UIDL", "RETR", "DELE", "RSET", "TOP", "QUIT", "NOOP" };
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static int NONNULL(1)
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protopop3_validate_command(char *packet, size_t packet_size
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#ifdef DEBUG_PROXY
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, pxy_conn_ctx_t *ctx
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#endif /* DEBUG_PROXY */
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)
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{
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size_t command_len = util_get_first_word_len(packet, packet_size);
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unsigned int i;
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for (i = 0; i < sizeof(protopop3_commands)/sizeof(char *); i++) {
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char *c = protopop3_commands[i];
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// We need case-insensitive comparison, and here it is safe to call strncasecmp()
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// with a non-string param packet, as we call it only if the lengths are the same
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if (strlen(c) == command_len && !strncasecmp(packet, c, command_len)) {
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log_finest_va("Passed command validation: %.*s", (int)packet_size, packet);
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return 0;
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}
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}
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return -1;
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}
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int
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protopop3_validate(pxy_conn_ctx_t *ctx, char *packet, size_t packet_size)
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{
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protopop3_ctx_t *pop3_ctx = ctx->protoctx->arg;
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if (pop3_ctx->not_valid) {
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log_finest("Not pop3, validation failed previously");
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return -1;
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}
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if (protopop3_validate_command(packet, packet_size
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#ifdef DEBUG_PROXY
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, ctx
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#endif /* DEBUG_PROXY */
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) == -1) {
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pop3_ctx->not_valid = 1;
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log_finest_va("Failed command validation: %.*s", (int)packet_size, packet);
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return -1;
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} else {
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pop3_ctx->seen_command_count++;
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}
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if (pop3_ctx->seen_command_count > 2) {
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ctx->protoctx->is_valid = 1;
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log_finest("Passed validation");
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}
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return 0;
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}
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// @attention Called by thrmgr thread
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protocol_t
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protopop3_setup(pxy_conn_ctx_t *ctx)
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{
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ctx->protoctx->proto = PROTO_POP3;
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ctx->protoctx->validatecb = protopop3_validate;
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ctx->protoctx->arg = malloc(sizeof(protopop3_ctx_t));
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if (!ctx->protoctx->arg) {
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return PROTO_ERROR;
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}
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memset(ctx->protoctx->arg, 0, sizeof(protopop3_ctx_t));
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return PROTO_POP3;
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}
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// @attention Called by thrmgr thread
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protocol_t
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protopop3s_setup(pxy_conn_ctx_t *ctx)
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{
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ctx->protoctx->proto = PROTO_POP3S;
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ctx->protoctx->connectcb = protossl_conn_connect;
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ctx->protoctx->init_conn = protossl_init_conn;
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ctx->protoctx->bev_eventcb = protossl_bev_eventcb;
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ctx->protoctx->proto_free = protossl_free;
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ctx->protoctx->validatecb = protopop3_validate;
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ctx->protoctx->arg = malloc(sizeof(protopop3_ctx_t));
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if (!ctx->protoctx->arg) {
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return PROTO_ERROR;
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}
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memset(ctx->protoctx->arg, 0, sizeof(protopop3_ctx_t));
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ctx->sslctx = malloc(sizeof(ssl_ctx_t));
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if (!ctx->sslctx) {
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free(ctx->protoctx->arg);
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return PROTO_ERROR;
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}
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memset(ctx->sslctx, 0, sizeof(ssl_ctx_t));
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return PROTO_POP3S;
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}
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/* vim: set noet ft=c: */
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