X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=src%2Fnetwork.c;h=f4b87579dfda0c28b91ddb9a121b40103b478bf1;hb=0d5c879672770e3b8a740727fb223a6febdeaa27;hp=ef2ba1f6eb688b763df258ec98f890bb8b7080d4;hpb=6c4006c26484b1b28d59d4e65623b96ac0767919;p=collectd.git diff --git a/src/network.c b/src/network.c index ef2ba1f6..f4b87579 100644 --- a/src/network.c +++ b/src/network.c @@ -1,6 +1,7 @@ /** * collectd - src/network.c * Copyright (C) 2005-2009 Florian octo Forster + * Copyright (C) 2009 Aman Gupta * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the @@ -17,13 +18,18 @@ * * Authors: * Florian octo Forster + * Aman Gupta **/ +#define _BSD_SOURCE /* For struct ip_mreq */ + #include "collectd.h" #include "plugin.h" #include "common.h" #include "configfile.h" +#include "utils_fbhash.h" #include "utils_avltree.h" +#include "utils_cache.h" #include "network.h" @@ -46,13 +52,11 @@ # include #endif -#if HAVE_GCRYPT_H +#if HAVE_LIBGCRYPT # include +GCRY_THREAD_OPTION_PTHREAD_IMPL; #endif -/* 1500 - 40 - 8 = Ethernet packet - IPv6 header - UDP header */ -/* #define BUFF_SIZE 1452 */ - #ifndef IPV6_ADD_MEMBERSHIP # ifdef IPV6_JOIN_GROUP # define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP @@ -61,38 +65,66 @@ # endif #endif /* !IP_ADD_MEMBERSHIP */ -/* Buffer size to allocate. */ -#define BUFF_SIZE 1024 - /* * Maximum size required for encryption / signing: - * Type/length: 4 - * Hash/orig length: 32 - * Padding (up to): 16 - * -------------------- - * 52 + * + * 42 bytes for the encryption header + * + 64 bytes for the username + * ----------- + * = 106 bytes */ -#define BUFF_SIG_SIZE 52 +#define BUFF_SIG_SIZE 106 /* * Private data types */ -typedef struct sockent +#define SECURITY_LEVEL_NONE 0 +#if HAVE_LIBGCRYPT +# define SECURITY_LEVEL_SIGN 1 +# define SECURITY_LEVEL_ENCRYPT 2 +#endif +struct sockent_client { - int fd; + int fd; struct sockaddr_storage *addr; socklen_t addrlen; +#if HAVE_LIBGCRYPT + int security_level; + char *username; + char *password; + gcry_cipher_hd_t cypher; + unsigned char password_hash[32]; +#endif +}; -#define SECURITY_LEVEL_NONE 0 -#if HAVE_GCRYPT_H -# define SECURITY_LEVEL_SIGN 1 -# define SECURITY_LEVEL_ENCRYPT 2 +struct sockent_server +{ + int *fd; + size_t fd_num; +#if HAVE_LIBGCRYPT int security_level; - char *shared_secret; + char *auth_file; + fbhash_t *userdb; gcry_cipher_hd_t cypher; -#endif /* HAVE_GCRYPT_H */ +#endif +}; + +typedef struct sockent +{ +#define SOCKENT_TYPE_CLIENT 1 +#define SOCKENT_TYPE_SERVER 2 + int type; + + char *node; + char *service; + + union + { + struct sockent_client client; + struct sockent_server server; + } data; - struct sockent *next; + struct sockent *next; } sockent_t; /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3 @@ -161,25 +193,56 @@ struct part_values_s }; typedef struct part_values_s part_values_t; +/* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3 + * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 + * +-------------------------------+-------------------------------+ + * ! Type ! Length ! + * +-------------------------------+-------------------------------+ + * ! Hash (Bits 0 - 31) ! + * : : : + * ! Hash (Bits 224 - 255) ! + * +---------------------------------------------------------------+ + */ +/* Minimum size */ +#define PART_SIGNATURE_SHA256_SIZE 36 struct part_signature_sha256_s { part_header_t head; - char hash[32]; + unsigned char hash[32]; + char *username; }; typedef struct part_signature_sha256_s part_signature_sha256_t; +/* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3 + * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 + * +-------------------------------+-------------------------------+ + * ! Type ! Length ! + * +-------------------------------+-------------------------------+ + * ! Original length ! Padding (0 - 15 bytes) ! + * +-------------------------------+-------------------------------+ + * ! Hash (Bits 0 - 31) ! + * : : : + * ! Hash (Bits 128 - 159) ! + * +---------------------------------------------------------------+ + */ +/* Minimum size */ +#define PART_ENCRYPTION_AES256_SIZE 42 struct part_encryption_aes256_s { part_header_t head; - uint16_t orig_length; - uint16_t random; - char hash[28]; + uint16_t username_length; + char *username; + unsigned char iv[16]; + /* */ + unsigned char hash[20]; + /* */ + /* */ }; typedef struct part_encryption_aes256_s part_encryption_aes256_t; struct receive_list_entry_s { - char data[BUFF_SIZE]; + char *data; int data_len; int fd; struct receive_list_entry_s *next; @@ -189,11 +252,8 @@ typedef struct receive_list_entry_s receive_list_entry_t; /* * Private variables */ -#if HAVE_GCRYPT_H -static char network_encryption_iv[] = NET_ENCR_IV; -#endif /* HAVE_GCRYPT_H */ - static int network_config_ttl = 0; +static size_t network_config_packet_size = 1024; static int network_config_forward = 0; static sockent_t *sending_sockets = NULL; @@ -205,7 +265,7 @@ static pthread_cond_t receive_list_cond = PTHREAD_COND_INITIALIZER; static sockent_t *listen_sockets = NULL; static struct pollfd *listen_sockets_pollfd = NULL; -static int listen_sockets_num = 0; +static size_t listen_sockets_num = 0; /* The receive and dispatch threads will run as long as `listen_loop' is set to * zero. */ @@ -216,133 +276,181 @@ static int dispatch_thread_running = 0; static pthread_t dispatch_thread_id; /* Buffer in which to-be-sent network packets are constructed. */ -static char send_buffer[BUFF_SIZE]; +static char *send_buffer; static char *send_buffer_ptr; static int send_buffer_fill; static value_list_t send_buffer_vl = VALUE_LIST_STATIC; static pthread_mutex_t send_buffer_lock = PTHREAD_MUTEX_INITIALIZER; -/* In this cache we store all the values we received, so we can send out only - * those values which were *not* received via the network plugin, too. This is - * used for the `Forward false' option. */ -static c_avl_tree_t *cache_tree = NULL; -static pthread_mutex_t cache_lock = PTHREAD_MUTEX_INITIALIZER; -static time_t cache_flush_last = 0; -static int cache_flush_interval = 1800; - /* * Private functions */ -static int cache_flush (void) +static _Bool check_receive_okay (const value_list_t *vl) /* {{{ */ { - char **keys = NULL; - int keys_num = 0; + uint64_t time_sent = 0; + int status; - char **tmp; - int i; + status = uc_meta_data_get_unsigned_int (vl, + "network:time_sent", &time_sent); - char *key; - time_t *value; - c_avl_iterator_t *iter; + /* This is a value we already sent. Don't allow it to be received again in + * order to avoid looping. */ + if ((status == 0) && (time_sent >= ((uint64_t) vl->time))) + return (false); - time_t curtime = time (NULL); + return (true); +} /* }}} _Bool check_receive_okay */ - iter = c_avl_get_iterator (cache_tree); - while (c_avl_iterator_next (iter, (void *) &key, (void *) &value) == 0) - { - if ((curtime - *value) <= cache_flush_interval) - continue; - tmp = (char **) realloc (keys, - (keys_num + 1) * sizeof (char *)); - if (tmp == NULL) - { - sfree (keys); - c_avl_iterator_destroy (iter); - ERROR ("network plugin: cache_flush: realloc" - " failed."); - return (-1); - } - keys = tmp; - keys[keys_num] = key; - keys_num++; - } /* while (c_avl_iterator_next) */ - c_avl_iterator_destroy (iter); +static _Bool check_send_okay (const value_list_t *vl) /* {{{ */ +{ + _Bool received = false; + int status; - for (i = 0; i < keys_num; i++) - { - if (c_avl_remove (cache_tree, keys[i], (void *) &key, - (void *) &value) != 0) - { - WARNING ("network plugin: cache_flush: c_avl_remove" - " (%s) failed.", keys[i]); - continue; - } + if (network_config_forward != 0) + return (true); - sfree (key); - sfree (value); - } + if (vl->meta == NULL) + return (true); - sfree (keys); + status = meta_data_get_boolean (vl->meta, "network:received", &received); + if (status == -ENOENT) + return (true); + else if (status != 0) + { + ERROR ("network plugin: check_send_okay: meta_data_get_boolean failed " + "with status %i.", status); + return (true); + } - DEBUG ("network plugin: cache_flush: Removed %i %s", - keys_num, (keys_num == 1) ? "entry" : "entries"); - cache_flush_last = curtime; - return (0); -} /* int cache_flush */ + /* By default, only *send* value lists that were not *received* by the + * network plugin. */ + return (!received); +} /* }}} _Bool check_send_okay */ -static int cache_check (const value_list_t *vl) +static int network_dispatch_values (value_list_t *vl) /* {{{ */ { - char key[1024]; - time_t *value = NULL; - int retval = -1; + int status; - if (cache_tree == NULL) - return (-1); + if ((vl->time <= 0) + || (strlen (vl->host) <= 0) + || (strlen (vl->plugin) <= 0) + || (strlen (vl->type) <= 0)) + return (-EINVAL); - if (format_name (key, sizeof (key), vl->host, vl->plugin, - vl->plugin_instance, vl->type, vl->type_instance)) - return (-1); + if (!check_receive_okay (vl)) + { +#if COLLECT_DEBUG + char name[6*DATA_MAX_NAME_LEN]; + FORMAT_VL (name, sizeof (name), vl); + name[sizeof (name) - 1] = 0; + DEBUG ("network plugin: network_dispatch_values: " + "NOT dispatching %s.", name); +#endif + return (0); + } - pthread_mutex_lock (&cache_lock); + assert (vl->meta == NULL); - if (c_avl_get (cache_tree, key, (void *) &value) == 0) - { - if (*value < vl->time) - { - *value = vl->time; - retval = 0; - } - else - { - DEBUG ("network plugin: cache_check: *value = %i >= vl->time = %i", - (int) *value, (int) vl->time); - retval = 1; - } - } - else - { - char *key_copy = strdup (key); - value = malloc (sizeof (time_t)); - if ((key_copy != NULL) && (value != NULL)) - { - *value = vl->time; - c_avl_insert (cache_tree, key_copy, value); - retval = 0; - } - else - { - sfree (key_copy); - sfree (value); - } - } + vl->meta = meta_data_create (); + if (vl->meta == NULL) + { + ERROR ("network plugin: meta_data_create failed."); + return (-ENOMEM); + } + + status = meta_data_add_boolean (vl->meta, "network:received", true); + if (status != 0) + { + ERROR ("network plugin: meta_data_add_boolean failed."); + meta_data_destroy (vl->meta); + vl->meta = NULL; + return (status); + } + + plugin_dispatch_values (vl); + + meta_data_destroy (vl->meta); + vl->meta = NULL; + + return (0); +} /* }}} int network_dispatch_values */ + +#if HAVE_LIBGCRYPT +static gcry_cipher_hd_t network_get_aes256_cypher (sockent_t *se, /* {{{ */ + const void *iv, size_t iv_size, const char *username) +{ + gcry_error_t err; + gcry_cipher_hd_t *cyper_ptr; + unsigned char password_hash[32]; + + if (se->type == SOCKENT_TYPE_CLIENT) + { + cyper_ptr = &se->data.client.cypher; + memcpy (password_hash, se->data.client.password_hash, + sizeof (password_hash)); + } + else + { + char *secret; + + cyper_ptr = &se->data.server.cypher; + + if (username == NULL) + return (NULL); + + secret = fbh_get (se->data.server.userdb, username); + if (secret == NULL) + return (NULL); + + gcry_md_hash_buffer (GCRY_MD_SHA256, + password_hash, + secret, strlen (secret)); + + sfree (secret); + } + + if (*cyper_ptr == NULL) + { + err = gcry_cipher_open (cyper_ptr, + GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_OFB, /* flags = */ 0); + if (err != 0) + { + ERROR ("network plugin: gcry_cipher_open returned: %s", + gcry_strerror (err)); + *cyper_ptr = NULL; + return (NULL); + } + } + else + { + gcry_cipher_reset (*cyper_ptr); + } + assert (*cyper_ptr != NULL); - if ((time (NULL) - cache_flush_last) > cache_flush_interval) - cache_flush (); + err = gcry_cipher_setkey (*cyper_ptr, + password_hash, sizeof (password_hash)); + if (err != 0) + { + ERROR ("network plugin: gcry_cipher_setkey returned: %s", + gcry_strerror (err)); + gcry_cipher_close (*cyper_ptr); + *cyper_ptr = NULL; + return (NULL); + } - pthread_mutex_unlock (&cache_lock); + err = gcry_cipher_setiv (*cyper_ptr, iv, iv_size); + if (err != 0) + { + ERROR ("network plugin: gcry_cipher_setkey returned: %s", + gcry_strerror (err)); + gcry_cipher_close (*cyper_ptr); + *cyper_ptr = NULL; + return (NULL); + } - return (retval); -} /* int cache_check */ + return (*cyper_ptr); +} /* }}} int network_get_aes256_cypher */ +#endif /* HAVE_LIBGCRYPT */ static int write_part_values (char **ret_buffer, int *ret_buffer_len, const data_set_t *ds, const value_list_t *vl) @@ -389,17 +497,34 @@ static int write_part_values (char **ret_buffer, int *ret_buffer_len, for (i = 0; i < num_values; i++) { - if (ds->ds[i].type == DS_TYPE_COUNTER) - { - pkg_values_types[i] = DS_TYPE_COUNTER; - pkg_values[i].counter = htonll (vl->values[i].counter); - } - else + pkg_values_types[i] = (uint8_t) ds->ds[i].type; + switch (ds->ds[i].type) { - pkg_values_types[i] = DS_TYPE_GAUGE; - pkg_values[i].gauge = htond (vl->values[i].gauge); - } - } + case DS_TYPE_COUNTER: + pkg_values[i].counter = htonll (vl->values[i].counter); + break; + + case DS_TYPE_GAUGE: + pkg_values[i].gauge = htond (vl->values[i].gauge); + break; + + case DS_TYPE_DERIVE: + pkg_values[i].derive = htonll (vl->values[i].derive); + break; + + case DS_TYPE_ABSOLUTE: + pkg_values[i].absolute = htonll (vl->values[i].absolute); + break; + + default: + free (pkg_values_types); + free (pkg_values); + ERROR ("network plugin: write_part_values: " + "Unknown data source type: %i", + ds->ds[i].type); + return (-1); + } /* switch (ds->ds[i].type) */ + } /* for (num_values) */ /* * Use `memcpy' to write everything to the buffer, because the pointer @@ -500,11 +625,11 @@ static int write_part_string (char **ret_buffer, int *ret_buffer_len, return (0); } /* int write_part_string */ -static int parse_part_values (void **ret_buffer, int *ret_buffer_len, +static int parse_part_values (void **ret_buffer, size_t *ret_buffer_len, value_t **ret_values, int *ret_num_values) { char *buffer = *ret_buffer; - int buffer_len = *ret_buffer_len; + size_t buffer_len = *ret_buffer_len; uint16_t tmp16; size_t exp_size; @@ -517,10 +642,10 @@ static int parse_part_values (void **ret_buffer, int *ret_buffer_len, uint8_t *pkg_types; value_t *pkg_values; - if (buffer_len < (15)) + if (buffer_len < 15) { - DEBUG ("network plugin: packet is too short: buffer_len = %i", - buffer_len); + NOTICE ("network plugin: packet is too short: " + "buffer_len = %zu", buffer_len); return (-1); } @@ -540,13 +665,13 @@ static int parse_part_values (void **ret_buffer, int *ret_buffer_len, exp_size = 3 * sizeof (uint16_t) + pkg_numval * (sizeof (uint8_t) + sizeof (value_t)); - if ((buffer_len < 0) || ((size_t) buffer_len < exp_size)) + if ((buffer_len < 0) || (buffer_len < exp_size)) { WARNING ("network plugin: parse_part_values: " "Packet too short: " - "Chunk of size %u expected, " - "but buffer has only %i bytes left.", - (unsigned int) exp_size, buffer_len); + "Chunk of size %zu expected, " + "but buffer has only %zu bytes left.", + exp_size, buffer_len); return (-1); } @@ -575,10 +700,32 @@ static int parse_part_values (void **ret_buffer, int *ret_buffer_len, for (i = 0; i < pkg_numval; i++) { - if (pkg_types[i] == DS_TYPE_COUNTER) - pkg_values[i].counter = ntohll (pkg_values[i].counter); - else if (pkg_types[i] == DS_TYPE_GAUGE) - pkg_values[i].gauge = ntohd (pkg_values[i].gauge); + switch (pkg_types[i]) + { + case DS_TYPE_COUNTER: + pkg_values[i].counter = (counter_t) ntohll (pkg_values[i].counter); + break; + + case DS_TYPE_GAUGE: + pkg_values[i].gauge = (gauge_t) ntohd (pkg_values[i].gauge); + break; + + case DS_TYPE_DERIVE: + pkg_values[i].derive = (derive_t) ntohll (pkg_values[i].derive); + break; + + case DS_TYPE_ABSOLUTE: + pkg_values[i].absolute = (absolute_t) ntohll (pkg_values[i].absolute); + break; + + default: + sfree (pkg_types); + sfree (pkg_values); + NOTICE ("network plugin: parse_part_values: " + "Don't know how to handle data source type %"PRIu8, + pkg_types[i]); + return (-1); + } /* switch (pkg_types[i]) */ } *ret_buffer = buffer; @@ -591,11 +738,11 @@ static int parse_part_values (void **ret_buffer, int *ret_buffer_len, return (0); } /* int parse_part_values */ -static int parse_part_number (void **ret_buffer, int *ret_buffer_len, +static int parse_part_number (void **ret_buffer, size_t *ret_buffer_len, uint64_t *value) { char *buffer = *ret_buffer; - int buffer_len = *ret_buffer_len; + size_t buffer_len = *ret_buffer_len; uint16_t tmp16; uint64_t tmp64; @@ -608,9 +755,9 @@ static int parse_part_number (void **ret_buffer, int *ret_buffer_len, { WARNING ("network plugin: parse_part_number: " "Packet too short: " - "Chunk of size %u expected, " - "but buffer has only %i bytes left.", - (unsigned int) exp_size, buffer_len); + "Chunk of size %zu expected, " + "but buffer has only %zu bytes left.", + exp_size, buffer_len); return (-1); } @@ -632,11 +779,11 @@ static int parse_part_number (void **ret_buffer, int *ret_buffer_len, return (0); } /* int parse_part_number */ -static int parse_part_string (void **ret_buffer, int *ret_buffer_len, +static int parse_part_string (void **ret_buffer, size_t *ret_buffer_len, char *output, int output_len) { char *buffer = *ret_buffer; - int buffer_len = *ret_buffer_len; + size_t buffer_len = *ret_buffer_len; uint16_t tmp16; size_t header_size = 2 * sizeof (uint16_t); @@ -644,13 +791,13 @@ static int parse_part_string (void **ret_buffer, int *ret_buffer_len, uint16_t pkg_length; uint16_t pkg_type; - if ((buffer_len < 0) || ((size_t) buffer_len < header_size)) + if ((buffer_len < 0) || (buffer_len < header_size)) { WARNING ("network plugin: parse_part_string: " "Packet too short: " - "Chunk of at least size %u expected, " - "but buffer has only %i bytes left.", - (unsigned int) header_size, buffer_len); + "Chunk of at least size %zu expected, " + "but buffer has only %zu bytes left.", + header_size, buffer_len); return (-1); } @@ -667,8 +814,8 @@ static int parse_part_string (void **ret_buffer, int *ret_buffer_len, { WARNING ("network plugin: parse_part_string: " "Packet too big: " - "Chunk of size %hu received, " - "but buffer has only %i bytes left.", + "Chunk of size %"PRIu16" received, " + "but buffer has only %zu bytes left.", pkg_length, buffer_len); return (-1); } @@ -715,78 +862,272 @@ static int parse_part_string (void **ret_buffer, int *ret_buffer_len, return (0); } /* int parse_part_string */ -#if HAVE_GCRYPT_H +/* Forward declaration: parse_part_sign_sha256 and parse_part_encr_aes256 call + * parse_packet and vice versa. */ +#define PP_SIGNED 0x01 +#define PP_ENCRYPTED 0x02 +static int parse_packet (sockent_t *se, + void *buffer, size_t buffer_size, int flags); + +#define BUFFER_READ(p,s) do { \ + memcpy ((p), buffer + buffer_offset, (s)); \ + buffer_offset += (s); \ +} while (0) + +#if HAVE_LIBGCRYPT static int parse_part_sign_sha256 (sockent_t *se, /* {{{ */ - void **ret_buffer, int *ret_buffer_len) + void **ret_buffer, size_t *ret_buffer_len, int flags) { - char *buffer = *ret_buffer; - size_t buffer_len = (size_t) *ret_buffer_len; + char *buffer; + size_t buffer_len; + size_t buffer_offset; + + size_t username_len; + char *secret; + + part_signature_sha256_t pss; + uint16_t pss_head_length; + char hash[sizeof (pss.hash)]; + + gcry_md_hd_t hd; + gcry_error_t err; + unsigned char *hash_ptr; - part_signature_sha256_t ps_received; - part_signature_sha256_t ps_expected; + buffer = *ret_buffer; + buffer_len = *ret_buffer_len; + buffer_offset = 0; - if (se->shared_secret == NULL) + if (se->data.server.userdb == NULL) { NOTICE ("network plugin: Received signed network packet but can't verify " - "it because no shared secret has been configured. Will accept it."); + "it because no user DB has been configured. Will accept it."); return (0); } - if (buffer_len < sizeof (ps_received)) + /* Check if the buffer has enough data for this structure. */ + if (buffer_len <= PART_SIGNATURE_SHA256_SIZE) + return (-ENOMEM); + + /* Read type and length header */ + BUFFER_READ (&pss.head.type, sizeof (pss.head.type)); + BUFFER_READ (&pss.head.length, sizeof (pss.head.length)); + pss_head_length = ntohs (pss.head.length); + + /* Check if the `pss_head_length' is within bounds. */ + if ((pss_head_length <= PART_SIGNATURE_SHA256_SIZE) + || (pss_head_length > buffer_len)) + { + ERROR ("network plugin: HMAC-SHA-256 with invalid length received."); + return (-1); + } + + /* Copy the hash. */ + BUFFER_READ (pss.hash, sizeof (pss.hash)); + + /* Calculate username length (without null byte) and allocate memory */ + username_len = pss_head_length - PART_SIGNATURE_SHA256_SIZE; + pss.username = malloc (username_len + 1); + if (pss.username == NULL) return (-ENOMEM); - memcpy (&ps_received, buffer, sizeof (ps_received)); + /* Read the username */ + BUFFER_READ (pss.username, username_len); + pss.username[username_len] = 0; - memset (&ps_expected, 0, sizeof (ps_expected)); - ps_expected.head.type = htons (TYPE_SIGN_SHA256); - ps_expected.head.length = htons (sizeof (ps_expected)); - sstrncpy (ps_expected.hash, se->shared_secret, sizeof (ps_expected.hash)); - memcpy (buffer, &ps_expected, sizeof (ps_expected)); + assert (buffer_offset == pss_head_length); - gcry_md_hash_buffer (GCRY_MD_SHA256, ps_expected.hash, buffer, buffer_len); + /* Query the password */ + secret = fbh_get (se->data.server.userdb, pss.username); + if (secret == NULL) + { + ERROR ("network plugin: Unknown user: %s", pss.username); + sfree (pss.username); + return (-ENOENT); + } - *ret_buffer += sizeof (ps_received); + /* Create a hash device and check the HMAC */ + hd = NULL; + err = gcry_md_open (&hd, GCRY_MD_SHA256, GCRY_MD_FLAG_HMAC); + if (err != 0) + { + ERROR ("network plugin: Creating HMAC-SHA-256 object failed: %s", + gcry_strerror (err)); + sfree (secret); + sfree (pss.username); + return (-1); + } - if (memcmp (ps_received.hash, ps_expected.hash, - sizeof (ps_received.hash)) == 0) - return (0); - else /* hashes do not match. */ - return (1); + err = gcry_md_setkey (hd, secret, strlen (secret)); + if (err != 0) + { + ERROR ("network plugin: gcry_md_setkey failed: %s", gcry_strerror (err)); + gcry_md_close (hd); + return (-1); + } + + gcry_md_write (hd, + buffer + PART_SIGNATURE_SHA256_SIZE, + buffer_len - PART_SIGNATURE_SHA256_SIZE); + hash_ptr = gcry_md_read (hd, GCRY_MD_SHA256); + if (hash_ptr == NULL) + { + ERROR ("network plugin: gcry_md_read failed."); + gcry_md_close (hd); + sfree (secret); + sfree (pss.username); + return (-1); + } + memcpy (hash, hash_ptr, sizeof (hash)); + + /* Clean up */ + gcry_md_close (hd); + hd = NULL; + + sfree (secret); + sfree (pss.username); + + if (memcmp (pss.hash, hash, sizeof (pss.hash)) != 0) + { + WARNING ("network plugin: Verifying HMAC-SHA-256 signature failed: " + "Hash mismatch."); + } + else + { + parse_packet (se, buffer + buffer_offset, buffer_len - buffer_offset, + flags | PP_SIGNED); + } + + *ret_buffer = buffer + buffer_len; + *ret_buffer_len = 0; + + return (0); } /* }}} int parse_part_sign_sha256 */ -/* #endif HAVE_GCRYPT_H */ +/* #endif HAVE_LIBGCRYPT */ -#else /* if !HAVE_GCRYPT_H */ +#else /* if !HAVE_LIBGCRYPT */ static int parse_part_sign_sha256 (sockent_t *se, /* {{{ */ - void **ret_buffer, int *ret_buffer_len) + void **ret_buffer, size_t *ret_buffer_size, int flags) { - INFO ("network plugin: Received signed packet, but the network " - "plugin was not linked with libgcrypt, so I cannot " - "verify the signature. The packet will be accepted."); + static int warning_has_been_printed = 0; + + char *buffer; + size_t buffer_size; + size_t buffer_offset; + uint16_t part_len; + + part_signature_sha256_t pss; + + buffer = *ret_buffer; + buffer_size = *ret_buffer_size; + buffer_offset = 0; + + if (buffer_size <= PART_SIGNATURE_SHA256_SIZE) + return (-ENOMEM); + + BUFFER_READ (&pss.head.type, sizeof (pss.head.type)); + BUFFER_READ (&pss.head.length, sizeof (pss.head.length)); + part_len = ntohs (pss.head.length); + + if ((part_len <= PART_SIGNATURE_SHA256_SIZE) + || (part_len > buffer_size)) + return (-EINVAL); + + if (warning_has_been_printed == 0) + { + WARNING ("network plugin: Received signed packet, but the network " + "plugin was not linked with libgcrypt, so I cannot " + "verify the signature. The packet will be accepted."); + warning_has_been_printed = 1; + } + + parse_packet (se, buffer + part_len, buffer_size - part_len, flags); + + *ret_buffer = buffer + buffer_size; + *ret_buffer_size = 0; + return (0); } /* }}} int parse_part_sign_sha256 */ -#endif /* !HAVE_GCRYPT_H */ +#endif /* !HAVE_LIBGCRYPT */ -#if HAVE_GCRYPT_H +#if HAVE_LIBGCRYPT static int parse_part_encr_aes256 (sockent_t *se, /* {{{ */ - void **ret_buffer, int *ret_buffer_len) + void **ret_buffer, size_t *ret_buffer_len, + int flags) { - char *buffer = *ret_buffer; - int buffer_len = *ret_buffer_len; - int orig_buffer_len; + char *buffer = *ret_buffer; + size_t buffer_len = *ret_buffer_len; + size_t payload_len; + size_t part_size; + size_t buffer_offset; + uint16_t username_len; part_encryption_aes256_t pea; - char hash[28]; + unsigned char hash[sizeof (pea.hash)]; + + gcry_cipher_hd_t cypher; gcry_error_t err; - if (se->cypher == NULL) + /* Make sure at least the header if available. */ + if (buffer_len <= PART_ENCRYPTION_AES256_SIZE) { - NOTICE ("network plugin: Unable to decrypt packet, because no cypher " - "instance is present."); + NOTICE ("network plugin: parse_part_encr_aes256: " + "Discarding short packet."); return (-1); } + buffer_offset = 0; + + /* Copy the unencrypted information into `pea'. */ + BUFFER_READ (&pea.head.type, sizeof (pea.head.type)); + BUFFER_READ (&pea.head.length, sizeof (pea.head.length)); + + /* Check the `part size'. */ + part_size = ntohs (pea.head.length); + if ((part_size <= PART_ENCRYPTION_AES256_SIZE) + || (part_size > buffer_len)) + { + NOTICE ("network plugin: parse_part_encr_aes256: " + "Discarding part with invalid size."); + return (-1); + } + + /* Read the username */ + BUFFER_READ (&username_len, sizeof (username_len)); + username_len = ntohs (username_len); + + if ((username_len <= 0) + || (username_len > (part_size - (PART_ENCRYPTION_AES256_SIZE + 1)))) + { + NOTICE ("network plugin: parse_part_encr_aes256: " + "Discarding part with invalid username length."); + return (-1); + } + + assert (username_len > 0); + pea.username = malloc (username_len + 1); + if (pea.username == NULL) + return (-ENOMEM); + BUFFER_READ (pea.username, username_len); + pea.username[username_len] = 0; + + /* Last but not least, the initialization vector */ + BUFFER_READ (pea.iv, sizeof (pea.iv)); + + /* Make sure we are at the right position */ + assert (buffer_offset == (username_len + + PART_ENCRYPTION_AES256_SIZE - sizeof (pea.hash))); + + cypher = network_get_aes256_cypher (se, pea.iv, sizeof (pea.iv), + pea.username); + if (cypher == NULL) + return (-1); + + payload_len = part_size - (PART_ENCRYPTION_AES256_SIZE + username_len); + assert (payload_len > 0); + /* Decrypt the packet in-place */ - err = gcry_cipher_decrypt (se->cypher, - buffer + sizeof (pea.head), buffer_len - sizeof (pea.head), + err = gcry_cipher_decrypt (cypher, + buffer + buffer_offset, + part_size - buffer_offset, /* in = */ NULL, /* in len = */ 0); if (err != 0) { @@ -795,87 +1136,104 @@ static int parse_part_encr_aes256 (sockent_t *se, /* {{{ */ return (-1); } - /* Copy the header information to `pea' */ - memcpy (&pea, buffer, sizeof (pea)); - buffer += sizeof (pea); - buffer_len -= sizeof (pea); + /* Read the hash */ + BUFFER_READ (pea.hash, sizeof (pea.hash)); - /* Check sanity of the original length */ - orig_buffer_len = ntohs (pea.orig_length); - if (orig_buffer_len > buffer_len) - { - ERROR ("network plugin: Decryption failed: Invalid original length."); - return (-1); - } + /* Make sure we're at the right position - again */ + assert (buffer_offset == (username_len + PART_ENCRYPTION_AES256_SIZE)); + assert (buffer_offset == (part_size - payload_len)); /* Check hash sum */ memset (hash, 0, sizeof (hash)); - gcry_md_hash_buffer (GCRY_MD_SHA224, hash, buffer, orig_buffer_len); - + gcry_md_hash_buffer (GCRY_MD_SHA1, hash, + buffer + buffer_offset, payload_len); if (memcmp (hash, pea.hash, sizeof (hash)) != 0) { ERROR ("network plugin: Decryption failed: Checksum mismatch."); return (-1); } + parse_packet (se, buffer + buffer_offset, payload_len, + flags | PP_ENCRYPTED); + /* Update return values */ - *ret_buffer = buffer; - *ret_buffer_len = orig_buffer_len; + *ret_buffer = buffer + part_size; + *ret_buffer_len = buffer_len - part_size; return (0); } /* }}} int parse_part_encr_aes256 */ -/* #endif HAVE_GCRYPT_H */ +/* #endif HAVE_LIBGCRYPT */ -#else /* if !HAVE_GCRYPT_H */ +#else /* if !HAVE_LIBGCRYPT */ static int parse_part_encr_aes256 (sockent_t *se, /* {{{ */ - void **ret_buffer, int *ret_buffer_len) + void **ret_buffer, size_t *ret_buffer_size, int flags) { - INFO ("network plugin: Received encrypted packet, but the network " - "plugin was not linked with libgcrypt, so I cannot " - "decrypt it. The packet will be discarded."); - return (-1); + static int warning_has_been_printed = 0; + + char *buffer; + size_t buffer_size; + size_t buffer_offset; + + part_header_t ph; + size_t ph_length; + + buffer = *ret_buffer; + buffer_size = *ret_buffer_size; + buffer_offset = 0; + + /* parse_packet assures this minimum size. */ + assert (buffer_size >= (sizeof (ph.type) + sizeof (ph.length))); + + BUFFER_READ (&ph.type, sizeof (ph.type)); + BUFFER_READ (&ph.length, sizeof (ph.length)); + ph_length = ntohs (ph.length); + + if ((ph_length <= PART_ENCRYPTION_AES256_SIZE) + || (ph_length > buffer_size)) + { + ERROR ("network plugin: AES-256 encrypted part " + "with invalid length received."); + return (-1); + } + + if (warning_has_been_printed == 0) + { + WARNING ("network plugin: Received encrypted packet, but the network " + "plugin was not linked with libgcrypt, so I cannot " + "decrypt it. The part will be discarded."); + warning_has_been_printed = 1; + } + + *ret_buffer += ph_length; + *ret_buffer_size -= ph_length; + + return (0); } /* }}} int parse_part_encr_aes256 */ -#endif /* !HAVE_GCRYPT_H */ +#endif /* !HAVE_LIBGCRYPT */ -static int parse_packet (receive_list_entry_t *rle) /* {{{ */ +#undef BUFFER_READ + +static int parse_packet (sockent_t *se, /* {{{ */ + void *buffer, size_t buffer_size, int flags) { int status; - void *buffer; - int buffer_len; - sockent_t *se; - value_list_t vl = VALUE_LIST_INIT; notification_t n; - int packet_was_encrypted = 0; - int packet_was_signed = 0; -#if HAVE_GCRYPT_H +#if HAVE_LIBGCRYPT + int packet_was_signed = (flags & PP_SIGNED); + int packet_was_encrypted = (flags & PP_ENCRYPTED); int printed_ignore_warning = 0; -#endif /* HAVE_GCRYPT_H */ - - buffer = rle->data; - buffer_len = rle->data_len; +#endif /* HAVE_LIBGCRYPT */ - /* Look for the correct `sockent_t' */ - se = listen_sockets; - while ((se != NULL) && (se->fd != rle->fd)) - se = se->next; - - if (se == NULL) - { - ERROR ("network plugin: Got packet from FD %i, but can't " - "find an appropriate socket entry.", - rle->fd); - return (-1); - } memset (&vl, '\0', sizeof (vl)); memset (&n, '\0', sizeof (n)); status = 0; - while ((status == 0) && (0 < buffer_len) - && ((unsigned int) buffer_len > sizeof (part_header_t))) + while ((status == 0) && (0 < buffer_size) + && ((unsigned int) buffer_size > sizeof (part_header_t))) { uint16_t pkg_length; uint16_t pkg_type; @@ -890,7 +1248,7 @@ static int parse_packet (receive_list_entry_t *rle) /* {{{ */ pkg_length = ntohs (pkg_length); pkg_type = ntohs (pkg_type); - if (pkg_length > buffer_len) + if (pkg_length > buffer_size) break; /* Ensure that this loop terminates eventually */ if (pkg_length < (2 * sizeof (uint16_t))) @@ -898,7 +1256,8 @@ static int parse_packet (receive_list_entry_t *rle) /* {{{ */ if (pkg_type == TYPE_ENCR_AES256) { - status = parse_part_encr_aes256 (se, &buffer, &buffer_len); + status = parse_part_encr_aes256 (se, + &buffer, &buffer_size, flags); if (status != 0) { ERROR ("network plugin: Decrypting AES256 " @@ -906,13 +1265,9 @@ static int parse_packet (receive_list_entry_t *rle) /* {{{ */ "with status %i.", status); break; } - else - { - packet_was_encrypted = 1; - } } -#if HAVE_GCRYPT_H - else if ((se->security_level == SECURITY_LEVEL_ENCRYPT) +#if HAVE_LIBGCRYPT + else if ((se->data.server.security_level == SECURITY_LEVEL_ENCRYPT) && (packet_was_encrypted == 0)) { if (printed_ignore_warning == 0) @@ -924,30 +1279,21 @@ static int parse_packet (receive_list_entry_t *rle) /* {{{ */ buffer = ((char *) buffer) + pkg_length; continue; } -#endif /* HAVE_GCRYPT_H */ +#endif /* HAVE_LIBGCRYPT */ else if (pkg_type == TYPE_SIGN_SHA256) { - status = parse_part_sign_sha256 (se, &buffer, &buffer_len); - if (status < 0) + status = parse_part_sign_sha256 (se, + &buffer, &buffer_size, flags); + if (status != 0) { - ERROR ("network plugin: Verifying SHA-256 " + ERROR ("network plugin: Verifying HMAC-SHA-256 " "signature failed " "with status %i.", status); break; } - else if (status > 0) - { - ERROR ("network plugin: Ignoring packet with " - "invalid SHA-256 signature."); - break; - } - else - { - packet_was_signed = 1; - } } -#if HAVE_GCRYPT_H - else if ((se->security_level == SECURITY_LEVEL_SIGN) +#if HAVE_LIBGCRYPT + else if ((se->data.server.security_level == SECURITY_LEVEL_SIGN) && (packet_was_encrypted == 0) && (packet_was_signed == 0)) { @@ -960,35 +1306,22 @@ static int parse_packet (receive_list_entry_t *rle) /* {{{ */ buffer = ((char *) buffer) + pkg_length; continue; } -#endif /* HAVE_GCRYPT_H */ +#endif /* HAVE_LIBGCRYPT */ else if (pkg_type == TYPE_VALUES) { - status = parse_part_values (&buffer, &buffer_len, + status = parse_part_values (&buffer, &buffer_size, &vl.values, &vl.values_len); - if (status != 0) break; - if ((vl.time > 0) - && (strlen (vl.host) > 0) - && (strlen (vl.plugin) > 0) - && (strlen (vl.type) > 0) - && (cache_check (&vl) == 0)) - { - plugin_dispatch_values (&vl); - } - else - { - DEBUG ("network plugin: parse_packet:" - " NOT dispatching values"); - } + network_dispatch_values (&vl); sfree (vl.values); } else if (pkg_type == TYPE_TIME) { uint64_t tmp = 0; - status = parse_part_number (&buffer, &buffer_len, + status = parse_part_number (&buffer, &buffer_size, &tmp); if (status == 0) { @@ -999,21 +1332,21 @@ static int parse_packet (receive_list_entry_t *rle) /* {{{ */ else if (pkg_type == TYPE_INTERVAL) { uint64_t tmp = 0; - status = parse_part_number (&buffer, &buffer_len, + status = parse_part_number (&buffer, &buffer_size, &tmp); if (status == 0) vl.interval = (int) tmp; } else if (pkg_type == TYPE_HOST) { - status = parse_part_string (&buffer, &buffer_len, + status = parse_part_string (&buffer, &buffer_size, vl.host, sizeof (vl.host)); if (status == 0) sstrncpy (n.host, vl.host, sizeof (n.host)); } else if (pkg_type == TYPE_PLUGIN) { - status = parse_part_string (&buffer, &buffer_len, + status = parse_part_string (&buffer, &buffer_size, vl.plugin, sizeof (vl.plugin)); if (status == 0) sstrncpy (n.plugin, vl.plugin, @@ -1021,7 +1354,7 @@ static int parse_packet (receive_list_entry_t *rle) /* {{{ */ } else if (pkg_type == TYPE_PLUGIN_INSTANCE) { - status = parse_part_string (&buffer, &buffer_len, + status = parse_part_string (&buffer, &buffer_size, vl.plugin_instance, sizeof (vl.plugin_instance)); if (status == 0) @@ -1031,14 +1364,14 @@ static int parse_packet (receive_list_entry_t *rle) /* {{{ */ } else if (pkg_type == TYPE_TYPE) { - status = parse_part_string (&buffer, &buffer_len, + status = parse_part_string (&buffer, &buffer_size, vl.type, sizeof (vl.type)); if (status == 0) sstrncpy (n.type, vl.type, sizeof (n.type)); } else if (pkg_type == TYPE_TYPE_INSTANCE) { - status = parse_part_string (&buffer, &buffer_len, + status = parse_part_string (&buffer, &buffer_size, vl.type_instance, sizeof (vl.type_instance)); if (status == 0) @@ -1047,7 +1380,7 @@ static int parse_packet (receive_list_entry_t *rle) /* {{{ */ } else if (pkg_type == TYPE_MESSAGE) { - status = parse_part_string (&buffer, &buffer_len, + status = parse_part_string (&buffer, &buffer_size, n.message, sizeof (n.message)); if (status != 0) @@ -1083,7 +1416,7 @@ static int parse_packet (receive_list_entry_t *rle) /* {{{ */ else if (pkg_type == TYPE_SEVERITY) { uint64_t tmp = 0; - status = parse_part_number (&buffer, &buffer_len, + status = parse_part_number (&buffer, &buffer_size, &tmp); if (status == 0) n.severity = (int) tmp; @@ -1094,33 +1427,75 @@ static int parse_packet (receive_list_entry_t *rle) /* {{{ */ " type: 0x%04hx", pkg_type); buffer = ((char *) buffer) + pkg_length; } - } /* while (buffer_len > sizeof (part_header_t)) */ + } /* while (buffer_size > sizeof (part_header_t)) */ + + if (status == 0 && buffer_size > 0) + WARNING ("network plugin: parse_packet: Received truncated " + "packet, try increasing `MaxPacketSize'"); return (status); } /* }}} int parse_packet */ -static void free_sockent (sockent_t *se) /* {{{ */ +static void free_sockent_client (struct sockent_client *sec) /* {{{ */ { - sockent_t *next; - while (se != NULL) - { - next = se->next; + if (sec->fd >= 0) + { + close (sec->fd); + sec->fd = -1; + } + sfree (sec->addr); +#if HAVE_LIBGCRYPT + sfree (sec->username); + sfree (sec->password); + if (sec->cypher != NULL) + gcry_cipher_close (sec->cypher); +#endif +} /* }}} void free_sockent_client */ -#if HAVE_GCRYPT_H - if (se->cypher != NULL) - { - gcry_cipher_close (se->cypher); - se->cypher = NULL; - } - free (se->shared_secret); -#endif /* HAVE_GCRYPT_H */ +static void free_sockent_server (struct sockent_server *ses) /* {{{ */ +{ + size_t i; + + for (i = 0; i < ses->fd_num; i++) + { + if (ses->fd[i] >= 0) + { + close (ses->fd[i]); + ses->fd[i] = -1; + } + } - free (se->addr); - free (se); + sfree (ses->fd); +#if HAVE_LIBGCRYPT + sfree (ses->auth_file); + fbh_destroy (ses->userdb); + if (ses->cypher != NULL) + gcry_cipher_close (ses->cypher); +#endif +} /* }}} void free_sockent_server */ - se = next; - } -} /* }}} void free_sockent */ +static void sockent_destroy (sockent_t *se) /* {{{ */ +{ + sockent_t *next; + + DEBUG ("network plugin: sockent_destroy (se = %p);", (void *) se); + + while (se != NULL) + { + next = se->next; + + sfree (se->node); + sfree (se->service); + + if (se->type == SOCKENT_TYPE_CLIENT) + free_sockent_client (&se->data.client); + else + free_sockent_server (&se->data.server); + + sfree (se); + se = next; + } +} /* }}} void sockent_destroy */ /* * int network_set_ttl @@ -1133,11 +1508,14 @@ static void free_sockent (sockent_t *se) /* {{{ */ */ static int network_set_ttl (const sockent_t *se, const struct addrinfo *ai) { + DEBUG ("network plugin: network_set_ttl: network_config_ttl = %i;", + network_config_ttl); + + assert (se->type == SOCKENT_TYPE_CLIENT); + if ((network_config_ttl < 1) || (network_config_ttl > 255)) return (-1); - DEBUG ("ttl = %i", network_config_ttl); - if (ai->ai_family == AF_INET) { struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr; @@ -1148,7 +1526,7 @@ static int network_set_ttl (const sockent_t *se, const struct addrinfo *ai) else optname = IP_TTL; - if (setsockopt (se->fd, IPPROTO_IP, optname, + if (setsockopt (se->data.client.fd, IPPROTO_IP, optname, &network_config_ttl, sizeof (network_config_ttl)) == -1) { @@ -1169,7 +1547,7 @@ static int network_set_ttl (const sockent_t *se, const struct addrinfo *ai) else optname = IPV6_UNICAST_HOPS; - if (setsockopt (se->fd, IPPROTO_IPV6, optname, + if (setsockopt (se->data.client.fd, IPPROTO_IPV6, optname, &network_config_ttl, sizeof (network_config_ttl)) == -1) { @@ -1184,60 +1562,13 @@ static int network_set_ttl (const sockent_t *se, const struct addrinfo *ai) return (0); } /* int network_set_ttl */ -#if HAVE_GCRYPT_H -static int network_set_encryption (sockent_t *se, /* {{{ */ - const char *shared_secret) -{ - char hash[32]; - gcry_error_t err; - - se->shared_secret = sstrdup (shared_secret); - - err = gcry_cipher_open (&se->cypher, - GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_ECB, /* flags = */ 0); - if (err != 0) - { - ERROR ("network plugin: gcry_cipher_open returned: %s", - gcry_strerror (err)); - return (-1); - } - - err = gcry_cipher_setiv (se->cypher, network_encryption_iv, - sizeof (network_encryption_iv)); - if (err != 0) - { - ERROR ("network plugin: gcry_cipher_setiv returned: %s", - gcry_strerror (err)); - gcry_cipher_close (se->cypher); - se->cypher = NULL; - return (-1); - } - - assert (se->shared_secret != NULL); - gcry_md_hash_buffer (GCRY_MD_SHA256, hash, - se->shared_secret, strlen (se->shared_secret)); - - err = gcry_cipher_setkey (se->cypher, hash, sizeof (hash)); - if (err != 0) - { - DEBUG ("network plugin: gcry_cipher_setkey returned: %s", - gcry_strerror (err)); - gcry_cipher_close (se->cypher); - se->cypher = NULL; - return (-1); - } - - return (0); -} /* }}} int network_set_encryption */ -#endif /* HAVE_GCRYPT_H */ - -static int network_bind_socket (const sockent_t *se, const struct addrinfo *ai) +static int network_bind_socket (int fd, const struct addrinfo *ai) { int loop = 0; int yes = 1; /* allow multiple sockets to use the same PORT number */ - if (setsockopt(se->fd, SOL_SOCKET, SO_REUSEADDR, + if (setsockopt (fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) == -1) { char errbuf[1024]; ERROR ("setsockopt: %s", @@ -1245,9 +1576,9 @@ static int network_bind_socket (const sockent_t *se, const struct addrinfo *ai) return (-1); } - DEBUG ("fd = %i; calling `bind'", se->fd); + DEBUG ("fd = %i; calling `bind'", fd); - if (bind (se->fd, ai->ai_addr, ai->ai_addrlen) == -1) + if (bind (fd, ai->ai_addr, ai->ai_addrlen) == -1) { char errbuf[1024]; ERROR ("bind: %s", @@ -1262,12 +1593,12 @@ static int network_bind_socket (const sockent_t *se, const struct addrinfo *ai) { struct ip_mreq mreq; - DEBUG ("fd = %i; IPv4 multicast address found", se->fd); + DEBUG ("fd = %i; IPv4 multicast address found", fd); mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr; mreq.imr_interface.s_addr = htonl (INADDR_ANY); - if (setsockopt (se->fd, IPPROTO_IP, IP_MULTICAST_LOOP, + if (setsockopt (fd, IPPROTO_IP, IP_MULTICAST_LOOP, &loop, sizeof (loop)) == -1) { char errbuf[1024]; @@ -1277,7 +1608,7 @@ static int network_bind_socket (const sockent_t *se, const struct addrinfo *ai) return (-1); } - if (setsockopt (se->fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, + if (setsockopt (fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof (mreq)) == -1) { char errbuf[1024]; @@ -1296,7 +1627,7 @@ static int network_bind_socket (const sockent_t *se, const struct addrinfo *ai) { struct ipv6_mreq mreq; - DEBUG ("fd = %i; IPv6 multicast address found", se->fd); + DEBUG ("fd = %i; IPv6 multicast address found", fd); memcpy (&mreq.ipv6mr_multiaddr, &addr->sin6_addr, @@ -1313,7 +1644,7 @@ static int network_bind_socket (const sockent_t *se, const struct addrinfo *ai) * group on more than one interface.*/ mreq.ipv6mr_interface = 0; - if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, + if (setsockopt (fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &loop, sizeof (loop)) == -1) { char errbuf[1024]; @@ -1323,7 +1654,7 @@ static int network_bind_socket (const sockent_t *se, const struct addrinfo *ai) return (-1); } - if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, + if (setsockopt (fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq, sizeof (mreq)) == -1) { char errbuf[1024]; @@ -1338,24 +1669,117 @@ static int network_bind_socket (const sockent_t *se, const struct addrinfo *ai) return (0); } /* int network_bind_socket */ -#define CREATE_SOCKET_FLAGS_LISTEN 0x0001 -static sockent_t *network_create_socket (const char *node, /* {{{ */ - const char *service, - const char *shared_secret, - int security_level, - int flags) +/* Initialize a sockent structure. `type' must be either `SOCKENT_TYPE_CLIENT' + * or `SOCKENT_TYPE_SERVER' */ +static int sockent_init (sockent_t *se, int type) /* {{{ */ +{ + if (se == NULL) + return (-1); + + memset (se, 0, sizeof (*se)); + + se->type = SOCKENT_TYPE_CLIENT; + se->node = NULL; + se->service = NULL; + se->next = NULL; + + if (type == SOCKENT_TYPE_SERVER) + { + se->type = SOCKENT_TYPE_SERVER; + se->data.server.fd = NULL; +#if HAVE_LIBGCRYPT + se->data.server.security_level = SECURITY_LEVEL_NONE; + se->data.server.auth_file = NULL; + se->data.server.userdb = NULL; + se->data.server.cypher = NULL; +#endif + } + else + { + se->data.client.fd = -1; + se->data.client.addr = NULL; +#if HAVE_LIBGCRYPT + se->data.client.security_level = SECURITY_LEVEL_NONE; + se->data.client.username = NULL; + se->data.client.password = NULL; + se->data.client.cypher = NULL; +#endif + } + + return (0); +} /* }}} int sockent_init */ + +/* Open the file descriptors for a initialized sockent structure. */ +static int sockent_open (sockent_t *se) /* {{{ */ { struct addrinfo ai_hints; struct addrinfo *ai_list, *ai_ptr; int ai_return; - sockent_t *se_head = NULL; - sockent_t *se_tail = NULL; + const char *node; + const char *service; - DEBUG ("node = %s, service = %s", node, service); + if (se == NULL) + return (-1); - memset (&ai_hints, '\0', sizeof (ai_hints)); - ai_hints.ai_flags = 0; + /* Set up the security structures. */ +#if HAVE_LIBGCRYPT /* {{{ */ + if (se->type == SOCKENT_TYPE_CLIENT) + { + if (se->data.client.security_level > SECURITY_LEVEL_NONE) + { + if ((se->data.client.username == NULL) + || (se->data.client.password == NULL)) + { + ERROR ("network plugin: Client socket with " + "security requested, but no " + "credentials are configured."); + return (-1); + } + gcry_md_hash_buffer (GCRY_MD_SHA256, + se->data.client.password_hash, + se->data.client.password, + strlen (se->data.client.password)); + } + } + else /* (se->type == SOCKENT_TYPE_SERVER) */ + { + if (se->data.server.security_level > SECURITY_LEVEL_NONE) + { + if (se->data.server.auth_file == NULL) + { + ERROR ("network plugin: Server socket with " + "security requested, but no " + "password file is configured."); + return (-1); + } + } + if (se->data.server.auth_file != NULL) + { + se->data.server.userdb = fbh_create (se->data.server.auth_file); + if (se->data.server.userdb == NULL) + { + ERROR ("network plugin: Reading password file " + "`%s' failed.", + se->data.server.auth_file); + if (se->data.server.security_level > SECURITY_LEVEL_NONE) + return (-1); + } + } + } +#endif /* }}} HAVE_LIBGCRYPT */ + + node = se->node; + service = se->service; + + if (service == NULL) + service = NET_DEFAULT_PORT; + + DEBUG ("network plugin: sockent_open: node = %s; service = %s;", + node, service); + + memset (&ai_hints, 0, sizeof (ai_hints)); + ai_hints.ai_flags = 0; #ifdef AI_PASSIVE ai_hints.ai_flags |= AI_PASSIVE; #endif @@ -1369,257 +1793,175 @@ static sockent_t *network_create_socket (const char *node, /* {{{ */ ai_return = getaddrinfo (node, service, &ai_hints, &ai_list); if (ai_return != 0) { - char errbuf[1024]; - ERROR ("getaddrinfo (%s, %s): %s", - (node == NULL) ? "(null)" : node, - (service == NULL) ? "(null)" : service, - (ai_return == EAI_SYSTEM) - ? sstrerror (errno, errbuf, sizeof (errbuf)) - : gai_strerror (ai_return)); - return (NULL); + ERROR ("network plugin: getaddrinfo (%s, %s) failed: %s", + (se->node == NULL) ? "(null)" : se->node, + (se->service == NULL) ? "(null)" : se->service, + gai_strerror (ai_return)); + return (-1); } for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next) { - sockent_t *se; int status; - if ((se = (sockent_t *) malloc (sizeof (sockent_t))) == NULL) - { - char errbuf[1024]; - ERROR ("malloc: %s", - sstrerror (errno, errbuf, - sizeof (errbuf))); - continue; - } - - if ((se->addr = (struct sockaddr_storage *) malloc (sizeof (struct sockaddr_storage))) == NULL) + if (se->type == SOCKENT_TYPE_SERVER) /* {{{ */ { - char errbuf[1024]; - ERROR ("malloc: %s", - sstrerror (errno, errbuf, - sizeof (errbuf))); - free (se); - continue; - } - - assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen); - memset (se->addr, '\0', sizeof (struct sockaddr_storage)); - memcpy (se->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen); - se->addrlen = ai_ptr->ai_addrlen; + int *tmp; - se->fd = socket (ai_ptr->ai_family, - ai_ptr->ai_socktype, - ai_ptr->ai_protocol); - se->next = NULL; + tmp = realloc (se->data.server.fd, + sizeof (*tmp) * (se->data.server.fd_num + 1)); + if (tmp == NULL) + { + ERROR ("network plugin: realloc failed."); + continue; + } + se->data.server.fd = tmp; + tmp = se->data.server.fd + se->data.server.fd_num; - if (se->fd == -1) - { - char errbuf[1024]; - ERROR ("socket: %s", - sstrerror (errno, errbuf, - sizeof (errbuf))); - free (se->addr); - free (se); - continue; - } + *tmp = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, + ai_ptr->ai_protocol); + if (*tmp < 0) + { + char errbuf[1024]; + ERROR ("network plugin: socket(2) failed: %s", + sstrerror (errno, errbuf, + sizeof (errbuf))); + continue; + } - if ((flags & CREATE_SOCKET_FLAGS_LISTEN) != 0) - { - status = network_bind_socket (se, ai_ptr); + status = network_bind_socket (*tmp, ai_ptr); if (status != 0) { - close (se->fd); - free (se->addr); - free (se); + close (*tmp); + *tmp = -1; continue; } - } - else /* sending socket */ - { - network_set_ttl (se, ai_ptr); - } -#if HAVE_GCRYPT_H - se->security_level = security_level; - se->shared_secret = NULL; - se->cypher = NULL; - if (shared_secret != NULL) + se->data.server.fd_num++; + continue; + } /* }}} if (se->type == SOCKENT_TYPE_SERVER) */ + else /* if (se->type == SOCKENT_TYPE_CLIENT) {{{ */ { - status = network_set_encryption (se, shared_secret); - if ((status != 0) && (security_level <= SECURITY_LEVEL_SIGN)) + se->data.client.fd = socket (ai_ptr->ai_family, + ai_ptr->ai_socktype, + ai_ptr->ai_protocol); + if (se->data.client.fd < 0) { - WARNING ("network plugin: Starting cryptograp" - "hic subsystem failed. Since " - "security level `Sign' or " - "`None' is configured I will " - "continue."); + char errbuf[1024]; + ERROR ("network plugin: socket(2) failed: %s", + sstrerror (errno, errbuf, + sizeof (errbuf))); + continue; } - else if (status != 0) + + se->data.client.addr = malloc (sizeof (*se->data.client.addr)); + if (se->data.client.addr == NULL) { - ERROR ("network plugin: Starting cryptograp" - "hic subsystem failed. " - "Because the security level " - "is set to `Encrypt' I will " - "not continue!"); - close (se->fd); - free (se->addr); - free (se); + ERROR ("network plugin: malloc failed."); + close (se->data.client.fd); + se->data.client.fd = -1; continue; } - } /* if (shared_secret != NULL) */ -#else - /* Make compiler happy */ - security_level = 0; - shared_secret = NULL; -#endif /* HAVE_GCRYPT_H */ - - if (se_tail == NULL) - { - se_head = se; - se_tail = se; - } - else - { - se_tail->next = se; - se_tail = se; - } - - /* We don't open more than one write-socket per node/service pair.. */ - if ((flags & CREATE_SOCKET_FLAGS_LISTEN) == 0) - break; - } - - freeaddrinfo (ai_list); - return (se_head); -} /* }}} sockent_t *network_create_socket */ + memset (se->data.client.addr, 0, sizeof (*se->data.client.addr)); + assert (sizeof (*se->data.client.addr) >= ai_ptr->ai_addrlen); + memcpy (se->data.client.addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen); + se->data.client.addrlen = ai_ptr->ai_addrlen; -static sockent_t *network_create_default_socket (int flags) /* {{{ */ -{ - sockent_t *se_ptr = NULL; - sockent_t *se_head = NULL; - sockent_t *se_tail = NULL; + network_set_ttl (se, ai_ptr); - se_ptr = network_create_socket (NET_DEFAULT_V6_ADDR, NET_DEFAULT_PORT, - /* shared secret = */ NULL, SECURITY_LEVEL_NONE, - flags); + /* We don't open more than one write-socket per + * node/service pair.. */ + break; + } /* }}} if (se->type == SOCKENT_TYPE_CLIENT) */ + } /* for (ai_list) */ - /* Don't send to the same machine in IPv6 and IPv4 if both are available. */ - if (((flags & CREATE_SOCKET_FLAGS_LISTEN) == 0) && (se_ptr != NULL)) - return (se_ptr); + freeaddrinfo (ai_list); - if (se_ptr != NULL) + /* Check if all went well. */ + if (se->type == SOCKENT_TYPE_SERVER) { - se_head = se_ptr; - se_tail = se_ptr; - while (se_tail->next != NULL) - se_tail = se_tail->next; + if (se->data.server.fd_num <= 0) + return (-1); + } + else /* if (se->type == SOCKENT_TYPE_CLIENT) */ + { + if (se->data.client.fd < 0) + return (-1); } - se_ptr = network_create_socket (NET_DEFAULT_V4_ADDR, NET_DEFAULT_PORT, - /* shared secret = */ NULL, SECURITY_LEVEL_NONE, - flags); - - if (se_tail == NULL) - return (se_ptr); - - se_tail->next = se_ptr; - return (se_head); -} /* }}} sockent_t *network_create_default_socket */ + return (0); +} /* }}} int sockent_open */ -static int network_add_listen_socket (const char *node, /* {{{ */ - const char *service, const char *shared_secret, int security_level) +/* Add a sockent to the global list of sockets */ +static int sockent_add (sockent_t *se) /* {{{ */ { - sockent_t *se; - sockent_t *se_ptr; - int se_num = 0; - - int flags; - - flags = CREATE_SOCKET_FLAGS_LISTEN; - - if (service == NULL) - service = NET_DEFAULT_PORT; - - if (node == NULL) - se = network_create_default_socket (flags); - else - se = network_create_socket (node, service, - shared_secret, security_level, flags); + sockent_t *last_ptr; if (se == NULL) return (-1); - for (se_ptr = se; se_ptr != NULL; se_ptr = se_ptr->next) - se_num++; - - listen_sockets_pollfd = realloc (listen_sockets_pollfd, - (listen_sockets_num + se_num) - * sizeof (struct pollfd)); - - for (se_ptr = se; se_ptr != NULL; se_ptr = se_ptr->next) + if (se->type == SOCKENT_TYPE_SERVER) { - listen_sockets_pollfd[listen_sockets_num].fd = se_ptr->fd; - listen_sockets_pollfd[listen_sockets_num].events = POLLIN | POLLPRI; - listen_sockets_pollfd[listen_sockets_num].revents = 0; - listen_sockets_num++; - } /* for (se) */ - - se_ptr = listen_sockets; - while ((se_ptr != NULL) && (se_ptr->next != NULL)) - se_ptr = se_ptr->next; - - if (se_ptr == NULL) - listen_sockets = se; - else - se_ptr->next = se; - - return (0); -} /* }}} int network_add_listen_socket */ + struct pollfd *tmp; + size_t i; -static int network_add_sending_socket (const char *node, /* {{{ */ - const char *service, const char *shared_secret, int security_level) -{ - sockent_t *se; - sockent_t *se_ptr; - - if (service == NULL) - service = NET_DEFAULT_PORT; + tmp = realloc (listen_sockets_pollfd, + sizeof (*tmp) * (listen_sockets_num + + se->data.server.fd_num)); + if (tmp == NULL) + { + ERROR ("network plugin: realloc failed."); + return (-1); + } + listen_sockets_pollfd = tmp; + tmp = listen_sockets_pollfd + listen_sockets_num; - if (node == NULL) - se = network_create_default_socket (/* flags = */ 0); - else - se = network_create_socket (node, service, - shared_secret, security_level, - /* flags = */ 0); + for (i = 0; i < se->data.server.fd_num; i++) + { + memset (tmp + i, 0, sizeof (*tmp)); + tmp[i].fd = se->data.server.fd[i]; + tmp[i].events = POLLIN | POLLPRI; + tmp[i].revents = 0; + } - if (se == NULL) - return (-1); + listen_sockets_num += se->data.server.fd_num; - if (sending_sockets == NULL) + if (listen_sockets == NULL) + { + listen_sockets = se; + return (0); + } + last_ptr = listen_sockets; + } + else /* if (se->type == SOCKENT_TYPE_CLIENT) */ { - sending_sockets = se; - return (0); + if (sending_sockets == NULL) + { + sending_sockets = se; + return (0); + } + last_ptr = sending_sockets; } - for (se_ptr = sending_sockets; se_ptr->next != NULL; se_ptr = se_ptr->next) - /* seek end */; + while (last_ptr->next != NULL) + last_ptr = last_ptr->next; + last_ptr->next = se; - se_ptr->next = se; return (0); -} /* }}} int network_add_sending_socket */ +} /* }}} int sockent_add */ -static void *dispatch_thread (void __attribute__((unused)) *arg) +static void *dispatch_thread (void __attribute__((unused)) *arg) /* {{{ */ { while (42) { receive_list_entry_t *ent; + sockent_t *se; /* Lock and wait for more data to come in */ pthread_mutex_lock (&receive_list_lock); while ((listen_loop == 0) - && (receive_list_head == NULL)) + && (receive_list_head == NULL)) pthread_cond_wait (&receive_list_cond, &receive_list_lock); /* Remove the head entry and unlock */ @@ -1633,17 +1975,43 @@ static void *dispatch_thread (void __attribute__((unused)) *arg) if (ent == NULL) break; - parse_packet (ent); + /* Look for the correct `sockent_t' */ + se = listen_sockets; + while (se != NULL) + { + size_t i; + + for (i = 0; i < se->data.server.fd_num; i++) + if (se->data.server.fd[i] == ent->fd) + break; + + if (i < se->data.server.fd_num) + break; + + se = se->next; + } + + if (se == NULL) + { + ERROR ("network plugin: Got packet from FD %i, but can't " + "find an appropriate socket entry.", + ent->fd); + sfree (ent->data); + sfree (ent); + continue; + } + parse_packet (se, ent->data, ent->data_len, /* flags = */ 0); + sfree (ent->data); sfree (ent); } /* while (42) */ return (NULL); -} /* void *dispatch_thread */ +} /* }}} void *dispatch_thread */ -static int network_receive (void) +static int network_receive (void) /* {{{ */ { - char buffer[BUFF_SIZE]; + char buffer[network_config_packet_size]; int buffer_len; int i; @@ -1652,17 +2020,7 @@ static int network_receive (void) receive_list_entry_t *private_list_head; receive_list_entry_t *private_list_tail; - if (listen_sockets_num == 0) - network_add_listen_socket (/* node = */ NULL, - /* service = */ NULL, - /* shared secret = */ NULL, - /* encryption = */ 0); - - if (listen_sockets_num == 0) - { - ERROR ("network: Failed to open a listening socket."); - return (-1); - } + assert (listen_sockets_num > 0); private_list_head = NULL; private_list_tail = NULL; @@ -1713,14 +2071,15 @@ static int network_receive (void) return (-1); } memset (ent, 0, sizeof (receive_list_entry_t)); + ent->data = malloc (network_config_packet_size); + if (ent->data == NULL) + { + ERROR ("network plugin: malloc failed."); + return (-1); + } ent->fd = listen_sockets_pollfd[i].fd; ent->next = NULL; - /* Hopefully this be optimized out by the compiler. It - * might help prevent stupid bugs in the future though. - */ - assert (sizeof (ent->data) == sizeof (buffer)); - memcpy (ent->data, buffer, buffer_len); ent->data_len = buffer_len; @@ -1768,7 +2127,7 @@ static int network_receive (void) } return (0); -} /* int network_receive */ +} /* }}} int network_receive */ static void *receive_thread (void __attribute__((unused)) *arg) { @@ -1777,7 +2136,7 @@ static void *receive_thread (void __attribute__((unused)) *arg) static void network_init_buffer (void) { - memset (send_buffer, 0, sizeof (send_buffer)); + memset (send_buffer, 0, network_config_packet_size); send_buffer_ptr = send_buffer; send_buffer_fill = 0; @@ -1791,9 +2150,11 @@ static void networt_send_buffer_plain (const sockent_t *se, /* {{{ */ while (42) { - status = sendto (se->fd, buffer, buffer_size, 0 /* no flags */, - (struct sockaddr *) se->addr, se->addrlen); - if (status < 0) + status = sendto (se->data.client.fd, buffer, buffer_size, + /* flags = */ 0, + (struct sockaddr *) se->data.client.addr, + se->data.client.addrlen); + if (status < 0) { char errbuf[1024]; if (errno == EINTR) @@ -1808,72 +2169,157 @@ static void networt_send_buffer_plain (const sockent_t *se, /* {{{ */ } /* while (42) */ } /* }}} void networt_send_buffer_plain */ -#if HAVE_GCRYPT_H +#if HAVE_LIBGCRYPT +#define BUFFER_ADD(p,s) do { \ + memcpy (buffer + buffer_offset, (p), (s)); \ + buffer_offset += (s); \ +} while (0) + static void networt_send_buffer_signed (const sockent_t *se, /* {{{ */ const char *in_buffer, size_t in_buffer_size) { - part_signature_sha256_t ps; - char buffer[sizeof (ps) + in_buffer_size]; - char hash[sizeof (ps.hash)]; + part_signature_sha256_t ps; + char buffer[BUFF_SIG_SIZE + in_buffer_size]; + size_t buffer_offset; + size_t username_len; + + gcry_md_hd_t hd; + gcry_error_t err; + unsigned char *hash; + + hd = NULL; + err = gcry_md_open (&hd, GCRY_MD_SHA256, GCRY_MD_FLAG_HMAC); + if (err != 0) + { + ERROR ("network plugin: Creating HMAC object failed: %s", + gcry_strerror (err)); + return; + } + + err = gcry_md_setkey (hd, se->data.client.password, + strlen (se->data.client.password)); + if (err != 0) + { + ERROR ("network plugin: gcry_md_setkey failed: %s", + gcry_strerror (err)); + gcry_md_close (hd); + return; + } + + username_len = strlen (se->data.client.username); + if (username_len > (BUFF_SIG_SIZE - PART_SIGNATURE_SHA256_SIZE)) + { + ERROR ("network plugin: Username too long: %s", + se->data.client.username); + return; + } + + memcpy (buffer + PART_SIGNATURE_SHA256_SIZE, + se->data.client.username, username_len); + memcpy (buffer + PART_SIGNATURE_SHA256_SIZE + username_len, + in_buffer, in_buffer_size); + + /* Initialize the `ps' structure. */ + memset (&ps, 0, sizeof (ps)); + ps.head.type = htons (TYPE_SIGN_SHA256); + ps.head.length = htons (PART_SIGNATURE_SHA256_SIZE + username_len); + + /* Calculate the hash value. */ + gcry_md_write (hd, buffer + PART_SIGNATURE_SHA256_SIZE, + username_len + in_buffer_size); + hash = gcry_md_read (hd, GCRY_MD_SHA256); + if (hash == NULL) + { + ERROR ("network plugin: gcry_md_read failed."); + gcry_md_close (hd); + return; + } + memcpy (ps.hash, hash, sizeof (ps.hash)); - /* Initialize the `ps' structure. */ - memset (&ps, 0, sizeof (ps)); - ps.head.type = htons (TYPE_SIGN_SHA256); - ps.head.length = htons ((uint16_t) sizeof (ps)); - sstrncpy (ps.hash, se->shared_secret, sizeof (ps.hash)); + /* Add the header */ + buffer_offset = 0; - /* Prepend the signature. */ - memcpy (buffer, &ps, sizeof (ps)); - memcpy (buffer + sizeof (ps), in_buffer, in_buffer_size); + BUFFER_ADD (&ps.head.type, sizeof (ps.head.type)); + BUFFER_ADD (&ps.head.length, sizeof (ps.head.length)); + BUFFER_ADD (ps.hash, sizeof (ps.hash)); - /* Calculate the hash value. */ - gcry_md_hash_buffer (GCRY_MD_SHA256, hash, buffer, sizeof (buffer)); + assert (buffer_offset == PART_SIGNATURE_SHA256_SIZE); - /* Copy the hash value into the buffer. */ - memcpy (ps.hash, hash, sizeof (ps.hash)); - memcpy (buffer, &ps, sizeof (ps)); + gcry_md_close (hd); + hd = NULL; - networt_send_buffer_plain (se, buffer, sizeof (buffer)); + buffer_offset = PART_SIGNATURE_SHA256_SIZE + username_len + in_buffer_size; + networt_send_buffer_plain (se, buffer, buffer_offset); } /* }}} void networt_send_buffer_signed */ -static void networt_send_buffer_encrypted (const sockent_t *se, /* {{{ */ +static void networt_send_buffer_encrypted (sockent_t *se, /* {{{ */ const char *in_buffer, size_t in_buffer_size) { part_encryption_aes256_t pea; - char buffer[sizeof (pea) + in_buffer_size + 16]; + char buffer[BUFF_SIG_SIZE + in_buffer_size]; size_t buffer_size; + size_t buffer_offset; + size_t header_size; + size_t username_len; gcry_error_t err; + gcry_cipher_hd_t cypher; + + /* Initialize the header fields */ + memset (&pea, 0, sizeof (pea)); + pea.head.type = htons (TYPE_ENCR_AES256); + + pea.username = se->data.client.username; + + username_len = strlen (pea.username); + if ((PART_ENCRYPTION_AES256_SIZE + username_len) > BUFF_SIG_SIZE) + { + ERROR ("network plugin: Username too long: %s", pea.username); + return; + } - /* Round to the next multiple of 16, because AES has a block size of 128 bit. - * the first four bytes of `pea' are not encrypted and must be subtracted. */ - buffer_size = (sizeof (pea) + in_buffer_size + 15 - sizeof (pea.head)) / 16; - buffer_size = buffer_size * 16; - buffer_size += sizeof (pea.head); + buffer_size = PART_ENCRYPTION_AES256_SIZE + username_len + in_buffer_size; + header_size = PART_ENCRYPTION_AES256_SIZE + username_len + - sizeof (pea.hash); + assert (buffer_size <= sizeof (buffer)); DEBUG ("network plugin: networt_send_buffer_encrypted: " "buffer_size = %zu;", buffer_size); - /* Initialize the header fields */ - memset (&pea, 0, sizeof (pea)); - pea.head.type = htons (TYPE_ENCR_AES256); - pea.head.length = htons ((uint16_t) buffer_size); - pea.orig_length = htons ((uint16_t) in_buffer_size); + pea.head.length = htons ((uint16_t) (PART_ENCRYPTION_AES256_SIZE + + username_len + in_buffer_size)); + pea.username_length = htons ((uint16_t) username_len); - /* Fill the extra field with random values. Some entropy in the encrypted - * data is usually not a bad thing, I hope. */ - gcry_randomize (&pea.random, sizeof (pea.random), GCRY_STRONG_RANDOM); + /* Chose a random initialization vector. */ + gcry_randomize ((void *) &pea.iv, sizeof (pea.iv), GCRY_STRONG_RANDOM); /* Create hash of the payload */ - gcry_md_hash_buffer (GCRY_MD_SHA224, pea.hash, in_buffer, in_buffer_size); + gcry_md_hash_buffer (GCRY_MD_SHA1, pea.hash, in_buffer, in_buffer_size); /* Initialize the buffer */ + buffer_offset = 0; memset (buffer, 0, sizeof (buffer)); - memcpy (buffer, &pea, sizeof (pea)); - memcpy (buffer + sizeof (pea), in_buffer, in_buffer_size); + + + BUFFER_ADD (&pea.head.type, sizeof (pea.head.type)); + BUFFER_ADD (&pea.head.length, sizeof (pea.head.length)); + BUFFER_ADD (&pea.username_length, sizeof (pea.username_length)); + BUFFER_ADD (pea.username, username_len); + BUFFER_ADD (pea.iv, sizeof (pea.iv)); + assert (buffer_offset == header_size); + BUFFER_ADD (pea.hash, sizeof (pea.hash)); + BUFFER_ADD (in_buffer, in_buffer_size); + + assert (buffer_offset == buffer_size); + + cypher = network_get_aes256_cypher (se, pea.iv, sizeof (pea.iv), + se->data.client.password); + if (cypher == NULL) + return; /* Encrypt the buffer in-place */ - err = gcry_cipher_encrypt (se->cypher, - buffer + sizeof (pea.head), buffer_size - sizeof (pea.head), + err = gcry_cipher_encrypt (cypher, + buffer + header_size, + buffer_size - header_size, /* in = */ NULL, /* in len = */ 0); if (err != 0) { @@ -1885,7 +2331,8 @@ static void networt_send_buffer_encrypted (const sockent_t *se, /* {{{ */ /* Send it out without further modifications */ networt_send_buffer_plain (se, buffer, buffer_size); } /* }}} void networt_send_buffer_encrypted */ -#endif /* HAVE_GCRYPT_H */ +#undef BUFFER_ADD +#endif /* HAVE_LIBGCRYPT */ static void network_send_buffer (char *buffer, size_t buffer_len) /* {{{ */ { @@ -1895,13 +2342,13 @@ static void network_send_buffer (char *buffer, size_t buffer_len) /* {{{ */ for (se = sending_sockets; se != NULL; se = se->next) { -#if HAVE_GCRYPT_H - if (se->security_level == SECURITY_LEVEL_ENCRYPT) +#if HAVE_LIBGCRYPT + if (se->data.client.security_level == SECURITY_LEVEL_ENCRYPT) networt_send_buffer_encrypted (se, buffer, buffer_len); - else if (se->security_level == SECURITY_LEVEL_SIGN) + else if (se->data.client.security_level == SECURITY_LEVEL_SIGN) networt_send_buffer_signed (se, buffer, buffer_len); - else /* if (se->security_level == SECURITY_LEVEL_NONE) */ -#endif /* HAVE_GCRYPT_H */ + else /* if (se->data.client.security_level == SECURITY_LEVEL_NONE) */ +#endif /* HAVE_LIBGCRYPT */ networt_send_buffer_plain (se, buffer, buffer_len); } /* for (sending_sockets) */ } /* }}} void network_send_buffer */ @@ -1990,18 +2437,25 @@ static int network_write (const data_set_t *ds, const value_list_t *vl, { int status; - /* If the value is already in the cache, we have received it via the - * network. We write it again if forwarding is activated. It's then in - * the cache and should we receive it again we will ignore it. */ - status = cache_check (vl); - if ((network_config_forward == 0) - && (status != 0)) - return (0); + if (!check_send_okay (vl)) + { +#if COLLECT_DEBUG + char name[6*DATA_MAX_NAME_LEN]; + FORMAT_VL (name, sizeof (name), vl); + name[sizeof (name) - 1] = 0; + DEBUG ("network plugin: network_write: " + "NOT sending %s.", name); +#endif + return (0); + } + + uc_meta_data_add_unsigned_int (vl, + "network:time_sent", (uint64_t) vl->time); pthread_mutex_lock (&send_buffer_lock); status = add_to_buffer (send_buffer_ptr, - sizeof (send_buffer) - (send_buffer_fill + BUFF_SIG_SIZE), + network_config_packet_size - (send_buffer_fill + BUFF_SIG_SIZE), &send_buffer_vl, ds, vl); if (status >= 0) @@ -2015,7 +2469,7 @@ static int network_write (const data_set_t *ds, const value_list_t *vl, flush_buffer (); status = add_to_buffer (send_buffer_ptr, - sizeof (send_buffer) - (send_buffer_fill + BUFF_SIG_SIZE), + network_config_packet_size - (send_buffer_fill + BUFF_SIG_SIZE), &send_buffer_vl, ds, vl); @@ -2031,7 +2485,7 @@ static int network_write (const data_set_t *ds, const value_list_t *vl, ERROR ("network plugin: Unable to append to the " "buffer for some weird reason"); } - else if ((sizeof (send_buffer) - send_buffer_fill) < 15) + else if ((network_config_packet_size - send_buffer_fill) < 15) { flush_buffer (); } @@ -2064,13 +2518,9 @@ static int network_config_set_boolean (const oconfig_item_t *ci, /* {{{ */ { char *str = ci->values[0].value.string; - if ((strcasecmp ("true", str) == 0) - || (strcasecmp ("yes", str) == 0) - || (strcasecmp ("on", str) == 0)) + if (IS_TRUE (str)) *retval = 1; - else if ((strcasecmp ("false", str) == 0) - || (strcasecmp ("no", str) == 0) - || (strcasecmp ("off", str) == 0)) + else if (IS_FALSE (str)) *retval = 0; else { @@ -2102,7 +2552,49 @@ static int network_config_set_ttl (const oconfig_item_t *ci) /* {{{ */ return (0); } /* }}} int network_config_set_ttl */ -#if HAVE_GCRYPT_H +static int network_config_set_buffer_size (const oconfig_item_t *ci) /* {{{ */ +{ + int tmp; + if ((ci->values_num != 1) + || (ci->values[0].type != OCONFIG_TYPE_NUMBER)) + { + WARNING ("network plugin: The `MaxPacketSize' config option needs exactly " + "one numeric argument."); + return (-1); + } + + tmp = (int) ci->values[0].value.number; + if ((tmp >= 1024) && (tmp <= 65535)) + network_config_packet_size = tmp; + + return (0); +} /* }}} int network_config_set_buffer_size */ + +#if HAVE_LIBGCRYPT +static int network_config_set_string (const oconfig_item_t *ci, /* {{{ */ + char **ret_string) +{ + char *tmp; + if ((ci->values_num != 1) + || (ci->values[0].type != OCONFIG_TYPE_STRING)) + { + WARNING ("network plugin: The `%s' config option needs exactly " + "one string argument.", ci->key); + return (-1); + } + + tmp = strdup (ci->values[0].value.string); + if (tmp == NULL) + return (-1); + + sfree (*ret_string); + *ret_string = tmp; + + return (0); +} /* }}} int network_config_set_string */ +#endif /* HAVE_LIBGCRYPT */ + +#if HAVE_LIBGCRYPT static int network_config_set_security_level (oconfig_item_t *ci, /* {{{ */ int *retval) { @@ -2130,14 +2622,12 @@ static int network_config_set_security_level (oconfig_item_t *ci, /* {{{ */ return (0); } /* }}} int network_config_set_security_level */ -#endif /* HAVE_GCRYPT_H */ +#endif /* HAVE_LIBGCRYPT */ -static int network_config_listen_server (const oconfig_item_t *ci) /* {{{ */ +static int network_config_add_listen (const oconfig_item_t *ci) /* {{{ */ { - char *node; - char *service; - char *shared_secret = NULL; - int security_level = SECURITY_LEVEL_NONE; + sockent_t *se; + int status; int i; if ((ci->values_num < 1) || (ci->values_num > 2) @@ -2149,69 +2639,145 @@ static int network_config_listen_server (const oconfig_item_t *ci) /* {{{ */ return (-1); } - node = ci->values[0].value.string; + se = malloc (sizeof (*se)); + if (se == NULL) + { + ERROR ("network plugin: malloc failed."); + return (-1); + } + sockent_init (se, SOCKENT_TYPE_SERVER); + + se->node = strdup (ci->values[0].value.string); if (ci->values_num >= 2) - service = ci->values[1].value.string; - else - service = NULL; + se->service = strdup (ci->values[1].value.string); for (i = 0; i < ci->children_num; i++) { oconfig_item_t *child = ci->children + i; -#if HAVE_GCRYPT_H - if (strcasecmp ("Secret", child->key) == 0) - { - if ((child->values_num == 1) - && (child->values[0].type == OCONFIG_TYPE_STRING)) - shared_secret = child->values[0].value.string; - else - ERROR ("network plugin: The `Secret' option needs exactly one string " - "argument."); - } +#if HAVE_LIBGCRYPT + if (strcasecmp ("AuthFile", child->key) == 0) + network_config_set_string (child, &se->data.server.auth_file); else if (strcasecmp ("SecurityLevel", child->key) == 0) - network_config_set_security_level (child, &security_level); + network_config_set_security_level (child, + &se->data.server.security_level); else -#endif /* HAVE_GCRYPT_H */ +#endif /* HAVE_LIBGCRYPT */ { WARNING ("network plugin: Option `%s' is not allowed here.", child->key); } } - if ((security_level > SECURITY_LEVEL_NONE) && (shared_secret == NULL)) +#if HAVE_LIBGCRYPT + if ((se->data.server.security_level > SECURITY_LEVEL_NONE) + && (se->data.server.auth_file == NULL)) { ERROR ("network plugin: A security level higher than `none' was " - "requested, but no shared key was given. Cowardly refusing to open " - "this socket!"); + "requested, but no AuthFile option was given. Cowardly refusing to " + "open this socket!"); + sockent_destroy (se); return (-1); } +#endif /* HAVE_LIBGCRYPT */ - if (strcasecmp ("Listen", ci->key) == 0) - network_add_listen_socket (node, service, shared_secret, security_level); - else - network_add_sending_socket (node, service, shared_secret, security_level); + status = sockent_open (se); + if (status != 0) + { + ERROR ("network plugin: network_config_add_listen: sockent_open failed."); + sockent_destroy (se); + return (-1); + } + + status = sockent_add (se); + if (status != 0) + { + ERROR ("network plugin: network_config_add_listen: sockent_add failed."); + sockent_destroy (se); + return (-1); + } return (0); -} /* }}} int network_config_listen_server */ +} /* }}} int network_config_add_listen */ -static int network_config_set_cache_flush (const oconfig_item_t *ci) /* {{{ */ +static int network_config_add_server (const oconfig_item_t *ci) /* {{{ */ { - int tmp; - if ((ci->values_num != 1) - || (ci->values[0].type != OCONFIG_TYPE_NUMBER)) + sockent_t *se; + int status; + int i; + + if ((ci->values_num < 1) || (ci->values_num > 2) + || (ci->values[0].type != OCONFIG_TYPE_STRING) + || ((ci->values_num > 1) && (ci->values[1].type != OCONFIG_TYPE_STRING))) { - WARNING ("network plugin: The `CacheFlush' config option needs exactly " - "one numeric argument."); + ERROR ("network plugin: The `%s' config option needs " + "one or two string arguments.", ci->key); return (-1); } - tmp = (int) ci->values[0].value.number; - if (tmp > 0) - network_config_ttl = tmp; + se = malloc (sizeof (*se)); + if (se == NULL) + { + ERROR ("network plugin: malloc failed."); + return (-1); + } + sockent_init (se, SOCKENT_TYPE_CLIENT); + + se->node = strdup (ci->values[0].value.string); + if (ci->values_num >= 2) + se->service = strdup (ci->values[1].value.string); + + for (i = 0; i < ci->children_num; i++) + { + oconfig_item_t *child = ci->children + i; + +#if HAVE_LIBGCRYPT + if (strcasecmp ("Username", child->key) == 0) + network_config_set_string (child, &se->data.client.username); + else if (strcasecmp ("Password", child->key) == 0) + network_config_set_string (child, &se->data.client.password); + else if (strcasecmp ("SecurityLevel", child->key) == 0) + network_config_set_security_level (child, + &se->data.client.security_level); + else +#endif /* HAVE_LIBGCRYPT */ + { + WARNING ("network plugin: Option `%s' is not allowed here.", + child->key); + } + } + +#if HAVE_LIBGCRYPT + if ((se->data.client.security_level > SECURITY_LEVEL_NONE) + && ((se->data.client.username == NULL) + || (se->data.client.password == NULL))) + { + ERROR ("network plugin: A security level higher than `none' was " + "requested, but no Username or Password option was given. " + "Cowardly refusing to open this socket!"); + sockent_destroy (se); + return (-1); + } +#endif /* HAVE_LIBGCRYPT */ + + status = sockent_open (se); + if (status != 0) + { + ERROR ("network plugin: network_config_add_server: sockent_open failed."); + sockent_destroy (se); + return (-1); + } + + status = sockent_add (se); + if (status != 0) + { + ERROR ("network plugin: network_config_add_server: sockent_add failed."); + sockent_destroy (se); + return (-1); + } return (0); -} /* }}} int network_config_set_cache_flush */ +} /* }}} int network_config_add_server */ static int network_config (oconfig_item_t *ci) /* {{{ */ { @@ -2221,15 +2787,18 @@ static int network_config (oconfig_item_t *ci) /* {{{ */ { oconfig_item_t *child = ci->children + i; - if ((strcasecmp ("Listen", child->key) == 0) - || (strcasecmp ("Server", child->key) == 0)) - network_config_listen_server (child); + if (strcasecmp ("Listen", child->key) == 0) + network_config_add_listen (child); + else if (strcasecmp ("Server", child->key) == 0) + network_config_add_server (child); else if (strcasecmp ("TimeToLive", child->key) == 0) network_config_set_ttl (child); + else if (strcasecmp ("MaxPacketSize", child->key) == 0) + network_config_set_buffer_size (child); else if (strcasecmp ("Forward", child->key) == 0) network_config_set_boolean (child, &network_config_forward); else if (strcasecmp ("CacheFlush", child->key) == 0) - network_config_set_cache_flush (child); + /* no op for backwards compatibility only */; else { WARNING ("network plugin: Option `%s' is not allowed here.", @@ -2243,7 +2812,7 @@ static int network_config (oconfig_item_t *ci) /* {{{ */ static int network_notification (const notification_t *n, user_data_t __attribute__((unused)) *user_data) { - char buffer[BUFF_SIZE]; + char buffer[network_config_packet_size]; char *buffer_ptr = buffer; int buffer_free = sizeof (buffer); int status; @@ -2337,24 +2906,12 @@ static int network_shutdown (void) dispatch_thread_running = 0; } - free_sockent (listen_sockets); + sockent_destroy (listen_sockets); if (send_buffer_fill > 0) flush_buffer (); - if (cache_tree != NULL) - { - void *key; - void *value; - - while (c_avl_pick (cache_tree, &key, &value) == 0) - { - sfree (key); - sfree (value); - } - c_avl_destroy (cache_tree); - cache_tree = NULL; - } + sfree (send_buffer); /* TODO: Close `sending_sockets' */ @@ -2363,26 +2920,35 @@ static int network_shutdown (void) plugin_unregister_write ("network"); plugin_unregister_shutdown ("network"); - /* Let the init function do it's move again ;) */ - cache_flush_last = 0; - return (0); } /* int network_shutdown */ static int network_init (void) { + static _Bool have_init = false; + /* Check if we were already initialized. If so, just return - there's * nothing more to do (for now, that is). */ - if (cache_flush_last != 0) + if (have_init) return (0); + have_init = true; + +#if HAVE_LIBGCRYPT + gcry_control (GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread); + gcry_control (GCRYCTL_INIT_SECMEM, 32768, 0); + gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0); +#endif plugin_register_shutdown ("network", network_shutdown); + send_buffer = malloc (network_config_packet_size); + if (send_buffer == NULL) + { + ERROR ("network plugin: malloc failed."); + return (-1); + } network_init_buffer (); - cache_tree = c_avl_create ((int (*) (const void *, const void *)) strcmp); - cache_flush_last = time (NULL); - /* setup socket(s) and so on */ if (sending_sockets != NULL) { @@ -2454,11 +3020,8 @@ static int network_flush (int timeout, { pthread_mutex_lock (&send_buffer_lock); - if (((time (NULL) - cache_flush_last) >= timeout) - && (send_buffer_fill > 0)) - { - flush_buffer (); - } + if (send_buffer_fill > 0) + flush_buffer (); pthread_mutex_unlock (&send_buffer_lock);