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apache2.9445
apache2-CVE-2018-1312.patch
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File apache2-CVE-2018-1312.patch of Package apache2.9445
Index: httpd-2.4.23/modules/aaa/mod_auth_digest.c =================================================================== --- httpd-2.4.23.orig/modules/aaa/mod_auth_digest.c 2018-03-28 13:32:04.957352504 +0200 +++ httpd-2.4.23/modules/aaa/mod_auth_digest.c 2018-03-28 13:35:12.484784540 +0200 @@ -26,20 +26,13 @@ * reports to the Apache bug-database, or send them directly to me * at ronald@innovation.ch. * - * Requires either /dev/random (or equivalent) or the truerand library, - * available for instance from - * ftp://research.att.com/dist/mab/librand.shar - * * Open Issues: * - qop=auth-int (when streams and trailer support available) * - nonce-format configurability * - Proxy-Authorization-Info header is set by this module, but is * currently ignored by mod_proxy (needs patch to mod_proxy) - * - generating the secret takes a while (~ 8 seconds) if using the - * truerand library * - The source of the secret should be run-time directive (with server - * scope: RSRC_CONF). However, that could be tricky when trying to - * choose truerand vs. file... + * scope: RSRC_CONF) * - shared-mem not completely tested yet. Seems to work ok for me, * but... (definitely won't work on Windoze) * - Sharing a realm among multiple servers has following problems: @@ -52,6 +45,8 @@ * captures a packet sent to one server and sends it to another * one. Should we add "AuthDigestNcCheck Strict"? * - expired nonces give amaya fits. + * - MD5-sess and auth-int are not yet implemented. An incomplete + * implementation has been removed and can be retrieved from svn history. */ #include "apr_sha1.h" @@ -94,7 +89,6 @@ typedef struct digest_config_struct { apr_array_header_t *qop_list; apr_sha1_ctx_t nonce_ctx; apr_time_t nonce_lifetime; - const char *nonce_format; int check_nc; const char *algorithm; char *uri_list; @@ -112,7 +106,8 @@ typedef struct digest_config_struct { #define NONCE_HASH_LEN (2*APR_SHA1_DIGESTSIZE) #define NONCE_LEN (int )(NONCE_TIME_LEN + NONCE_HASH_LEN) -#define SECRET_LEN 20 +#define SECRET_LEN 20 +#define RETAINED_DATA_ID "mod_auth_digest" /* client list definitions */ @@ -121,7 +116,6 @@ typedef struct hash_entry { unsigned long key; /* the key for this entry */ struct hash_entry *next; /* next entry in the bucket */ unsigned long nonce_count; /* for nonce-count checking */ - char ha1[2*APR_MD5_DIGESTSIZE+1]; /* for algorithm=MD5-sess */ char last_nonce[NONCE_LEN+1]; /* for one-time nonce's */ } client_entry; @@ -170,7 +164,7 @@ typedef union time_union { unsigned char arr[sizeof(apr_time_t)]; } time_rec; -static unsigned char secret[SECRET_LEN]; +static unsigned char *secret; /* client-list, opaque, and one-time-nonce stuff */ @@ -228,36 +222,11 @@ static apr_status_t cleanup_tables(void return APR_SUCCESS; } -static apr_status_t initialize_secret(server_rec *s) -{ - apr_status_t status; - - ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, s, APLOGNO(01757) - "generating secret for digest authentication ..."); - -#if APR_HAS_RANDOM - status = apr_generate_random_bytes(secret, sizeof(secret)); -#else -#error APR random number support is missing; you probably need to install the truerand library. -#endif - - if (status != APR_SUCCESS) { - ap_log_error(APLOG_MARK, APLOG_CRIT, status, s, APLOGNO(01758) - "error generating secret"); - return status; - } - - ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(01759) "done"); - - return APR_SUCCESS; -} - static void log_error_and_cleanup(char *msg, apr_status_t sts, server_rec *s) { ap_log_error(APLOG_MARK, APLOG_ERR, sts, s, APLOGNO(01760) - "%s - all nonce-count checking, one-time nonces, and " - "MD5-sess algorithm disabled", msg); - + "%s - all nonce-count checking and one-time nonces" + "disabled", msg); cleanup_tables(NULL); } @@ -377,16 +346,32 @@ static int initialize_tables(server_rec static int pre_init(apr_pool_t *pconf, apr_pool_t *plog, apr_pool_t *ptemp) { apr_status_t rv; + void *retained; rv = ap_mutex_register(pconf, client_mutex_type, NULL, APR_LOCK_DEFAULT, 0); - if (rv == APR_SUCCESS) { - rv = ap_mutex_register(pconf, opaque_mutex_type, NULL, APR_LOCK_DEFAULT, - 0); - } - if (rv != APR_SUCCESS) { - return rv; - } + if (rv != APR_SUCCESS) + return !OK; + rv = ap_mutex_register(pconf, opaque_mutex_type, NULL, APR_LOCK_DEFAULT, 0); + if (rv != APR_SUCCESS) + return !OK; + retained = ap_retained_data_get(RETAINED_DATA_ID); + if (retained == NULL) { + retained = ap_retained_data_create(RETAINED_DATA_ID, SECRET_LEN); + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, NULL, APLOGNO(01757) + "generating secret for digest authentication"); +#if APR_HAS_RANDOM + rv = apr_generate_random_bytes(retained, SECRET_LEN); +#else +#error APR random number support is missing +#endif + if (rv != APR_SUCCESS) { + ap_log_error(APLOG_MARK, APLOG_CRIT, rv, NULL, APLOGNO(01758) + "error generating secret"); + return !OK; + } + } + secret = retained; return OK; } @@ -399,10 +384,6 @@ static int initialize_module(apr_pool_t if (ap_state_query(AP_SQ_MAIN_STATE) == AP_SQ_MS_CREATE_PRE_CONFIG) return OK; - if (initialize_secret(s) != APR_SUCCESS) { - return !OK; - } - #if APR_HAS_SHARED_MEMORY /* Note: this stuff is currently fixed for the lifetime of the server, * i.e. even across restarts. This means that A) any shmem-size @@ -483,6 +464,16 @@ static void *create_digest_dir_config(ap static const char *set_realm(cmd_parms *cmd, void *config, const char *realm) { digest_config_rec *conf = (digest_config_rec *) config; +#ifdef AP_DEBUG + int i; + + /* check that we got random numbers */ + for (i = 0; i < SECRET_LEN; i++) { + if (secret[i] != 0) + break; + } + ap_assert(i < SECRET_LEN); +#endif /* The core already handles the realm, but it's just too convenient to * grab it ourselves too and cache some setups. However, we need to @@ -496,7 +487,7 @@ static const char *set_realm(cmd_parms * * and directives outside a virtual host section) */ apr_sha1_init(&conf->nonce_ctx); - apr_sha1_update_binary(&conf->nonce_ctx, secret, sizeof(secret)); + apr_sha1_update_binary(&conf->nonce_ctx, secret, SECRET_LEN); apr_sha1_update_binary(&conf->nonce_ctx, (const unsigned char *) realm, strlen(realm)); @@ -590,8 +581,7 @@ static const char *set_nonce_lifetime(cm static const char *set_nonce_format(cmd_parms *cmd, void *config, const char *fmt) { - ((digest_config_rec *) config)->nonce_format = fmt; - return "AuthDigestNonceFormat is not implemented (yet)"; + return "AuthDigestNonceFormat is not implemented"; } static const char *set_nc_check(cmd_parms *cmd, void *config, int flag) @@ -612,7 +602,7 @@ static const char *set_algorithm(cmd_par { if (!strcasecmp(alg, "MD5-sess")) { return "AuthDigestAlgorithm: ERROR: algorithm `MD5-sess' " - "is not fully implemented"; + "is not implemented"; } else if (strcasecmp(alg, "MD5")) { return apr_pstrcat(cmd->pool, "Invalid algorithm in AuthDigestAlgorithm: ", alg, NULL); @@ -1138,7 +1128,7 @@ static const char *gen_nonce(apr_pool_t static client_entry *gen_client(const request_rec *r) { unsigned long op; - client_entry new_entry = { 0, NULL, 0, "", "" }, *entry; + client_entry new_entry = { 0, NULL, 0, "" }, *entry; if (!opaque_cntr) { return NULL; @@ -1159,92 +1149,6 @@ static client_entry *gen_client(const re /* - * MD5-sess code. - * - * If you want to use algorithm=MD5-sess you must write get_userpw_hash() - * yourself (see below). The dummy provided here just uses the hash from - * the auth-file, i.e. it is only useful for testing client implementations - * of MD5-sess . - */ - -/* - * get_userpw_hash() will be called each time a new session needs to be - * generated and is expected to return the equivalent of - * - * h_urp = ap_md5(r->pool, - * apr_pstrcat(r->pool, username, ":", ap_auth_name(r), ":", passwd)) - * ap_md5(r->pool, - * (unsigned char *) apr_pstrcat(r->pool, h_urp, ":", resp->nonce, ":", - * resp->cnonce, NULL)); - * - * or put differently, it must return - * - * MD5(MD5(username ":" realm ":" password) ":" nonce ":" cnonce) - * - * If something goes wrong, the failure must be logged and NULL returned. - * - * You must implement this yourself, which will probably consist of code - * contacting the password server with the necessary information (typically - * the username, realm, nonce, and cnonce) and receiving the hash from it. - * - * TBD: This function should probably be in a separate source file so that - * people need not modify mod_auth_digest.c each time they install a new - * version of apache. - */ -static const char *get_userpw_hash(const request_rec *r, - const digest_header_rec *resp, - const digest_config_rec *conf) -{ - return ap_md5(r->pool, - (unsigned char *) apr_pstrcat(r->pool, conf->ha1, ":", resp->nonce, - ":", resp->cnonce, NULL)); -} - - -/* Retrieve current session H(A1). If there is none and "generate" is - * true then a new session for MD5-sess is generated and stored in the - * client struct; if generate is false, or a new session could not be - * generated then NULL is returned (in case of failure to generate the - * failure reason will have been logged already). - */ -static const char *get_session_HA1(const request_rec *r, - digest_header_rec *resp, - const digest_config_rec *conf, - int generate) -{ - const char *ha1 = NULL; - - /* return the current sessions if there is one */ - if (resp->opaque && resp->client && resp->client->ha1[0]) { - return resp->client->ha1; - } - else if (!generate) { - return NULL; - } - - /* generate a new session */ - if (!resp->client) { - resp->client = gen_client(r); - } - if (resp->client) { - ha1 = get_userpw_hash(r, resp, conf); - if (ha1) { - memcpy(resp->client->ha1, ha1, sizeof(resp->client->ha1)); - } - } - - return ha1; -} - - -static void clear_session(const digest_header_rec *resp) -{ - if (resp->client) { - resp->client->ha1[0] = '\0'; - } -} - -/* * Authorization challenge generation code (for WWW-Authenticate) */ @@ -1282,8 +1186,7 @@ static void note_digest_auth_failure(req if (resp->opaque == NULL) { /* new client */ - if ((conf->check_nc || conf->nonce_lifetime == 0 - || !strcasecmp(conf->algorithm, "MD5-sess")) + if ((conf->check_nc || conf->nonce_lifetime == 0) && (resp->client = gen_client(r)) != NULL) { opaque = ltox(r->pool, resp->client->key); } @@ -1323,15 +1226,6 @@ static void note_digest_auth_failure(req memcpy(resp->client->last_nonce, nonce, NONCE_LEN+1); } - /* Setup MD5-sess stuff. Note that we just clear out the session - * info here, since we can't generate a new session until the request - * from the client comes in with the cnonce. - */ - - if (!strcasecmp(conf->algorithm, "MD5-sess")) { - clear_session(resp); - } - /* setup domain attribute. We want to send this attribute wherever * possible so that the client won't send the Authorization header * unnecessarily (it's usually > 200 bytes!). @@ -1597,24 +1491,9 @@ static const char *new_digest(const requ { const char *ha1, *ha2, *a2; - if (resp->algorithm && !strcasecmp(resp->algorithm, "MD5-sess")) { - ha1 = get_session_HA1(r, resp, conf, 1); - if (!ha1) { - return NULL; - } - } - else { - ha1 = conf->ha1; - } + ha1 = conf->ha1; - if (resp->message_qop && !strcasecmp(resp->message_qop, "auth-int")) { - a2 = apr_pstrcat(r->pool, resp->method, ":", resp->uri, ":", - ap_md5(r->pool, (const unsigned char*) ""), NULL); - /* TBD */ - } - else { - a2 = apr_pstrcat(r->pool, resp->method, ":", resp->uri, NULL); - } + a2 = apr_pstrcat(r->pool, resp->method, ":", resp->uri, NULL); ha2 = ap_md5(r->pool, (const unsigned char *)a2); return ap_md5(r->pool, @@ -1862,8 +1741,7 @@ static int authenticate_digest_user(requ } if (resp->algorithm != NULL - && strcasecmp(resp->algorithm, "MD5") - && strcasecmp(resp->algorithm, "MD5-sess")) { + && strcasecmp(resp->algorithm, "MD5")) { ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01789) "unknown algorithm `%s' received: %s", resp->algorithm, r->uri); @@ -2015,27 +1893,9 @@ static int add_auth_info(request_rec *r) /* calculate rspauth attribute */ - if (resp->algorithm && !strcasecmp(resp->algorithm, "MD5-sess")) { - ha1 = get_session_HA1(r, resp, conf, 0); - if (!ha1) { - ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01795) - "internal error: couldn't find session " - "info for user %s", resp->username); - return !OK; - } - } - else { - ha1 = conf->ha1; - } + ha1 = conf->ha1; - if (resp->message_qop && !strcasecmp(resp->message_qop, "auth-int")) { - a2 = apr_pstrcat(r->pool, ":", resp->uri, ":", - ap_md5(r->pool,(const unsigned char *) ""), NULL); - /* TBD */ - } - else { - a2 = apr_pstrcat(r->pool, ":", resp->uri, NULL); - } + a2 = apr_pstrcat(r->pool, ":", resp->uri, NULL); ha2 = ap_md5(r->pool, (const unsigned char *)a2); resp_dig = ap_md5(r->pool,
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