rlm_detail.c

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/*
 *   This program is is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or (at
 *   your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
/**
 * $Id: 0c39266cde0a24c090a0698f92ce541dccd4fc07 $
 * @file rlm_detail.c
 * @brief Write plaintext versions of packets to flatfiles.
 *
 * @copyright 2000,2006 The FreeRADIUS server project
 */
RCSID("$Id: 0c39266cde0a24c090a0698f92ce541dccd4fc07 $")
 
#include <freeradius-devel/server/base.h>
#include <freeradius-devel/server/cf_util.h>
#include <freeradius-devel/server/exfile.h>
#include <freeradius-devel/server/module_rlm.h>
#include <freeradius-devel/util/debug.h>
#include <freeradius-devel/util/perm.h>
 
#include <ctype.h>
#include <fcntl.h>
#include <sys/stat.h>
 
#ifdef HAVE_UNISTD_H
#  include <unistd.h>
#endif
 
#ifdef HAVE_GRP_H
#  include <grp.h>
#endif
 
/** Instance configuration for rlm_detail
 *
 * Holds the configuration and preparsed data for a instance of rlm_detail.
 */
typedef struct {
        uint32_t        perm;           //!< Permissions to use for new files.
        gid_t           group;          //!< Resolved group.
        bool            group_is_set;   //!< Whether group was set.
 
        bool            locking;        //!< Whether the file should be locked.
 
        bool            log_srcdst;     //!< Add IP src/dst attributes to entries.
 
        bool            escape;         //!< do filename escaping, yes / no
 
        exfile_t        *ef;            //!< Log file handler
} rlm_detail_t;
 
typedef struct {
        fr_value_box_t  filename;       //!< File / path to write to.
        tmpl_t          *filename_tmpl; //!< tmpl used to expand filename (for debug output)
        fr_value_box_t  header;         //!< Header format
        fr_hash_table_t *ht;            //!< Holds suppressed attributes.
} rlm_detail_env_t;
 
int detail_group_parse(UNUSED TALLOC_CTX *ctx, void *out, void *parent,
                       CONF_ITEM *ci, conf_parser_t const *rule);
 
static const conf_parser_t module_config[] = {
        { FR_CONF_OFFSET("permissions", rlm_detail_t, perm), .dflt = "0600" },
        { FR_CONF_OFFSET_IS_SET("group", FR_TYPE_VOID, 0, rlm_detail_t, group), .func = detail_group_parse },
        { FR_CONF_OFFSET("locking", rlm_detail_t, locking), .dflt = "no" },
        { FR_CONF_OFFSET("escape_filenames", rlm_detail_t, escape), .dflt = "no" },
        { FR_CONF_OFFSET("log_packet_header", rlm_detail_t, log_srcdst), .dflt = "no" },
        CONF_PARSER_TERMINATOR
};
 
static fr_dict_t const *dict_freeradius;
static fr_dict_t const *dict_radius;
 
extern fr_dict_autoload_t rlm_detail_dict[];
fr_dict_autoload_t rlm_detail_dict[] = {
        { .out = &dict_freeradius, .proto = "freeradius" },
        { .out = &dict_radius, .proto = "radius" },
        { NULL }
};
 
static fr_dict_attr_t const *attr_net;
static fr_dict_attr_t const *attr_net_src_address;
static fr_dict_attr_t const *attr_net_dst_address;
static fr_dict_attr_t const *attr_net_src_port;
static fr_dict_attr_t const *attr_net_dst_port;
static fr_dict_attr_t const *attr_protocol;
 
static fr_dict_attr_t const *attr_user_password;
 
extern fr_dict_attr_autoload_t rlm_detail_dict_attr[];
fr_dict_attr_autoload_t rlm_detail_dict_attr[] = {
        { .out = &attr_net, .name = "Net", .type = FR_TYPE_TLV, .dict = &dict_freeradius },
        { .out = &attr_net_dst_address, .name = "Net.Dst.IP", .type = FR_TYPE_COMBO_IP_ADDR, .dict = &dict_freeradius },
        { .out = &attr_net_dst_port, .name = "Net.Dst.Port", .type = FR_TYPE_UINT16, .dict = &dict_freeradius },
        { .out = &attr_net_src_address, .name = "Net.Src.IP", .type = FR_TYPE_COMBO_IP_ADDR, .dict = &dict_freeradius },
        { .out = &attr_net_src_port, .name = "Net.Src.Port", .type = FR_TYPE_UINT16, .dict = &dict_freeradius },
        { .out = &attr_protocol, .name = "Protocol", .type = FR_TYPE_UINT32, .dict = &dict_freeradius },
 
        { .out = &attr_user_password, .name = "User-Password", .type = FR_TYPE_STRING, .dict = &dict_radius },
 
        { NULL }
};
 
/** Print one attribute and value to FP
 *
 * Complete string with '\\t' and '\\n' is written to buffer before printing to
 * avoid issues when running with multiple threads.
 *
 * @todo - This function should print *flattened* lists.
 *
 * @param fp to output to.
 * @param vp to print.
 */
static void CC_HINT(nonnull) fr_pair_fprint(FILE *fp, fr_pair_t const *vp)
{
        char            buff[1024];
        fr_sbuff_t      sbuff = FR_SBUFF_OUT(buff, sizeof(buff));
 
        PAIR_VERIFY(vp);
 
        (void) fr_sbuff_in_char(&sbuff, '\t');
        (void) fr_pair_print(&sbuff, NULL, vp);
        (void) fr_sbuff_in_char(&sbuff, '\n');
 
        fputs(buff, fp);
}
 
 
 
/** Generic function for parsing conf pair values as int
 *
 * @note This should be used for enum types as c99 6.4.4.3 states that the enumeration
 * constants are of type int.
 *
 */
int detail_group_parse(UNUSED TALLOC_CTX *ctx, void *out, void *parent,
                       CONF_ITEM *ci, UNUSED conf_parser_t const *rule)
{
        char const                      *group;
        char                            *endptr;
        gid_t                           gid;
 
        group = cf_pair_value(cf_item_to_pair(ci));
        gid = strtol(group, &endptr, 10);
        if (*endptr != '\0') {
                if (fr_perm_gid_from_str(parent, &gid, group) < 0) {
                        cf_log_err(ci, "Unable to find system group '%s'", group);
                        return -1;
                }
        }
        *((gid_t *)out) = gid;
 
        return 0;
}
 
static uint32_t detail_hash(void const *data)
{
        fr_dict_attr_t const *da = data;
        return fr_hash(&da, sizeof(da));
}
 
static int8_t detail_cmp(void const *a, void const *b)
{
        return CMP(a, b);
}
 
/*
 *      (Re-)read radiusd.conf into memory.
 */
static int mod_instantiate(module_inst_ctx_t const *mctx)
{
        rlm_detail_t    *inst = talloc_get_type_abort(mctx->inst->data, rlm_detail_t);
        CONF_SECTION    *conf = mctx->inst->conf;
 
        inst->ef = module_rlm_exfile_init(inst, conf, 256, fr_time_delta_from_sec(30), inst->locking, NULL, NULL);
        if (!inst->ef) {
                cf_log_err(conf, "Failed creating log file context");
                return -1;
        }
 
        return 0;
}
 
/*
 *      Wrapper for VPs allocated on the stack.
 */
static void detail_fr_pair_fprint(TALLOC_CTX *ctx, FILE *out, fr_pair_t const *stacked)
{
        fr_pair_t *vp;
 
        vp = fr_pair_copy(ctx, stacked);
        if (unlikely(vp == NULL)) return;
 
        vp->op = T_OP_EQ;
        fr_pair_fprint(out, vp);
        talloc_free(vp);
}
 
 
/** Write a single detail entry to file pointer
 *
 * @param[in] out Where to write entry.
 * @param[in] inst Instance of rlm_detail.
 * @param[in] request The current request.
 * @param[in] header To print above packet
 * @param[in] packet associated with the request (request, reply...).
 * @param[in] list of pairs to write.
 * @param[in] compat Write out entry in compatibility mode.
 * @param[in] ht Hash table containing attributes to be suppressed in the output.
 */
static int detail_write(FILE *out, rlm_detail_t const *inst, request_t *request, fr_value_box_t *header,
                        fr_packet_t *packet, fr_pair_list_t *list, bool compat, fr_hash_table_t *ht)
{
        if (fr_pair_list_empty(list)) {
                RWDEBUG("Skipping empty packet");
                return 0;
        }
 
#define WRITE(fmt, ...) do {\
        if (fprintf(out, fmt, ## __VA_ARGS__) < 0) {\
                RERROR("Failed writing to detail file: %s", fr_syserror(errno));\
                return -1;\
        }\
} while(0)
 
        WRITE("%s\n", header->vb_strvalue);
 
        /*
         *      Write the information to the file.
         */
        if (!compat) {
                fr_dict_attr_t const *da;
                char const *name = NULL;
 
                da = fr_dict_attr_by_name(NULL, fr_dict_root(request->dict), "Packet-Type");
                if (da) name = fr_dict_enum_name_by_value(da, fr_box_uint32(packet->code));
 
                /*
                 *      Print out names, if they're OK.
                 *      Numbers, if not.
                 */
                if (name) {
                        WRITE("\tPacket-Type = %s\n", name);
                } else {
                        WRITE("\tPacket-Type = %u\n", packet->code);
                }
        }
 
        /*
         *      Put these at the top as distinct (not nested) VPs.
         */
        if (inst->log_srcdst) {
                fr_pair_t *src_vp, *dst_vp;
 
                src_vp = fr_pair_find_by_da_nested(&request->control_pairs, NULL, attr_net_src_address);
                dst_vp = fr_pair_find_by_da_nested(&request->control_pairs, NULL, attr_net_dst_address);
 
                /*
                 *      These pairs will exist, but Coverity doesn't know that
                 */
                if (src_vp) detail_fr_pair_fprint(request, out, src_vp);
                if (dst_vp) detail_fr_pair_fprint(request, out, dst_vp);
 
                src_vp = fr_pair_find_by_da_nested(&request->control_pairs, NULL, attr_net_src_port);
                dst_vp = fr_pair_find_by_da_nested(&request->control_pairs, NULL, attr_net_dst_port);
 
                if (src_vp) detail_fr_pair_fprint(request, out, src_vp);
                if (dst_vp) detail_fr_pair_fprint(request, out, dst_vp);
        }
 
        /* Write each attribute/value to the log file */
        fr_pair_list_foreach_leaf(list, vp) {
                if (ht && fr_hash_table_find(ht, vp->da)) continue;
 
                /*
                 *      Skip Net.* if we're not logging src/dst
                 */
                if (!inst->log_srcdst && (fr_dict_by_da(vp->da) == dict_freeradius)) {
                        fr_dict_attr_t const *da = vp->da;
 
                        while (da->depth > attr_net->depth) {
                                da = da->parent;
                        }
 
                        if (da == attr_net) continue;
                }
 
                /*
                 *      Don't print passwords in old format...
                 */
                if (compat && (vp->da == attr_user_password)) continue;
 
                fr_pair_fprint(out, vp);
        }
 
        /*
         *      Add the original protocol of the request, this should
         *      be used by the detail reader to set the default
         *      dictionary used for decoding.
         */
//      WRITE("\t%s = %s", attr_protocol->name, fr_dict_root(request->dict)->name);
        WRITE("\tTimestamp = %lu\n", (unsigned long) fr_time_to_sec(request->packet->timestamp));
 
        WRITE("\n");
 
        return 0;
}
 
/*
 *      Do detail, compatible with old accounting
 */
static unlang_action_t CC_HINT(nonnull) detail_do(rlm_rcode_t *p_result, module_ctx_t const *mctx, request_t *request,
                                                  fr_packet_t *packet, fr_pair_list_t *list,
                                                  bool compat)
{
        rlm_detail_env_t        *env = talloc_get_type_abort(mctx->env_data, rlm_detail_env_t);
        int                     outfd, dupfd;
        FILE                    *outfp = NULL;
 
        rlm_detail_t const *inst = talloc_get_type_abort_const(mctx->inst->data, rlm_detail_t);
 
        RDEBUG2("%s expands to %pV", env->filename_tmpl->name, &env->filename);
 
        outfd = exfile_open(inst->ef, env->filename.vb_strvalue, inst->perm, NULL);
        if (outfd < 0) {
                RPERROR("Couldn't open file %pV", &env->filename);
                *p_result = RLM_MODULE_FAIL;
                /* coverity[missing_unlock] */
                return UNLANG_ACTION_CALCULATE_RESULT;
        }
 
        if (inst->group_is_set) {
                if (chown(env->filename.vb_strvalue, -1, inst->group) == -1) {
                        RERROR("Unable to set detail file group to '%d': %s", inst->group, fr_syserror(errno));
                        goto fail;
                }
        }
 
        dupfd = dup(outfd);
        if (dupfd < 0) {
                RERROR("Failed to dup() file descriptor for detail file");
                goto fail;
        }
 
        /*
         *      Open the output fp for buffering.
         */
        if ((outfp = fdopen(dupfd, "a")) == NULL) {
                RERROR("Couldn't open file %pV: %s", &env->filename, fr_syserror(errno));
        fail:
                if (outfp) fclose(outfp);
                exfile_close(inst->ef, outfd);
                RETURN_MODULE_FAIL;
        }
 
        if (detail_write(outfp, inst, request, &env->header, packet, list, compat, env->ht) < 0) goto fail;
 
        /*
         *      Flush everything
         */
        fclose(outfp);
        exfile_close(inst->ef, outfd);
 
        /*
         *      And everything is fine.
         */
        RETURN_MODULE_OK;
}
 
/*
 *      Accounting - write the detail files.
 */
static unlang_action_t CC_HINT(nonnull) mod_accounting(rlm_rcode_t *p_result, module_ctx_t const *mctx, request_t *request)
{
        return detail_do(p_result, mctx, request, request->packet, &request->request_pairs, true);
}
 
/*
 *      Incoming Access Request - write the detail files.
 */
static unlang_action_t CC_HINT(nonnull) mod_authorize(rlm_rcode_t *p_result, module_ctx_t const *mctx, request_t *request)
{
        return detail_do(p_result, mctx, request, request->packet, &request->request_pairs, false);
}
 
/*
 *      Outgoing Access-Request Reply - write the detail files.
 */
static unlang_action_t CC_HINT(nonnull) mod_post_auth(rlm_rcode_t *p_result, module_ctx_t const *mctx, request_t *request)
{
        return detail_do(p_result, mctx, request, request->reply, &request->reply_pairs, false);
}
 
static int call_env_filename_parse(TALLOC_CTX *ctx, void *out, tmpl_rules_t const *t_rules, CONF_ITEM *ci,
                                   UNUSED char const *section_name1, UNUSED char const *section_name2,
                                   void const *data, UNUSED call_env_parser_t const *rule)
{
        rlm_detail_t const      *inst = talloc_get_type_abort_const(data, rlm_detail_t);
        tmpl_t                  *parsed;
        CONF_PAIR const         *to_parse = cf_item_to_pair(ci);
        tmpl_rules_t            our_rules;
 
        our_rules = *t_rules;
        our_rules.escape.func = (inst->escape) ? rad_filename_box_escape : rad_filename_box_make_safe;
        our_rules.escape.safe_for = (inst->escape) ? (fr_value_box_safe_for_t)rad_filename_box_escape :
                                                     (fr_value_box_safe_for_t)rad_filename_box_make_safe;
        our_rules.escape.mode = TMPL_ESCAPE_PRE_CONCAT;
        our_rules.literals_safe_for = our_rules.escape.safe_for;
 
        if (tmpl_afrom_substr(ctx, &parsed,
                              &FR_SBUFF_IN(cf_pair_value(to_parse), talloc_array_length(cf_pair_value(to_parse)) - 1),
                              cf_pair_value_quote(to_parse), NULL, &our_rules) < 0) return -1;
 
        *(void **)out = parsed;
        return 0;
}
 
static int call_env_suppress_parse(TALLOC_CTX *ctx, call_env_parsed_head_t *out, tmpl_rules_t const *t_rules,
                                   CONF_ITEM *ci, UNUSED char const *section_name1, UNUSED char const *section_name2,
                                   UNUSED void const *data, UNUSED call_env_parser_t const *rule)
{
        CONF_SECTION const      *cs = cf_item_to_section(ci);
        CONF_SECTION const      *parent = cf_item_to_section(cf_parent(ci));
        call_env_parsed_t       *parsed;
        CONF_ITEM const         *to_parse = NULL;
        char const              *attr;
        fr_dict_attr_t const    *da;
        fr_hash_table_t         *ht;
 
        MEM(parsed = call_env_parsed_add(ctx, out,
                                         &(call_env_parser_t) { FR_CALL_ENV_PARSE_ONLY_OFFSET("suppress", FR_TYPE_VOID, 0, rlm_detail_env_t, ht )}));
 
        ht = fr_hash_table_alloc(parsed, detail_hash, detail_cmp, NULL);
 
        while ((to_parse = cf_item_next(cs, to_parse))) {
                if (!cf_item_is_pair(to_parse)) continue;
 
                attr = cf_pair_attr(cf_item_to_pair(to_parse));
                if (!attr) continue;
 
                da = fr_dict_attr_search_by_qualified_oid(NULL, t_rules->attr.dict_def, attr, false, false);
                if (!da) {
                        cf_log_perr(to_parse, "Failed resolving attribute");
                        return -1;
                }
 
                /*
                 *      Be kind to minor mistakes
                 */
                if (fr_hash_table_find(ht, da)) {
                        cf_log_warn(to_parse, "Ignoring duplicate entry '%s'", attr);
                        continue;
                }
 
                if (!fr_hash_table_insert(ht, da)) {
                        cf_log_perr(to_parse, "Failed inserting '%s' into suppression table", attr);
                        return -1;
                }
 
                DEBUG("%s - '%s' suppressed, will not appear in detail output", cf_section_name(parent), attr);
        }
 
        /*
         *      Clear up if nothing is actually to be suppressed
         */
        if (fr_hash_table_num_elements(ht) == 0) {
                talloc_free(ht);
                call_env_parsed_free(out, parsed);
                return 0;
        }
 
        fr_hash_table_fill(ht);
        call_env_parsed_set_data(parsed, ht);
 
        return 0;
}
 
static const call_env_method_t method_env = {
        FR_CALL_ENV_METHOD_OUT(rlm_detail_env_t),
        .env = (call_env_parser_t[]){
                { FR_CALL_ENV_PARSE_OFFSET("filename", FR_TYPE_STRING, CALL_ENV_FLAG_REQUIRED, rlm_detail_env_t, filename, filename_tmpl),
                  .pair.func =  call_env_filename_parse },
                { FR_CALL_ENV_OFFSET("header", FR_TYPE_STRING, CALL_ENV_FLAG_CONCAT, rlm_detail_env_t, header),
                  .pair.dflt = "%t", .pair.dflt_quote = T_DOUBLE_QUOTED_STRING },
                { FR_CALL_ENV_SUBSECTION_FUNC("suppress", NULL, CALL_ENV_FLAG_NONE, call_env_suppress_parse) },
                CALL_ENV_TERMINATOR
        }
};
 
/* globally exported name */
extern module_rlm_t rlm_detail;
module_rlm_t rlm_detail = {
        .common = {
                .magic          = MODULE_MAGIC_INIT,
                .name           = "detail",
                .inst_size      = sizeof(rlm_detail_t),
                .config         = module_config,
                .instantiate    = mod_instantiate
        },
        .method_names = (module_method_name_t[]){
                { .name1 = "recv",              .name2 = "accounting-request",  .method = mod_accounting,
                  .method_env = &method_env },
                { .name1 = "recv",              .name2 = CF_IDENT_ANY,          .method = mod_authorize,
                  .method_env = &method_env },
                { .name1 = "accounting",        .name2 = CF_IDENT_ANY,          .method = mod_accounting,
                  .method_env = &method_env },
                { .name1 = "send",              .name2 = CF_IDENT_ANY,          .method = mod_post_auth,
                  .method_env = &method_env },
                MODULE_NAME_TERMINATOR
        }
};