diff options
Diffstat (limited to 'src/http/modules/ngx_http_userid_filter.c')
-rw-r--r-- | src/http/modules/ngx_http_userid_filter.c | 506 |
1 files changed, 506 insertions, 0 deletions
diff --git a/src/http/modules/ngx_http_userid_filter.c b/src/http/modules/ngx_http_userid_filter.c new file mode 100644 index 000000000..9229a2b66 --- /dev/null +++ b/src/http/modules/ngx_http_userid_filter.c @@ -0,0 +1,506 @@ + +#include <ngx_config.h> +#include <ngx_core.h> +#include <ngx_http.h> + + +#define NGX_HTTP_USERID_OFF 0 +#define NGX_HTTP_USERID_LOG 1 +#define NGX_HTTP_USERID_V1 2 +#define NGX_HTTP_USERID_ON 3 + +/* 31 Dec 2037 23:55:55 GMT */ +#define NGX_HTTP_USERID_MAX_EXPIRES 2145916555 + + +typedef struct { + ngx_flag_t enable; + + ngx_int_t service; + + ngx_str_t name; + ngx_str_t domain; + ngx_str_t path; + time_t expires; + + ngx_int_t p3p; + ngx_str_t p3p_string; +} ngx_http_userid_conf_t; + + +typedef struct { + uint32_t uid_got[4]; + uint32_t uid_set[4]; +} ngx_http_userid_ctx_t; + + +static ngx_int_t ngx_http_userid_get_uid(ngx_http_request_t *r, + ngx_http_userid_ctx_t *ctx, + ngx_http_userid_conf_t *conf); +static ngx_int_t ngx_http_userid_set_uid(ngx_http_request_t *r, + ngx_http_userid_ctx_t *ctx, + ngx_http_userid_conf_t *conf); + +static u_char *ngx_http_userid_log_uid_got(ngx_http_request_t *r, u_char *buf, + uintptr_t data); +static u_char *ngx_http_userid_log_uid_set(ngx_http_request_t *r, u_char *buf, + uintptr_t data); + +static ngx_int_t ngx_http_userid_pre_conf(ngx_conf_t *cf); +static void *ngx_http_userid_create_conf(ngx_conf_t *cf); +static char *ngx_http_userid_merge_conf(ngx_conf_t *cf, void *parent, + void *child); +static ngx_int_t ngx_http_userid_init(ngx_cycle_t *cycle); + + +static uint32_t sequencer_v1 = 1; +static uint32_t sequencer_v2 = 0x03030302; + + +static u_char expires[] = "; expires=Thu, 31-Dec-37 23:55:55 GMT"; + + +static ngx_http_output_header_filter_pt ngx_http_next_header_filter; + + +static ngx_conf_enum_t ngx_http_userid_state[] = { + { ngx_string("off"), NGX_HTTP_USERID_OFF }, + { ngx_string("log"), NGX_HTTP_USERID_LOG }, + { ngx_string("v1"), NGX_HTTP_USERID_V1 }, + { ngx_string("on"), NGX_HTTP_USERID_ON }, + { ngx_null_string, 0 } +}; + + +static ngx_command_t ngx_http_userid_commands[] = { + + { ngx_string("userid"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, + ngx_conf_set_enum_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_userid_conf_t, enable), + ngx_http_userid_state}, + + { ngx_string("userid_service"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG, + ngx_conf_set_num_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_userid_conf_t, service), + NULL}, + + { ngx_string("userid_name"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG, + ngx_conf_set_str_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_userid_conf_t, name), + NULL}, + + { ngx_string("userid_domain"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG, + ngx_conf_set_str_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_userid_conf_t, domain), + NULL}, + + { ngx_string("userid_path"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG, + ngx_conf_set_str_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_userid_conf_t, path), + NULL}, + + { ngx_string("userid_expires"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, + ngx_conf_set_sec_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_userid_conf_t, expires), + NULL}, + + ngx_null_command +}; + + +ngx_http_module_t ngx_http_userid_filter_module_ctx = { + ngx_http_userid_pre_conf, /* pre conf */ + + NULL, /* create main configuration */ + NULL, /* init main configuration */ + + NULL, /* create server configuration */ + NULL, /* merge server configuration */ + + ngx_http_userid_create_conf, /* create location configration */ + ngx_http_userid_merge_conf /* merge location configration */ +}; + + +ngx_module_t ngx_http_userid_filter_module = { + NGX_MODULE, + &ngx_http_userid_filter_module_ctx, /* module context */ + ngx_http_userid_commands, /* module directives */ + NGX_HTTP_MODULE, /* module type */ + ngx_http_userid_init, /* init module */ + NULL /* init process */ +}; + + +static ngx_http_log_op_name_t ngx_http_userid_log_fmt_ops[] = { + { ngx_string("uid_got"), 0, ngx_http_userid_log_uid_got }, + { ngx_string("uid_set"), 0, ngx_http_userid_log_uid_set }, + { ngx_null_string, 0, NULL } +}; + + +static ngx_int_t ngx_http_userid_filter(ngx_http_request_t *r) +{ + ngx_int_t rc; + ngx_http_userid_ctx_t *ctx; + ngx_http_userid_conf_t *conf; + + conf = ngx_http_get_module_loc_conf(r, ngx_http_userid_filter_module); + + if (conf->enable == NGX_HTTP_USERID_OFF) { + return ngx_http_next_header_filter(r); + } + + ngx_http_create_ctx(r, ctx, ngx_http_userid_filter_module, + sizeof(ngx_http_userid_ctx_t), + NGX_HTTP_INTERNAL_SERVER_ERROR); + + rc = ngx_http_userid_get_uid(r, ctx, conf); + + if (rc != NGX_OK) { + return rc; + } + + if (conf->enable == NGX_HTTP_USERID_LOG /* || ctx->uid_got[3] != 0 */) { + return NGX_OK; + } + + rc = ngx_http_userid_set_uid(r, ctx, conf); + + if (rc != NGX_OK) { + return rc; + } + + return ngx_http_next_header_filter(r); +} + + +static ngx_int_t ngx_http_userid_get_uid(ngx_http_request_t *r, + ngx_http_userid_ctx_t *ctx, + ngx_http_userid_conf_t *conf) +{ + u_char *start, *last, *end; + ngx_uint_t *cookies, i; + ngx_str_t src, dst; + ngx_table_elt_t *headers; + + headers = r->headers_in.headers.elts; + cookies = r->headers_in.cookies.elts; + + for (i = 0; i < r->headers_in.cookies.nelts; i++) { + ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "cookie: %d:\"%s\"", + cookies[i], + headers[cookies[i]].value.data); + + end = headers[cookies[i]].value.data + headers[cookies[i]].value.len; + + for (start = headers[cookies[i]].value.data; start < end; /* void */) { + + if (conf->name.len >= headers[cookies[i]].value.len + || ngx_strncmp(start, conf->name.data, conf->name.len) != 0) + { + start += conf->name.len; + while (start < end && *start++ != ';') { /* void */ } + + for (/* void */; start < end && *start == ' '; start++) { /**/ } + + continue; + } + + for (start += conf->name.len; start < end && *start == ' '; start++) + { + /* void */ + } + + if (*start != '=') { + break; + } + + for (start++; start < end && *start == ' '; start++) { /* void */ } + + for (last = start; last < end && *last != ';'; last++) { /**/ } + + if (last - start < 22) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "client sent too short userid cookie \"%s\"", + headers[cookies[i]].value.data); + break; + } + + /* + * we have to limit encoded string to 22 characters + * because there are already the millions cookies with a garbage + * instead of the correct base64 trail "==" + */ + + src.len = 22; + src.data = start; + dst.data = (u_char *) ctx->uid_got; + + if (ngx_decode_base64(&src, &dst) == NGX_ERROR) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "client sent invalid userid cookie \"%s\"", + headers[cookies[i]].value.data); + break; + } + + ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "uid: %08X%08X%08X%08X", + ctx->uid_got[0], ctx->uid_got[1], + ctx->uid_got[2], ctx->uid_got[3]); + + return NGX_OK; + } + } + + return NGX_OK; +} + + +static ngx_int_t ngx_http_userid_set_uid(ngx_http_request_t *r, + ngx_http_userid_ctx_t *ctx, + ngx_http_userid_conf_t *conf) + +{ + u_char *cookie, *p; + size_t len; + ngx_str_t src, dst; + ngx_table_elt_t *set_cookie; + + /* TODO: mutex for sequencers */ + + if (conf->enable == NGX_HTTP_USERID_V1) { + ctx->uid_set[0] = conf->service; + ctx->uid_set[1] = ngx_time(); + ctx->uid_set[2] = ngx_pid; + ctx->uid_set[3] = sequencer_v1; + sequencer_v1 += 0x100; + + } else { + ctx->uid_set[0] = htonl(conf->service); + ctx->uid_set[1] = htonl(ngx_time()); + ctx->uid_set[2] = htonl(ngx_pid); + ctx->uid_set[3] = htonl(sequencer_v2); + sequencer_v2 += 0x100; + if (sequencer_v2 < 0x03030302) { + sequencer_v2 = 0x03030302; + } + } + + len = conf->name.len + 1 + ngx_base64_encoded_length(16) + 1; + + if (conf->expires) { + len += sizeof(expires) - 1 + 2; + } + + if (conf->domain.len > 1) { + len += sizeof("; domain=") - 1 + conf->domain.len; + } + + if (conf->path.len) { + len += sizeof("; path=") - 1 + conf->path.len; + } + + if (!(cookie = ngx_palloc(r->pool, len))) { + return NGX_HTTP_INTERNAL_SERVER_ERROR; + } + + p = ngx_cpymem(cookie, conf->name.data, conf->name.len); + *p++ = '='; + + src.len = 16; + src.data = (u_char *) ctx->uid_set; + dst.data = p; + + ngx_encode_base64(&src, &dst); + + p += dst.len; + + if (conf->expires == NGX_HTTP_USERID_MAX_EXPIRES) { + p = ngx_cpymem(p, expires, sizeof(expires) - 1); + + } else if (conf->expires) { + p = ngx_cpymem(p, expires, sizeof("; expires=") - 1); + p += ngx_http_cookie_time(p, ngx_time() + conf->expires); + } + + if (conf->domain.len > 1) { + p = ngx_cpymem(p, "; domain=", sizeof("; domain=") - 1); + p = ngx_cpymem(p, conf->domain.data, conf->domain.len); + } + + if (conf->path.len) { + p = ngx_cpymem(p, "; path=", sizeof("; path=") - 1); + p = ngx_cpymem(p, conf->path.data, conf->path.len); + } + + *p = '\0'; + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "uid cookie: \"%s\"", cookie); + + set_cookie = ngx_http_add_header(&r->headers_out, ngx_http_headers_out); + if (set_cookie == NULL) { + return NGX_HTTP_INTERNAL_SERVER_ERROR; + } + + set_cookie->key.len = sizeof("Set-Cookie") - 1; + set_cookie->key.data = (u_char *) "Set-Cookie"; + set_cookie->value.len = p - cookie; + set_cookie->value.data = cookie; + + return NGX_OK; +} + + +static u_char *ngx_http_userid_log_uid_got(ngx_http_request_t *r, u_char *buf, + uintptr_t data) +{ + ngx_http_userid_ctx_t *ctx; + ngx_http_userid_conf_t *conf; + + ctx = ngx_http_get_module_ctx(r, ngx_http_userid_filter_module); + + if (ctx == NULL || ctx->uid_got[3] == 0) { + if (buf == NULL) { + return (u_char *) 1; + } + + *buf = '-'; + return buf + 1; + } + + conf = ngx_http_get_module_loc_conf(r, ngx_http_userid_filter_module); + + if (buf == NULL) { + return (u_char *) (conf->name.len + 1 + 32); + } + + buf = ngx_cpymem(buf, conf->name.data, conf->name.len); + + *buf++ = '='; + + return buf + ngx_snprintf((char *) buf, 33, "%08X%08X%08X%08X", + ctx->uid_got[0], ctx->uid_got[1], + ctx->uid_got[2], ctx->uid_got[3]); +} + + +static u_char *ngx_http_userid_log_uid_set(ngx_http_request_t *r, u_char *buf, + uintptr_t data) +{ + ngx_http_userid_ctx_t *ctx; + ngx_http_userid_conf_t *conf; + + ctx = ngx_http_get_module_ctx(r, ngx_http_userid_filter_module); + + if (ctx == NULL || ctx->uid_set[3] == 0) { + if (buf == NULL) { + return (u_char *) 1; + } + + *buf = '-'; + return buf + 1; + } + + conf = ngx_http_get_module_loc_conf(r, ngx_http_userid_filter_module); + + if (buf == NULL) { + return (u_char *) (conf->name.len + 1 + 32); + } + + buf = ngx_cpymem(buf, conf->name.data, conf->name.len); + + *buf++ = '='; + + return buf + ngx_snprintf((char *) buf, 33, "%08X%08X%08X%08X", + ctx->uid_set[0], ctx->uid_set[1], + ctx->uid_set[2], ctx->uid_set[3]); +} + + +static ngx_int_t ngx_http_userid_pre_conf(ngx_conf_t *cf) +{ + ngx_http_log_op_name_t *op; + + for (op = ngx_http_userid_log_fmt_ops; op->name.len; op++) { /* void */ } + op->op = NULL; + + op = ngx_http_log_fmt_ops; + + for (op = ngx_http_log_fmt_ops; op->op; op++) { + if (op->name.len == 0) { + op = (ngx_http_log_op_name_t *) op->op; + } + } + + op->op = (ngx_http_log_op_pt) ngx_http_userid_log_fmt_ops; + + return NGX_OK; +} + + +static void *ngx_http_userid_create_conf(ngx_conf_t *cf) +{ + ngx_http_userid_conf_t *conf; + + if (!(conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_userid_conf_t)))) { + return NGX_CONF_ERROR; + } + + /* set by ngx_pcalloc(): + + conf->name.len = 0; + conf->name.date = NULL; + conf->domain.len = 0; + conf->domain.date = NULL; + conf->path.len = 0; + conf->path.date = NULL; + + */ + + conf->enable = NGX_CONF_UNSET; + conf->expires = NGX_CONF_UNSET; + + return conf; +} + + +static char *ngx_http_userid_merge_conf(ngx_conf_t *cf, void *parent, + void *child) +{ + ngx_http_userid_conf_t *prev = parent; + ngx_http_userid_conf_t *conf = child; + + ngx_conf_merge_value(conf->enable, prev->enable, NGX_HTTP_USERID_OFF); + + ngx_conf_merge_str_value(conf->name, prev->name, "uid"); + ngx_conf_merge_str_value(conf->domain, prev->domain, "."); + ngx_conf_merge_str_value(conf->path, prev->path, "/"); + + ngx_conf_merge_sec_value(conf->expires, prev->expires, 0); + + return NGX_CONF_OK; +} + + +static ngx_int_t ngx_http_userid_init(ngx_cycle_t *cycle) +{ + ngx_http_next_header_filter = ngx_http_top_header_filter; + ngx_http_top_header_filter = ngx_http_userid_filter; + + return NGX_OK; +} |