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path: root/src/http/modules/ngx_http_userid_filter.c
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Diffstat (limited to 'src/http/modules/ngx_http_userid_filter.c')
-rw-r--r--src/http/modules/ngx_http_userid_filter.c506
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;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-25 15:58:35 +0300