details: https://hg.nginx.org/nginx/rev/cca4c8a715de
branches:
changeset: 8072:cca4c8a715de
user: Roman Arutyunyan <arut@nginx.com>
date: Wed Oct 12 16:58:16 2022 +0400
description:
PROXY protocol v2 TLV variables.

The variables have prefix $proxy_protocol_tlv_ and are accessible by name
and by type. Examples are: $proxy_protocol_tlv_0x01, $proxy_protocol_tlv_alpn.

diffstat:

src/core/ngx_proxy_protocol.c | 186 +++++++++++++++++++++++++++++++++++++-
src/core/ngx_proxy_protocol.h | 3 +
src/http/ngx_http_variables.c | 39 +++++++
src/stream/ngx_stream_variables.c | 39 +++++++
4 files changed, 265 insertions(+), 2 deletions(-)

diffs (365 lines):

diff -r 017fd847f4f7 -r cca4c8a715de src/core/ngx_proxy_protocol.c
--- a/src/core/ngx_proxy_protocol.c Mon Oct 10 13:57:31 2022 +0400
+++ b/src/core/ngx_proxy_protocol.c Wed Oct 12 16:58:16 2022 +0400
@@ -15,6 +15,12 @@

#define ngx_proxy_protocol_parse_uint16(p) ((p)[0] << 8 | (p)[1])

+#define ngx_proxy_protocol_parse_uint32(p) \
+ ( ((uint32_t) (p)[0] << 24) \
+ + ( (p)[1] << 16) \
+ + ( (p)[2] << 8) \
+ + ( (p)[3]) )
+

typedef struct {
u_char signature[12];
@@ -40,12 +46,52 @@ typedef struct {
} ngx_proxy_protocol_inet6_addrs_t;


+typedef struct {
+ u_char type;
+ u_char len[2];
+} ngx_proxy_protocol_tlv_t;
+
+
+typedef struct {
+ u_char client;
+ u_char verify[4];
+} ngx_proxy_protocol_tlv_ssl_t;
+
+
+typedef struct {
+ ngx_str_t name;
+ ngx_uint_t type;
+} ngx_proxy_protocol_tlv_entry_t;
+
+
static u_char *ngx_proxy_protocol_read_addr(ngx_connection_t *c, u_char *p,
u_char *last, ngx_str_t *addr);
static u_char *ngx_proxy_protocol_read_port(u_char *p, u_char *last,
in_port_t *port, u_char sep);
static u_char *ngx_proxy_protocol_v2_read(ngx_connection_t *c, u_char *buf,
u_char *last);
+static ngx_int_t ngx_proxy_protocol_lookup_tlv(ngx_connection_t *c,
+ ngx_str_t *tlvs, ngx_uint_t type, ngx_str_t *value);
+
+
+static ngx_proxy_protocol_tlv_entry_t ngx_proxy_protocol_tlv_entries[] = {
+ { ngx_string("alpn"), 0x01 },
+ { ngx_string("authority"), 0x02 },
+ { ngx_string("unique_id"), 0x05 },
+ { ngx_string("ssl"), 0x20 },
+ { ngx_string("netns"), 0x30 },
+ { ngx_null_string, 0x00 }
+};
+
+
+static ngx_proxy_protocol_tlv_entry_t ngx_proxy_protocol_tlv_ssl_entries[] = {
+ { ngx_string("version"), 0x21 },
+ { ngx_string("cn"), 0x22 },
+ { ngx_string("cipher"), 0x23 },
+ { ngx_string("sig_alg"), 0x24 },
+ { ngx_string("key_alg"), 0x25 },
+ { ngx_null_string, 0x00 }
+};


u_char *
@@ -418,11 +464,147 @@ ngx_proxy_protocol_v2_read(ngx_connectio
&pp->src_addr, pp->src_port, &pp->dst_addr, pp->dst_port);

if (buf < end) {
- ngx_log_debug1(NGX_LOG_DEBUG_CORE, c->log, 0,
- "PROXY protocol v2 %z bytes of tlv ignored", end - buf);
+ pp->tlvs.data = ngx_pnalloc(c->pool, end - buf);
+ if (pp->tlvs.data == NULL) {
+ return NULL;
+ }
+
+ ngx_memcpy(pp->tlvs.data, buf, end - buf);
+ pp->tlvs.len = end - buf;
}

c->proxy_protocol = pp;

return end;
}
+
+
+ngx_int_t
+ngx_proxy_protocol_get_tlv(ngx_connection_t *c, ngx_str_t *name,
+ ngx_str_t *value)
+{
+ u_char *p;
+ size_t n;
+ uint32_t verify;
+ ngx_str_t ssl, *tlvs;
+ ngx_int_t rc, type;
+ ngx_proxy_protocol_tlv_ssl_t *tlv_ssl;
+ ngx_proxy_protocol_tlv_entry_t *te;
+
+ if (c->proxy_protocol == NULL) {
+ return NGX_DECLINED;
+ }
+
+ ngx_log_debug1(NGX_LOG_DEBUG_CORE, c->log, 0,
+ "PROXY protocol v2 get tlv \"%V\"", name);
+
+ te = ngx_proxy_protocol_tlv_entries;
+ tlvs = &c->proxy_protocol->tlvs;
+
+ p = name->data;
+ n = name->len;
+
+ if (n >= 4 && p[0] == 's' && p[1] == 's' && p[2] == 'l' && p[3] == '_') {
+
+ rc = ngx_proxy_protocol_lookup_tlv(c, tlvs, 0x20, &ssl);
+ if (rc != NGX_OK) {
+ return rc;
+ }
+
+ if (ssl.len < sizeof(ngx_proxy_protocol_tlv_ssl_t)) {
+ return NGX_ERROR;
+ }
+
+ p += 4;
+ n -= 4;
+
+ if (n == 6 && ngx_strncmp(p, "verify", 6) == 0) {
+
+ tlv_ssl = (ngx_proxy_protocol_tlv_ssl_t *) ssl.data;
+ verify = ngx_proxy_protocol_parse_uint32(tlv_ssl->verify);
+
+ value->data = ngx_pnalloc(c->pool, NGX_INT32_LEN);
+ if (value->data == NULL) {
+ return NGX_ERROR;
+ }
+
+ value->len = ngx_sprintf(value->data, "%uD", verify)
+ - value->data;
+ return NGX_OK;
+ }
+
+ ssl.data += sizeof(ngx_proxy_protocol_tlv_ssl_t);
+ ssl.len -= sizeof(ngx_proxy_protocol_tlv_ssl_t);
+
+ te = ngx_proxy_protocol_tlv_ssl_entries;
+ tlvs = &ssl;
+ }
+
+ if (n >= 2 && p[0] == '0' && p[1] == 'x') {
+
+ type = ngx_hextoi(p + 2, n - 2);
+ if (type == NGX_ERROR) {
+ ngx_log_error(NGX_LOG_ERR, c->log, 0,
+ "invalid PROXY protocol TLV \"%V\"", name);
+ return NGX_ERROR;
+ }
+
+ return ngx_proxy_protocol_lookup_tlv(c, tlvs, type, value);
+ }
+
+ for ( /* void */ ; te->type; te++) {
+ if (te->name.len == n && ngx_strncmp(te->name.data, p, n) == 0) {
+ return ngx_proxy_protocol_lookup_tlv(c, tlvs, te->type, value);
+ }
+ }
+
+ ngx_log_error(NGX_LOG_ERR, c->log, 0,
+ "unknown PROXY protocol TLV \"%V\"", name);
+
+ return NGX_DECLINED;
+}
+
+
+static ngx_int_t
+ngx_proxy_protocol_lookup_tlv(ngx_connection_t *c, ngx_str_t *tlvs,
+ ngx_uint_t type, ngx_str_t *value)
+{
+ u_char *p;
+ size_t n, len;
+ ngx_proxy_protocol_tlv_t *tlv;
+
+ ngx_log_debug1(NGX_LOG_DEBUG_CORE, c->log, 0,
+ "PROXY protocol v2 lookup tlv:%02xi", type);
+
+ p = tlvs->data;
+ n = tlvs->len;
+
+ while (n) {
+ if (n < sizeof(ngx_proxy_protocol_tlv_t)) {
+ ngx_log_error(NGX_LOG_ERR, c->log, 0, "broken PROXY protocol TLV");
+ return NGX_ERROR;
+ }
+
+ tlv = (ngx_proxy_protocol_tlv_t *) p;
+ len = ngx_proxy_protocol_parse_uint16(tlv->len);
+
+ p += sizeof(ngx_proxy_protocol_tlv_t);
+ n -= sizeof(ngx_proxy_protocol_tlv_t);
+
+ if (n < len) {
+ ngx_log_error(NGX_LOG_ERR, c->log, 0, "broken PROXY protocol TLV");
+ return NGX_ERROR;
+ }
+
+ if (tlv->type == type) {
+ value->data = p;
+ value->len = len;
+ return NGX_OK;
+ }
+
+ p += len;
+ n -= len;
+ }
+
+ return NGX_DECLINED;
+}
diff -r 017fd847f4f7 -r cca4c8a715de src/core/ngx_proxy_protocol.h
--- a/src/core/ngx_proxy_protocol.h Mon Oct 10 13:57:31 2022 +0400
+++ b/src/core/ngx_proxy_protocol.h Wed Oct 12 16:58:16 2022 +0400
@@ -21,6 +21,7 @@ struct ngx_proxy_protocol_s {
ngx_str_t dst_addr;
in_port_t src_port;
in_port_t dst_port;
+ ngx_str_t tlvs;
};


@@ -28,6 +29,8 @@ u_char *ngx_proxy_protocol_read(ngx_conn
u_char *last);
u_char *ngx_proxy_protocol_write(ngx_connection_t *c, u_char *buf,
u_char *last);
+ngx_int_t ngx_proxy_protocol_get_tlv(ngx_connection_t *c, ngx_str_t *name,
+ ngx_str_t *value);


#endif /* _NGX_PROXY_PROTOCOL_H_INCLUDED_ */
diff -r 017fd847f4f7 -r cca4c8a715de src/http/ngx_http_variables.c
--- a/src/http/ngx_http_variables.c Mon Oct 10 13:57:31 2022 +0400
+++ b/src/http/ngx_http_variables.c Wed Oct 12 16:58:16 2022 +0400
@@ -61,6 +61,8 @@ static ngx_int_t ngx_http_variable_proxy
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_proxy_protocol_port(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
+static ngx_int_t ngx_http_variable_proxy_protocol_tlv(ngx_http_request_t *r,
+ ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_server_addr(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_server_port(ngx_http_request_t *r,
@@ -214,6 +216,10 @@ static ngx_http_variable_t ngx_http_cor
ngx_http_variable_proxy_protocol_port,
offsetof(ngx_proxy_protocol_t, dst_port), 0, 0 },

+ { ngx_string("proxy_protocol_tlv_"), NULL,
+ ngx_http_variable_proxy_protocol_tlv,
+ 0, NGX_HTTP_VAR_PREFIX, 0 },
+
{ ngx_string("server_addr"), NULL, ngx_http_variable_server_addr, 0, 0, 0 },

{ ngx_string("server_port"), NULL, ngx_http_variable_server_port, 0, 0, 0 },
@@ -1387,6 +1393,39 @@ ngx_http_variable_proxy_protocol_port(ng


static ngx_int_t
+ngx_http_variable_proxy_protocol_tlv(ngx_http_request_t *r,
+ ngx_http_variable_value_t *v, uintptr_t data)
+{
+ ngx_str_t *name = (ngx_str_t *) data;
+
+ ngx_int_t rc;
+ ngx_str_t tlv, value;
+
+ tlv.len = name->len - (sizeof("proxy_protocol_tlv_") - 1);
+ tlv.data = name->data + sizeof("proxy_protocol_tlv_") - 1;
+
+ rc = ngx_proxy_protocol_get_tlv(r->connection, &tlv, &value);
+
+ if (rc == NGX_ERROR) {
+ return NGX_ERROR;
+ }
+
+ if (rc == NGX_DECLINED) {
+ v->not_found = 1;
+ return NGX_OK;
+ }
+
+ v->len = value.len;
+ v->valid = 1;
+ v->no_cacheable = 0;
+ v->not_found = 0;
+ v->data = value.data;
+
+ return NGX_OK;
+}
+
+
+static ngx_int_t
ngx_http_variable_server_addr(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data)
{
diff -r 017fd847f4f7 -r cca4c8a715de src/stream/ngx_stream_variables.c
--- a/src/stream/ngx_stream_variables.c Mon Oct 10 13:57:31 2022 +0400
+++ b/src/stream/ngx_stream_variables.c Wed Oct 12 16:58:16 2022 +0400
@@ -23,6 +23,8 @@ static ngx_int_t ngx_stream_variable_pro
ngx_stream_session_t *s, ngx_stream_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_stream_variable_proxy_protocol_port(
ngx_stream_session_t *s, ngx_stream_variable_value_t *v, uintptr_t data);
+static ngx_int_t ngx_stream_variable_proxy_protocol_tlv(
+ ngx_stream_session_t *s, ngx_stream_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_stream_variable_server_addr(ngx_stream_session_t *s,
ngx_stream_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_stream_variable_server_port(ngx_stream_session_t *s,
@@ -79,6 +81,10 @@ static ngx_stream_variable_t ngx_stream
ngx_stream_variable_proxy_protocol_port,
offsetof(ngx_proxy_protocol_t, dst_port), 0, 0 },

+ { ngx_string("proxy_protocol_tlv_"), NULL,
+ ngx_stream_variable_proxy_protocol_tlv,
+ 0, NGX_STREAM_VAR_PREFIX, 0 },
+
{ ngx_string("server_addr"), NULL,
ngx_stream_variable_server_addr, 0, 0, 0 },

@@ -622,6 +628,39 @@ ngx_stream_variable_proxy_protocol_port(


static ngx_int_t
+ngx_stream_variable_proxy_protocol_tlv(ngx_stream_session_t *s,
+ ngx_stream_variable_value_t *v, uintptr_t data)
+{
+ ngx_str_t *name = (ngx_str_t *) data;
+
+ ngx_int_t rc;
+ ngx_str_t tlv, value;
+
+ tlv.len = name->len - (sizeof("proxy_protocol_tlv_") - 1);
+ tlv.data = name->data + sizeof("proxy_protocol_tlv_") - 1;
+
+ rc = ngx_proxy_protocol_get_tlv(s->connection, &tlv, &value);
+
+ if (rc == NGX_ERROR) {
+ return NGX_ERROR;
+ }
+
+ if (rc == NGX_DECLINED) {
+ v->not_found = 1;
+ return NGX_OK;
+ }
+
+ v->len = value.len;
+ v->valid = 1;
+ v->no_cacheable = 0;
+ v->not_found = 0;
+ v->data = value.data;
+
+ return NGX_OK;
+}
+
+
+static ngx_int_t
ngx_stream_variable_server_addr(ngx_stream_session_t *s,
ngx_stream_variable_value_t *v, uintptr_t data)
{
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