[PATCH v2 4/6] net: lwip: Enable https:// support for wget
Jerome Forissier
jerome.forissier at linaro.org
Wed Nov 6 14:50:28 CET 2024
Hi Ilias,
On 10/24/24 12:24, Ilias Apalodimas wrote:
> With the recent changes of lwip & mbedTLS we can now download from
> https:// urls instead of just http://.
> Adjust our wget lwip version parsing to support both URLs.
> While at it adjust the default TCP window for QEMU since https seems to
> require at least 16384
>
> Signed-off-by: Ilias Apalodimas <ilias.apalodimas at linaro.org>
> ---
> cmd/Kconfig | 19 ++++++++++++
> net/lwip/Kconfig | 2 +-
> net/lwip/wget.c | 78 +++++++++++++++++++++++++++++++++++++++++++-----
> 3 files changed, 91 insertions(+), 8 deletions(-)
>
> diff --git a/cmd/Kconfig b/cmd/Kconfig
> index 3ee70f31b142..1d90a884e2c1 100644
> --- a/cmd/Kconfig
> +++ b/cmd/Kconfig
> @@ -2126,6 +2126,25 @@ config CMD_WGET
> wget is a simple command to download kernel, or other files,
> from a http server over TCP.
>
> +config WGET_HTTPS
> + bool "wget https"
> + depends on CMD_WGET
> + depends on PROT_TCP_LWIP
> + depends on MBEDTLS_LIB
> + select SHA256
> + select RSA
> + select ASYMMETRIC_KEY_TYPE
> + select ASYMMETRIC_PUBLIC_KEY_SUBTYPE
> + select X509_CERTIFICATE_PARSER
> + select PKCS7_MESSAGE_PARSER
> + select MBEDTLS_LIB_CRYPTO
> + select MBEDTLS_LIB_TLS
> + select RSA_VERIFY_WITH_PKEY
> + select X509_CERTIFICATE_PARSER
> + select PKCS7_MESSAGE_PARSER
> + help
> + Enable TLS over http for wget.
s/http/HTTP/
Maybe add "This adds support for https:// URLs"?
> +
> endif # if CMD_NET
>
> config CMD_PXE
> diff --git a/net/lwip/Kconfig b/net/lwip/Kconfig
> index 8a67de4cf335..a9ae9bf7fa2a 100644
> --- a/net/lwip/Kconfig
> +++ b/net/lwip/Kconfig
> @@ -37,7 +37,7 @@ config PROT_UDP_LWIP
>
> config LWIP_TCP_WND
> int "Value of TCP_WND"
> - default 8000 if ARCH_QEMU
> + default 32768 if ARCH_QEMU
> default 3000000
> help
> Default value for TCP_WND in the lwIP configuration
> diff --git a/net/lwip/wget.c b/net/lwip/wget.c
> index b495ebd1aa96..1a2ecdcddf34 100644
> --- a/net/lwip/wget.c
> +++ b/net/lwip/wget.c
> @@ -7,13 +7,17 @@
> #include <efi_loader.h>
> #include <image.h>
> #include <lwip/apps/http_client.h>
> +#include "lwip/altcp_tls.h"
> #include <lwip/timeouts.h>
> +#include <rng.h>
> #include <mapmem.h>
> #include <net.h>
> #include <time.h>
> +#include <dm/uclass.h>
>
> #define SERVER_NAME_SIZE 200
> #define HTTP_PORT_DEFAULT 80
> +#define HTTPS_PORT_DEFAULT 443
> #define PROGRESS_PRINT_STEP_BYTES (100 * 1024)
>
> enum done_state {
> @@ -32,18 +36,53 @@ struct wget_ctx {
> enum done_state done;
> };
>
> +bool wget_validate_uri(char *uri);
> +
> +int mbedtls_hardware_poll(void *data, unsigned char *output, size_t len,
> + size_t *olen)
> +{
> + struct udevice *dev;
> + u64 rng = 0;
> + int ret;
> +
> + *olen = 0;
> +
> + ret = uclass_get_device(UCLASS_RNG, 0, &dev);
> + if (ret) {
> + log_err("Failed to get an rng: %d\n", ret);
> + return ret;
> + }
> + ret = dm_rng_read(dev, &rng, sizeof(rng));
> + if (ret)
> + return ret;
> +
> + memcpy(output, &rng, len);
> + *olen = sizeof(rng);
> +
> + return 0;
> +}
> +
> static int parse_url(char *url, char *host, u16 *port, char **path)
> {
> char *p, *pp;
> long lport;
> + size_t prefix_len = 0;
> +
> + if (!wget_validate_uri(url)) {
> + log_err("Invalid URL. Use http(s)://\n");
> + return -EINVAL;
> + }
>
> + *port = HTTP_PORT_DEFAULT;
> + prefix_len = strlen("http://");
> p = strstr(url, "http://");
> if (!p) {
> - log_err("only http:// is supported\n");
> - return -EINVAL;
> + p = strstr(url, "https://");
> + prefix_len = strlen("https://");
> + *port = HTTPS_PORT_DEFAULT;
> }
>
> - p += strlen("http://");
> + p += prefix_len;
>
> /* Parse hostname */
> pp = strchr(p, ':');
> @@ -67,9 +106,8 @@ static int parse_url(char *url, char *host, u16 *port, char **path)
> if (lport > 65535)
> return -EINVAL;
> *port = (u16)lport;
> - } else {
> - *port = HTTP_PORT_DEFAULT;
> }
> +
> if (*pp != '/')
> return -EINVAL;
> *path = pp;
> @@ -210,6 +248,9 @@ static void httpc_result_cb(void *arg, httpc_result_t httpc_result,
> static int wget_loop(struct udevice *udev, ulong dst_addr, char *uri)
> {
> char server_name[SERVER_NAME_SIZE];
> +#if defined CONFIG_WGET_HTTPS
> + altcp_allocator_t tls_allocator;
> +#endif
> httpc_connection_t conn;
> httpc_state_t *state;
> struct netif *netif;
> @@ -232,6 +273,22 @@ static int wget_loop(struct udevice *udev, ulong dst_addr, char *uri)
> return -1;
>
> memset(&conn, 0, sizeof(conn));
> +#if defined CONFIG_WGET_HTTPS
> + if (port == HTTPS_PORT_DEFAULT) {
Does this mean the port has to be 443 for HTTPS to be used? Or that
plain HTTP is not possible over port 443? That would be overly restrictive
IMO.
> + tls_allocator.alloc = &altcp_tls_alloc;
> + tls_allocator.arg =
> + altcp_tls_create_config_client(NULL, 0, server_name);
> +
> + if (!tls_allocator.arg) {
> + log_err("error: Cannot create a TLS connection\n");
> + net_lwip_remove_netif(netif);
> + return -1;
> + }
> +
> + conn.altcp_allocator = &tls_allocator;
> + }
> +#endif
> +
> conn.result_fn = httpc_result_cb;
> ctx.path = path;
> if (httpc_get_file_dns(server_name, port, path, &conn, httpc_recv_cb,
> @@ -316,6 +373,7 @@ bool wget_validate_uri(char *uri)
> char c;
> bool ret = true;
> char *str_copy, *s, *authority;
> + size_t prefix_len = 0;
>
> for (c = 0x1; c < 0x21; c++) {
> if (strchr(uri, c)) {
> @@ -323,15 +381,21 @@ bool wget_validate_uri(char *uri)
> return false;
> }
> }
> +
> if (strchr(uri, 0x7f)) {
> log_err("invalid character is used\n");
> return false;
> }
>
> - if (strncmp(uri, "http://", 7)) {
> - log_err("only http:// is supported\n");
> + if (!strncmp(uri, "http://", strlen("http://"))) {
> + prefix_len = strlen("http://");
> + } else if (!strncmp(uri, "https://", strlen("https://"))) {
> + prefix_len = strlen("https://");
> + } else {
> + log_err("only http(s):// is supported\n");
> return false;
> }
> +
> str_copy = strdup(uri);
> if (!str_copy)
> return false;
Thanks,
--
Jerome
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