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MINOR: acme: emit a log for DNS-01 challenge response

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This commit emits a log which output the TXT entry to create in case of
DNS-01. This is useful in cases you want to update your TXT entry
manually.

Example:

    acme: foobar.pem.rsa: DNS-01 requires to set the "acme-challenge.example.com" TXT record to "7L050ytWm6ityJqolX-PzBPR0LndHV8bkZx3Zsb-FMg"
This commit is contained in:
William Lallemand 2025-08-01 16:04:12 +02:00
parent 09275fd549
commit 365a69648c
2 changed files with 63 additions and 0 deletions
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1
include/haproxy/acme-t.h
View File

@ -51,6 +51,7 @@ enum http_st {
};
struct acme_auth {
struct ist dns; /* dns entry */
struct ist auth; /* auth URI */
struct ist chall; /* challenge URI */
struct ist token; /* token */

62
src/acme.c
View File

@ -755,6 +755,7 @@ static void acme_ctx_destroy(struct acme_ctx *ctx)
istfree(&auth->auth);
istfree(&auth->chall);
istfree(&auth->token);
istfree(&auth->token);
next = auth->next;
free(auth);
auth = next;
@ -890,6 +891,42 @@ int acme_http_req(struct task *task, struct acme_ctx *ctx, struct ist url, enum
}
/*
* compute a TXT record for DNS-01 challenge
* base64url(sha256(token || '.' || base64url(Thumbprint(accountKey))))
*
* https://datatracker.ietf.org/doc/html/rfc8555/#section-8.4
*
*/
int acme_txt_record(const struct ist thumbprint, const struct ist token, struct buffer *output)
{
unsigned char md[EVP_MAX_MD_SIZE];
struct buffer *tmp = NULL;
unsigned int size;
int ret = 0;
if ((tmp = alloc_trash_chunk()) == NULL)
goto out;
chunk_istcat(tmp, token);
chunk_appendf(tmp, ".");
chunk_istcat(tmp, thumbprint);
if (EVP_Digest(tmp->area, tmp->data, md, &size, EVP_sha256(), NULL) == 0)
goto out;
ret = a2base64url((const char *)md, size, output->area, output->size);
output->data = ret;
out:
free_trash_chunk(tmp);
return ret;
}
int acme_jws_payload(struct buffer *req, struct ist nonce, struct ist url, EVP_PKEY *pkey, struct ist kid, struct buffer *output, char **errmsg)
{
struct buffer *b64payload = NULL;
@ -1475,6 +1512,23 @@ int acme_res_auth(struct task *task, struct acme_ctx *ctx, struct acme_auth *aut
goto error;
}
/* check and save the DNS entry */
ret = mjson_get_string(hc->res.buf.area, hc->res.buf.data, "$.identifier.type", t1->area, t1->size);
if (ret == -1) {
memprintf(errmsg, "couldn't get a type \"dns\" from Authorization URL \"%s\"", auth->auth.ptr);
goto error;
}
t1->data = ret;
ret = mjson_get_string(hc->res.buf.area, hc->res.buf.data, "$.identifier.value", t2->area, t2->size);
if (ret == -1) {
memprintf(errmsg, "couldn't get a type \"dns\" from Authorization URL \"%s\"", auth->auth.ptr);
goto error;
}
t2->data = ret;
auth->dns = istdup(ist2(t2->area, t2->data));
/* get the multiple challenges and select the one from the configuration */
for (i = 0; ; i++) {
int ret;
@ -1524,6 +1578,14 @@ int acme_res_auth(struct task *task, struct acme_ctx *ctx, struct acme_auth *aut
goto error;
}
/* compute a response for the TXT entry */
if (strcasecmp(ctx->cfg->challenge, "DNS-01") == 0) {
trash.data = acme_txt_record(ist(ctx->cfg->account.thumbprint), auth->token, &trash);
send_log(NULL, LOG_NOTICE,"acme: %s: DNS-01 requires to set the \"acme-challenge.%.*s\" TXT record to \"%.*s\"\n",
ctx->store->path, (int)auth->dns.len, auth->dns.ptr, (int)trash.data, trash.area);
}
/* only useful for HTTP-01 */
if (acme_add_challenge_map(ctx->cfg->map, auth->token.ptr, ctx->cfg->account.thumbprint, errmsg) != 0) {
memprintf(errmsg, "couldn't add the token to the '%s' map: %s", ctx->cfg->map, *errmsg);
goto error;