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http_negotiate: Use dynamic buffer for SPN generation

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Use a dynamicly allocated buffer for the temporary SPN variable similar
to how the SASL GSS-API code does, rather than using a fixed buffer of
2048 characters.
This commit is contained in:
Steve Holme 2015-01-18 17:36:59 +00:00
parent 9c4fa400cf
commit 1cbc8fd3d1
1 changed files with 26 additions and 27 deletions

53
lib/http_negotiate.c

@ -31,6 +31,7 @@
#include "curl_base64.h"
#include "http_negotiate.h"
#include "curl_memory.h"
#include "curl_sasl.h"
#include "url.h"
#define _MPRINTF_REPLACE /* use our functions only */
@ -39,31 +40,6 @@
/* The last #include file should be: */
#include "memdebug.h"
static int
get_gss_name(struct connectdata *conn, bool proxy, gss_name_t *server)
{
OM_uint32 major_status, minor_status;
gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
char name[2048];
const char* service = "HTTP";
token.length = strlen(service) + 1 + strlen(proxy ? conn->proxy.name :
conn->host.name) + 1;
if(token.length + 1 > sizeof(name))
return EMSGSIZE;
snprintf(name, sizeof(name), "%s@%s", service, proxy ? conn->proxy.name :
conn->host.name);
token.value = (void *) name;
major_status = gss_import_name(&minor_status,
&token,
GSS_C_NT_HOSTBASED_SERVICE,
server);
return GSS_ERROR(major_status) ? -1 : 0;
}
CURLcode Curl_input_negotiate(struct connectdata *conn, bool proxy,
const char *header)
{
@ -71,6 +47,7 @@ CURLcode Curl_input_negotiate(struct connectdata *conn, bool proxy,
struct negotiatedata *neg_ctx = proxy?&data->state.proxyneg:
&data->state.negotiate;
OM_uint32 major_status, minor_status, discard_st;
gss_buffer_desc spn_token = GSS_C_EMPTY_BUFFER;
gss_buffer_desc input_token = GSS_C_EMPTY_BUFFER;
gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
size_t len;
@ -85,10 +62,32 @@ CURLcode Curl_input_negotiate(struct connectdata *conn, bool proxy,
return CURLE_LOGIN_DENIED;
}
if(neg_ctx->server_name == NULL &&
get_gss_name(conn, proxy, &neg_ctx->server_name))
if(!neg_ctx->server_name) {
/* Generate our SPN */
char *spn = Curl_sasl_build_gssapi_spn("HTTP", proxy ? conn->proxy.name :
conn->host.name);
if(!spn)
return CURLE_OUT_OF_MEMORY;
/* Populate the SPN structure */
spn_token.value = spn;
spn_token.length = strlen(spn);
/* Import the SPN */
major_status = gss_import_name(&minor_status, &spn_token,
GSS_C_NT_HOSTBASED_SERVICE,
&neg_ctx->server_name);
if(GSS_ERROR(major_status)) {
Curl_gss_log_error(data, minor_status, "gss_import_name() failed: ");
Curl_safefree(spn);
return CURLE_OUT_OF_MEMORY;
}
Curl_safefree(spn);
}
header += strlen("Negotiate");
while(*header && ISSPACE(*header))
header++;