X-Git-Url: http://andersk.mit.edu/gitweb/openssh.git/blobdiff_plain/7364bd04fc18484f99f74b901c4581795bcf2787..9b4b86c2134a67e76ed043f67481cd5da84511a8:/gss-serv.c diff --git a/gss-serv.c b/gss-serv.c index 42718177..2ec7ea19 100644 --- a/gss-serv.c +++ b/gss-serv.c @@ -1,4 +1,4 @@ -/* $OpenBSD: gss-serv.c,v 1.1 2003/08/22 10:56:09 markus Exp $ */ +/* $OpenBSD: gss-serv.c,v 1.22 2008/05/08 12:02:23 djm Exp $ */ /* * Copyright (c) 2001-2003 Simon Wilkinson. All rights reserved. @@ -28,21 +28,26 @@ #ifdef GSSAPI -#include "bufaux.h" -#include "compat.h" +#include +#include + +#include +#include +#include + +#include "openbsd-compat/sys-queue.h" +#include "xmalloc.h" +#include "buffer.h" +#include "key.h" +#include "hostfile.h" #include "auth.h" #include "log.h" #include "channels.h" #include "session.h" -#include "servconf.h" -#include "monitor_wrap.h" -#include "xmalloc.h" -#include "getput.h" +#include "misc.h" #include "ssh-gss.h" -extern ServerOptions options; - static ssh_gssapi_client gssapi_client = { GSS_C_EMPTY_BUFFER, GSS_C_EMPTY_BUFFER, GSS_C_NO_CREDENTIAL, NULL, {NULL, NULL, NULL}}; @@ -61,7 +66,54 @@ ssh_gssapi_mech* supported_mechs[]= { &gssapi_null_mech, }; -/* Unpriviledged */ + +/* + * Acquire credentials for a server running on the current host. + * Requires that the context structure contains a valid OID + */ + +/* Returns a GSSAPI error code */ +/* Privileged (called from ssh_gssapi_server_ctx) */ +static OM_uint32 +ssh_gssapi_acquire_cred(Gssctxt *ctx) +{ + OM_uint32 status; + char lname[MAXHOSTNAMELEN]; + gss_OID_set oidset; + + gss_create_empty_oid_set(&status, &oidset); + gss_add_oid_set_member(&status, ctx->oid, &oidset); + + if (gethostname(lname, MAXHOSTNAMELEN)) { + gss_release_oid_set(&status, &oidset); + return (-1); + } + + if (GSS_ERROR(ssh_gssapi_import_name(ctx, lname))) { + gss_release_oid_set(&status, &oidset); + return (ctx->major); + } + + if ((ctx->major = gss_acquire_cred(&ctx->minor, + ctx->name, 0, oidset, GSS_C_ACCEPT, &ctx->creds, NULL, NULL))) + ssh_gssapi_error(ctx); + + gss_release_oid_set(&status, &oidset); + return (ctx->major); +} + +/* Privileged */ +OM_uint32 +ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID oid) +{ + if (*ctx) + ssh_gssapi_delete_ctx(ctx); + ssh_gssapi_build_ctx(ctx); + ssh_gssapi_set_oid(*ctx, oid); + return (ssh_gssapi_acquire_cred(*ctx)); +} + +/* Unprivileged */ void ssh_gssapi_supported_oids(gss_OID_set *oidset) { @@ -82,6 +134,8 @@ ssh_gssapi_supported_oids(gss_OID_set *oidset) &supported_mechs[i]->oid, oidset); i++; } + + gss_release_oid_set(&min_status, &supported); } @@ -90,7 +144,7 @@ ssh_gssapi_supported_oids(gss_OID_set *oidset) * oid * credentials (from ssh_gssapi_acquire_cred) */ -/* Priviledged */ +/* Privileged */ OM_uint32 ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *recv_tok, gss_buffer_desc *send_tok, OM_uint32 *flags) @@ -134,18 +188,18 @@ ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *recv_tok, static OM_uint32 ssh_gssapi_parse_ename(Gssctxt *ctx, gss_buffer_t ename, gss_buffer_t name) { - char *tok; + u_char *tok; OM_uint32 offset; OM_uint32 oidl; - - tok=ename->value; - - /* - * Check that ename is long enough for all of the fixed length + + tok = ename->value; + + /* + * Check that ename is long enough for all of the fixed length * header, and that the initial ID bytes are correct */ - if (ename->length<6 || memcmp(tok,"\x04\x01", 2)!=0) + if (ename->length < 6 || memcmp(tok, "\x04\x01", 2) != 0) return GSS_S_FAILURE; /* @@ -155,7 +209,7 @@ ssh_gssapi_parse_ename(Gssctxt *ctx, gss_buffer_t ename, gss_buffer_t name) * second without. */ - oidl = GET_16BIT(tok+2); /* length including next two bytes */ + oidl = get_u16(tok+2); /* length including next two bytes */ oidl = oidl-2; /* turn it into the _real_ length of the variable OID */ /* @@ -163,38 +217,39 @@ ssh_gssapi_parse_ename(Gssctxt *ctx, gss_buffer_t ename, gss_buffer_t name) * string is long enough and that the OID matches that in our context */ if (tok[4] != 0x06 || tok[5] != oidl || - ename->length < oidl+6 || - !ssh_gssapi_check_oid(ctx,tok+6,oidl)) + ename->length < oidl+6 || + !ssh_gssapi_check_oid(ctx, tok+6, oidl)) return GSS_S_FAILURE; offset = oidl+6; - + if (ename->length < offset+4) return GSS_S_FAILURE; - - name->length = GET_32BIT(tok+offset); + + name->length = get_u32(tok+offset); offset += 4; - + if (ename->length < offset+name->length) - return GSS_S_FAILURE; - - name->value = xmalloc(name->length); - memcpy(name->value,tok+offset,name->length); - + return GSS_S_FAILURE; + + name->value = xmalloc(name->length+1); + memcpy(name->value, tok+offset, name->length); + ((char *)name->value)[name->length] = 0; + return GSS_S_COMPLETE; -} +} /* Extract the client details from a given context. This can only reliably * be called once for a context */ -/* Priviledged (called from accept_secure_ctx) */ +/* Privileged (called from accept_secure_ctx) */ OM_uint32 ssh_gssapi_getclient(Gssctxt *ctx, ssh_gssapi_client *client) { int i = 0; gss_buffer_desc ename; - + client->mech = NULL; while (supported_mechs[i]->name != NULL) { @@ -205,21 +260,21 @@ ssh_gssapi_getclient(Gssctxt *ctx, ssh_gssapi_client *client) i++; } - if (client->mech == NULL) + if (client->mech == NULL) return GSS_S_FAILURE; - - if ((ctx->major = gss_display_name(&ctx->minor, ctx->client, + + if ((ctx->major = gss_display_name(&ctx->minor, ctx->client, &client->displayname, NULL))) { - ssh_gssapi_error(ctx); - return (ctx->major); + ssh_gssapi_error(ctx); + return (ctx->major); } - - if ((ctx->major = gss_export_name(&ctx->minor, ctx->client, + + if ((ctx->major = gss_export_name(&ctx->minor, ctx->client, &ename))) { ssh_gssapi_error(ctx); return (ctx->major); } - + if ((ctx->major = ssh_gssapi_parse_ename(ctx,&ename, &client->exportedname))) { return (ctx->major); @@ -231,13 +286,14 @@ ssh_gssapi_getclient(Gssctxt *ctx, ssh_gssapi_client *client) return (ctx->major); } -/* As user - called through fatal cleanup hook */ +/* As user - called on fatal/exit */ void -ssh_gssapi_cleanup_creds(void *ignored) +ssh_gssapi_cleanup_creds(void) { if (gssapi_client.store.filename != NULL) { /* Unlink probably isn't sufficient */ - debug("removing gssapi cred file\"%s\"", gssapi_client.store.filename); + debug("removing gssapi cred file\"%s\"", + gssapi_client.store.filename); unlink(gssapi_client.store.filename); } } @@ -248,8 +304,6 @@ ssh_gssapi_storecreds(void) { if (gssapi_client.mech && gssapi_client.mech->storecreds) { (*gssapi_client.mech->storecreds)(&gssapi_client); - if (options.gss_cleanup_creds) - fatal_add_cleanup(ssh_gssapi_cleanup_creds, NULL); } else debug("ssh_gssapi_storecreds: Not a GSSAPI mechanism"); } @@ -264,28 +318,48 @@ ssh_gssapi_do_child(char ***envp, u_int *envsizep) if (gssapi_client.store.envvar != NULL && gssapi_client.store.envval != NULL) { - debug("Setting %s to %s", gssapi_client.store.envvar, - gssapi_client.store.envval); + gssapi_client.store.envval); child_set_env(envp, envsizep, gssapi_client.store.envvar, - gssapi_client.store.envval); + gssapi_client.store.envval); } } -/* Priviledged */ +/* Privileged */ int ssh_gssapi_userok(char *user) { + OM_uint32 lmin; + if (gssapi_client.exportedname.length == 0 || gssapi_client.exportedname.value == NULL) { debug("No suitable client data"); return 0; } if (gssapi_client.mech && gssapi_client.mech->userok) - return ((*gssapi_client.mech->userok)(&gssapi_client, user)); + if ((*gssapi_client.mech->userok)(&gssapi_client, user)) + return 1; + else { + /* Destroy delegated credentials if userok fails */ + gss_release_buffer(&lmin, &gssapi_client.displayname); + gss_release_buffer(&lmin, &gssapi_client.exportedname); + gss_release_cred(&lmin, &gssapi_client.creds); + memset(&gssapi_client, 0, sizeof(ssh_gssapi_client)); + return 0; + } else debug("ssh_gssapi_userok: Unknown GSSAPI mechanism"); return (0); } +/* Privileged */ +OM_uint32 +ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic) +{ + ctx->major = gss_verify_mic(&ctx->minor, ctx->context, + gssbuf, gssmic, NULL); + + return (ctx->major); +} + #endif