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Developer's Guide to Oracle Solaris 10 Security Oracle Solaris 10 1/13 Information Library |
1. Oracle Solaris Security for Developers (Overview)
2. Developing Privileged Applications
3. Writing PAM Applications and Services
4. Writing Applications That Use GSS-API
GSSAPI Client Example Overview
GSSAPI Client Example Structure
Running the GSSAPI Client Example
GSSAPI Client Example: main() Function
Opening a Connection With the Server
Establishing a Security Context With the Server
Translating a Service Name into GSS-API Format
Establishing a Security Context for GSS-API
Miscellaneous GSSAPI Context Operations on the Client Side
Reading and Verifying a Signature Block From a GSS-API Client
7. Writing Applications That Use SASL
8. Introduction to the Oracle Solaris Cryptographic Framework
9. Writing User-Level Cryptographic Applications and Providers
10. Using the Smart Card Framework
A. Sample C-Based GSS-API Programs
D. Source Code for SASL Example
The gss-client application needs to wrap, that is, encrypt the data before the data can be sent. The application goes through the following steps to wrap the message:
Determines the wrap size limit. This process ensures that the wrapped message can be accommodated by the protocol.
Obtains the source and destination names. Translates the names from object identifiers to strings.
Gets the list of mechanism names. Translates the names from object identifiers to strings.
Inserts the message into a buffer and wraps the message.
Sends the message to the server.
The following source code wraps a message.
Example 5-6 gss-client Example: call_server() – Wrap Message
/* Test gss_wrap_size_limit */ maj_stat = gss_wrap_size_limit(&min_stat, context, conf_req_flag, GSS_C_QOP_DEFAULT, req_output_size, &max_input_size); if (maj_stat != GSS_S_COMPLETE) { display_status("wrap_size_limit call", maj_stat, min_stat); } else fprintf (stderr, "gss_wrap_size_limit returned " "max input size = %d \n" "for req_output_size = %d with Integrity only\n", max_input_size , req_output_size , conf_req_flag); conf_req_flag = 1; maj_stat = gss_wrap_size_limit(&min_stat, context, conf_req_flag, GSS_C_QOP_DEFAULT, req_output_size, &max_input_size); if (maj_stat != GSS_S_COMPLETE) { display_status("wrap_size_limit call", maj_stat, min_stat); } else fprintf (stderr, "gss_wrap_size_limit returned " " max input size = %d \n" "for req_output_size = %d with " "Integrity & Privacy \n", max_input_size , req_output_size ); maj_stat = gss_display_name(&min_stat, src_name, &sname, &name_type); if (maj_stat != GSS_S_COMPLETE) { display_status("displaying source name", maj_stat, min_stat); return -1; } maj_stat = gss_display_name(&min_stat, targ_name, &tname, (gss_OID *) NULL); if (maj_stat != GSS_S_COMPLETE) { display_status("displaying target name", maj_stat, min_stat); return -1; } fprintf(stderr, "\"%.*s\" to \"%.*s\", lifetime %u, flags %x, %s, %s\n", (int) sname.length, (char *) sname.value, (int) tname.length, (char *) tname.value, lifetime, context_flags, (is_local) ? "locally initiated" : "remotely initiated", (is_open) ? "open" : "closed"); (void) gss_release_name(&min_stat, &src_name); (void) gss_release_name(&min_stat, &targ_name); (void) gss_release_buffer(&min_stat, &sname); (void) gss_release_buffer(&min_stat, &tname); maj_stat = gss_oid_to_str(&min_stat, name_type, &oid_name); if (maj_stat != GSS_S_COMPLETE) { display_status("converting oid->string", maj_stat, min_stat); return -1; } fprintf(stderr, "Name type of source name is %.*s.\n", (int) oid_name.length, (char *) oid_name.value); (void) gss_release_buffer(&min_stat, &oid_name); /* Now get the names supported by the mechanism */ maj_stat = gss_inquire_names_for_mech(&min_stat, mechanism, &mech_names); if (maj_stat != GSS_S_COMPLETE) { display_status("inquiring mech names", maj_stat, min_stat); return -1; } maj_stat = gss_oid_to_str(&min_stat, mechanism, &oid_name); if (maj_stat != GSS_S_COMPLETE) { display_status("converting oid->string", maj_stat, min_stat); return -1; } mechStr = (char *)__gss_oid_to_mech(mechanism); fprintf(stderr, "Mechanism %.*s (%s) supports %d names\n", (int) oid_name.length, (char *) oid_name.value, (mechStr == NULL ? "NULL" : mechStr), mech_names->count); (void) gss_release_buffer(&min_stat, &oid_name); for (i=0; i < mech_names->count; i++) { maj_stat = gss_oid_to_str(&min_stat, &mech_names->elements[i], &oid_name); if (maj_stat != GSS_S_COMPLETE) { display_status("converting oid->string", maj_stat, min_stat); return -1; } fprintf(stderr, " %d: %.*s\n", i, (int) oid_name.length, ( char *) oid_name.value); (void) gss_release_buffer(&min_stat, &oid_name); } (void) gss_release_oid_set(&min_stat, &mech_names); if (use_file) { read_file(msg, &in_buf); } else { /* Wrap the message */ in_buf.value = msg; in_buf.length = strlen(msg) + 1; } if (ret_flag & GSS_C_CONF_FLAG) { state = 1; else state = 0; } maj_stat = gss_wrap(&min_stat, context, 1, GSS_C_QOP_DEFAULT, &in_buf, &state, &out_buf); if (maj_stat != GSS_S_COMPLETE) { display_status("wrapping message", maj_stat, min_stat); (void) close(s); (void) gss_delete_sec_context(&min_stat, &context, GSS_C_NO_BUFFER); return -1; } else if (! state) { fprintf(stderr, "Warning! Message not encrypted.\n"); } /* Send to server */ if (send_token(s, &out_buf) < 0) { (void) close(s); (void) gss_delete_sec_context(&min_stat, &context, GSS_C_NO_BUFFER); return -1; } (void) gss_release_buffer(&min_stat, &out_buf);