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From b2b7729d71e7ab2cde9c73b40b8e972c82a875a2 Mon Sep 17 00:00:00 2001
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From: Sumit Bose <sbose@redhat.com>
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Date: Mon, 8 Nov 2021 17:48:50 +0100
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Subject: [PATCH] Support larger RADIUS attributes in libkrad
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In kr_attrset_decode(), explicitly treat the length byte as unsigned.
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Otherwise attributes longer than 125 characters will be rejected with
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EBADMSG.
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Add a 253-character-long NAS-Identifier attribute to the tests to make
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sure that attributes with the maximal number of characters are working
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as expected.
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[ghudson@mit.edu: used uint8_t cast per current practices; edited
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commit message]
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ticket: 9036 (new)
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---
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src/lib/krad/attrset.c | 2 +-
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src/lib/krad/t_packet.c | 13 +++++++++++++
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2 files changed, 14 insertions(+), 1 deletion(-)
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diff --git a/src/lib/krad/attrset.c b/src/lib/krad/attrset.c
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index d89982a13..6ec031e32 100644
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--- a/src/lib/krad/attrset.c
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+++ b/src/lib/krad/attrset.c
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@@ -218,7 +218,7 @@ kr_attrset_decode(krb5_context ctx, const krb5_data *in, const char *secret,
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for (i = 0; i + 2 < in->length; ) {
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type = in->data[i++];
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- tmp = make_data(&in->data[i + 1], in->data[i] - 2);
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+ tmp = make_data(&in->data[i + 1], (uint8_t)in->data[i] - 2);
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i += tmp.length + 1;
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retval = (in->length < i) ? EBADMSG : 0;
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diff --git a/src/lib/krad/t_packet.c b/src/lib/krad/t_packet.c
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index 0a92e9cc2..c22489144 100644
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--- a/src/lib/krad/t_packet.c
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+++ b/src/lib/krad/t_packet.c
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@@ -57,6 +57,14 @@ make_packet(krb5_context ctx, const krb5_data *username,
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krb5_error_code retval;
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const krb5_data *data;
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int i = 0;
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+ krb5_data nas_id;
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+
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+ nas_id = string2data("12345678901234567890123456789012345678901234567890"
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+ "12345678901234567890123456789012345678901234567890"
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+ "12345678901234567890123456789012345678901234567890"
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+ "12345678901234567890123456789012345678901234567890"
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+ "12345678901234567890123456789012345678901234567890"
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+ "123");
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retval = krad_attrset_new(ctx, &set);
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if (retval != 0)
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@@ -71,6 +79,11 @@ make_packet(krb5_context ctx, const krb5_data *username,
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if (retval != 0)
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goto out;
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+ retval = krad_attrset_add(set, krad_attr_name2num("NAS-Identifier"),
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+ &nas_id);
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+ if (retval != 0)
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+ goto out;
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+
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retval = krad_packet_new_request(ctx, "foo",
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krad_code_name2num("Access-Request"),
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set, iterator, &i, &tmp);
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--
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2.35.3
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