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589f7d1e4f
Add min/max key length fields to the MAC algorithm description and validate configured keys before they are used.
114 lines
2.3 KiB
C
114 lines
2.3 KiB
C
/*
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* BIRD -- Password handling
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*
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* (c) 1999 Pavel Machek <pavel@ucw.cz>
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* (c) 2004 Ondrej Filip <feela@network.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#include "nest/bird.h"
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#include "nest/password.h"
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#include "conf/conf.h"
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#include "lib/string.h"
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#include "lib/timer.h"
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#include "lib/mac.h"
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struct password_item *last_password_item = NULL;
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struct password_item *
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password_find(list *l, int first_fit)
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{
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struct password_item *pi;
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struct password_item *pf = NULL;
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btime now_ = current_real_time();
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if (l)
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{
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WALK_LIST(pi, *l)
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{
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if ((pi->genfrom < now_) && (pi->gento > now_))
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{
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if (first_fit)
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return pi;
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if (!pf || pf->genfrom < pi->genfrom)
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pf = pi;
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}
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}
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}
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return pf;
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}
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struct password_item *
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password_find_by_id(list *l, uint id)
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{
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struct password_item *pi;
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btime now_ = current_real_time();
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if (!l)
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return NULL;
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WALK_LIST(pi, *l)
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if ((pi->id == id) && (pi->accfrom <= now_) && (now_ < pi->accto))
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return pi;
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return NULL;
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}
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struct password_item *
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password_find_by_value(list *l, char *pass, uint size)
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{
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struct password_item *pi;
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btime now_ = current_real_time();
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if (!l)
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return NULL;
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WALK_LIST(pi, *l)
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if (password_verify(pi, pass, size) && (pi->accfrom <= now_) && (now_ < pi->accto))
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return pi;
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return NULL;
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}
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uint
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max_mac_length(list *l)
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{
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struct password_item *pi;
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uint val = 0;
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if (!l)
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return 0;
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WALK_LIST(pi, *l)
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val = MAX(val, mac_type_length(pi->alg));
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return val;
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}
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/**
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* password_validate_length - enforce key length restrictions
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* @pi: Password item
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*
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* This is a common MAC algorithm validation function that will enforce that the
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* key length constrains specified in the MAC type table.
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*/
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void
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password_validate_length(const struct password_item *pi)
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{
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if (!pi->alg)
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return;
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const struct mac_desc *alg = &mac_table[pi->alg];
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if (alg->min_key_length && (pi->length < alg->min_key_length))
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cf_error("Key length (%u B) below minimum length of %u B for %s",
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pi->length, alg->min_key_length, alg->name);
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if (alg->max_key_length && (pi->length > alg->max_key_length))
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cf_error("Key length (%u B) exceeds maximum length of %u B for %s",
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pi->length, alg->max_key_length, alg->name);
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}
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