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Replace isMD5() with a more future-proof way to check if pw is encrypted.

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The rule is that if pg_authid.rolpassword begins with "md5" and has the
right length, it's an MD5 hash, otherwise it's a plaintext password. The
idiom has been to use isMD5() to check for that, but that gets awkward,
when we add new kinds of verifiers, like the verifiers for SCRAM
authentication in the pending SCRAM patch set. Replace isMD5() with a new
get_password_type() function, so that when new verifier types are added, we
don't need to remember to modify every place that currently calls isMD5(),
to also recognize the new kinds of verifiers.

Also, use the new plain_crypt_verify function in passwordcheck, so that it
doesn't need to know about MD5, or in the future, about other kinds of
hashes or password verifiers.

Reviewed by Michael Paquier and Peter Eisentraut.

Discussion: https://www.postgresql.org/message-id/2d07165c-1793-e243-a2a9-e45b624c7580@iki.fi
This commit is contained in:
Heikki Linnakangas
2017-02-01 13:11:37 +02:00
parent 7ac4a389a7
commit dbd69118c0
6 changed files with 219 additions and 158 deletions
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4
src/include/common/md5.h
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@@ -18,10 +18,6 @@
#define MD5_PASSWD_LEN 35
#define isMD5(passwd) (strncmp(passwd, "md5", 3) == 0 && \
strlen(passwd) == MD5_PASSWD_LEN)
extern bool pg_md5_hash(const void *buff, size_t len, char *hexsum);
extern bool pg_md5_binary(const void *buff, size_t len, void *outbuf);
extern bool pg_md5_encrypt(const char *passwd, const char *salt,