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credential: new attribute password_expiry_utc
Some passwords have an expiry date known at generation. This may be years away for a personal access token or hours for an OAuth access token. When multiple credential helpers are configured, `credential fill` tries each helper in turn until it has a username and password, returning early. If Git authentication succeeds, `credential approve` stores the successful credential in all helpers. If authentication fails, `credential reject` erases matching credentials in all helpers. Helpers implement corresponding operations: get, store, erase. The credential protocol has no expiry attribute, so helpers cannot store expiry information. Even if a helper returned an improvised expiry attribute, git credential discards unrecognised attributes between operations and between helpers. This is a particular issue when a storage helper and a credential-generating helper are configured together: [credential] helper = storage # eg. cache or osxkeychain helper = generate # eg. oauth `credential approve` stores the generated credential in both helpers without expiry information. Later `credential fill` may return an expired credential from storage. There is no workaround, no matter how clever the second helper. The user sees authentication fail (a retry will succeed). Introduce a password expiry attribute. In `credential fill`, ignore expired passwords and continue to query subsequent helpers. In the example above, `credential fill` ignores the expired password and a fresh credential is generated. If authentication succeeds, `credential approve` replaces the expired password in storage. If authentication fails, the expired credential is erased by `credential reject`. It is unnecessary but harmless for storage helpers to self prune expired credentials. Add support for the new attribute to credential-cache. Eventually, I hope to see support in other popular storage helpers. Example usage in a credential-generating helper https://github.com/hickford/git-credential-oauth/pull/16 Signed-off-by: M Hickford <mirth.hickford@gmail.com> Reviewed-by: Calvin Wan <calvinwan@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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@ -144,6 +144,12 @@ Git understands the following attributes:
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The credential's password, if we are asking it to be stored.
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`password_expiry_utc`::
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Generated passwords such as an OAuth access token may have an expiry date.
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When reading credentials from helpers, `git credential fill` ignores expired
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passwords. Represented as Unix time UTC, seconds since 1970.
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`url`::
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When this special attribute is read by `git credential`, the
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@ -167,7 +167,7 @@ helper::
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If there are multiple instances of the `credential.helper` configuration
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variable, each helper will be tried in turn, and may provide a username,
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password, or nothing. Once Git has acquired both a username and a
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password, no more helpers will be tried.
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non-expired password, no more helpers will be tried.
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+
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If `credential.helper` is configured to the empty string, this resets
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the helper list to empty (so you may override a helper set by a
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@ -127,6 +127,9 @@ static void serve_one_client(FILE *in, FILE *out)
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if (e) {
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fprintf(out, "username=%s\n", e->item.username);
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fprintf(out, "password=%s\n", e->item.password);
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if (e->item.password_expiry_utc != TIME_MAX)
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fprintf(out, "password_expiry_utc=%"PRItime"\n",
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e->item.password_expiry_utc);
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}
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}
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else if (!strcmp(action.buf, "exit")) {
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20
credential.c
20
credential.c
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@ -7,6 +7,7 @@
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#include "prompt.h"
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#include "sigchain.h"
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#include "urlmatch.h"
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#include "git-compat-util.h"
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void credential_init(struct credential *c)
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{
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@ -234,6 +235,11 @@ int credential_read(struct credential *c, FILE *fp)
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} else if (!strcmp(key, "path")) {
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free(c->path);
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c->path = xstrdup(value);
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} else if (!strcmp(key, "password_expiry_utc")) {
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errno = 0;
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c->password_expiry_utc = parse_timestamp(value, NULL, 10);
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if (c->password_expiry_utc == 0 || errno == ERANGE)
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c->password_expiry_utc = TIME_MAX;
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} else if (!strcmp(key, "url")) {
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credential_from_url(c, value);
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} else if (!strcmp(key, "quit")) {
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@ -269,6 +275,11 @@ void credential_write(const struct credential *c, FILE *fp)
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credential_write_item(fp, "path", c->path, 0);
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credential_write_item(fp, "username", c->username, 0);
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credential_write_item(fp, "password", c->password, 0);
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if (c->password_expiry_utc != TIME_MAX) {
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char *s = xstrfmt("%"PRItime, c->password_expiry_utc);
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credential_write_item(fp, "password_expiry_utc", s, 0);
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free(s);
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}
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}
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static int run_credential_helper(struct credential *c,
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@ -342,6 +353,12 @@ void credential_fill(struct credential *c)
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for (i = 0; i < c->helpers.nr; i++) {
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credential_do(c, c->helpers.items[i].string, "get");
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if (c->password_expiry_utc < time(NULL)) {
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/* Discard expired password */
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FREE_AND_NULL(c->password);
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/* Reset expiry to maintain consistency */
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c->password_expiry_utc = TIME_MAX;
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}
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if (c->username && c->password)
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return;
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if (c->quit)
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@ -360,7 +377,7 @@ void credential_approve(struct credential *c)
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if (c->approved)
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return;
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if (!c->username || !c->password)
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if (!c->username || !c->password || c->password_expiry_utc < time(NULL))
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return;
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credential_apply_config(c);
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@ -381,6 +398,7 @@ void credential_reject(struct credential *c)
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FREE_AND_NULL(c->username);
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FREE_AND_NULL(c->password);
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c->password_expiry_utc = TIME_MAX;
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c->approved = 0;
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}
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@ -126,10 +126,12 @@ struct credential {
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char *protocol;
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char *host;
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char *path;
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timestamp_t password_expiry_utc;
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};
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#define CREDENTIAL_INIT { \
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.helpers = STRING_LIST_INIT_DUP, \
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.password_expiry_utc = TIME_MAX, \
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}
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/* Initialize a credential structure, setting all fields to empty. */
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@ -35,6 +35,16 @@ test_expect_success 'setup helper scripts' '
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test -z "$pass" || echo password=$pass
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EOF
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write_script git-credential-verbatim-with-expiry <<-\EOF &&
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user=$1; shift
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pass=$1; shift
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pexpiry=$1; shift
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. ./dump
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test -z "$user" || echo username=$user
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test -z "$pass" || echo password=$pass
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test -z "$pexpiry" || echo password_expiry_utc=$pexpiry
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EOF
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PATH="$PWD:$PATH"
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'
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@ -109,6 +119,43 @@ test_expect_success 'credential_fill continues through partial response' '
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EOF
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'
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test_expect_success 'credential_fill populates password_expiry_utc' '
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check fill "verbatim-with-expiry one two 9999999999" <<-\EOF
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protocol=http
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host=example.com
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--
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protocol=http
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host=example.com
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username=one
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password=two
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password_expiry_utc=9999999999
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--
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verbatim-with-expiry: get
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verbatim-with-expiry: protocol=http
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verbatim-with-expiry: host=example.com
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EOF
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'
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test_expect_success 'credential_fill ignores expired password' '
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check fill "verbatim-with-expiry one two 5" "verbatim three four" <<-\EOF
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protocol=http
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host=example.com
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--
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protocol=http
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host=example.com
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username=three
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password=four
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--
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verbatim-with-expiry: get
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verbatim-with-expiry: protocol=http
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verbatim-with-expiry: host=example.com
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verbatim: get
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verbatim: protocol=http
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verbatim: host=example.com
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verbatim: username=one
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EOF
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'
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test_expect_success 'credential_fill passes along metadata' '
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check fill "verbatim one two" <<-\EOF
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protocol=ftp
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@ -149,6 +196,24 @@ test_expect_success 'credential_approve calls all helpers' '
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EOF
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'
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test_expect_success 'credential_approve stores password expiry' '
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check approve useless <<-\EOF
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protocol=http
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host=example.com
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username=foo
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password=bar
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password_expiry_utc=9999999999
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--
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--
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useless: store
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useless: protocol=http
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useless: host=example.com
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useless: username=foo
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useless: password=bar
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useless: password_expiry_utc=9999999999
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EOF
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'
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test_expect_success 'do not bother storing password-less credential' '
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check approve useless <<-\EOF
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protocol=http
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@ -159,6 +224,17 @@ test_expect_success 'do not bother storing password-less credential' '
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EOF
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'
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test_expect_success 'credential_approve does not store expired password' '
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check approve useless <<-\EOF
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protocol=http
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host=example.com
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username=foo
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password=bar
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password_expiry_utc=5
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--
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--
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EOF
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'
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test_expect_success 'credential_reject calls all helpers' '
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check reject useless "verbatim one two" <<-\EOF
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@ -181,6 +257,24 @@ test_expect_success 'credential_reject calls all helpers' '
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EOF
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'
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test_expect_success 'credential_reject erases credential regardless of expiry' '
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check reject useless <<-\EOF
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protocol=http
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host=example.com
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username=foo
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password=bar
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password_expiry_utc=5
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--
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--
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useless: erase
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useless: protocol=http
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useless: host=example.com
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useless: username=foo
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useless: password=bar
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useless: password_expiry_utc=5
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EOF
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'
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test_expect_success 'usernames can be preserved' '
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check fill "verbatim \"\" three" <<-\EOF
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protocol=http
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